Porous refractory metal boride article having dense matrix

Details Porous refractory metal boride article having dense matrix Porous refractory metal boride article having dense matrix

1976-12-20

1978-08-22

Peters, G. O.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 41, 106 733, 423297, G01B 3504

Patent

active

041086708

ABSTRACT:
Refractory metal diboride articles having an overall density of 50-90 percent of theoretical and a matrix of near theoretical density, e.g., 95-99 percent are described. They may be made by cold pressing and sintering an intimate mixture of submicron Group IVb metal diboride powder and finely divided solid hydrocarbon, e.g., microcrystalline petroleum wax. The hydrocarbon remains particulate in the cold pressed piece but is driven out by heat at the beginning of the sintering operation, thereby leaving voids which remain as gross pores surrounded by a dense matrix in the sintered article. Submicron boride powders capable of forming the dense matrix contain a minor proportion of a sintering or densifying aid such as carbon or a metal carbide such as titanium carbide, tungsten carbide, or boron carbide. The articles so produced are lighter in weight than non-porous articles of the same size, have high electrical conductivity and, by virtue of the dense matrix, have excellent resistance to chemical attack.

REFERENCES:
patent: 2360929 (1944-10-01), Blaha
patent: 3051566 (1962-08-01), Schwartz
patent: 3215545 (1965-11-01), Reidl et al.
patent: 3362818 (1968-01-01), Schwarzkopf et al.
patent: 3979500 (1976-09-01), Sheppard
Tyrrell, M. E. et al., "Bureau of Mines Report of Investigations", U.S. Dept. of Interior, 1964.

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