DE2422542A1 - METAL-CERAMIC-SINTERED MATERIAL - Google Patents

Description

TiC is a hard compound with a melting point at 3250 ° C, a Vickers hardness of 3200 kg / mm ² and a specific weight τοη 4 * 9 « It is excellent in its abrasion resistance, its heat resistance, its mechanical strength and in its sinterability Metals of the iron family, but lacking resistance to seizing and initial fitting properties

In contrast, TiN, which has a melting point of 2940 ° C., a Vickers hardness of 1950 kg / mm ² and a specific gravity of 5.4, has excellent scuffing resistance, heat resistance and a low coefficient of friction. Compared to TiC , however, in terms of wear resistance, mechanical strength

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ke and inferior to sinterability with metals of the iron family. It is also known that the flexural strength of TiC-iron sintered material is generally in the range between 120-170 kg / mm, while the flexural strength of TiN-iron sintered material is in the range of 30-80 kg / mm ² .

Because of its strong tendency to eat and wear and tear TiC iron sintered material meets abnormal wear and tear under high loads does not meet the requirements of a material for seals in internal combustion engines of motor vehicles and for car mold steel. LiG sintered material, on the other hand, does not meet the requirements placed on a wear-reducing material for the various sliding parts in piston engines, for various seals in rotating engines and for various bearings in gas turbines because it is at high operating loads shows abnormal wear or seizes. A TiN-sintered off shows no pressing and no abnormal. Wear and tear, but its insufficient mechanical strength often leads to defects in the product made from it.

The object of the invention is to provide a hard-sintered metal-ceramic material to create that has an extremely low tendency to seizure, high wear resistance and a has great mechanical strength and is used as a material for automotive parts such as bearings in gas turbines, seals in

Rotary piston engines and sliding seals in piston engines suitable for racing cars.

This object is achieved according to the invention by a first, hard, pulTer-shaped part, which consists essentially of TiC and TiN with 10 - 70 wt. -96 TiN and the one with at least one powdered metal from the group Pe, Ni, Go, Cr, Ko and Mn is sintered.

A method for producing such a metal-ceramic sintered material is characterized in that a first, powdery portion, which essentially consists of TiC and TiN with 10 - 70 wt .-% TiN, with at least one powdery Metal from the group Pe, Ni, Co, Cr, Mo and Mn is mixed in a liquid which is not one of the powders mentioned binds that this mixture is dried, then shaped, and thereafter in vacuum or in an inert or inert atmosphere reducing gas is heated to a temperature above the melting point of the metal powder and held for so long until the sintering process has taken place.

Further advantages and features of the invention emerge from the claims, which are set out below on the basis of an exemplary embodiment and is described in more detail in connection with the drawing. Show it:

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Fig. 1 is a graph showing the relationship between the relative percentage of TiC and 3? ± N on the one hand and the abrasion of the sintered material on the other hand

shows,

Fig. 2 shows the relationship between the TiC-TiN ratio (%) and the flexural strength of the Sinterver i; - r,

3 shows the relationship between the total weight fraction of TiC and TiN, which are present in equal proportions, to the abrasion of the sintered material,

Fig. 4 shows the ratio between the total weight fraction of TiC and TiH, which in equal proportions are included, and the bending strength of the sintered material and

5 shows a micrograph of a metal-ceramic sintered material according to the invention .

The low tendency to seize, which reduces abrasion or wear Properties and the mechanical strength of a TiC-TiN sintered material meet the requirements of Parts are provided which are installed in motor vehicles. To prepare them, a solid solution is used first made of TiC and TiN, its greatly reduced or very low tendency to seizure, its abrasion-reducing Properties and their mechanical properties correspond to the requirements that are placed on car parts. These

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Mixture is then sintered with one or more metals from the iron family, i.e. with one or more metals from the group Pe, Ni, Go, Gr, Mo and Ma. Both TiC and TiN easily form a solid solution. Instead of a solid solution or a mixed crystal, a mixture can also be used in this pail · If special emphasis is placed on the low tendency to press, the total amount of TiC and TiN can contain 70% TiN. More than 70 % TiN is not desirable because it significantly reduces the mechanical strength of the product, as can be seen from Pig. 2 sees. A TiN content of less than 10 % of the total TiC-TiN amount is also undesirable, because such a low proportion, as can be seen from Pig. 1 does not improve the resistance to pressing. If special emphasis is placed on the low tendency to press and on the abrasion-reducing properties, but if the mechanical properties are not to be sacrificed, a proportion of 40 % TlS to 40 % Ti 1 is recommended.

