Size Dependent Thermal Expansion Coefficient of Rod-Shaped Oxide Eutectic Ceramic

Abstract

Rod-shaped oxide eutectic ceramics fabricated through SHS process can acquire outstanding mechanical properties. First, Eshebly-Mori-Tanaka method was used to study Thermal Stress Field of rod-shaped oxide eutectic ceramics, and then average strain of rod-shaped oxide eutectic ceramics aroused thermal inconsistency is obtained. The effective thermal expansion longitudinal strain and transverse strain of rod-shaped oxide eutectic ceramics are determined by the average strain. Rod-shaped oxide eutectic ceramics is transverse isotropy and has two independent thermal expansion coefficients. The results show that the thermal expansion coefficients of rod shaped oxide eutectic ceramics are dependent on the diameter of nano-fiber. The thermal expansion coefficients will decrease when the diameter of nano-fiber decrease. When the diameter of nano-fiber is bigger than 300nm, the thermal expansion coefficients of rod shaped oxide eutectic ceramics is constants.

Microstructural evolution of supra‐nanostructure Al2O3/ZrO2 eutectic powders by combustion synthesis‐spray cooling

“…It is very difficult to synthesize large‐size eutectic ceramics concurrently with complex shape and fine microstructure by those technologies. In order to overcome this problem, non‐directional solidification technologies, such as spark plasma sintering (SPS) and combustion synthesis, were adopted by the researchers to fabricate eutectic ceramic. Compared with the ceramic prepared by directional solidification, the ceramic obtained by non‐directional solidification technology exhibits more advantages in the sample size and microstructure.…”