Influence of Nano-Yb_2O_3, Nano-Nd_2O_3 and Nano-DY_2O_3 on Sintering and Crystallization of Fused Quartz Ceramic Materials

摘要

Fused quartz powder (d_(50)=19μm) was used as raw material, nano-Yb_2O_3, nano-Nd_2O_3 and nano-DY_2O_3 were dividedly used as additive with dosages of 3% each. Fused quartz ceramic materials were sintered in reduction atmosphere at 1300°C, 1350°C and 1400°C for 1 h. The influence of rare earth nano-oxides on sintering and crystallization of the fused quartz ceramic were researched by measurements of apparent porosity, bending strength and thermal expansion ratios, and analyses of XRD and SEM. The results showed that samples added nano-Yb_2O_3 and nano-Nd_2O_3 have lower apparent porosity, higher bending strength and lower thermal expansion rate. It can be deduced that additives nano-Yb_2O_3 and nano-Nd_2O_3 have obvious effect on facilitating sintering and inhibiting crystallization of fused quartz materials at experimental temperatures.