Method and apparatus for manufacturing fine powders

Details Method and apparatus for manufacturing fine powders Method and apparatus for manufacturing fine powders

2005-09-06

2005-09-06

Wyszomierski, George (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

C075S352000, C075S354000, C075S360000, C264S003400, C264S414000, C264S423000

Reexamination Certificate

active

06939389

ABSTRACT:
The manufacture of pure, fine spherical powders has always been a problem for many materials, particularly for high-melting and highly reactive materials such as titanium, tantalum, vanadium and zirconium. The present invention provides a process and apparatus for producing such powders by rapidly heating course powders containing a gas or gases to near or above their melting point, whereby the contained gas erupts explosively to form many fine particles of the host material. The fine particles are typically, but not necessarily spheroidal, depending upon the process conditions at the time of eruption and immediately thereafter. Methods are described for producing, collecting, handling, storing and passivating said fine powders.

REFERENCES:
patent: 3302892 (1967-02-01), Nilsson
patent: 3854896 (1974-12-01), Switzer et al.
patent: 4238430 (1980-12-01), Phillips
patent: 4313737 (1982-02-01), Massey et al.
patent: 4406700 (1983-09-01), Maeland
patent: 4501717 (1985-02-01), Tsukamoto et al.
patent: 5756928 (1998-05-01), Ito et al.
patent: 6168644 (2001-01-01), Fukasawa et al.

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