WO1994012679A1 - Article a base de nickel nitrure et procede de nitruration ionique - Google Patents

Article a base de nickel nitrure et procede de nitruration ionique Download PDF

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Publication number
WO1994012679A1
WO1994012679A1 PCT/US1993/010725 US9310725W WO9412679A1 WO 1994012679 A1 WO1994012679 A1 WO 1994012679A1 US 9310725 W US9310725 W US 9310725W WO 9412679 A1 WO9412679 A1 WO 9412679A1
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WO
WIPO (PCT)
Prior art keywords
article
nickel
inch
depth
base alloy
Prior art date
Application number
PCT/US1993/010725
Other languages
English (en)
Inventor
Albert Young
Original Assignee
Albert Young
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 Albert Young filed Critical Albert Young
Publication of WO1994012679A1 publication Critical patent/WO1994012679A1/fr

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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
    • C23C8/36—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 using ionised gases, e.g. ionitriding

Definitions

  • the present invention relates generally to the ion nitriding art, and is more particularly concerned with a new ion nitriding method and with case-hardened nickel-base alloy articles of unigue hardness and wearability and resistance to corrosion and oxidation.
  • case- hardened nickel-base alloy articles of unique hardness and wear resistance and resistance to corrosion and oxidation can be consistently produced.
  • the method for producing these novel articles is likewise new in the art in respect to the steps and the series of steps resulting in the novel mechanical and corrosion resistance properties.
  • the end product nickel-base alloy article is unigue in respect both to mechanical properties and corrosion resistance properties and is gualified well above nickel- base alloy articles known heretofore for purposes and applications involving jet engines.
  • Another major discovery underlying this invention is that the condition of the surface of a nickel-base alloy article is critically important. Specifically, I have found that the surface must be such that ion nitriding bombardment results in uniform penetration of the article to a depth of the order of at least 0.0004 inch.
  • Such a receptive surface can consistently be provided by precision machining, that is, light stress machining the article just prior to the ion nitriding step. Particularly good results are obtained when such machining is done to a depth of between about 0.004 to 0.006 inch and following a heat treatment step to relieve residual cold work stresses in the article.
  • the method of this invention comprises steps of providing a nickel-base alloy article of approximate desired size and shape and precision machining it to ultimate desired size and shape, then subjecting the resulting cold worked article to ion bombardment and electrical glow discharge under an atmosphere of hydrogen and nitrogen at pressure between about one and seven Torr and elevated temperature until the article is nitrided substantially uniform to depth between about 0.0004 and 0.0015 inch.
  • a novel article this invention is the case-hardened nickel-base alloy product having an unique combination of superior hardness and wearability and resistance to corrosion oxidation because of a nitride surface portion composed of a primary phase of uniform depth from about 0.0004 to 0.0015 inch.
  • FIG. 1 is a flow diagram of the process of this invention.
  • FIG. 2 is an enlarged fragmentary view of an article of this invention showing the ion nitrided surface region.
  • a nickel-base alloy article of approximate desired size and shape is precision machined to ultimate desired size and shape. This light stress machining operation is followed by an ion nitriding step, an optional intervening heat treating operation being omitted in the best present practice.
  • penetration of the ion bombardment indicted at 13 is substantially deeper than that achieved in accordance with prior practice involving the ion nitriding of more heavily cold worked nickel-base alloy bodies.
  • ion nitrided article 10 has hardness and wear resistance properties much superior to those of the best of the prior art practice and also has resistance to corrosion and oxidation and conseguently fully satisfies jet engine manufacturer reguirements.
  • nickel-base alloys generally which are subject to case hardening treatment of the ion nitriding type conducted in the manner of the practice described herein and variations thereof not presently preferred but within the scope of the present invention and the appended claims.
  • the nickel-base alloys of choice are those used generally in providing jet engine components, those being the products facing special hardness, wear resistance and corrosion and oxidation resistance requirements.
  • Such alloys include widely known and used In-713, In-718, In-738 of International Nickel Company and Rene 80 and Rene 95 of General Electric Company and a number and variety of other nickel-base alloys of generally similar compositions, properties and uses.
  • the ion nitriding process of this invention in the initial stage it will be carried out at a temperature in the range of 800 to 1200° F in a hydrogen- nitrogen atmosphere in proportion of one to ten parts of hydrogen to one part of nitrogen.
  • the pressure of the hydrogen-nitrogen atmosphere will be about 1-7 Torr and the electric potential will be in the range of 400 to 600 volts DC.
  • the depth of ion penetration will be from 0 0004 - 0.0015 inch and the time reguired depends upon the prevailing conditions, but will be long enough to provide the reguired ion penetration depth.
  • Example Bar stock of InconelTM 718 nickel-base alloy product of International Nickel Company was cut and rough machined to provide a jet engine shaft bushing of approximate size and shape of the desired ultimate article, this alloy being of the following nominal composition:
  • the article was subjected to precision machining to bring it to ultimate desired size and shape within specified tolerances, this operation involving only light work much diminished from that of the rough machining step and resulting in removal of metal to depth of about 0.005 inch.
  • the precision-machined article was then subjected to depassivation treatment by heating for one hour from initial temperature of 300°F to final temperature of 975- 1000°F under a 5-7 Torr atmosphere of pure hydrogen. Voltage applied throughout the period was in the range of 400-500DC and current was 15-25 amperes.
  • the resulting depassivated article was subjected in the same treatment vessel to ion nitriding for 36 hours during which a 75% hydrogen and 25% nitrogen atmosphere of one Torr was maintained.
  • the temperature in the ion nitriding chamber throughout the operation was 975-1000°F while electrical glow discharge and ion bombardment continued under DC potential of 400 to 600 volts and current from 15-25 amperes.
  • the article was removed from the chamber and cooled to room temperature and examined and tested. Ion nitriding depth was found to be uniformly approx. 0.0004 inch. Hardness and wear resistance proved to be surprisingly improved over the same alloy articles in non-ion nitrided condition.

