Phase Sintering of Nonoxide Ceramics

Year Sintering additives sintering method and condition Thermal conductivity (Wm K ) Reference 

HP Hot-pressing HHP High-pressure hot-pressing HIP Hot-isostatic pressing GPS Gas-pressure sintering. 

Upon cooling, these liquid phases remain as glassy phases or as secondary crystalline phases in the sintered materials consequently, these hquid-phase-sintered ceramics are actually composite materials consisting of a matrix of grains and dispersed secondary phases. The thermal conductivity of these composite materials will depend on the amount, distribution state and thermal conductivity of each constituent phase in the structure. The effects of secondary phases on the thermal conductivity ofliquid-phase-sintered nonoxide ceramics are discussed in the following subsection. 

2 Effect of Secondary Phase on Thermal Conducrtivity of AIN Ceramic 

A number of models have been proposed to predict the thermal conductivity of a multiphase system. For the most simple case, in a two-phase system where the phases exhibit an alternative layer arrangement (this is well-known as Wiener s model), the thermal conductivity parallel to and perpendicular to the plane of the layers is given by the following equations [29]  

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