C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/123, 261/24,
C04B 35/58 (2006.01) C01B 35/04 (2006.01) C25C 3/08 (2006.01)
Patent
CA 1328284
ABSTRACT A shaped refractory article of titanium diboride or other metal has a microstructure with a weight average grain diameter of from 0.5 to 5 microns and substantially no grains larger than 10 microns diameter, from 10% to 45% by volume being made up of interconnected pores the majority having a diameter not substantially greater than 5 microns, porosity and grain size being substantially uniform throughout the microstructure, the article containing not more than about 0.2% by weight of oxygen and not more than about 0.5% by weight of carbon. The article may include inert particulate material in a matrix of the porous metal boride. The article may be formed by forming a uniformly mixed body of reactants into shaped compacts and heating the compacts to cause evolution of carbon monoxide and formation of a coherent reaction sintered product. Numerous reaction schemes are given, but the following are preferred: (1) 2TiO2 + B4C + 3C ? 2TiB2 + 4CO (2) TiO2 + B2O3 + 5C ? TiB2 + 5CO .
444367
Gesing Adam Jan
Stratford Graham
Fetherstonhaugh & Co.
Moltech Invent S.a.
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