EP0165732B1 - Ebauches renforcées par une dispersion de nitrure de titane - Google Patents

Ebauches renforcées par une dispersion de nitrure de titane Download PDF

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Publication number
EP0165732B1
EP0165732B1 EP85303822A EP85303822A EP0165732B1 EP 0165732 B1 EP0165732 B1 EP 0165732B1 EP 85303822 A EP85303822 A EP 85303822A EP 85303822 A EP85303822 A EP 85303822A EP 0165732 B1 EP0165732 B1 EP 0165732B1
Authority
EP
European Patent Office
Prior art keywords
bodies
nitriding
hydrogen
titanium
matrix
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
Application number
EP85303822A
Other languages
German (de)
English (en)
Other versions
EP0165732A1 (fr
Inventor
Lionel Houston Ford
Eric George Wilson
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Publication of EP0165732A1 publication Critical patent/EP0165732A1/fr
Application granted granted Critical
Publication of EP0165732B1 publication Critical patent/EP0165732B1/fr
Expired legal-status Critical Current

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Classifications

    • 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

  • a method of production of a titanium nitride dispersion strengthened body involves the steps of producing a porous body from titanium containing alloy powder and then causing a flowing mixture of nitrogen and hydrogen to permeate the permeable matrix of powder particles so formed so as to effect nitriding of the titanium.
  • the porous body is produced by heating the powder in a hydrogen-containing atmosphere to achieve partial sintering, i.e. sintering of the particles to such an extent that the body or matrix is permeable to the nitrogen/hydrogen gas flow and is sufficiently self-supporting to withstand the flow pressure.
  • a suitable temperature for the partial sintering is in the range of 900-1250°C.
  • the initial porous bodies are preferably disc-shaped and may be formed by heating the powder in the container in which it is to be nitrided, or in a separate container of similar shape.
  • Another method of producing the porous sinter may be by causing the powder, in a semi-molten atomised form, to impinge and accumulate on a collecting plate.
  • the bodies so formed will tend to be irregular in shape and may need machining to fit the nitriding container.
  • porous sinter must have sufficient strength not to disintegrate during the nitriding stage and sufficient interconnected porosity to allow access of the nitriding gas.
  • a suitable temperature for nitriding is in the range 1000 to 1150°C. After nitriding the body is preferably degassed in hydrogen to reduce the excess nitrogen in solid solution.
  • the nitrided alloy is used in the production of a tie bar of'round section.
  • the alloy powder may initially be produced as a plurality of disc-shaped green compacts which are then subjected to the aforesaid partial sintering and nitriding steps. Thereafter a quantity of the discs so formed may be inserted into an extrusion container and consolidated, by extrusion, into a round-section rod or bar.
  • the invention has particular application to the nitriding of titanium-containing austenitic and ferritic steel powders, especially 20% Cr/25% Ni/ Ti powder.
  • a titanium-containing steel powder-formed body which has been produced in accordance with the method of the invention.
  • the invention also extends to components consolidated from said bodies and to powder derived by comminution of said bodies.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (7)

1. Procédé de production d'une ébauche renforcée par une dispersion de nitrure de titane, ce procédé comprenant les étapes consistant à produire un corps poreux, ou une ébauche poreuse, à partir d'une poudre d'alliage contenant du titane, par chauffage de ladite poudre dans une atmosphère contenant de l'hydrogène, afin de réaliser un frittage partiel dans la mesure où l'on produit ainsi une matrice qui est perméable à l'écoulement du mélange d'azote/hydrogène, et à obliger ensuite un mélange d'azote et d'hydrogène en écoulement à traverser par perméation ladite matrice de façon à réaliser la nitruration du titane, ladite matrice pouvant suffisamment se supporter elle-même pour résister à la pression appliquée par l'écoulement.
2. Procédé selon la revendication 1, caractérisé en ce qu'on conduit le frittage partiel à une température comprise entre 900 et 1250°C.
3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on conduit la nitruration à une température comprise entre 1000et1150°C.
4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, après l'étape de nitruration, on soumet l'ébauche à un dégazage dans de l'hydrogène pour diminuer l'excès d'azote présent en solution solide.
5. Procédé selon l'une quelconque des revendications précédentes, caractérisé par les étapes supplémentaires consistant à produire un article structurel de section ronde, à soumettre plusieurs de ces ébauches, qui sont sous forme de disques, à consolidation et extrusion.
6. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par l'étape supplémentaire consistant, pour produire un article structurel sous forme de feuille ou de tôle, à soumettre plusieurs ébauches à consolidation par laminage ou roulage afin d'obtenir une feuille.
7. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par les étapes supplémentaires consistant à fragmenter plusieurs desdites ébauches et à former les articles structurels, en leur donnant les formes voulues, par des techniques classiques de formage par la métallurgie des poudres.
EP85303822A 1984-06-15 1985-05-30 Ebauches renforcées par une dispersion de nitrure de titane Expired EP0165732B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8415289 1984-06-15
GB8415289 1984-06-15

Publications (2)

Publication Number Publication Date
EP0165732A1 EP0165732A1 (fr) 1985-12-27
EP0165732B1 true EP0165732B1 (fr) 1989-01-04

Family

ID=10562490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85303822A Expired EP0165732B1 (fr) 1984-06-15 1985-05-30 Ebauches renforcées par une dispersion de nitrure de titane

Country Status (3)

Country Link
EP (1) EP0165732B1 (fr)
JP (1) JPS613865A (fr)
DE (1) DE3567227D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3624622A1 (de) * 1986-07-21 1988-02-25 Feichtinger Heinrich K Verfahren und vorrichtung zur herstellung metallischer werkstoffe durch isostatisches heisspressen von metallpulver
SE520561C2 (sv) 1998-02-04 2003-07-22 Sandvik Ab Förfarande för framställning av en dispersionshärdande legering
ES2163344B1 (es) * 1998-07-31 2003-05-01 Univ Catalunya Politecnica Nuevo tratamiento de nitruracion en aleaciones ni-ti para su aplicacion en medicina.
WO2000073530A1 (fr) 1999-05-27 2000-12-07 Sandvik Ab; (Publ) Modification de surface d'alliages haute temperature
GB2492054A (en) * 2011-06-13 2012-12-26 Charles Malcolm Ward-Close Adding or removing solute from a metal workpiece and then further processing
CN102560175B (zh) * 2011-12-28 2014-09-03 成都易态科技有限公司 金属多孔材料的孔径调节方法及金属多孔材料的孔结构

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2933386A (en) * 1956-08-01 1960-04-19 Rca Corp Method of sintering and nitriding ferrous bodies
GB1434729A (en) * 1972-11-01 1976-05-05 Gkn Group Services Ltd Method of making an austenitic steel artifact

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Bernstein: Handbook of Stainless Steel (1977), Mc Graw Hill Comp., P. 29/11 *

Also Published As

Publication number Publication date
EP0165732A1 (fr) 1985-12-27
DE3567227D1 (en) 1989-02-09
JPS613865A (ja) 1986-01-09

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