AU627960B2 - Process for applying nitrite layers to titanium - Google Patents
Process for applying nitrite layers to titanium Download PDFInfo
- Publication number
- AU627960B2 AU627960B2 AU67602/90A AU6760290A AU627960B2 AU 627960 B2 AU627960 B2 AU 627960B2 AU 67602/90 A AU67602/90 A AU 67602/90A AU 6760290 A AU6760290 A AU 6760290A AU 627960 B2 AU627960 B2 AU 627960B2
- Authority
- AU
- Australia
- Prior art keywords
- titanium
- mpa
- applying
- nitride layers
- ammonia
- 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
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
- C23C8/08—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 only one element being applied
- C23C8/24—Nitriding
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Chemically Coating (AREA)
- Physical Vapour Deposition (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Road Paving Structures (AREA)
- Revetment (AREA)
Abstract
An economical method for applying nitride layers to titanium and titanium alloys. In a short time, layer thicknesses of 20 mu m are achieved by nitriding under pressure in an ammonia atmosphere. Temperatures of 500 to 1000 DEG C and pressures of 0.2 to 10 Mpa are required for this purpose.
Description
f F 13M S& F Ref: 148111 J- u 0J COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION
(ORIGINAL)
FOR OFFICE USE: Class Int Class 0o 0 4 o a o a o 4 oo 4444 Complete Specification Lodged: Accepted: Published: Priority: Related Art: Name and Address of Applicant: Degussa Aktieigesellschaft Rodenbacher Chaussee 4 D-6450 Hanau 1 FEDERAL REPUBLIC OF GERMANY o* l o o o 44 a 4 04 4 o f 0 a O Address for Service: Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Complete Specification for the invention entitled: Process for Applying Nitride Layers to Titanium The following statement is a full description of this invention, including the best method of performing it known to me/us 5845/3 -i Description: Process for applying nitride layers to titanium The invention relates to a process for applying nitride layers to parts composed of titanium and titanium alloys by thermochemical treatment of the parts with ammonia or ammonia-containing gas mixtures under pressure and at temperatures of above 500 0
C.
Titanium has some advantages over steel as a construction e" 0 0 material, namely its low specific weight, its corrosion- 'oeo resistance, and its high strength. On the other hand, its 8 °hardness is relatively low, which necessitates a surface Qoo S 15 treatment to increase wear-resistance. This surface ooa 0o treatment generally consists in generating layers of titanium carbide or titanium nitride. Processes known hitherto for nitriding parts composed of titanium and titanium alloys involve the use of high-energy gases or S 20 electromagnetic fields. These processes are very expensive and are only applicable with parts having a simple geometry.
In DE-PS 17 96 212, the surface hardening of titanium by the 0 formation of nitride layers in an ammonia atmosphere at S 25 relatively high temperatures and normal pressure is mentioned.
Although this is intended to produce relatively thick, hard layers, this process has no practical application, since the hydrogen diffusion involved causes the core of the component to become brittle.
EP-OS 0 105 835 describes a process for manufacturing nitride layers on components composed of titanium and titanium alloys by exposing the components in an autoclave to pressures of at least 10 MPa and temperatures of at least 2001C in an ammonia atmosphere. In this case, the ammonia 3 i| must be very pure. Preferably, the nitriding takes place at to 130 MPa and temperatures of 930° to 10000C. This L.
process has the disadvantage that it is very expensive due to the use of autoclaves and very pure ammonia, and layers 20 pm thick can only be obtained in periods of three or more hours.
The object of the present invention is therefore to develop a process for applying nitride layers to parts composed of titanium and titanium alloys by -hermochemical treatment of the parts with ammonia or ammonia-containing gas mixtures o° under pressure and at temperatures of above 5000C which is economical and which permits nitride layers of 20 pm thick or more to be formed within relatively short periods.
This object is achieved according to the invention by carrying out the treatment at temperatures of 500 to 10000C and pressures of 0.2 to 10 MPa, in which case the ammonia partial pressure must be at least 0.2 MPa.
