| 摘要 |
The present invention is directed to a process for the preparation of a m etal powder having a purity at least as high as the starting powder and havi ng an oxygen content of 10 ppm or less comprising heating said metal powder containing oxygen in the form of an oxide, with the total oxygen content bei ng from 50 to 3000 ppmf in an inert atmosphere at a pressure of from 1 bar t o 10-7 to a temperature at which the oxide of the metal powder becomes therm odynamically unstable and removing the resulting oxygen via volatilization. The metal powder is preferably selected from the group consisting of tantalu m, niobium, molybdenum, hafnium, zirconium, titanium, vanadium, rhenium and tungsten. The invention also relates to the powders produced by the process and the use of such powders in a cold spray process.
|
