窒化ケイ素セラミックスの溶液腐食試験(第3報) : 加熱硫酸中における腐食挙動と腐食層の組織

概要

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Corrosion behavior of gas pressure sintered silicon nitride ceramics was investigated in sulfuric acid solution with respect to the effect of solution temperature and to the microstructure of corroded layer. Weight loss of samples after corrosion test was severe ill boiling solution as compared with in 90℃ solution. Nevertheless strength degradation occurred similarly in each solution. The gradual growth of corrosion is considered to be controlled by the dissolution reaction of grain boundary phase of silicon nitride ceramics in sulfuric acid solution. The drastic strength degradation at initial stage is considered to be ascribed to the relaxation of the residual compressive stress during corrosion which was introduced on surfaces of specimens by machining.
社団法人日本セラミックス協会の論文
1992-07-01