The low tendency for pressing and abriebvermindernden properties of a metal-ceramic material depend substantially upon the amounts and proportions of the diffused therein TiG and TiN from _e Therefore, the sintered metal should be selected so that the required mechanical strength, heat resistance, corrosion resistance and workability The preferred proportion of the hard compound of TiN and TiG is 15 to 80 % of the total weight of the

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Metal-ceramic material. If this proportion of the hard joint is less than 15 % , the low tendency to compression and the abrasion-reducing properties of the KetalMEeramifr material drop hard, as shown in Pig · 5. However, if this proportion exceeds 80> ί, the mechanical strength is greatly reduced, as shown in Fig. 4, and the metal-ceramic material is no longer suitable for the manufacture of automobile parts.

The metal-ceramic material according to the invention is produced by mixing a powdery hard compound of! DiG and TIS and a powdery sintered metal together with a fluid such as acetone or hexane, which does not combine with these metals. The mixture is then dried, shaped and sintered. In the first step, measured fillings of the mentioned powders are moistened

mixes, dried and under a pressure of over 500 kg / cm molded at room temperature; then this molded mixture is placed in a vacuum, in an atmosphere of argon, nitrogen or helium or in a reducing atmosphere of hydrogen or carbon monoxide to an emperafcir above the melting point of the sintered metal is heated and held until the sintering process has taken place. The powder mix can also be placed in a porm and then under pressure of more than 50 kg / cm can be sintered at the above-mentioned temperature. Other sintering processes can also be used.

be used, e.g. hot extrusion. In the manufacturing process, it should be noted that the hard connection -and the sintered metal for a certain time in one wear or reducing grass atmosphere or in a vacuum at a temperature above the melting point of the sintered metal must be kept.

The sintering should expediently take place in an atmosphere with a nitrogen partial pressure, so that a Decomposition of the TiIi is prevented.

In the production of metal-ceramic material according to the invention powders with a grain size of less than 5 / U are used, which is normally the grain size of the Manufacturing hard alloys is.

A few exemplary embodiments will now be described, the indication % in each case referring to percentages by weight.

example 1

An amount of powder, which 40 % of a solid solution (mean particle size 1.5 / u) of TiC and TiN in a ratio of 50:50, which also 54 # Ni (mean particle size 3 / u) and which 6 % Mo (mean particle size 5 / u), together with acetone for 24 hours in a ball

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- 8 mill mixed, then dried and finally un-

molded under a pressure of 2500 kg / cm at room temperature. The molded product was then heated at a temperature of 1,420 ° C. for one hour in a nitrogen gas atmosphere and sintered. A sample measuring 4 × 8 × 25 mm was cut out of the sintered product. This sample was then subjected to a bending test over a span of 20 mm, which gave the value 139 kg / mm. The Vickers hardness was 724 kg / mm and the specific gravity was 7t16. The microstructure of the metal-ceramic material produced is in Pig. 1 shown.

Example 2

A powder amount with 50 % of a solid solution (mean particle size 1.5 / u) of TiC and TiN in a ratio of 50:50, with 45 So Ni (mean particle size 3 / u) and with 5 / ö Mo (mean particle size 5 / u) was mixed together with acetone in a ball mill for 24 hours, then

dried and then under a pressure of 2500 kg / cm Molded at room temperature. The molded product was left to sinter for one hour in a nitrogen gas atmosphere heated to a temperature of 1420 ° C. The sintered product showed

a flexural strength of 138 kg / mm, a Vickers hardness of 855

kg / mm and a specific weight of 6.74.

