CS199103B1 - Method of metallic details cover having high melting temperature,especially made from molybden,tantalum by pyrrolitic graphite - Google Patents
Method of metallic details cover having high melting temperature,especially made from molybden,tantalum by pyrrolitic graphite Download PDFInfo
- Publication number
- CS199103B1 CS199103B1 CS805477A CS805477A CS199103B1 CS 199103 B1 CS199103 B1 CS 199103B1 CS 805477 A CS805477 A CS 805477A CS 805477 A CS805477 A CS 805477A CS 199103 B1 CS199103 B1 CS 199103B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- tantalum
- high melting
- coated
- tungsten
- graphite
- Prior art date
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 14
- 229910002804 graphite Inorganic materials 0.000 title claims description 14
- 239000010439 graphite Substances 0.000 title claims description 14
- 238000002844 melting Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 10
- 229910052715 tantalum Inorganic materials 0.000 title claims description 9
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 title claims description 9
- 230000008018 melting Effects 0.000 title claims description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims description 10
- 239000011733 molybdenum Substances 0.000 claims description 10
- 229910052697 platinum Inorganic materials 0.000 claims description 10
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 9
- 229910052721 tungsten Inorganic materials 0.000 claims description 9
- 239000010937 tungsten Substances 0.000 claims description 9
- 229910052702 rhenium Inorganic materials 0.000 claims description 7
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- -1 tantalum pyrol Chemical compound 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims 1
- 230000007935 neutral effect Effects 0.000 claims 1
- 230000001681 protective effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Landscapes
- Chemical Vapour Deposition (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Cold Cathode And The Manufacture (AREA)
- Laminated Bodies (AREA)
Description
Vynález se týká způsobu pokryvu kovových součástí o vysoké teplotě tání, zvláště z molybdenu, wolframu a tantalu pyrolitickým grafitem.The present invention relates to a method of coating metal parts of high melting point, in particular of molybdenum, tungsten and tantalum with pyrolithic graphite.
V moderních vakuových nebo plynem plněných elektronických zařízeních mnohdy již nevyhovují klasické materiály, které se dosud všeobecně osvědčily jak pro svoji odolnost při vysokých teplotách, tak pro snadnou odpiynitelnost, výhodnou výstupní práci, vyzařovací koeficient, mechanické vlastnosti aj. Moderní vakuová elektronika kladoucí na tyto materiály značně vyšší nároky, musí hledat bu3 zcela nové materiály, což je značně obtížné, nebo hledat metody, kterými je možno vlastnosti stávajících materiálů zlepšit.In modern vacuum or gas-filled electronic devices, classic materials, which have so far proven to be generally well-proven both for their high temperature resistance and for easy detachability, convenient output work, radiation coefficient, mechanical properties etc. considerably higher demands, they must either look for completely new materials, which is very difficult, or look for methods by which the properties of existing materials can be improved.
Tento vynález řeší úpravu povrchu molybdenových, wolframových, tantalových součástí nebo součástí z jiných kovů o vysoké teplotě táni tak, aby vyhovovaly nejvyšěím požadavkům ve vakuu nebo v plynné atmosféře, a to především při zvýšené teplotě. Úprava se provádí nanášením vrstvy pyrolytického grafitu, která nejen zlepší odolnost základního kovového materiálu proti vysokým teplotám, ale nevíc díky anisotropii evých vlastností podstatně zlepší i tepelné, elektrické a mechanické vlastnosti celé součásti.The present invention solves the surface treatment of molybdenum, tungsten, tantalum or other high-melting metal parts to meet the highest requirements in a vacuum or gaseous atmosphere, especially at elevated temperature. The treatment is carried out by applying a layer of pyrolytic graphite, which not only improves the resistance of the base metal material to high temperatures, but also, due to the anisotropy of its properties, significantly improves the thermal, electrical and mechanical properties of the whole component.
Tvorba vrstvy pyrolytického grafitu pyrolytiekým rozkladem různých uhlovodíků naFormation of pyrolytic graphite by pyrolytic decomposition of various hydrocarbons into
199 103199 103
198103 žhavé podložce je znéma již řadu let. Je-li pyrolýza prováděna na žhavé podložce, je jednou z hlavních obtíží tvorba karbidů podložky. Tyto karbidy způsobují křehnutí a často až destrukci kovové podložky případně změny v rozměrech. Tak je tomu také u zmíněných kovů o vysoké teplotě tání, jmenovitě molybdenu, wolframu a tantalu. Tak například molybden je napadán uhlovodíkovými parami již při 1 370 °K a karbidizace probíhá velice rychle při 1 570 až 1 670 °K až do úplné přeměny na karbid. Shora uvedené nedostatky jsou odstraněny postupem podle vynálezu.198103 hot mat has been known for many years. When pyrolysis is carried out on a hot mat, one of the main difficulties is the formation of a carbide mat. These carbides cause embrittlement and often even destruction of the metal substrate or changes in dimensions. This is also the case for the high melting point metals mentioned, namely molybdenum, tungsten and tantalum. For example, molybdenum is attacked by hydrocarbon vapors already at 1370 ° K and carbidization proceeds very rapidly at 1570 to 1670 ° K until complete conversion to carbide. The above drawbacks are overcome by the process according to the invention.
Předmětem vynálezu je způsob pokryvu kovových součástí o vysoké teplotě tání, zvláStě z molybdenu, wolframu a tantalu pyrolytickým grafitem, vyznačený tím, že tyto kovové součásti ve formě vláken, drátků, plechů, nebo tvarovaných částí se nejdříve opatří vrstvou rhenia, potom platiny nebo platinových kovů a nakonec se opatří vrstvou pyrolytického grafitu.SUMMARY OF THE INVENTION The present invention relates to a method of coating high melting metal parts, in particular molybdenum, tungsten and tantalum pyrolytic graphite, characterized in that the metal parts in the form of fibers, wires, sheets or shaped parts are first coated with rhenium, then platinum or platinum. and finally coated with pyrolytic graphite.
