EP0165732B1 - Titanium nitride dispersion strengthened bodies - Google Patents
Titanium nitride dispersion strengthened bodies Download PDFInfo
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0068—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only nitrides
-
- 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
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.
Description
- This invention relates to bhe production of titanium nitride dispersion strengthened bodies.
- The strengthening of titanium containing alloys by gas-phase nitriding to produce a dispersion of titanium nitride is now an established procedure but the nitriding of thick sections remains a problem because the kinetics are so slow. British Patent No. 1,434,729 describes a method of making an austenitic steel artefact by gas-phase nitriding.
- According to the present invention 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.
- As previously mentioned the 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.
- In one example of the invention, the nitrided alloy is used in the production of a tie bar of'round section. In this case, 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.
- In another example, a quantity of the porous bodies may be consolidated, e.g. by a rolling technique, into sheet form. It will be understood that various other methods of consolidating quantities of the porous bodies into desired shapes may be employed.
- If desired, after nitriding the porous bodies may once again be reduced to powder, as by comminuting, for use in conventional powder metallurgy forming techniques. It is thought that the nitrided powder will exhibit less susceptibility to oxidation at room temperatures than titanium oxide dispersion-strengthened powders which require special handling, e.g. in inert atmospheres, to prevent oxidation at room temperatures.
- The invention has particular application to the nitriding of titanium-containing austenitic and ferritic steel powders, especially 20% Cr/25% Ni/ Ti powder. Thus, according to a further aspect of the invention there is provided 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.
Claims (7)
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 (en) | 1985-12-27 |
EP0165732B1 true EP0165732B1 (en) | 1989-01-04 |
Family
ID=10562490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85303822A Expired EP0165732B1 (en) | 1984-06-15 | 1985-05-30 | Titanium nitride dispersion strengthened bodies |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0165732B1 (en) |
JP (1) | JPS613865A (en) |
DE (1) | DE3567227D1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3624622A1 (en) * | 1986-07-21 | 1988-02-25 | Feichtinger Heinrich K | METHOD AND DEVICE FOR PRODUCING METALLIC MATERIALS BY HOT ISOSTATIC PRESSING OF METAL POWDER |
SE520561C2 (en) | 1998-02-04 | 2003-07-22 | Sandvik Ab | Process for preparing a dispersion curing alloy |
ES2163344B1 (en) * | 1998-07-31 | 2003-05-01 | Univ Catalunya Politecnica | NEW NITRURATION TREATMENT IN NI-TI ALLOYS FOR APPLICATION IN MEDICINE. |
WO2000073530A1 (en) | 1999-05-27 | 2000-12-07 | Sandvik Ab; (Publ) | 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 (en) * | 2011-12-28 | 2014-09-03 | 成都易态科技有限公司 | Method for adjusting pore diameter of metal porous material and pore structure of metal porous material |
Family Cites Families (2)
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 |
-
1985
- 1985-05-30 EP EP85303822A patent/EP0165732B1/en not_active Expired
- 1985-05-30 DE DE8585303822T patent/DE3567227D1/en not_active Expired
- 1985-06-10 JP JP12595485A patent/JPS613865A/en active Pending
Non-Patent Citations (1)
Title |
---|
Bernstein: Handbook of Stainless Steel (1977), Mc Graw Hill Comp., P. 29/11 * |
Also Published As
Publication number | Publication date |
---|---|
JPS613865A (en) | 1986-01-09 |
DE3567227D1 (en) | 1989-02-09 |
EP0165732A1 (en) | 1985-12-27 |
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