Abstract
Sialon ceramics are produced by a reaction sintering process whereby an appropriate mix of binary oxide and nitride powders is heated to temperatures at which eutectic liquids are formed which then initiate a combined process of densification and solution—reprecipitation of the final phase assemblage. At temperatures below the eutectic, side reactions occur which lead to intermediate crystalline phases being produced and after the liquid phase has appeared a continuous equilibration process takes place as the tie lines relating solid and liquid compositions in equilibrium continuously vary with temperature. Loss of gaseous species (particularly from liquid phases) is another factor which affects the composition and quality of the final product. It is clearly desirable to move from the physically and chemically in- homogeneous starting condition to the dense homogeneous finished product in a single firing operation provided that good quality material can be obtained.
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