Method of anti-corrosive protection of silicon carbide products

Details Method of anti-corrosive protection of silicon carbide products Method of anti-corrosive protection of silicon carbide products

1984-07-31

1986-11-18

Smith, John D.

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Process of storage or protection

427431, B01J 1118

Patent

active

046235175

ABSTRACT:
The invention relates to a not as yet considered kind of corrosion of products made of silicon carbide working in elevated temperatures and discloses a method of preventing this kind of corrosion which begins already at the moderate temperature of about 550.degree. C. and is caused by the formation of carbon monoxide in the pores of the interior of the silicon carbide products in conditions of limited penetration of oxygen into these pores. The disclosed method of preventing this kind of corrosion consists in shielding part of the surface of the mentioned silicon carbide products by perfectly gastight shields or by a protective atmosphere or inversely in enhancing the access of oxygen into the pores of the mentioned product thus diluting the carbon monoxide being formed, by enlarging the number of open pores so that an open porosity of the product exceeding about 40 percent is reached or by providing uniformly distributed channels in the silicon carbide product the total volume of channels being at least about 10 percent of the outer volume of the product.

REFERENCES:
patent: 1906963 (1933-05-01), Heyroth
patent: 3653851 (1972-04-01), Gruber
patent: 3885059 (1975-05-01), Komatso et al.
patent: 4187344 (1980-05-01), Fredriksson
patent: 4226914 (1980-10-01), Terner et al.
patent: 4324843 (1982-04-01), Brennan et al.

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