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One of the advantages of fracture toughness determination is that it can be used at all temperatures and in all environments. This study compares the K(Ic) values of a silicon nitride at 20, 1200 and 1300 C, before and after exposure to a sulphidising environment. The material was held for 200 hours at 1300 C in hydrogen, with 0.4% H(2)S + 0.75% H(2)O. This paper describes the testing methodology, the matching procedures and the methods for checking the chevron quality.

Additional information

Authors: SARAIVA MARTINS C, JRC Petten (NL);STEEN M, JRC Petten (NL);GUERRA ROSA L, Instituto Superior Técnico, Lisboa (PT)
Bibliographic Reference: Paper presented: Materiais 91, Lisboa (PT), Nov. 6-8, 1991
Availability: Available from (1) as Paper PT 36502 ORA
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