Boron-treated hard metal
First Claim
Patent Images
1. A cemented carbide body, comprising:
- a tungsten carbide phase;
a cobalt binder phase; and
a third phase comprising cobalt, tungsten, boron, and carbon.
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Abstract
A hard, relatively non-brittle, cemented carbide body is made by sintering pressed grade carbide powders in the presence of a boron-containing material such as boron nitride. During sintering, appreciable quantities of boron migrate or diffuse into the body to become incorporated throughout the microstructure of the carbide resulting in the formation of a third quarternary phase comprised of tungsten, cobalt, boron and carbon.
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Citations
16 Claims
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1. A cemented carbide body, comprising:
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a tungsten carbide phase; a cobalt binder phase; and a third phase comprising cobalt, tungsten, boron, and carbon. - View Dependent Claims (2, 3, 4, 5, 6, 10)
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7. A cemented carbide body, comprising:
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(a) a carbide phase, including a carbide former and carbon; (b) a binder phase made mostly of a binder element; and (c) a dispersion of boron-containing material throughout the body, wherein the microstructure of said carbide body, when etched with Murakami'"'"'s Reagent, exhibits an etch phase throughout the body. - View Dependent Claims (8, 9, 11, 12, 16)
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13. A cemented carbide body, comprising:
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(a) a carbide phase; (b) a binder phase having less than 30 percent by weight of carbide former; and (c) a third phase including a binder material and boron. - View Dependent Claims (14, 15)
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Specification