Hard material and method of making the same from an aqueous hard material milling slurry

Abstract

An aqueous emulsion for use in aqueous milling of hard material powder components in an aqueous slurry. The aqueous emulsion includes an oxidation inhibitor in an amount between about 0.3 weight percent and about 1.2 weight percent of the hard material powder components in the aqueous slurry. The aqueous emulsion also includes a paraffin wax in an amount between about 0.25 weight percent and about 0.75 weight percent of the hard material powder components in the aqueous slurry for vacuum dried powder and in an amount about up to 2.75 weight percent of the hard material powder components in the aqueous slurry for spray dried powder. The aqueous emulsion also includes myristic acid in an amount between about 0.10 weight percent and about 0.50 weight percent of the hard material powder components in the aqueous slurry. The balance of the aqueous emulsion is water.

Description

technical field [0001] The present invention relates to hard materials and methods of making hard materials from aqueous slurries of hard material powder components such as carbides and metal binders. More particularly, the present invention relates to hard materials such as cemented (cobalt) tungsten carbide, and the preparation of such cemented (cobalt) tungsten carbide from aqueous slurries of hard material powder components (e.g., carbides and metal binders) Methods. The hard material has properties substantially meeting or exceeding those of a hard material formed from a solvent-based hard material slurry. Background technique [0002] Attention has hitherto been the use of aqueous slurries as grinding media for grinding hard material components such as cemented carbides and metal binders. As discussed below, there are certain inherent advantages to using aqueous grinding slurries over the use of solvents such as acetone in the grinding slurries. Nebelung and Thiele ...

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Problems solved by technology

[0036] While the above references show other grinding media that use water as a grinding media for grinding hard materials, there are drawbacks to using water as a grinding media for hard materials such as cemented (cobalt) tungsten carbide

These disadvantages include oxygen absorption of the hard material component of the aqueous slurry, excessive precipitation and excessive separation of the hard material component of the aqueous slurry, and insufficient addition of additives to facilitate compaction of the resulting hard material powder in the hard material aqueous slurry Evenly distributed

Addressing some of the above-mentioned disadvantages, especially the excessive precipitation and excessive separation of the hard material components of the aqueous slurry and the insufficient uniform distribution of the additives to facilitate the compaction of the resulting hard material powder in the hard material aqueous slurry, resulting in the resulting hard material The compaction pressure of the raw material powder is reduced

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