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WO1995029270A1 - Procede de traitement de pieces de titane - Google Patents

Procede de traitement de pieces de titane Download PDF

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Publication number
WO1995029270A1
WO1995029270A1 PCT/US1995/004763 US9504763W WO9529270A1 WO 1995029270 A1 WO1995029270 A1 WO 1995029270A1 US 9504763 W US9504763 W US 9504763W WO 9529270 A1 WO9529270 A1 WO 9529270A1
Authority
WO
WIPO (PCT)
Prior art keywords
parts
titanium
nitrogen
furnace
atmosphere
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.)
Ceased
Application number
PCT/US1995/004763
Other languages
English (en)
Inventor
Douglas W. Fay, Sr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sturm Ruger and Co Inc
Original Assignee
Sturm Ruger and Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sturm Ruger and Co Inc filed Critical Sturm Ruger and Co Inc
Priority to JP7527717A priority Critical patent/JPH10503551A/ja
Priority to EP95917579A priority patent/EP0763143A4/fr
Priority to KR1019960705985A priority patent/KR970702386A/ko
Publication of WO1995029270A1 publication Critical patent/WO1995029270A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1031—Alloys containing non-metals starting from gaseous compounds or vapours of at least one of the constituents

Definitions

  • the present invention comprises a method of treating titanium-containing parts having the r.teps of creating in a furnace at atmospheric pressure mixture of nitrogen, methanol and optionally natural gas or propane, causing such mixture to obtain an equilibrium; then introducing the titanium parts into the furnace and finally reducing the furnace temperature to a range of 1450°F. to 1850F 0 for a time period of between five (5) and six hundred (600) minutes. It is a feature of the method that the surface area of the titanium parts so treated are very hard and gall resistant.
  • a coating caused to form on and at the alloy surface during treatment consists predominantly of titanium oxides with regions of oxynitrides and at times some carbonitrides.
  • Fig. 1 is a partially sectioned elevational view of the apparatus used to carry out the present inventive method.
  • apparatus 10 includes furnace 11, furnace chamber box 12 and titanium parts basket 14 supported by blocks 15.
  • Chamber 12 has three gaseous conduit inlets 16, 17, and 18.
  • Conduit 16 supplies methanol from methanol tank 21 to sparger 22 with shaft.
  • Conduit 17 supplies natural gas from gas tank 23 and conduit 18 supplies nitrogen from nitrogen tank 24.
  • Fan 27 with shaft provides for mixing and circulation of gases in chamber 12 and exhaust chimney 29 (not shown) conducts exhaust gases from chamber 12.
  • Sensor 37 measures the temperature, oxygen and gas components in chamber 12.
  • Process monitoring unit 31 controls valves 33, 34, 35 in conduits 16, 17, and 18 respectively to control the mixture in chamber 12.
  • the combination of the gases in chamber box 12 creates a hydrocarbon inert gas mixture which is varied to achieve the metallurgical layer characteristics of the parts desired and is composed of an atmosphere of carbon dioxide between 15-25%, hydrogen between 30-50% and nitrogen between 30-50% using, as supply, gaseous nitrogen, methanol, and propane or natural gas. Gaseous percentages are by volume.
  • Process control equipment employed may include but is not limited to oxygen measuring and control. Atmosphere characterization equipment may be used but is not necessary.
  • Parts which are treatable using the present invention are 100% titanium or alloys of titanium including:
  • the surface hardness of treated samples was significantly higher than that of the untreated samples with the balance of properties essentially similar.
  • Example A batch of firearm triggers made of Alloy A were placed in a furnace in which nitrogen, methanol and natural gas are introduced in proportions of nitrogen: 40% (gas) ; methanol: 58-60% (liquid); and propane: 0-2% (gas) to create in the furnace a gaseous atmosphere of:
  • the gaseous atmosphere was at or near atmospheric pressure.
  • the treatment atmosphere is a complex mixture of: nitrogen C0 2
  • Methane dissociates to form hydrogen and carbon dioxide to accomplish the parts treatment including carburizing of the parts surfaces.
  • Equilibrium is obtained upon completion of reactions of the mixture in the furnace.
  • An equilibrium reaction equation is 2N 2 +CH 3 OH *+ 2N 2 +2H 2 +CO.
  • Equilibrium determination is accomplished by indirect means such as the analysis of the implanted or diffused carbon level in the material surface treated.
  • Other methods include the measurement of the carbon potential by the oxygen probe located in the furnace which indicates the carbon potential by an algorithm assuming a consistent level of CO gas in the furnace atmosphere. Carbon potential is largely equivalent to a function of the oxygen content assuming a constant CO content. If the CO content changes, the same oxygen % will yield a different carbon potential.
  • an algorithm is used to put all the variables in perspective.
  • the control of carbon by maintaining a consistent atmosphere and then using oxygen % as a control parameter is very important.
  • a principle of control of the process is controlling the proportions of gases flowing into the furnace.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