Landscapes

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

Abstract

Un article (10) constitué d'un alliage à base de nickel très résistant à l'usure et à la corrosion ainsi qu'à l'oxydation est fabriqué par usinage de précision d'une pièce de forme et taille approximativement identiques à celles de l'article désiré, puis en soumettant l'article (10) usiné, froid, obtenu à un bombardement d'ions jusqu'à ce que l'article (10) soit nitruré à une profondeur d'environ 0,0005 pouce.
PCT/US1993/010725 1992-11-23 1993-11-08 Article a base de nickel nitrure et procede de nitruration ionique WO1994012679A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US98025092A 1992-11-23 1992-11-23
US07/980,250 1992-11-23

Publications (1)

Publication Number Publication Date
WO1994012679A1 true WO1994012679A1 (fr) 1994-06-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/010725 WO1994012679A1 (fr) 1992-11-23 1993-11-08 Article a base de nickel nitrure et procede de nitruration ionique

Country Status (1)

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WO (1) WO1994012679A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10435780B2 (en) * 2009-06-11 2019-10-08 Genius Solutions Engineering Company Low CTE slush molds with textured surface, and method of making and using the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578197A (en) * 1946-03-15 1951-12-11 Int Nickel Co Thermostatic device
US5176760A (en) * 1991-11-22 1993-01-05 Albert Young Steel article and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578197A (en) * 1946-03-15 1951-12-11 Int Nickel Co Thermostatic device
US5176760A (en) * 1991-11-22 1993-01-05 Albert Young Steel article and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SURFACE MODIFICATIONS TECHNOLOGIES, January 1988, JAMES C. CONYBEAR AND GRAHAM T. LEGGE, "Progress in Plasma Surface Treatments for Improved War Resistance", pp. 51-55. *
SURFACE TECHNOLOGY, Volume 9, No. 5, issued November 1979, A.S. RIZK AND D.J. McCULLOCH, "Plasma Nitriding of Inconel 625", pages 303-315. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10435780B2 (en) * 2009-06-11 2019-10-08 Genius Solutions Engineering Company Low CTE slush molds with textured surface, and method of making and using the same

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