US2768427A - Permanently magnetisable alloys and the production thereof - Google Patents
Permanently magnetisable alloys and the production thereof Download PDFInfo
- Publication number
- US2768427A US2768427A US301611A US30161152A US2768427A US 2768427 A US2768427 A US 2768427A US 301611 A US301611 A US 301611A US 30161152 A US30161152 A US 30161152A US 2768427 A US2768427 A US 2768427A
- Authority
- US
- United States
- Prior art keywords
- alloys
- boron
- production
- iron
- aluminium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910045601 alloy Inorganic materials 0.000 title claims description 35
- 239000000956 alloy Substances 0.000 title claims description 35
- 238000004519 manufacturing process Methods 0.000 title description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 239000004411 aluminium Substances 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 239000012254 powdered material Substances 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 24
- 229910052796 boron Inorganic materials 0.000 description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 229910052759 nickel Inorganic materials 0.000 description 8
- 239000012535 impurity Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 239000010941 cobalt Substances 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910052715 tantalum Inorganic materials 0.000 description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/922—Static electricity metal bleed-off metallic stock
- Y10S428/9265—Special properties
- Y10S428/928—Magnetic property
Definitions
- the present invention relates to permanently magnetisable alloys and the production thereof. It is known to produce permanent. magnet alloys b United States Patent m t a combination of the alloying elements nickel, aluminium and iron. These alloys may also contain cobalt and in addition one or more of the elements copper, titanium, silicon, tantalum and columbium.
- Such alloys the properties of permanent magnetisatip n of which are produced by age-hardening mayhave contents of -40% nickel and 3 to 20% aluminium and where the said further elements are present, up to 40% cobalt, up to 20% copper, up to titanium, up to 3% silicon, up to 3% of zirconium and up to 5% of tantalum or columbium or up to 5% of the tantalum and columbium together, the remainder. being iron with the usual impurities, the proportions of the constituents of the alloy being so chosen where the optional elements are present that iron is present-up to at least 30%.
- the '30 term consisting essentially of from 5% to 40% of nickel,
- Alloys as aforesaid may be produced by mixing the metal constituents with. one another in powder form,
- the alloying elements may be incorporated in the powder in the form of initial alloys of two or more components of the final alloy.
- the production of the alloys by the sintering method generally guarantees the production of permanent magnetic properties corresponding to those of the alloys produced by the casting method, although there are exceptions to this rule.
- the content of boron should be kept within the limits of 0.01 to 0.15%, and remarkable fesults have been obtained, as is shown from the examples which appear hereinafter, when the boron is selected from within the narrow range of such low percentages as from .01 to .10%. These percentages are alculated on the total quantity of the materials present n the composi-
- the boron addition leads to an improvement in the permanent magnetic values in that the remanence values are higher in comparison with alloys without the boron 2,768,427 Patented Oct. 30, 1956 addition and the demagnetisation curve exhibits a more pronounced swelling, so that the energy product (BHm) is considerably increased.
- BHmax values riiay be obtained which are at least or even 50% or more higher than the BHmu values of such alloys without the boron addition.
- the alloy contains 12-18% nickel, 69% aluminium, 20 -35% cobalt, 2-6% copper, 0-8% titanium, 0.001-.15%I boron, and optionally 0.01-l.5% silicon, 0.0l-1.5% tantalum/ columbium, singly or severally, the remainder being iron with the usual impurities. Falling within this range of alloys are permanent magnet alloys which can be given Alloy I.-With0ut boron in the powder composition Percent Nickel 13.5
- compositions according to the invention are as follows:
- the al-loys according to the invention may also contain certain impurities in the iron remainder which are brought into the alloys by the starting materials employed. It is known that as ageneral rule these impurities should be kept as low as possible with the permanent magnet alloys of the type to which the invention relates, although it is not harmful in certain circumstances if they are occasionally present in relatively large quantities say in total up to 1.0%. This applies more especially as regards carbon, manganese, phosphorus, sulphur, chromium, tungsten, molybdenum, and the like.
- the customary boron-free permanent magnet alloys which can be age-hardened have certain properties which are detrimental to their use.
- the edges of the permanently magnetised elements made therefrom tend to break away especially when machining-the elements to finished form, e. g., during grinding, but even during subsequent use, when the permanent magnets are subjected to vibrations, striking and impact stresses. In many cases, this breaking away at the edges during mechanical treatment, and especially during grinding, cannot be tolerated since this leads to rejection and consequently uneconomic production.
