PREPARATION OF HIGH THERMAL EXPANSION COEFFICIENT PORCELAINS FUSED TO METALS

查看全文 作　　者：J.P. Yang and J.Q. WuDept. of Inorganic Materials, South China University of Technology, Guangzhou 510640, China

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2003年第16卷第4期,共5页

基　　金：This research was funded by the National High Technology Research and Development Program of China(Grant No.2002AA302204);Science and Technology Program of Guangdong Provrince of China(Grant No.2001A1070102). 摘　　要：Usually the thermal expansion coefficients (TEC) of metals are higher than that of porcelains. In order to match the TECs in the case of coating porcelains on metals, high TEC porcelains are needed. In this research, the high TEC phase leucite(KAlSi2 O6) in the high TEC porcelain was prepared by sol-gel method. The crystal size of leucite made by sol-gel is about 77nm through controlling the process parameters. The process from xerogel to leucite was investigated by means of DSC (differential scanning calorimetry), TG (thermogravimetry), XRD ( X-ray diffraction) and IR(infrared absorption spectrum). Leucite had been detected after the gel was treated at 900°C, this formation temperature is about 250°C lower than that of melting method.The porcelain made from 50% of the leucite powder and 50%o of low fused temperature frit has an average TEC of 19.2× 10-6/° C from room temperature to 450°C, which is much higher than the common porcelains. 关键词：金属陶瓷涂层热膨胀系数 PFM TEC 溶胶-凝胶白榴石

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PREPARATION OF HIGH THERMAL EXPANSION COEFFICIENT PORCELAINS FUSED TO METALS

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