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Example 5

A powder amount with 60? Ό of a solid solution (mean particle size 1.5 / u) of TiC and TiN in a mixing ratio of 50:50, with 36 % Ni (mean particle size 3 / u ") and with 4 / J Ko (mean Particle size 5 / u) was mixed, dried and shaped as in Example 2 - The shaped product was heated to a temperature of 1450 ° C. for one hour for sintering in a nitrogen gas atmosphere.

The sintered product had a bending strength of 126 kg / mm,

a Vickers hardness of 956 kg / mm and a specific gravity of 6.45.

Example 4

A powder amount with 70 % of a solid solution (mean particle size 1.5 / u) of TiU and TiM in a ratio of 50:50, with 27 % Hi (mean particle size 3 / u) and with 3 % Mo, (mean particle size 5 / u) was mixed together with hexane for about 24 hours in a ball mill, then dried and

then under a pressure of 2000 kg / cm at room temperature shaped. The molded product was sintered in a vacuum of 10 "* mm" Hg for one hour at a temperature heated by 1450 ° G. The sintered material showed a bending

p ρ

strength of 105 kg / mm, a Vickers hardness of 1008 kg / mm ~ and a specific gravity of 6.01.

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Example 5

A powder mixture with a proportion of 80 % of a solid solution (mean particle size 1.5 / u) of IiC and TiN in a ratio of 50:50, with 18 % Ni, (mean particle size 3 / u) and with 2 % Mo (mean particle size 5 / u) was mixed as in Example 4, dried and then molded at room temperature under a pressure of 1500 kg / cm.

_p The molded product was in a vacuum of 10 mm Hg

heated to 1450 ° G for one hour and sintered. The sintered product had a bending strength of 91 kg / mm, a Vickere hardness of 1240 kg / mm and a specific weight of 5 »64.

Example 6

A powder amount with 40 % TiC (mean particle size 2 / u), with 40 % ! EiN (mean particle size 3 / u), with 18 % Ni (mean particle size 3 / u) and with 2 ⁰ A Mo (mean particle size 5 / u) ) was mixed, dried, shaped and sintered as in Example 5. The sintered product had a flexural strength of 75 kg / mm, a Vickers hardness of 1050 kg / mm and a specific weight of 5.59.

Example 7

A powder amount with 25 % of a solid solution (mean particle size 1.5 / u) of TiC and TiN in the ratio 50:50, with 67.5 * Λ Ni (mean particle size 3 / u) and with 7.5 % Mo

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(mean particle size 5 / u) was combined with acetone 24 Mixed for hours in a ball mill, then dried and then molded under a pressure of 2500 kg / cm at skin temperature. The molded product was subjected to sintering for one hour in a nitrogen gas atmosphere Heated to a temperature of 1400 ° C. The sintered product had a

2

Bending strength of 140 kg / mm, a Vickers hardness of 580 kg / mm

and a specific gravity of 7.61.

Example 8

A powder mix Sd. t 15 % .. of a solid solution (mean particle size 1.5 / u) of TiC and TiIT in a ratio of 50:50, with 76.5 % Ni (mean particle size 3 / u) and with 8.5 ti Mo (mean particle size 5 / u) was mixed, dried, shaped and sintered as in Example 7 .. The sintered product had a flexural strength of 123 kg / mm, a Vickers hardness of 415 kg / mm and a specific weight of 7.99 ·

Example 9

An amount of powder with a proportion of tyO % of a solid solution (mean particle size 1.5 / u) of TiC and TiN in the ratio 50; 5O, with 5.9 % Co (mean particle size 1 / u), with 5.3 % Ni (mean particle size 3 / u), with 3.3 % Mo (mean particle size 5 / u), with 0.8% Mn in the form of manganese iron with a mesh size of up to 325 mesh and with the difference "

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(mean particle size 5 / u) was combined with acetone 24 Mixed in a ball mill for hours, then dried and then molded under a pressure of 2500 kg / cm at room temperature. The shaped event was used for sintering for one hour in a nitrogen gas atmosphere heated to a temperature clay 1380 ° C. The sintered product had a bending strength of 148 kg / mm, a Vickers hardness

of 859 kg / mm and a specific weight of 6.68.

