CS200084B1 - Highly dispersive powdered tungsten and method of producing the same - Google Patents
Highly dispersive powdered tungsten and method of producing the same Download PDFInfo
- Publication number
- CS200084B1 CS200084B1 CS665578A CS665578A CS200084B1 CS 200084 B1 CS200084 B1 CS 200084B1 CS 665578 A CS665578 A CS 665578A CS 665578 A CS665578 A CS 665578A CS 200084 B1 CS200084 B1 CS 200084B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- tungsten
- producing
- same
- highly dispersive
- powdered tungsten
- Prior art date
Links
Landscapes
- Catalysts (AREA)
Description
Vynález a· týká vyeokodisperznáho práškového wolfrému a spóeobu jeho výroby.The invention relates to a high-dispersible tungsten powder and to a process for its production.
V aúéeaaosti aú apčsoby výroby vyeokodlspérzného wolfrému založené na redukeii bielej modifikácie kyseliny wolfrámovej vodíkem. Tento spósob má nevýhody v tom, že nie je zabezpečená dobrá reprodukovatelnost výsledkov, pričpm získávaný wolfrám má velkost čaetío vačšiu ako 1,5 /Um.In the art, and methods for producing high-molecular tungsten based on reduction of the white modification of tungstic acid with hydrogen. This method has the disadvantages that a good reproducibility of the results is not ensured, while the tungsten obtained has a particle size greater than 1.5 µm.
Uvedená nevýhody sú odstránené vysokodisperzným práškovým wolfrámom podlá vynálezu, ktorého podstata spočívá v tom, že má defektnú štruktúru, měrný povrch v rozmédzí 5 až 55 m£.g**\ velkost častíc menší než 1 /um a pozostáva aspoň z 99,7 wolfrámu, maximálně 0,3 % volného uhlíka a naJviao 0,001 % stopových nečistdtThese disadvantages are overcome by the high-dispersive tungsten powder according to the invention, characterized in that it has a defective structure, a specific surface area in the range of 5 to 55 m <2> .g " particle size of less than 1 [mu] m and consisting of at least 99.7 tungsten , maximum 0.3% free carbon and found 0.001% trace impurities
Výhodou tohoto vysokodisperznáho práškového wolfrámu je malá velikost jeho častíc, čo je výhodná vzhladom k jeho předpokládanému použitiu.The advantage of this high-dispersive tungsten powder is its small particle size, which is advantageous in view of its intended use.
Vynálezom je taktiež nový spdsob výroby tohto wolfrámu, ktorého podstata apočíva v termickom rozklade pár hexakarbonylu wolframu v rozmezí tepldt 500 až 1250 °C v atmosféře nosného plynu, tvořeného například dusíkom, argónom alebo vodíkom alebo ich kombináclou.The present invention also provides a novel process for the production of this tungsten, the nature of which is to thermally decompose tungsten hexacarbonyl vapors in the range of from 500 to 1250 ° C in a carrier gas atmosphere such as nitrogen, argon or hydrogen or a combination thereof.
Výhodou apčsobu podlá vynálezu je dobrá reprodukovatelnoat dosiahnutých výsledkov.An advantage and method of the invention is good reproducibility of the results obtained.
Pri termickom rozklade pár hexakarbonylu wolfrámu ea tento rozkládá v prietočnej aparatúre kontinuálně ňa kysličník uhelnatý a wolfrám, ktorý ae zachytává na mechanickom filtri.In thermal decomposition of tungsten hexa-carbonyl vapor, it decomposes continuously in the flow apparatus carbon monoxide and tungsten which is trapped on a mechanical filter.
200 084200 084
200 084200 084
Lmenou tepelného režimu pri sublimécii karbonylu a termickom rozklade karbonylových pár, ako aj změnou objemového prietoku nosného plynu a zloženla reakčnej atmosféry možno účinné ovplyvnit'vlastnosti produktu a získal tak vysokodisperzný práškový wolfrám a velkoalou zrna pod 1 yum, měrným povrohom 5 až 55 m?g”l a zloženla aspoň : 99,7 % wolfrámu, volný uhlík <0,3 %, stopové nečistoty < 0,001 %, pri dosiahnutí maximálněj defektnej štruktúry.By varying the thermal mode of carbonyl sublimation and thermal decomposition of carbonyl vapors, as well as varying the volume flow rate of the carrier gas and the composition of the reaction atmosphere, product properties can be effectively influenced to obtain high dispersion tungsten powder and large grain sizes below 1 µm. It has at least: 99.7% tungsten, free carbon <0.3%, trace impurities <0.001%, reaching the maximum defective structure.
Dobrá reprodukovatelnosl výsledkov vytvára předpoklady pre výrobnotechnlckú základňu pripravy katalyticky aktívneho karbidu wolfrámu. Prednosl získaného wolfrámu podlá vynálezu spočívá najma v menřom rozmeře získaných zrn a tým aj jeho vysokým měrným povrohom, Čo umožňuje řiršie priemyselné využitie.The good reproducibility of the results creates the preconditions for the production base of the preparation of catalytically active tungsten carbide. The advantage of the obtained tungsten according to the invention lies in particular in the smaller size of the obtained grains and hence its high specific surface area, which allows for a wider industrial use.
Sposob výroby vysokodisperzného práškového wolfrámu dokladajú následovně příklady prevedenia.The production method of high-dispersive tungsten powder is illustrated by the following examples.
