The results show that the thermocouple wire was contaminated by phosphorus that came from the ambience gas, and Pt-P rich phase appeared at the grain boundary of the thermocouple wire, which caused the brittle fracture along the grain boundary, resulting in the thermocouple failure.
结果表明,热电偶保护管密封不严,使用时环境气氛与偶丝直接接触,磷杂质污染偶丝并在偶丝晶界上形成富Pt-P脆性相,造成沿晶脆性断裂,引起热电偶失效。
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