Manufacturing method for ultra fine composite powder of...

Details Manufacturing method for ultra fine composite powder of... Manufacturing method for ultra fine composite powder of...

2006-04-27

2008-12-30

Wyszomierski, George (Department: 1793)

Specialized metallurgical processes, compositions for use therei

Processes

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

C075S360000, C148S207000

Reexamination Certificate

active

07470309

ABSTRACT:
The present invention relates to an economically excellent method for manufacturing ultra fine tungsten carbide-cobalt composite powder having tungsten compound and cobalt compound as its raw material. More particularly, the present invention provides a manufacturing method comprising a process for mixing tungsten compounds, cobalt compounds, grain-grown inhibitor compounds and oxide in a mechanical method, a calcination process for removing ammonia and moisture of the mixed powder and forming it into an composite oxide, a reduction process for manufacturing said calcined powder into pure metal powder, a mixing process for adding carbon source to said reduced powder, and a carburization process for manufacturing the mixed powder into a tungsten carbide-cobalt composite powder, which is the final form. Using the manufacturing method of the present invention, ultra-fine tungsten carbide-cobalt composite powder having an ultra-fine particle size of 0.1˜0.2 μm, 0.2˜0.3 μm,0.3˜0.4 μm and high properties such as high hardness, high toughness wherein the binder phase is uniformly mixed can be manufactured. In particular, a tungsten carbide-cobalt composite powder having economic advantages through price competitiveness of the compound using tungsten compounds and cobalt compounds and simplification of process can be manufactured.

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patent: 5885372 (1999-03-01), Seegopaul
patent: 6511551 (2003-01-01), Kim et al.
patent: 10-2003-0024174 (2003-03-01), None

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