纳米Si_3N_4-SiC(Y_2O_3)复合粉末的氨解溶胶-凝胶法合成  

PREPARATION OF NANOSIZED Si 3N 4-SiC(Y 2O 3) COMPOSITE POWDERS BY AMMONO SOL-GEL PROCESSING

作　　者：高纪明[1] 肖汉宁[1] 杜海清[1] 

机构地区：[1]湖南大学化学化工学院

出　　处：《硅酸盐学报》1998年第5期586-591,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金;国家教委博士点基金

摘　　要：以硅溶胶、尿素和炭黑为原料，经氨解溶胶－凝胶、碳热还原法合成了纳米Ｓｉ３Ｎ４－ＳｉＣ复合粉末．通过在硅溶胶中引入Ｙ（ＮＯ３）３，合成了Ｓｉ３Ｎ４－ＳｉＣ－Ｙ２Ｏ３超细复合粉末．Ｙ２Ｏ３的加入有助于降低Ｓｉ３Ｎ４－ＳｉＣ的合成温度．采用ＸＰＳ和ＸＲＤ分析复合粉末中Ｙ的存在状态表明：一部分Ｙ固溶在Ｓｉ３Ｎ４－ＳｉＣ中，另有一部分以Ｙ２Ｏ３形式存在．Ｓｉ３Ｎ４－ＳｉＣ－Ｙ２Ｏ３复合粉末的烧结性能良好．Nanosized Si 3N 4-SiC composite powder was prepared by the process of ammono sol-gel and carbothermal reduction using silica sol, urea and carbon black. Results show that ammonolysis can accelerate the reaction rate due to the formation of a dehydrated ammono precursor. When yttira is introduced in the silica sol, a Si 3N 4- SiC-Y 2O 3 composite powder is obtained. The existence of yttira results in a decrease of the synthesizing temperature of Si 3N 4-SiC powder. The state of Y existed in Si 3N 4-SiC composite powder was investigated by X -ray diffraction (XRD) and X -ray photoelectron spectroscopy(XPS). The Si 3N 4-SiC-Y 2O 3 powder is easily sintered.

关 键 词：钠米粉末 溶胶凝胶 烧结 陶瓷 复合陶瓷 氨解 

分 类 号：TQ174.758[化学工程—陶瓷工业]