Example 10

A powder mixture with a proportion of 40 % from a solid solution (mean particle size 1.5 / u) of TiC and TiN in the ratio 50:50, with 15 % Fe (mean particle size 5 / u) and with 45 % Oo (mean particle size 1 / u) was mixed, dried and shaped as in Example 9 and then heated to 1400 ° C. for one hour in a nitrogen gas atmosphere for sintering. The sintered product had a

2 2

strength of 170 kg / mm, a Vickers hardness of 502 kg / mrc *

and a specific gravity of 6.89.

Example 11

A powder mixture with a proportion of 40 % ₉ consisting of a solid solution (mean particle size 1.5 / u), of TiG and TiK in a ratio of 50:50, with 6.4 % Cr in the form of chrome iron with a mesh size of up to 325 mesh , with 1.8 % Mo (mean particle size 5 / u), with 0.2 % Hi (mean particle size

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with 0.3 5ό graphite (mean particle size 5 / U.) and with the remainder, consisting of Fe (mean particle size 5 / u) eie in Example 9 was mixed, dried, shaped and then for sintering for one hour in a nitrogen gas atmosphere to a temperature of 1400 ° G

warms. The sintered product had a bending strength of 140 kg / mm,

a Vickers hardness of 815 kg / mm and a specific weight from 6.52.

This sintered product was opened for another hour Heated to 950 ° C, then quenched in oil and then tempered for one hour at a temperature of 430 ° C. This Quenching and tempering resulted in the following

p p

tion: bending strength - 140 kg / mm and Vickers hardness - 923 kg / mm.

Example 12

A powder mixture with a proportion of 40 % ₉ consisting of a solid solution (mean particle size 1.5 / u), of TiG and TiN in a ratio of 50:50, with 11.8 % Cr in the form of chrome iron with a mesh size of up to -325 mesh, with 5.3 % Ni (mean particle size 3 / u), with 1.2 % Mo (mean particle size 5vu) and with the remainder consisting of Pe (mean particle size 5 / u) was mixed as in Example 9, dried and shaped; the molded product was then made into

_- p

in a vacuum of 10 mm Hg for one hour to one Heated to a temperature of 1400 ° C. The sintered product had one

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ρ ρ

Bending strength of 135 kg / mm, a Vickers hardness of 640 kg / mm and a specific gravity of 6.41.

Example 13

A powder mixture with 40 % of a solid solution (mean particle size 1.5 / u) of TiC and TiN in a ratio of 50:50, with 7.5 % Mn in the form of manganese particles with a mesh size of up to 325 mesh, with 0.75 % Graphite (mean particle size 5 / u) and with the remainder Pe (mean particle size 5 / u) was mixed as in Example 9, dried and then

molded under a pressure of 1500 kg / cm at room temperature. The molded product was sintered for one hour in a vacuum of 10 "mm Hg at a temperature of 1400 ^° G

heated · The sintered product had a flexural strength of 101

2 2

kg / mm, a Vickers hardness of 1027 kg / mm and a specific gravity of 6.30.

Example 14

A powder mixture with 12 % TiC (mean particle size 2 / u), with 28 % TiN (mean particle size 3 / u), with 54 % Ni (mean particle size 5 / u) and with 6 % Mo (mean particle size 5 / u) was mixed together with acetone in a ball mill for 24 hours, dried and then molded under a pressure of 2000 kg / cm at room temperature. The molded product was sintered in

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a nitrogen gas atmosphere heated to 1450 ° C. The sin-

product had a bending strength of 84 kg / mm, a Viekers

Hardness of 610 kg / mm and a specific weight of 7.01.

Example 15

A powder mixture with 40 ft of a solid solution (mean particle size 5 / u) of TiC and TiN in the ratio 30:70, with 6.9 ~ A Cr in the form of chrome iron with a mesh size up to 325 mesh, with 1 % Mo (mean particle size 5 / u), with 4.2% Co. (mean particle size 1 / u) and with the remainder Pe (mean particle size 5 / u) were mixed, dried and shaped as in Example 14, and then for one hour for sintering in a nitrogen gas atmosphere brought to a temperature of 1420 ° C for a long time. The sintered product had a

p - p

strength of 96 kg / mm, a Vickers hardness of -683 kg / mm and a specific gravity of 6.50.