Platina a platinové kovy jsou jedny z mála kovů, která netvoří za těchto podmínek karbidy. Protože platinu a platinové kovy není možno dosti dobře galvanicky nanášet na zmíněné kovy, je výhodné součástky z takových kovů předem opatřit vrstvou rhenia, která také netvoří za těchto podmínek karbidy. Z toho důvodu je právě výhodné použít jmenované dvojvretvy rhenia a platiny nebo platinových kovů. Tyto vrstvy je účelné nanášet galvanicky z příslušných solí. Po pokryvu základních kovových částí rheniem v mikrometrové tlouštce je třeba tuto část vyžíhat ve vakuu nebo v ochranném plynu na teplotu nejméně 1 200 K. Stejné žíhání a za stejných podmínek je třeba provést i po nanesení další vrstvy platiny nebo platinového kovu. Je vhodné, aby tlouštka každé jmenované vrstvy byla v řádu několika mikrometrů. Tím je pak součástka z jmenovaných kovů o vysoké teplotě tání, například z molybdenu, wolframu, tantalu připravena pro pokryv pyrolytlokým grafitem jedním ze známých způsobů, aniž by při tom došlo k jejímu nebezpečnému zkřehnutí následkem karbidizace. Tyto soušásti pokryté rheniem a platinovými kovy se vyžíhají a potom pokrývají vrstvou pyrolytického grafitu při teplotě 1 200 až 2 600 K.Platinum and platinum metals are among the few metals that do not form carbides under these conditions. Since platinum and platinum metals cannot be deposited quite well on said metals, it is advantageous to pre-coat such metal components with a rhenium layer which also does not form carbides under these conditions. For this reason, it is precisely advantageous to use the two-layered rhenium and platinum or platinum metal bilayers. It is expedient to apply these layers galvanically from the respective salts. After the rhenium has been coated in micrometer thickness of the base metal parts, it must be annealed in vacuum or shielding gas to a temperature of at least 1200 K. The same annealing and under the same conditions should be carried out after the application of another layer of platinum or platinum metal. Preferably, the thickness of each of said layers is in the order of several micrometers. Thus, a component of said high melting point metals, such as molybdenum, tungsten, tantalum, is prepared for covering with pyrolytocolite graphite by one of the known methods, without causing a dangerous embrittlement due to carbidization. These parts coated with rhenium and platinum metals are ignited and then coated with a layer of pyrolytic graphite at a temperature of 1200 to 2600 K.
Claims (4)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS805477A CS199103B1 (en) | 1977-12-02 | 1977-12-02 | Method of metallic details cover having high melting temperature,especially made from molybden,tantalum by pyrrolitic graphite |
| DD20919078A DD140482A1 (en) | 1977-12-02 | 1978-11-20 | METHOD OF OVERLOOKING METAL PARTS WITH PYROLYTIC GRAPHITE |
| PL21140378A PL112532B2 (en) | 1977-12-02 | 1978-12-01 | Method of coating with pyrolytic graphite the metal elements of high dew-point,especially made of molybdenum,wolfram and tantalum |
| SU782695251A SU983810A1 (en) | 1977-12-02 | 1978-12-01 | Coating forming method |
| HUTE000917 HU177268B (en) | 1977-12-02 | 1978-12-01 | Process for coating pieces made of metals with high melting pointparticularly of molybdneum,tungsten or tantalum - with pyrolitic graphite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS805477A CS199103B1 (en) | 1977-12-02 | 1977-12-02 | Method of metallic details cover having high melting temperature,especially made from molybden,tantalum by pyrrolitic graphite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS199103B1 true CS199103B1 (en) | 1980-07-31 |
Family
ID=5430621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS805477A CS199103B1 (en) | 1977-12-02 | 1977-12-02 | Method of metallic details cover having high melting temperature,especially made from molybden,tantalum by pyrrolitic graphite |
Country Status (5)
| Country | Link |
|---|---|
| CS (1) | CS199103B1 (en) |
| DD (1) | DD140482A1 (en) |
| HU (1) | HU177268B (en) |
| PL (1) | PL112532B2 (en) |
| SU (1) | SU983810A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH647815A5 (en) * | 1980-04-19 | 1985-02-15 | Kurt Fischer | PROCESS FOR BLACKING METAL SURFACES. |
| GB2254616A (en) * | 1991-04-11 | 1992-10-14 | Leonard Wisniewski | Anticorrosive coating composition |
| JP3044683B2 (en) * | 1995-03-17 | 2000-05-22 | 科学技術振興事業団 | Method for forming graphite layer, X-ray optical element having graphite layer formed by the method, and method for manufacturing X-ray optical element |
-
1977
- 1977-12-02 CS CS805477A patent/CS199103B1/en unknown
-
1978
- 1978-11-20 DD DD20919078A patent/DD140482A1/en not_active IP Right Cessation
- 1978-12-01 SU SU782695251A patent/SU983810A1/en active
- 1978-12-01 HU HUTE000917 patent/HU177268B/en unknown
- 1978-12-01 PL PL21140378A patent/PL112532B2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SU983810A1 (en) | 1982-12-23 |
| DD140482A1 (en) | 1980-03-05 |
| PL112532B2 (en) | 1980-10-31 |
| PL211403A1 (en) | 1979-07-30 |
| HU177268B (en) | 1981-08-28 |
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