Abstract
This paper describes the oxidation behaviour of Si 3N 4/Y 2O 3-based ceramics. We prepared three kinds of ceramics, which have excellent crack-healing abilities, in different composites – Si 3N 4/Y 2O 3, Si 3N 4/SiC/Y 2O 3, and Si 3N 4/Y 2O 3/Al 2O 3 – and investigated the effect of crack-healing treatment on their oxidation behaviour. The oxidation tests were carried out at 700–1200 °C for 500 h. Measurements of weight gain and bending strength and observations of the oxidized surfaces were carried out. The main results obtained are as follows: (1) when Y 2O 3 was used as an additive, Si 3N 4 ceramics exhibited extensive oxidation at low temperatures (700–1000 °C). (2) Si 3N 4/Y 2O 3 ceramics with 3-wt% Al 2O 3 added as an additive showed no extensive oxidation. (3) Crack-healing, as a pre-oxidation treatment, is useful for increasing the oxidation–resistance of ceramics at 1000 °C and for increasing the strength.
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