GB395721A - An improved material for tool or tool parts - Google Patents

Abstract

Molybdenum carbide may be made by heating in a reducing atmosphere to 1400-1600 DEG C. a powdered mixture of molybdenum and carbon in the theoretical proportions to produce Mo2C. Titanium carbide may be similarly made but at a higher temperature, or by treating a mixture of TiO2 and carbon, the product being again heated with carbon to remove residual oxygen. Zirconium carbide and silicon carbide may be similarly produced. Alternatively gases such as coal gas may be passed over heated powdered metal or compounds in carbon tubes. Specifications 361,363 and 383,327, [both in Group II], are referred to.ALSO:A material particularly for tools or tool parts consists of 21-50 per cent of one or more carbides of one or more sixth group elements, particularly chromium, molybdenum, and tungsten, up to 22 per cent of one or more auxiliary metals of the sixth and eighth groups, particularly nickel, cobalt, and chromium, and one or more carbides of one or more fourth group elements, particularly titanium, silicon, and zirconium, as remainder. Examples may consist of titanium carbide with 21-30 per cent of molybdenum carbide, 8-10 per cent of nickel, and up to 2 per cent of chromium; or 83-90 per cent of equal proportions of titanium carbide and molybdenum carbide, 9-15 per cent of nickel and 1-2 per cent of chromium. Up to 2 per cent of oxides of alkaline earth metals, aluminium, and silicon may be added. The mixtures are consolidated by pressure and heat, the temperature being raised to about 1400-1600 DEG C. for one or more hours. The molybdenum carbide may be made by heating in a reducing atmosphere to 1400-1600 DEG C. a powdered mixture of molybdenum and carbon in the theoretical proportions to produce Mo2C. Titanium carbide may be similarly made but at a higher temperature, or by treating a mixture of TiO2 and carbon, the product being again heated with carbon to remove residual oxygen. Zirconium carbide and silicon carbide may be similarly produced. Alternatively gases such as coal gas may be passed over heated powdered metal or compounds in carbon tubes. Specifications 361,363 and 383,327 are referred to.