Example 16

A powder mixture with 16 % TiC (mean particle size 2 / u), with 2H% TiN (mean particle size 3 / u), with 54 % Ni (mean particle size 3 / u) and 6% Mo (mean particle size 5 / u) was win in example 14, acrmiaSit, dried, shaped and sintered «The sintered product had a flexural strength of 100 kg /

ρ ρ

mm, a Vickers hardness of 615 kg / mm and a specific gravity of 7.06.

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Example 17

A powder mixture with 40 % of a solid solution (mean particle size 5 / u) of TiC and TiN in the ratio 40:60, with 6.9 % Cr in the form of chrome iron with a mesh size of up to 325 mesh, with 1.0 % Mo (mean Particle size 5 / u), with 4.2 % Co (mean particle size 1 / u) and with the remainder of Pe (mean particle size 5 / u) was mixed, dried and shaped as in Example 14 and then sintered for one hour in heated to a temperature of 1420 ° C in a nitrogen gas atmosphere. The sintered product had a flexural strength of 122 kg / mm, a Vickers hardness of 725 kg / mm ^ and a specific gravity of 6.47.

Example 18

A powder mixture with 24 % TiC (mean particle size 2, u), with 16 ιό TiIT (mean particle size 3 / u), with 54 % ITi (mean particle size 3 / u) and with 6 % Mo (mean particle size 5 / u) was mixed, dried and shaped as in Example 14 and then heated to 1420 ° C. for one hour for sintering in a nitrogen gas atmosphere. The sinter

product had a bending strength of 119 kg / mm, a Vickers

Hardness of 623 kg / mm and a specific weight of 6.98 _e

Example 19

l! ine powder mixture with 40 % of a solid solution (mean particle size 2 / u) of TiC and TiN in the ratio 60:40, with

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6,9 -j Or in the form of chrome iron with a mesh size of up to 325 mesh, with 1.0 % Mo (mean particle size 5 / u), with 4 _t 2 % Co (mean particle size 1 / u) and with the remainder of Pe (mean particle size 5 / u) was we? mixed in Example 14, dried and shaped and then heated to a temperature of 1420 ° C. for one hour in a nitrogen gas atmosphere for jintering. The sintered product

had a bending strength of 129 kg / mm, a Vickers hardness

2 of 730 kg / mm and a specific weight of 6.44.

Example 20

Mixture with 28 % TiC (mean particle size 2 / u), with 12 '/ ό TiN (mean particle size 3 / u), with 54 ft Ni (mean particle size 3 / u) and 6 j * Ko (mean particle size 5 / u ) was mixed, dried and shaped as in Example 14 and then heated ^{to a temperature of 142U 0 C for one hour in a vacuum of IU mm Hg for sintering.} The sin-

product had a flexural strength of 108kg / mm, a Vickers

hardness of 703 kg / mm and a specific weight of 7 _tons .

Example 21

A powder mixture with 40? J of a solid solution (mean particle size 2 / u) of TiC and TiN in the ratio 80:20, with β, 9 -ό Or in the form of chrome iron with a mesh size of up to 325 mesh, with 1.0 % Ko (mean particle size 5 / u), with 4.2 %

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Oo (mean particle size 1, u) and riding dec remaining Part of J? E (mean particle size 5 / u) became like ic: example 14 mixed, dried and shaped and then used for

_p

Sinter for one hour in a vacuum of 1G am Hg heated to a temperature of 14CO C. The Dinterproduct

I had a flexural strength of 127 kg / mm, a Vickers hardness of 751 kg / mm and a specific weight of 6.42.

Example 22

A powder mixture with 36 η TiG (mean rope size 2 / u), with 4 % TiN (mean particle size 3 / u), with 54> S Ni (mean particle size 3 / u) and with 6> a Ko (mean particle size 5 / u ) was mixed as in example 20, dried,

molded and sintered. The sintered product had a bending

2 2

strength of 110 kg / mm, a Vickers hardness of 760 kg / mm and a specific gravity of 7.01.

