B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/125, 25/128
B28B 1/50 (2006.01) C04B 35/565 (2006.01) C04B 41/00 (2006.01) C04B 41/50 (2006.01) C04B 41/85 (2006.01)
Patent
CA 1177228
ABSTRACT OF THE DISCLOSURE The invention relates to a kind of corrosion which has not yet been considered of products made of silicon carbide which are used at elevated temperatures and to a method of preventing this kind of corrosion which begins already at a moderate temperature of about 550°C and is caused by the formation of carbon monoxide in the pores inside the silicon carbide products when there is a 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 with perfectly gas tight shields or with a protective atmosphere or inversely in enhancing the access of oxygen into the pores of the mentioned products 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 per cent is reached or by providing uniformly distributed channels in the silicon carbide product, the total volume of channels being at least about 10 per cent of the outer volume of the product.
355576
Biolik Felicjan
Morys Zygmunt
Biuro Projektow Przemyslu Metali Niezelaznych "bipromet"
Swabey Ogilvy Renault
LandOfFree
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