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li2co3改性cbs/al2o3玻璃--陶瓷的性能

Keywords: inorganicnon–metallicmaterials,cbs/al2o3,glass–ceramic,lowtemperaturesintering

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Abstract:

?以cao--b2o3--sio2(cbs)玻璃粉体和al2o3陶瓷粉体为原料,在cbs/al2o3质量比固定为50/50的玻璃--陶瓷中添加适量的li2co3作为烧结助剂,研究了li2co3添加量对cbs/al2o3玻璃--陶瓷的烧结性能、机械性能以及介电性能的影响。结果表明,li2co3可改善cbs玻璃的结构,降低其软化点温度和黏度,与al2o3反应生成低共熔相lialo2;这些因素的协同作用促进了cbs/al2o3玻璃--陶瓷的致密化进程,在830℃烧结即能获得结构较致密、气孔较少的cbs/al2o3玻璃--陶瓷。但是,添加过量的li2co3将因锂化合物的挥发而恶化cbs/al2o3玻璃--陶瓷的烧结性能、介电性能及机械性能。当li2co3添加量(质量分数)为0.50%时,在830℃烧结后获得结构最为致密的cbs/al2o3玻璃--陶瓷,其密度为2.76g?cm-3,并具有良好的介电性能和机械性能。

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