Shaped refractory metal boride articles and method of making them
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United States of America Patent
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Feb 19, 1985
Grant Date -
N/A
app pub date -
Dec 27, 1983
filing date -
Dec 30, 1982
priority date (Note) -
Expired
status (Latency Note)
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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: 2TiO.sub.2 +B.sub.4 C+3C.fwdarw.2TiB.sub.2 +4CO (1) TiO.sub.2 +B.sub.2 O.sub.3 +5C.fwdarw.TiB.sub.2 +5CO (2)
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