Al_2O_3粉粒度对硅溶胶涂料及陶瓷型壳性能的影响  

Effect of Particle Size of Al_2O_3 Powder on Property of Silica Sol Slurry and Ceramic Shell

作　　者：姚建省[1,2] 李志宏[1] 唐定中[2] 刘晓光[2] 肖克[2] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]北京航空材料研究院,北京100095

出　　处：《材料工程》2009年第7期23-27,共5页Journal of Materials Engineering

摘　　要：采用三种不同粒度的Al2O3粉配制涂料,研究涂料的流变性能,型壳力学性能及其高温自重变形性,并通过对实际浇注情况验证三种Al2O3粉的优劣。实验结果表明,三种粉料配制的涂料均具有良好的流变性能,W20+W40Al2O3粉做面层涂料工艺性能良好,型壳1500℃高温抗弯强度可达1.14MPa,自重变形减小到2.98%,可以满足合金浇注要求。实际浇注的铸件表面光滑,无粘砂、劈缝等缺陷。The Al2O3 powders of three different particle sizes were used to confect the slurry. The rheological properties of slurry and mechanical properties of ceramic shell were investigated, and the gravitational distortion of shell at high temperature was also investigated. The advantage and disadvantage of three kinds of Al2O3 powders were tested through the disquisition of actual casting instance. The experiment results indicated that the rheological properties of three slurries were all favorite, and better comprehensive properties were possessed to the shell made by W20＋W40 powder. Its bending strength at 1500℃ was up to 1.14MPa, and its gravitational distortion reduced to 2.98%. The statistical results of actual casting condition suggested that this kind of casting had favorable technological property which had smooth surface and had no sand burning and seam.

关 键 词：粒度 Al2O3粉 流变性能 高温强度 自重变形 

分 类 号：TG249[金属学及工艺—铸造]