EP0165732B1 - Durch eine disperse Phase von Titannitrid verstärkte Körper - Google Patents

Durch eine disperse Phase von Titannitrid verstärkte Körper 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
English (en)
French (fr)
Other versions
EP0165732A1 (de
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/de
Application granted granted Critical
Publication of EP0165732B1 publication Critical patent/EP0165732B1/de
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)
  • Powder Metallurgy (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (7)

1. Verfahren zur Herstellung eines durch eine Titannitrid-Dispersion verstärkten Körpers, bei dem man einen porösen Körper aus einem titanhaltigen Legierungspulver hergestellt, indem man das Pulver in einer wasserstoffhaltigen Atmosphäre erhitzt, um eine teilweise Sinterung bis zu dem Ausmaß zu erhalten, bei dem eine Matrix erzeugt wird, die durchlässig für einen Stickstoff-/Wasserstoffmischungs-Strom ist und dann bewirkt, daß eine strömende Mischung aus Stickstoff und Wasserstoff die Matrix durchdringt, um die Nitridhärtung des Titans zu bewirken, wobei die Matrix ausreichend selbsttragend ist, um dem Stömungsdruck zu widerstehen.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die teilweise Sintering bei einer Temperatur im Bereich von 900 bis 1250°C durchgeführt wird.
3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Nitridhärtung bei einer Temperatur im Bereich von 1000 bis 1150°C durchgeführt wird.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß nach dem Nitridhärtungsschritt der Körper in Wasserstoff entgast wird, um überschüssigen Stickstoff in der festen Lösung zu vermindern.
5. Verfahren nach einem der vorhergehenden Ansprüche, gekennzeichnet durch die weiteren Schritte, um einen Konstruktionsgegenstand mit rundem Querschnitt herzustellen und eine Vielzahl der scheibenförmigen Körper einer Verfestigung und Extrusion zu unterwerfen.
6. Verfahren nach einem der Ansprüche 1 bis 4, gekennzeichnet durch den weiteren Schritt um einen Konstruktionsgegenstand in Blattform herzustellen, und eine Vielzahl der Körper durch Ausrollen in eine Platte einer Verfestigung zu unterwerfen.
7. Verfahren nach einem der Ansprüche 1 bis 4, gekennzeichnet durch den weiteren Schritt der Vermahlung einer Vielzahl der Körper und Bildung von Strukturgegenständen in die erwünschten Formen durch herkömmliche Pulvermetallurgie-Formungstechniken.
EP85303822A 1984-06-15 1985-05-30 Durch eine disperse Phase von Titannitrid verstärkte Körper Expired EP0165732B1 (de)

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 (de) 1985-12-27
EP0165732B1 true EP0165732B1 (de) 1989-01-04

Family

ID=10562490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85303822A Expired EP0165732B1 (de) 1984-06-15 1985-05-30 Durch eine disperse Phase von Titannitrid verstärkte Körper

Country Status (3)

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

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.
US6416871B1 (en) 1999-05-27 2002-07-09 Sandvik Ab Surface modification of high temperature alloys
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 (de) 1985-12-27
DE3567227D1 (en) 1989-02-09
JPS613865A (ja) 1986-01-09

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