- permanent magnet elements which tend to break away at the edges during use cannot be employed for many purposes, because the permanently magnetised particles that break away. can penetrate into apparatus of which the permanent magnets are part, for example, into an instrument casing, gear, How of a liquid to be magnetically filtered, and the like. Such particles may then in certain circumstances cause considerable damage, especially by adhering to iron articles.
- the alloys according to the invention have exceptional edge strength and resistance to breaking away, either during manufacture or during subsequent use. Manufacture is therefore substantially facilitated, because sintered elements as at present produced are incompatible with the method of machining which is most frequently employed with these permanent magnets, namely grinding.
- the process for the production of alloys containing boron may, however, be essentially simplified by the fact that, without harming the permanent magnetic properties and without deleteriously affecting the mechanical properties, such as edge strength and insensitivity to winding, sinteringcan be carried out in a temperature range of 1300 to 1340" C. It is readily understandable that because of the wide'limits of the range, on the one l hand, the waste is obviously reduced and, on the other The known alloys without boron are in addition extremely sensitive to the maintenance of an optimum sintering temperature. With these alloys, it is necessary to maintain the temperature accurately to within about 3-6 (3., if the permanent magnetic properties in the products are constantly to have the same high values.
- a sintered permanent magnet al-loy consisting essentially of from 5% to 40% of nickel, from 3% to 20% of aluminium, from 0.001% to 0.15% of boron and the remainder iron.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Description
7 tion.
The present invention relates to permanently magnetisable alloys and the production thereof. It is known to produce permanent. magnet alloys b United States Patent m t a combination of the alloying elements nickel, aluminium and iron. These alloys may also contain cobalt and in addition one or more of the elements copper, titanium, silicon, tantalum and columbium. Such alloys, the properties of permanent magnetisatip n of which are produced by age-hardening mayhave contents of -40% nickel and 3 to 20% aluminium and where the said further elements are present, up to 40% cobalt, up to 20% copper, up to titanium, up to 3% silicon, up to 3% of zirconium and up to 5% of tantalum or columbium or up to 5% of the tantalum and columbium together, the remainder. being iron with the usual impurities, the proportions of the constituents of the alloy being so chosen where the optional elements are present that iron is present-up to at least 30%. In the specification and claims hereof the '30 term consisting essentially of from 5% to 40% of nickel,
3% to aluminium and the remainder iron signifies that thesethree elements must be presentin the case of the nickel and aluminium within the aforesaid limits and in the case of iron in an amount at least 30%-,and that any one or more of the further elements above set forth may be present within the limits also above set forth.
Alloys as aforesaid may be produced by mixing the metal constituents with. one another in powder form,
pressing or moulding the mixture to shape and then sintering it. The alloying elements may be incorporated in the powder in the form of initial alloys of two or more components of the final alloy. The production of the alloys by the sintering method generally guarantees the production of permanent magnetic properties corresponding to those of the alloys produced by the casting method, although there are exceptions to this rule.
' form of a powdered alloy. Boron in the form of ferroboron with from 2% to 50% boron is advantageously chosen. a r v For example two ferro-alloys which areparticularly suitable are, ferroboron with about 16% boron and ferrobor'on with about 4% boron, it being immaterial if the initial alloy contains also a certain quantity of aluminium, for example, about.4%, and silicon, for example about 2%, in addition to boron.
in general, the content of boron should be kept within the limits of 0.01 to 0.15%, and remarkable fesults have been obtained, as is shown from the examples which appear hereinafter, when the boron is selected from within the narrow range of such low percentages as from .01 to .10%. These percentages are alculated on the total quantity of the materials present n the composi- The boron addition leads to an improvement in the permanent magnetic values in that the remanence values are higher in comparison with alloys without the boron 2,768,427 Patented Oct. 30, 1956 addition and the demagnetisation curve exhibits a more pronounced swelling, so that the energy product (BHm) is considerably increased. By means of the invention BHmax values riiay be obtained which are at least or even 50% or more higher than the BHmu values of such alloys without the boron addition.
Coming within the range to which the invention is applicable are all Alni and Alnico alloys at present in use. These alloys can be appreciably improved in their magnetic properties by the 'boron addition.
Particularly good results areobtained when the alloy contains 12-18% nickel, 69% aluminium, 20 -35% cobalt, 2-6% copper, 0-8% titanium, 0.001-.15%I boron, and optionally 0.01-l.5% silicon, 0.0l-1.5% tantalum/ columbium, singly or severally, the remainder being iron with the usual impurities. Falling within this range of alloys are permanent magnet alloys which can be given Alloy I.-With0ut boron in the powder composition Percent Nickel 13.5
Aluminium 8.0
Cobalt 24.0
Titanium 0.3
' Copper 3.0 Silicon 0.05
The remainder iron with the usual impurities, and in the specification and claims hereof the. term the remainder being iron" signifies that the said remainder may contain in small quantities any one or more of these impurities or other minor constituents.