The sintered materials produced according to Examples 1 to 22 were tested for their wear resistance and their tendency for feeding and for strength, and the results of these tests are summarized in Table 1. The following materials were used for comparison in these studies:

Cr - Mo steel (SCJK 40 tempered); TiC-Ketall-Ceramic-Material (55 TiC-40 Ni-50r); TiC-Ketall-Ceramic-Material fr., 5 TiC-2Cr-2Ko-rest Pe; Trade name: "Ferrotic-C); and TiN-Metall-Kera-

aik-Werketoff (60 Ϊ1Ν-40 Co).

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Tabel

.το co c »cn ο

-j σ> cn

Example Ivr. riC / Tii;
Relationship
nis TiC Size Bending
strong Hardness ^ Press Abriet
(well) number 1 50/50 40 7.16 139 724 Well 0.62 etall it 2 Il 50 6.74 138 855 Il 0.60 φ "3 Il 60 6.45 126 956 It . 0.54 H;
I. .ι 4 It 70 6.01 105 1008 It 0.55 discern ti 5 ti 80 5.64 91 1240 ! I 0.51 O
H ₃
H
Φ "6 Il 80 5.59 75 1080 It 0.53 Φ
f η γ ti 25th 7.61 140 580 It 0.35 P.
Φ
H
ir
H
K
H-
ρ-
G " 8th Il 15th 7.99 123 415 pretty much
good ■ 1.41
Wi • ι 9 Il 40 6.68 148 PfT ₉ Well 0.63 "10 ti 40 6.89 170 502 Il 0.95

Γ "
P.
H
L ₁₁ J
H ·
r ■
H;
O)
It
et Table 1 continued TiC / TiN
Relationship
nis TiC Specific
weight Bending
strength Hardness 2
(kg / ram) resistance
against
Press Abrasion
. (mm) O
1-4,
cn
Λ
H Example Mr.
)
1 50/50 40 6.52 140 815 Well 0.71 Hj
H-
Ö
ι. He. 11 Il Il 6.41 135 640 It 0.62 "12 It Il 6.30 101 1027 It 0.51 "13 30/70 ti 7.01
I. 84 610 out ·,
outstanding 0.73 ¹¹ 14 Il It 6.50 96 683 ti 0.68 CD
CO "15 40/60 If 7.06 100 615 Well 0.82 850/076 "16 It It 6.47 122 725 Il 0.7ö cn > ι ₁₇ 60/40 M. 6.98 119 623 Il 0.72 • ^: 18 It dd 6.44 129 730 Il 0.68 "19th 70/30 ti 7.00 108 703 t! 1.05 “£ 0 80/20 Il 6.42 127 '751 emerged
outstanding. 1.49 η 21 90/10 ^! « 7.01 110 760 Il 2.58 "22
!

Port setting Table 1

CD OO j cn ο *

i Example Kr. TiG / TiN
Relationship
nis TiG
+ TiN (> ό) SCM40 remunerated Specific
weight Bend
strength 2
(kg / mm) Hardness ₂
(kg / mm) resistance
against
Press Abrasion CO
J Ci
H
Q
H-
O
fcv
Cn
! ^;1
el
(T.
H
H-
ti.
H-
i TiO-Ketall-Ceramic-Material
55 iiG-4üNi-5Go 7.87 120 350 small amount
(eaten) not
measurable TiC metal ceramic material
¹¹ ierrotio-C " 6.37 126 845 small amount
(stronger
Abrasion) 7.51 'JJiN-Ketall-Ceramic-Material
6ü TiN-400o 6.62 178 1020 small amount
(eaten) not
measurable 6.71 - 62 565 nerve) r-
outstanding 0.63

σι cn

K)

N) K) cn K)

Examples 25-26

In these examples, there were Ti0 / TiN hybrids with mixing ratios used in the invention and the same experiments and procedures as in the previous examples are used, unless otherwise noted. The results are in the tables 2 and 3 combined.

Examples 25 and 24

Me sintering was carried out by heating to 1400 ° C for one hour in a nitrogen atmosphere.

