To solve such a conventional problem that, although cemented carbide is a high hardness and high toughness material and various trace elements including vanadium carbide (VC) are added to bring out its performances, the grain size of a raw material prepared by pulverizing a carbide become large when the vanadium carbide (VC) is used and, as a result, uniform improvement of properties in a product cannot be done.
One of component materials of a stock for a tool, such as a hob, is replaced from a carbide to vanadium trioxide (V2O3) as an oxide. Since vanadium oxide is softer than vanadium carbide, vanadium oxide can be easily reduced in particle size in a mixing step using a ball mill in the course of raw material blending. The hardness of cemented carbide after sintering can hereby be increased by the effect of the vanadium trioxide uniformly dispersed in the raw material.
TAZANE YOICHI
KIGAMI YUKIO
KIKUCHI TAIJI
| JPS50160140A | 1975-12-25 | |||
| JP2005097652A | 2005-04-14 | |||
| JPH04147939A | 1992-05-21 |
Kunio Ueda