La présente invention concerne d'une part un procédé de traitement de pièces contenant du titane et d'autre part les pièces ainsi traitées. Le traitement consiste à placer les pièces dans la chambre d'un four (12) dont l'atmosphère gazeuse se compose à 15-25 % de dioxyde de carbone, à 30-50 % d'azote, et à 30-50 % d'hydrogène. L'atmosphère est portée à une température comprise entre 1450-1850 °F, et la durée du traitement est de 5-60 minutes. Ces pièces présentent une dureté et une résistance à la contrainte et à l'usure accrues.
PCT/US1995/004763 1994-04-25 1995-04-18 Procede de traitement de pieces de titane Ceased WO1995029270A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP7527717A JPH10503551A (ja) 1994-04-25 1995-04-18 チタン部品の処理方法
EP95917579A EP0763143A4 (fr) 1994-04-25 1995-04-18 Procede de traitement de pieces de titane
KR1019960705985A KR970702386A (ko) 1994-04-25 1995-04-18 티타늄 부품 처리방법(method of treating titanium parts)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23289094A 1994-04-25 1994-04-25
US232,890 1994-04-25

Publications (1)

Publication Number Publication Date
WO1995029270A1 true WO1995029270A1 (fr) 1995-11-02

Family

ID=22875015

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/004763 Ceased WO1995029270A1 (fr) 1994-04-25 1995-04-18 Procede de traitement de pieces de titane

Country Status (5)

Country Link
EP (1) EP0763143A4 (fr)
JP (1) JPH10503551A (fr)
KR (1) KR970702386A (fr)
CN (1) CN1151192A (fr)
WO (1) WO1995029270A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997014820A1 (fr) * 1995-10-18 1997-04-24 Sturm, Ruger & Company, Inc. Procede de traitement de pieces en titane
WO2003074752A1 (fr) * 2002-02-28 2003-09-12 Swagelok Company Cementation de titane
CN103589987A (zh) * 2013-12-06 2014-02-19 龙工（上海）精工液压有限公司 一种柱塞泵用传动轴的热处理工艺
CN107779812A (zh) * 2017-10-19 2018-03-09 宝鸡市金海源钛标准件制品有限公司 一种医用钛合金表面的改性方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322255A (en) * 1979-01-15 1982-03-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Heat treatment of steel and method for monitoring the treatment
US4450205A (en) * 1979-10-26 1984-05-22 Mitsubishi Kinzoku Kabushiki Kaisha Surface-coated blade member of super hard alloy for cutting tools and process for producing same
US5069728A (en) * 1989-06-30 1991-12-03 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for heat treating metals in a continuous oven under controlled atmosphere
US5298090A (en) * 1992-12-22 1994-03-29 Air Products And Chemicals, Inc. Atmospheres for heat treating non-ferrous metals and alloys

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5039357A (en) * 1990-06-15 1991-08-13 Dynamic Metal Treating, Inc. Method for nitriding and nitrocarburizing rifle barrels in a fluidized bed furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322255A (en) * 1979-01-15 1982-03-30 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Heat treatment of steel and method for monitoring the treatment
US4450205A (en) * 1979-10-26 1984-05-22 Mitsubishi Kinzoku Kabushiki Kaisha Surface-coated blade member of super hard alloy for cutting tools and process for producing same
US5069728A (en) * 1989-06-30 1991-12-03 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for heat treating metals in a continuous oven under controlled atmosphere
US5298090A (en) * 1992-12-22 1994-03-29 Air Products And Chemicals, Inc. Atmospheres for heat treating non-ferrous metals and alloys

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
See also references of EP0763143A4 *
STEEL, 02 November 1953, "Surface of Treatment of Titanium", pp. 130-132. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997014820A1 (fr) * 1995-10-18 1997-04-24 Sturm, Ruger & Company, Inc. Procede de traitement de pieces en titane
WO2003074752A1 (fr) * 2002-02-28 2003-09-12 Swagelok Company Cementation de titane
CN103589987A (zh) * 2013-12-06 2014-02-19 龙工（上海）精工液压有限公司 一种柱塞泵用传动轴的热处理工艺
CN107779812A (zh) * 2017-10-19 2018-03-09 宝鸡市金海源钛标准件制品有限公司 一种医用钛合金表面的改性方法

Also Published As

Publication number Publication date
EP0763143A1 (fr) 1997-03-19
JPH10503551A (ja) 1998-03-31
KR970702386A (ko) 1997-05-13
CN1151192A (zh) 1997-06-04
EP0763143A4 (fr) 1997-06-11

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