Temperatures of 700 to 9500C and pressures of 0.5 to 7 MPa 0 have proven particularly advantageous, in which case an ammonia partial pressure of at least 0.2 MPa is necessary.
o0o00~ 25 With this pressure process, components composed of titanium I and titanium alloys of any shape and tize can be provided with sufficiently thick nitride layers of 20 pm and more in 04' chamber furnaces. Surprisingly, no extremely pure gases are necessary, but the normal commercial-quality ammonia is j 30 sufficient. Furthermore, it is possible to mix nitrogen with the ammonia, in which case only an ammonia partial pressure of at least 0.2 MPa is needed for the nitriding process.
The layer thickness of the titanium nitride forming is dependent, within wide pressure ranges, on the temperature and treatment duration. The surface is golden and affords a *1I
V
i i i i m L ll~-T significant increase in hardness. At pressures in the range of above 6 MPa, the layer thickness is almost independent of the pressure.
The diagram shows the formation of a titanium nitride layer on parts composed of pure titanium as a function of the pressure and temperature of the ammonia-containing atmosphere.
Even at temperatures of 5000C, for example, at 2 MPa bar) absolute pressure, after one hour a TiN layer of 10 pm thick was measured. At 880 0 C, in this time a pure TiN layer of 20 pm is built up.
15 At a pressure of 6 MPa (=60 bar), a TiN layer of 30 pm is built up, for example, if the samples are kept at 880°C for one hour.
0 4, *0 0 4,04,0 0* 0* o 0 4 At a further increment of pressure to 9 MPa 90 bar), the 20 effect of the pressure on the thickness of the TiN layer oo decreases. The increase is no longer linear. At even higher pressures, due to the rapidly forming dense TiN 0 layer, only the diffusion of nitrogen through the layer is the time-determining factor.
S In the same way as pure titanium, titanium alloys, such as STiAl 6
V
4 for example, can be nitrided.
For these coatings, no autoclave is needed, but the treatment can take place in a standard commercial chamber furnace.
Claims (1)
- 2. Process for applying nitride layers according to claim 15 1, characterised in that the treatment takes place at temperatures of 700 to 9500C and at pressures of 0.5 to 7 MPa, and the ammonia partial pressure must be at least 0.2 MPa. 0 0 44 44 Q ID 00 0 d 0# 040 0.0a.. 0 0 4400 0 040 5 An econon titanium thicknesE an ammoni 1000CC an 0~4 20 0a 4 0 25 DATED this TWENTY-SIXTH day of NOVEMBER 1990 Degussa Aktiengesellschaft 4 0 0404B 0 4 04 0 0 04 Patent Attorneys for the Applicant SPRUSON FERGUSON 4440 0 0 04 0r 4 0 I I ii I Abstract: Process for applying nitride layers to titanium An economical process for applying nitride layers to titanium and titanium alloys. Within a short time, layer thicknesses of 20 pm are obtained by pressure-nitriding in an ammonia atmosphere. To this end, temperatures of 500 to 1000 0 C and pressures of 0.2 to 10 MPa are necessary. 0? 9 0 99 00*0 r.0 000 0 0 0 9 0* 0 *u 9 0 0 *o n)~IL L .II 'F 61h..-
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4021286 | 1990-07-04 | ||
| DE4021286A DE4021286C1 (en) | 1990-07-04 | 1990-07-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6760290A AU6760290A (en) | 1992-01-09 |
| AU627960B2 true AU627960B2 (en) | 1992-09-03 |
Family
ID=6409636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU67602/90A Ceased AU627960B2 (en) | 1990-07-04 | 1990-11-29 | Process for applying nitrite layers to titanium |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0464265B1 (en) |
| JP (1) | JPH0649924B2 (en) |
| CN (1) | CN1020476C (en) |
| AT (1) | ATE135058T1 (en) |
| AU (1) | AU627960B2 (en) |
| BR (1) | BR9101899A (en) |
| CZ (1) | CZ279472B6 (en) |