'Alloy lI.-With boron in the powder composition t As Alloy l, but with 0.02% boron I have found that particularly good results can-be ob- After the sintering and suitable heat treatment, the following were obtained:
These magnetic properties with both alloys were measured in the preferred magnetic direction, which was produced by the known method of cooling in a magnetic field. The values are of course correspondingly lower in both cases if the alloys are not subjected to a treatment for the production of apreferred direction of magnetisation.
Examples of further compositions according to the invention are as follows:
Al N1 Tl on B Co 11 21 1.5 2.5 0.03 10.5 21 0.6 0.00 0.02 0.5 s '11 2.25 a 0.07s 16 -20% higher and the third 30% or more higher than corresponding alloys without boron.
The al-loys according to the invention may also contain certain impurities in the iron remainder which are brought into the alloys by the starting materials employed. It is known that as ageneral rule these impurities should be kept as low as possible with the permanent magnet alloys of the type to which the invention relates, although it is not harmful in certain circumstances if they are occasionally present in relatively large quantities say in total up to 1.0%. This applies more especially as regards carbon, manganese, phosphorus, sulphur, chromium, tungsten, molybdenum, and the like.
As is known, the customary boron-free permanent magnet alloys which can be age-hardened have certain properties which are detrimental to their use. In particular, the edges of the permanently magnetised elements made therefrom tend to break away especially when machining-the elements to finished form, e. g., during grinding, but even during subsequent use, when the permanent magnets are subjected to vibrations, striking and impact stresses. In many cases, this breaking away at the edges during mechanical treatment, and especially during grinding, cannot be tolerated since this leads to rejection and consequently uneconomic production. Furthermore, it will readily be appreciated that permanent magnet elements which tend to break away at the edges during use cannot be employed for many purposes, because the permanently magnetised particles that break away. can penetrate into apparatus of which the permanent magnets are part, for example, into an instrument casing, gear, How of a liquid to be magnetically filtered, and the like. Such particles may then in certain circumstances cause considerable damage, especially by adhering to iron articles.
The alloys according to the invention, on the contrary, have exceptional edge strength and resistance to breaking away, either during manufacture or during subsequent use. Manufacture is therefore substantially facilitated, because sintered elements as at present produced are incompatible with the method of machining which is most frequently employed with these permanent magnets, namely grinding.
purposes. The process for the production of alloys containing boron may, however, be essentially simplified by the fact that, without harming the permanent magnetic properties and without deleteriously affecting the mechanical properties, such as edge strength and insensitivity to winding, sinteringcan be carried out in a temperature range of 1300 to 1340" C. It is readily understandable that because of the wide'limits of the range, on the one l hand, the waste is obviously reduced and, on the other The known alloys without boron are in addition extremely sensitive to the maintenance of an optimum sintering temperature. With these alloys, it is necessary to maintain the temperature accurately to within about 3-6 (3., if the permanent magnetic properties in the products are constantly to have the same high values.
This makes production diificult and frequently results in rejects which cannot always be used for secondary hand, exceptionally careful supervision of the temperature is not necessary for the operation of the sintering furnaces.
What I claim is:
1. Process for improving the structure and magnetic properties of age-hardenable permanent magnet alloys essentially made by sintering powdered material consisting essentially of from 5% to '40% of nickel, from 3% to 20% of aluminium and the remainder iron, which consists in incorporating bororf in an amount of from 0.001% to 0.15% in the said material and then effecting the sintering operation on the boron-containing material.
2. Process according to claim 1 in which the boron is incorporated in the powdered material in theform of powdered ferroboron containing from 2% to 50% boron and in an amount such that the boron content of the mixture shall be from 0.001% to 0.15% of the said mixture.
3. A sintered permanent magnet al-loy consisting essentially of from 5% to 40% of nickel, from 3% to 20% of aluminium, from 0.001% to 0.15% of boron and the remainder iron. 1
