Shaped refractory metal boride articles and method of making the

Details Shaped refractory metal boride articles and method of making the Shaped refractory metal boride articles and method of making the

1983-12-27

1985-02-19

Poer, James

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04H 3558

Patent

active

045006431

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:

REFERENCES:
patent: 4108670 (1978-08-01), Steiger et al.

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