Silicon carbide (SiC) quality urinary ware and its manufacturing method

摘要

SiC powder formed by molding and calcining a powder obtained by adding 0.01 to 0.7 wt% of V ₂ O ₅ , 0.01 to 0.7 wt% of CaO and 0.01 to 5 wt% of clay to a SiC powder having a maximum particle diameter of 4 mm or less. As a concave tool, the surface layer and the central portion of the SiC-quality concave tool were respectively measured by powder method by X-ray diffraction, and cristobalite having a 2θ of 21.9 ° with respect to the height of diffraction peaks of silicon carbide having a 2θ of 34.0 ° with respect to CuKa rays. When the ratio of the height of the diffraction peak was determined, the ratio of the ratio of the ratio of the ratio of the ratio to the value of the ratio of the surface layer portion was 20% or more, and the tensile strength at normal temperature was 1400 ° C. SiC quality tool characterized in that it is in the range of ± 20% of the break strength.