同质溶胶包覆对熔融石英粉体烧结性能的影响  

Homogeneous Sol-coating on Sintering Properties of Fused Silica Powder

作　　者：王建军[1] 郝俊杰[1] 郭志猛[1] 石永亮[2] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]河北工业职业技术学院材料工程系,石家庄050000

出　　处：《硅酸盐学报》2013年第12期1638-1643,共6页Journal of The Chinese Ceramic Society

摘　　要：利用正硅酸乙酯水解法制备硅溶胶,在熔融石英粉体表面进行同质溶胶包覆,经过洗涤、干燥、煅烧处理后得到包覆粉体。以原始粉和包覆粉为原料,在不同烧结温度下制备了熔融石英陶瓷,研究了包覆前后粉体的烧结性能以及包覆对陶瓷烧结体析晶行为和力学性能的影响。结果表明:在熔融石英粉体表面包覆一层同质溶胶后,粉体性能明显优于原始粉体。与原始粉体烧结体相比,相同烧结温度下包覆粉体烧结体体积密度和抗弯强度明显提高,显气孔率降低,溶胶包覆没有影响熔融石英陶瓷的析晶行为。1 200℃烧结的溶胶包覆粉体样品综合性能最佳,体积密度达到1.89 g/cm3,抗弯强度最大值为30.2 MPa,没有发生析晶现象。A silica sol was firstly prepared via the hydrolysis of TEOS, and then the surface of fused silica particles was coated by a homogeneous sol layer. The coated particles were obtained after washing, drying and calcination treatment. The fused silica ceramic was prepared with the original and coated particles at different sintering temperatures. The sintering properties of the original and coated particles were investigated. The effect of sol-coating on the crystallization behavior and bending strength of the ceramic sintered samples was also analyzed. The results show that the property of the fused silica particles coated with homogeneous sol layer is superior to that of original particles. Compared to the sintered sample using original particles as a raw material, the sample with coated particles sintered shows a higher volume density, a greater bending strength and a lower apparent porosity rate. The crystallization behavior of the fused silica ceramic is not affected by the sol layer. The optimum performance of sample with the coated particles sintered （the volume density of 1.89 g/cm^3, the bending strength of 30.2 MPa, and no crystallization phenomenon） can be achieved at a sintering temperature of 1 200℃.

关 键 词：硅溶胶 熔融石英陶瓷 同质溶胶包覆 烧结性能 抗弯强度 

分 类 号：TQ174[化学工程—陶瓷工业]