Abstract
Young׳s moduli of sintered porous alumina compacts were theoretically related to the development of neck growth of grain boundary between sintered two particles. This model explained well the measured Young׳s moduli as a function of normalized grain boundary area determined from the specific surface areas of sintered alumina compacts. The theoretical compressive strength was also related to the grain boundary area and the number of grains in one sintered compact. The combined linear relationship between theoretical strength and theoretical Young׳s modulus gave the theoretical strain at fracture. The above calculation of mechanical properties provided a good approximation of the measured Young׳s moduli, compressive strengths and strains at fracture of sintered alumina compacts.
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