Examples 25-28

The sintering was carried out by heating to 1400 ° C for one hour in a vacuum of 10 ~ mm Hg "

Examples 29 and 30

The sintering was followed by a one-hour heating a temperature of 1450 ° G in a vacuum of 10 ~ mm Hg carried out.

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Tabel

CD CO ΟΊ O

Example Kr. TiQ / TiN
Relationship
nis TiO
+ TiN ( ¹ JO) Specific
weight Bend
strength-
(Kg / ΠΜ ^) Hardness -
(kg / nnr) resistance
against
Press 11 Abrasion
(mm) 23 40/60 30th 7.33 121 620 Well 0.78 24 60/40 30th 7.31 129 631 η 0.81 25th 40/60 50 6.75 138 796 it 0.61 26th 60/40 50 6.74 142 B25 ti 0.64 27 40/60 60 6.46 130 913 ti 0.58 23 60/40 60 ■ 6.42 128 935 H 0.52 29 40/60 70 6.04 ■ 100 997 tr 0.53 30th 60/40 70 6.00 103 1002 0.52
1

Note »The UiO / HN mixture is a solid solution in every pail, the binding agent Ni-IO> j Mo and the molding pressure is 2000 kg / cm

Tabel

CD CD OO

! Example! No, IDiG / 'JJÜK TiC
Ratio-V 'IiN (J *)
nis Ν. 30th Specific
Weight Bend
strength
(kg / nim ^) Marie
(kg / mm ² ) resistance
against
Press Abrasion
(mm) 31 30/70 (fixed
Solution) 30th 7.59 78 504 Well 0.77 32 70/30 («) 30th 7.48 101 665 ti 1.17 33 90/10 (Wed
schung) 70 7.40 98 690 quite
Well '3.02 34 30/70 (fixed
Solution) 70 6.06 60 985 emerged
outstanding Θ, 60 35 70/30 (fixed
Solution) 70 5.98 82 990 Well 0.S9 36 90/10 (Wed
schung) 5.61 79 1013 quite
Well 2.9o

Note: Examples 31-33s forming pressure 2500 kg / cm

"34-36:" 2000 "

"31-33 ' sintering time one hour, heating to 14CO ⁰ O in a nitrogen atmosphere

"34: sintering time one hour, heating in a nitrogen atmosphere to 145O ⁰ C ■ _ ₂

ti 35-36: sintering time one hour, heating in a vacuum of 10 ~ mm Hg to 1450 ° E

A disk was used in the wear resistance test made of "FCG-23 hardened" (Tickers hardness 580 kg / mm) with a

Pressure tone 5 kg / mm pressed against the sample and rubbed in the process. After that, the disc for 60 minutes at one speed of 8 m / sec with simultaneous oil lubrication, the abrasion of the sample was measured.

In these investigations, the comparative materials, namely SCM 40 and two kinds of TiC metal-ceramic material, showed a tendency to galling or abnormal abrasion. The metal-ceramic materials however, according to the invention gave satisfactory results. They showed excellent Wear resistance.

Example 37

A powder mixture with 60 % of a solid solution (mean particle size 1.5 / u) of TiO and TiN in the ratio 50:50 and with 40 % Pe (mean particle size 5 / u) was mixed with n-hexane for 24 hours in a ball mill mixed, dried and then molded under a pressure of 2000 kg / cm at room temperature. The molded product was subjected to sintering

_p heated to 10 mm Hg in a vacuum for one hour. That

Sintered product had a bending strength of 68 kg / mm, one

2
Vickers hardness of 992 kg / iam and a specific weight

of 5.89.

