γ-Al_2O_3纳米粉对氧化铝、碳化硅陶瓷纤维烧结特性的影响

INFLUENCE OF NANO-SIZED γ-Al_2O_3 POWDER ON SINTERING CHARACTERISTICS OF ALUMINA AND SILICON CARBIDE FIBERS

研究了纳米 γ- Al2 O3添加剂对氧化铝、碳化硅陶瓷纤维烧结特性和显微结构的影响。实验结果表明 ,在纤维挤压成形过程中 ,纳米 γ- Al2 O3粉填充到微米氧化铝粉的孔隙之中 ,提高了纤维的素坯密度 ,当添加剂含量为40 %时 ,纤维的素坯相对密度达到最大值。纳米 γ- Al2 O3可以促进氧化铝和碳化硅纤维的烧结 ,同时降低纤维的烧结温度 ,提高纤维的密度。

The effect of adding nano γ Al 2O 3 powder on the sintering characteristics and microstructure of alumina and silicon carbide fibers was investigated. The results showed that the nano γ Al 2O 3 powder was stuffed into the pores formed from the packing of micron alumina powder when its fiber was extruded. The density of the green alumina fiber increased with addition of nano γ Al 2O 3 powder. The maximum density of the green fiber was obtained when γ Al 2O 3 content is approximately 40%. Nano γ Al 2O 3 powder, can promote the sintering of alumina and silicon carbide fibers, and a lower sintering temperature and higher fiber density may be expected.