Process for manufacturing ceramic cutting tool materials
AssigneeNippon Tungsten Co., Ltd.
InventorsKazuki Ogawa, Michito Miyahara, Mitsuhiko Furukawa
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Abstract
Sintering of a mixture of alumina and titanium carbide has been difficult heretofore, but by the intermediary action of titanium oxides, sintering of a powder mixture consisting of alumina and titanium carbide by hot-pressing at a comparatively lower temperature than that used in conventional processes becomes possible. Various procedures in which the above principle is applied, the powder mixture to be used therein and the materials produced thereby which are to be used for manuacturing cutting tools are disclosed.
Claims4
A process for manufacturing ceramic cutting tool materials which comprises mixing and thoroughly blending titanium carbide powder, titania powder and alumina powder to form a powder mixture consisting of 19-70% titanium carbide by weight, 1-10% titania by weight and the remainder alumina and having greatly improved sinterability and hot-pressing the thus prepared mixture at a temperature of 1500.degree.-1700.degree. C to form a sintered body of the mixture having a fine, dense structure as well as high mechanical strength due to the intermedial action of titanium oxide which enhances the binding between alumina and titanium carbide.
Dependencies are inferred from the claim text.