Abstract
Solid/gas reaction during sintering of Si 3N 4 ceramics in an air atmosphere was investigated. The Si 3N 4 specimens were prepared from β-powder with MgO and Al 2O 3 5 wt% each as sintering aids. The oxygen content of the mixtures after milling increased with increasing milling time. The SiO 2 content was found to cause more significant mass loss of the sintered specimens than the sintering temperature. There was also a gradient of the oxygen partial pressure ( P O 2 ) in the crucible during sintering resulting in the formation of silicon oxynitride (Si 2N 2O) on the surfaces of Si 3N 4 specimens in different quantities. The mass loss reaction, amount of mass loss as a function of soaking time and sintering temperature, mass loss difference between the top and the bottom of specimens and the formation of Si 2N 2O are discussed.
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