Non-calcining process for CuAlO_2 and CuAl_(0.9)Ca_(0.1)O_2 ceramics

摘要

Synthesis of CuA1O_2 and CuAl_(0.9)Ca_(0.1)O_2 ceramics for thermoelectric application using a reaction-sintering process was investigated in this study. Without any calcination involved, the mixture of raw materials was pressed and sintered directly. Some peaks of remained Al_2O_3 were detected in CuAlO_2centre dot CaAl_4O_7 and CuO were detected in CuAl_(0.9)Ca_(0.1)O_2. Density values 2.83-3.04g/cm~3 were found in CuAlO_2 pellets sintered at 1350 deg C. In CuAl_(0.9)Ca_(0.1)O_2 ceramics, density values 3.10-3.31 g/cm~3 were found in pellets sintered at 1350 deg C. Thin polygonal grains were observed in CuAl_(0.9)Ca_(0.1)O_2. The reaction-sintering process has proven a simple and effective method in preparing CuAlO_2 and CuAl_(0.9)Ca_(0.1)O_2 ceramics for thermoelectric application.