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Example 58

A powder mixture with 60 % of a solid solution (mean particle size 1.5 / u) of TiG and TiN in the ratio 50:50 and of 40 % Ni (mean particle size 3 / u) was treated and shaped as in Example 37 and then for sintering

—2

heated to a temperature of 14-50 ° C for one hour in a vacuum of 10 mm Hg. The S.int er product had one Bending strength of 120 kg / mm, a Vickers force of 923 kg / mm and a specific gravity of 6.29

Example 39

A powder mixture with 60% of a solid solution (mean particle size of 1.5 / u) of TiC and TiN in a ratio of 50:50 and with 40 Yes Co (average particle size 1 / u) was treated as in Example 37, and molded. The molded product

-2 was heated to a temperature of 1430 ° C for one hour in a vacuum of 10 mm Hg. The sintered product has

2
te had a bending strength of 90 kg / mm, a Vickers hardness of 870 kg / mm, and a specific gravity of 6.13.

Example 40

A powder mixture with 60 Ya of a solid solution (mean particle size 1.5 / u) of TiC and TiN in a ratio of 50:50 and with 40 A Cr (mean particle size 1.2 to) was treated as in Example 37 and shaped. The molded product

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became a for sintering in a vacuum of 10 mm Hg Heated to a temperature of 1490 ° U for an hour. That

ο Sintered product had a bending strength of 39 kg / mm, one Vickers hardness of 840 kg / mm * "and a specific weight from 5.59.

Example 41

A powder mixture with 60 % of a solid solution (mean particle size 1.5 / u) of TiO and TiN in the ratio 50:50 and with 40 % Mo (mean particle size 5 / u) was treated and shaped as in Example 37 and then for sintering Heated to a temperature of 1550 ° G for one hour in a vacuum of 10 ~ mm Hg. The Sinterprodtfsfc had a Bie gestärke of 42 kg / mm, a Vickers hardness of 821 kg / mm and a specific gravity of 6.92 "

The sintered products of Examples 37 to 41 were examined for their wear resistance, their tendency to compress and their strength. The results are shown in the table.

409850/0765

Table 4

O CD OO cn ο

cn

Example no. TiC / TiN
Relationship
nis TiC Specific
weight Bend
strength _p
(kg / mnr) Hardness ₂
(kg / nm) resistance
against
Freesen Abrasion
(mm) 37 50/50 60 5.89 68 992 Well 0.68 38 Il Il 6.29 120 923 Il 0.61 39 ti Il 6.13 90 870 It 0.72 40 It ! I 5.59 39 840 quite
Well 1.01 41 H Il 6.92 42 821 did 0.62

CO

cn

Claims (10)

- 29 claims 1. Hard metal-xeramik material, characterized by a first, hard, powdery portion, which is essentially consists of TiC and TiN with 10-70% by weight of TiN and which is sintered with at least one powdery metal from the group Pe, Ni, Go, Cr, Mo and Mn. 2. Metal-ceramic material according to claim 1, characterized in that that the first powdery portion consists essentially of TiC and TiN. 3. Metal-ceramic material according to claim 1, characterized in that that the first powdery portion consists essentially of a solid solution of TiC and TiN. 4. metal-ceramic material according to claim 1, characterized in that that the particles of the powder have an average diameter of less than 5 / u. 5. Metal Ceramics V / erkstoff according to claim 1, characterized in that the first powdery AnteiH5 - 80 wt -.% By weight of the sintered metal-ceramic material. 6. Process for the production of metal-ceramic sintered materials according to claim 1, characterized in that a first, powdery portion, which is borrowed in the v / es from TiC 409850/0765 and TiN ordered with 10-70 wt .-> 5 TiN, with at least a powdered metal of the group Se, Mi, Co, Gr, Mo and Mn is mixed in a liquid which neither :: The said powder binds that this mixture is dried, then shaped and afterwards in a vacuum or in an atmosphere from inert or reducing gas to a temperature is heated above the melting point of the metal powder and held until the sintering process has taken place Has. 7. The method according to claim 6, characterized in that the mixture initially under a pressure of more than 500 kg / cm molded at room temperature and then heated until sintered. 8 «Method according to claim 6, characterized in that the Mixing simultaneously under a pressure of more than 5L kg / cm shaped and at a. Temperature above the melting point of the powdered metal is sintered. 9. The method according to claim 6, characterized in that the mixture is sintered by hot extrusion. 10. Sliding seal for Erennkraftmaschinen, characterized in that that they are made of a ketallic ceramic material after a of claims 1 to 5, 409850/0765