Method of making tungsten carbide based hard metal tools or...

Details Method of making tungsten carbide based hard metal tools or... Method of making tungsten carbide based hard metal tools or...

2006-08-22

2006-08-22

Brunsman, David (Department: 1755)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C106S243000, C501S087000, C501S093000, C075S252000, C419S015000, C419S018000

Reexamination Certificate

active

07094821

ABSTRACT:
Preparation, handling, and spray drying, in an economic and environmentally-friendly way, of slurries for the production of tungsten carbide based hard metal tools or components by the powder injection molding or extrusion route is disclosed. The slurry used is based on ethanol-water and contains metal carbide and metallic raw materials as well as stearic acid and a low concentration of polyethylenimine (PEI). The concentration of PEI is 0.01–1 wt % of the raw material weight. This combination results in low-viscous slurries, which require less use of ethanol, energy, manpower, and equipment time in their preparation, handling, and spray drying. The invention also relates to the powder obtained by using the method.

REFERENCES:
patent: 2003/0124017 (2003-07-01), Kruse
patent: 2004/0138049 (2004-07-01), Yasrebi et al.
patent: 1 153 652 (2001-11-01), None
Oliverkra et al, “Deflocculation of Al203-SiC Suspensions”, www.ceramicbullentin.org, (Feb. 2001).
Zhang et al, “Aqueous Processing of SiC Green Sheets I:Dispersant”, J. Mater. Res., vol. 17, No. 8, (Aug. 2002).
E. Laarz et al., “Dispersing WC-Co powders in aqueous media with polyethylenimine”, International Journal of Refractory Metals and Hard Materials 18 (2000), pp. 281-286, no month provided.
Abstract of Swedish Patent Application No. 0104309-0 published Aug. 12, 2003.

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