Příklad 1Example 1
Reakčná aparatúra sa před termickým rozkladom preplachovala po dobu 0,5 h dusíkom rýchloslou prúdenia 0,2 m.e“1. Rozklad W/CO/g prebiehal v inertnej atmosféře dusíka pri teplote 500 °C. Rosným plynom bol dusík s obsahom kyslíka pod 10 ppm, lineáma rýchlosl prúdenia nosného plynu 0,2 m s-1. Reakčná aparatúra mala dlžku reakčného prlestoru 0,5 m. Wolfrámové částice sa zachytávali na meohanickom flltri s otvormi o priemere pod 0,1 /Um. NařastuJúci odpor filtra sa eliminoval vytvořením podtlaku za flltrom.The reaction apparatus was purged before thermal decomposition for 0.5 h speed, the flow of nitrogen for 0.2 Me '1. The decomposition of W / CO / g took place in an inert nitrogen atmosphere at 500 ° C. The dew gas was nitrogen with an oxygen content below 10 ppm, a linear carrier gas flow rate of 0.2 ms -1 . The reaction apparatus had a reaction space length of 0.5 m. The tungsten particles were collected on a meohanic filter with holes below 0.1 µm in diameter. The increasing filter resistance was eliminated by creating a vacuum after the filter.
Příklad 2Example 2
Reakčná aparatúra sa před termickým rozkladom preplachovala 0,3 hod. dusíkom rýchloslou prúdenia 0,4 m.e“\ Rozklad W/CO/g prebiehal v inertnej atmosféře dusíka pri teplote 1250 °C. Rosným plynom bol dusík s obsahom kyslíka pod 10 ppm, lineárna rýchlosl prúdenia nosného plynu /dusíka/ 0,4 m.s“\ Reakčná aparatúra mala dlžku reakčného prlestoru 0,5 nu Wolfrámové částice sa zachytávali na mechaniokom flltri s otvormi pod 0,1 /um.The reaction apparatus was purged for 0.3 hours before thermal decomposition. The decomposition of W / CO / g took place in an inert nitrogen atmosphere at a temperature of 1250 ° C. The dew gas was nitrogen with an oxygen content below 10 ppm, a linear carrier gas / nitrogen flow rate of 0.4 ms. The reaction apparatus had a reaction space length of 0.5 n. Tungsten particles were collected on a mechanical filter with openings below 0.1 µm. .
Vysokodisperzný práškový wolfrám z hexakarbonylu wolfrámu je vhodný najma pre výrobu katalyticky aktívneho karbidu wolfrámu pre palivové články s kyslým elektrolytom a pre katalýzu chemických procesov.High-dispersive tungsten hexacarbonyl tungsten powder is particularly suitable for the production of catalytically active tungsten carbide for acid-electrolyte fuel cells and for the catalysis of chemical processes.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS665578A CS200084B1 (en) | 1978-10-13 | 1978-10-13 | Highly dispersive powdered tungsten and method of producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS665578A CS200084B1 (en) | 1978-10-13 | 1978-10-13 | Highly dispersive powdered tungsten and method of producing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS200084B1 true CS200084B1 (en) | 1980-08-29 |
Family
ID=5414124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS665578A CS200084B1 (en) | 1978-10-13 | 1978-10-13 | Highly dispersive powdered tungsten and method of producing the same |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS200084B1 (en) |
-
1978
- 1978-10-13 CS CS665578A patent/CS200084B1/en unknown
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Bradley et al. | Synthesis of monodispersed bimetallic palladium-copper nanoscale colloids | |
| US6964693B2 (en) | Method for forming chromium anisotropic metal particles | |
| Gruenig et al. | Investigations of catalysts from the pyrolyzates of cobalt-containing and metal-free dibenzotetraazaannulenes on active carbon for oxygen electrodes in an acid medium | |
| US6746511B2 (en) | Decomposition method for producing submicron particles in a liquid bath | |
| US20210322960A1 (en) | Supported transistion metal carbide catalyst and one-step synthesis method theefore | |
| Heal et al. | The preparation of palladium metal catalysts supported on carbon part II: Deposition of palladium and metal area measurements | |
| Fitzsimons et al. | Studies of copper hydride. Part 1.—Synthesis and solid-state stability | |
| Wu et al. | TiO2 supported nano-Au catalysts prepared via solvated metal atom impregnation for low–temperature CO oxidation | |
| Tanaka et al. | Production of ultra-fine silicon powder by the arc plasma method | |
| US4325931A (en) | Method of producing ammonia | |
| CS200084B1 (en) | Highly dispersive powdered tungsten and method of producing the same | |
| Kawi et al. | Reversible carbonylation/decarbonylation of zeolite-entrapped tetrairidium clusters | |
| DE2708634C2 (en) | Process for the sinter-metallurgical production of ferromolybdenum | |
| EP1967492A1 (en) | Method for production of carbon nanotube and method for purification of the same | |
| JP4165920B2 (en) | Fine phosphorus-containing iron, method for producing the same, and apparatus for carrying out the method | |
| Giraudon et al. | Organometallic route to dimolybdenum carbide via a low-temperature pyrolysis of a dimolybdenum alkyne complex | |
| JPS6133041B2 (en) | ||
| CN108435175A (en) | A kind of modification carbon-based material and the preparation method and application thereof of catalytic oxidation-reduction reaction | |
| US5132082A (en) | Process for reducing the oxygen potential of an inert processing atmosphere | |
| Baron | Carbon monoxide oxidation on platinum-lead films | |
| JPH028304A (en) | Manufacture of tungsten powder | |
| US3702761A (en) | Carbonyl nickel powder and production thereof | |
| US3565604A (en) | Production of spherical-particle powders of metals | |
| Sakka | Sintering characteristics of cobalt ultrafine powders | |
| Rosenstiel et al. | ESCA, SIMS, SEM and XRD investigations of Pt-10% Rh catalyst-gauzes |