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A hot-pressed silicon nitride was exposed for 200 hours in an atmosphere that simulated coal gasification environments. It was then tested in uniaxial tension at 1200 and 1300 C, in vacuum, with different levels of applied stress in the pre- and post-exposed conditions. Creep and uniaxial stress-strain curves are presented for both conditions as well as strength and toughness results from tests carried out in the flexure mode. Results emphasised the importance of the de-vitrification of the intergranular phase on the mechanical behaviour at high temperature of these materials.

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Authors: SARAIVA MARTINS C, JRC Petten (NL);STEEN M, JRC Petten (NL);GUERRA ROSA L, CEMUL, Instituto Superior Técnico, Lisboa (PT)
Bibliographic Reference: Paper presented: Materials 93, Porto (PT), October 27-29, 1993
Availability: Available from (1) as Paper PT 37899 ORA
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