4. A sintered permanent magnet alloy according to claim 3 in which the said boron content is from 0.01% to 0.10%.
References Cited in the file of this patent UNITED STATES PATENTS
Claims (1)
1. PROCESS FOR IMPROVING THE STRUCTURE AND MAGNETIC PROPERTIES OF AGE-HARDENABLE PERMANENT MAGNET ALLOYS ESSENTIALLY MADE BY SINTERING POWDERED MATERIAL CONSISTING ESSENTIALLY OF FROM 5% TO 40% OF NICKEL, FROM 3% TO 20% OF ALUMINIUM AND THE REMAINDER IRON, WHICH CONSISTS INCORPORATING BORON IN AN AMOUNT OF FROM 0.001% TO 0.15% IN THE SAID MATERIAL AND THEN EFFECTING THE SINTERING OPERATION ON THE BORON-CONTAINING MATERIAL.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2768427X | 1951-08-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2768427A true US2768427A (en) | 1956-10-30 |
Family
ID=7998013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US301611A Expired - Lifetime US2768427A (en) | 1951-08-06 | 1952-07-29 | Permanently magnetisable alloys and the production thereof |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2768427A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2978323A (en) * | 1956-12-17 | 1961-04-04 | Gen Aniline & Film Corp | Alloyed flocks from metal carbonyls and halides |
| US2983997A (en) * | 1956-12-17 | 1961-05-16 | Gen Aniline & Film Corp | Sintered magnetizable body from metal carbonyls and halides |
| US4117058A (en) * | 1976-12-03 | 1978-09-26 | General Motors Corporation | Method of making boron containing strontium ferrite |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1154701A (en) * | 1913-08-25 | 1915-09-28 | Ernst August Krueger | Process of producing tungsten filaments. |
| US1633258A (en) * | 1925-10-08 | 1927-06-21 | Clemens A Laise | Refractory metal alloy of high density and high melting point and method of making the same |
| FR749713A (en) * | 1932-02-06 | 1933-07-28 | Kinzoku Zairyo Kenkyusho | Magnetic alloy |
| US1968067A (en) * | 1930-05-29 | 1934-07-31 | Ramet Corp Of America | Alloy and method of making same |
| US2107122A (en) * | 1934-09-10 | 1938-02-01 | Clemens A Laise | Composition of matter |
| US2192743A (en) * | 1937-09-17 | 1940-03-05 | Gen Electric | Sintered permanent magnet |
| US2225424A (en) * | 1940-04-10 | 1940-12-17 | American Electro Metal Corp | Manufacture of alloys, in particular steel alloys |
| US2384450A (en) * | 1942-06-04 | 1945-09-11 | Int Nickel Co | Alloy for permanent magnets |
| US2401087A (en) * | 1945-11-08 | 1946-05-28 | J K Smit & Sons Inc | Diamond drill bit |
| US2499862A (en) * | 1948-03-16 | 1950-03-07 | Crucible Steel Co America | Permanent magnets and alloys therefor |
| US2694790A (en) * | 1948-02-17 | 1954-11-16 | Gen Electric | Sintered anisotropic permanent magnet |
-
1952
- 1952-07-29 US US301611A patent/US2768427A/en not_active Expired - Lifetime
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1154701A (en) * | 1913-08-25 | 1915-09-28 | Ernst August Krueger | Process of producing tungsten filaments. |
| US1633258A (en) * | 1925-10-08 | 1927-06-21 | Clemens A Laise | Refractory metal alloy of high density and high melting point and method of making the same |
| US1968067A (en) * | 1930-05-29 | 1934-07-31 | Ramet Corp Of America | Alloy and method of making same |
| FR749713A (en) * | 1932-02-06 | 1933-07-28 | Kinzoku Zairyo Kenkyusho | Magnetic alloy |
| US2107122A (en) * | 1934-09-10 | 1938-02-01 | Clemens A Laise | Composition of matter |
| US2192743A (en) * | 1937-09-17 | 1940-03-05 | Gen Electric | Sintered permanent magnet |
| US2225424A (en) * | 1940-04-10 | 1940-12-17 | American Electro Metal Corp | Manufacture of alloys, in particular steel alloys |
| US2384450A (en) * | 1942-06-04 | 1945-09-11 | Int Nickel Co | Alloy for permanent magnets |
| US2401087A (en) * | 1945-11-08 | 1946-05-28 | J K Smit & Sons Inc | Diamond drill bit |
| US2694790A (en) * | 1948-02-17 | 1954-11-16 | Gen Electric | Sintered anisotropic permanent magnet |
| US2499862A (en) * | 1948-03-16 | 1950-03-07 | Crucible Steel Co America | Permanent magnets and alloys therefor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2978323A (en) * | 1956-12-17 | 1961-04-04 | Gen Aniline & Film Corp | Alloyed flocks from metal carbonyls and halides |
| US2983997A (en) * | 1956-12-17 | 1961-05-16 | Gen Aniline & Film Corp | Sintered magnetizable body from metal carbonyls and halides |
| US4117058A (en) * | 1976-12-03 | 1978-09-26 | General Motors Corporation | Method of making boron containing strontium ferrite |
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