Excellent high temperature performance Silicon Carbide Ceramic

Silicon carbide foam ceramics are usually made from a mixture of silicon carbide powder, clay, silica and alumina, in the air firing temperature range of 1200 ~ 1400 ℃, the sintering process of silicon carbide particles and vitreous or semi-crystalline alumino-silicate compounds, the formation of ceramic body with a certain degree of strength and densities, a feature of this preparation process is that in the sintering process, no shrinkage or only slight shrinkage. Silicon carbide content generally does not exceed 75% wt, which is sufficient for the normal use of such products, because the vast majority of silicon carbide foam ceramics used as filters in the foundry field is disposable, low content of silicon carbide can effectively reduce the cost and increase the flexibility of the process, and thus improve the production efficiency. In some areas, such as burners, diesel exhaust filters, heating elements, solar receivers, etc., need to be more resistant to high temperatures and thermal shock resistance and even conductive silicon carbide foam ceramics, existing products in the lower silicon carbide content can not meet the requirements, and often need to be reused for a long period of time, therefore, it is necessary to significantly increase the existing silicon carbide foam ceramics in the content of silicon carbide, in order to improve the thermal shock resistance and long-term reuse performance. and long-term reuse performance.