| DE (2) | DE4021286C1 (en) |
| ES (1) | ES2085320T3 (en) |
| NO (1) | NO905209L (en) |
| PL (1) | PL166281B1 (en) |
| PT (1) | PT98195A (en) |
| RU (1) | RU1836484C (en) |
| TW (1) | TW208721B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000063454A1 (en) * | 1999-04-15 | 2000-10-26 | Vacuumschmelze Gmbh | Corrosion-free iron-nickel alloy for residual-current circuit-breakers and clockworks |
| JP4684383B2 (en) * | 2000-04-03 | 2011-05-18 | 株式会社アライドマテリアル | Refractory metal material having oxidation resistant layer and method for producing the same |
| JP2001295023A (en) * | 2000-04-06 | 2001-10-26 | Allied Material Corp | High melting point metallic material having surface hardened layer and its producing method |
| US9580790B2 (en) | 2006-12-22 | 2017-02-28 | Iap Research, Inc. | System and method for surface hardening of refractory metals |
| CN102699516B (en) * | 2007-02-28 | 2015-03-18 | 沃特世科技公司 | Liquid-chromatography apparatus having diffusion-bonded titanium components |
| CN100537805C (en) * | 2007-10-30 | 2009-09-09 | 沈阳宝鼎化工设备制造有限公司 | Wear-resistant and corrosion-resistant spare part and surface treatment process thereof |
| JP5977669B2 (en) * | 2012-12-28 | 2016-08-24 | 株式会社セブン・セブン | Method for manufacturing vacuum insulated double container |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2804410A (en) * | 1953-10-27 | 1957-08-27 | Nat Lead Co | Method for nitriding titanium surfaces |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH650532A5 (en) * | 1982-09-07 | 1985-07-31 | Ver Drahtwerke Ag | METHOD FOR FORMING A HARD COATING IN THE COMPONENT FROM ELEMENTS OF THE FOURTH, FIFTH OR SIX SUB-GROUPS OF THE PERIODIC SYSTEM OR ITS ALLOYS. |
-
1990
- 1990-07-04 DE DE4021286A patent/DE4021286C1/de not_active Expired - Lifetime
- 1990-10-26 TW TW079109059A patent/TW208721B/zh active
- 1990-11-29 AU AU67602/90A patent/AU627960B2/en not_active Ceased
- 1990-11-30 NO NO90905209A patent/NO905209L/en unknown
- 1990-12-20 CN CN90110418A patent/CN1020476C/en not_active Expired - Fee Related
- 1990-12-28 AT AT90125660T patent/ATE135058T1/en not_active IP Right Cessation
- 1990-12-28 DE DE59010178T patent/DE59010178D1/en not_active Expired - Lifetime
- 1990-12-28 EP EP90125660A patent/EP0464265B1/en not_active Expired - Lifetime
- 1990-12-28 ES ES90125660T patent/ES2085320T3/en not_active Expired - Lifetime
-
1991
- 1991-05-09 BR BR919101899A patent/BR9101899A/en not_active Application Discontinuation
- 1991-06-28 CZ CS911988A patent/CZ279472B6/en unknown
- 1991-07-02 JP JP3161349A patent/JPH0649924B2/en not_active Expired - Lifetime
- 1991-07-03 PL PL91290931A patent/PL166281B1/en unknown
- 1991-07-03 RU SU915001026A patent/RU1836484C/en active
- 1991-07-03 PT PT98195A patent/PT98195A/en not_active Application Discontinuation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2804410A (en) * | 1953-10-27 | 1957-08-27 | Nat Lead Co | Method for nitriding titanium surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1020476C (en) | 1993-05-05 |
| EP0464265B1 (en) | 1996-03-06 |
| DE59010178D1 (en) | 1996-04-11 |
| TW208721B (en) | 1993-07-01 |
| RU1836484C (en) | 1993-08-23 |
| ATE135058T1 (en) | 1996-03-15 |
| CN1057866A (en) | 1992-01-15 |
| BR9101899A (en) | 1992-01-14 |
| NO905209D0 (en) | 1990-11-30 |
| JPH0649924B2 (en) | 1994-06-29 |
| PT98195A (en) | 1992-04-30 |
| PL290931A1 (en) | 1992-10-05 |
| ES2085320T3 (en) | 1996-06-01 |
| AU6760290A (en) | 1992-01-09 |
| CZ279472B6 (en) | 1995-05-17 |
| NO905209L (en) | 1992-01-06 |
| JPH04232247A (en) | 1992-08-20 |
| CS198891A3 (en) | 1992-02-19 |
| DE4021286C1 (en) | 1991-02-21 |
| PL166281B1 (en) | 1995-04-28 |
| EP0464265A1 (en) | 1992-01-08 |
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