Al_2O_3-Coated Nano-SiC Particles Reinforced Al_2O_3 Matrix Composites

查看全文 作　　者：Juxian ZHANG, Jinjun FENG and Longqiao GAOBeijing Vacuum Electronics Research Institute, PO. Box 749 Ext. Box 33, Beijing 100016, China

出　　处：《Journal of Materials Science & Technology》索引2002年第18卷第6期,共3页

基　　金：The study was supported by State Key Lab. of New Ceramics and Fine Processing of Tsinghua University Grant No. X.GZ9913. 摘　　要：Properties of Al2O3-coated nano-SiC have been compared with those of as-received SiC. The isoelectric point (IEP)of SiC changed from pH3.4 to pH7.3 after coating with the alumina precursor, which is close to that of alumina.Because both surfaces of coated SiC and Al2O3 possess higher positive charge at pH=4.5~5.0, they are uniformly dispersed in the two-phase aqueous suspensions, Then a mixed powder containing nano-SiC dispersed homogeneously into the Al2O3 matrix was achieved from flocculating the two-phase suspension. Finally, Al2O3/SiC nanocomposites were obtained by coating nano-SiC with Al2O3, in which the majority of SiC particles were located within the Al2O3 grains. The observation by transmission electron microscopy (TEM) and the analysis by the X-ray photoelectron spectroscopy (XPS) showed that cracks propagated towards the intragranular SiC rather than along grain boundaries. 关键词：纳米涂层氧化铝纳米碳化硅颗粒覆盖纳米复合材料 AL2O3 SIC

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Al_2O_3-Coated Nano-SiC Particles Reinforced Al_2O_3 Matrix Composites

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