Patent GB-422961-A (GB)
Title: Improvements in or relating to the production of hard sintered carbide materials
IPC: C22C1/05
Filed: 1933-07-19
Abstract: A hard carbide material is obtained by sintering together so as to produce a product consisting substantially of compound carbide, a compressed powdered mixture composed substantially solely of (a) a preformed hard carbide of boron, titanium, silicon, zirconium, cerium, thorium or two or more of these carbides, and (b) one or more of the metals vanadium, niobium, tantalum, molybdenum and tungsten, in substantially stoichiometrical proportions.  The pressed mixture may be sintered by heat in one or more working cycles, if desired, with intermediate mechanical treatment. According to an example, the carbide Ti2C.W2C is obtained by sintering a compressed mixture of 25 parts of Titanium carbide (TiC) with 75 parts of tungsten at a temperature of about 1600 DEG  C.  Specifications 387,684 and 395,719, [both in Group II], are referred to.  The Specification as open to inspection under Sect. 91 describes also chromium as a suitable metal and is not restricted to the employment of stoichiometrical proportions.  This subject-matter does not appear in the Specification as accepted.ALSO:A hard carbide material is obtained by sintering together so as to produce a product consisting substantially of compound carbide, a compressed powdered mixture composed substantially solely of (a) a preformed hard carbide of boron, titanium, silicon, zirconium, cerium, thorium or two or more of these carbides, and (b) one or more of the metals vanadium, niobium, tantalum, molybdenum and tungsten, in substantially stoichiometrical proportions.  The pressed mixture may be sintered by heat in one or more working cycles, if desired, with intermediate mechanical treatment.  According to an example, the carbide Ti2C.W2C is obtained by sintering a compressed mixture of 25 parts of Titanium carbide (TiC) with 75 parts of tungsten at a temperature of about 1600 DEG  C.  Specifications 387,684 and 395,719, [both in Group II], are referred to.  The Specification as open to inspection under Sect. 91 describes also chromium as a suitable metal and is not restricted to the employment of stoichiometrical proportions.  This subject-matter does not appear in the Specification as accepted.ALSO:A hard carbide material is obtained by sintering together so as to produce a product consisting substantially of compound carbide, a compressed powdered mixture composed substantially solely of (a) a preformed hard, carbide of boron, titanium, silicon, zirconium cerium, thorium or two or more of these carbides, and (b) one or more of the metals vanadium, niobium, tantalum, molybdenum and tungsten, in substantially stoichiometrical proportions.  The pressed mixture may be sintered by heat in one or more working cycles, if desired, with intermediate mechanical treatment. According to an example, the carbide Ti2C.W2C is obtained by sintering a compressed mixture of 25 parts of Titanium carbide (TiC) with 75 parts of tungsten at a temperature of about 1600 DEG C.  Specifications 387,684 and 395,719 are referred to.  The Specification as open to inspection under Sect. 91 describes also chromium as a suitable metal and is not restricted to the employment of stoichiometrical proportions.  This subject-matter does not appear in the Specification as accepted.