Mechanical Properties and Performance of Engineering Ceramics and Composites IV

ISBN: 9780470457528 出版年：2009 页码：350 Dileep Singh Waltraud M Kriven Wiley

There has been a long term and sustained research and development effort in advanced ceramics in China over last few decades. In this presentation, an overview of recent research and development in the area of advanced ceramics and ceramic matrix composites will be presented. Some key results from national projects funded by Ministry of Science and Technology and National Nature Scientific Foundation of China will be provided. In addition, recent results of R & D activities in Shanghai Institute of Ceramics (SICCAS) especially in ceramic matrix composites, transparent ceramics, bio-ceramics, and mesoporous materials will also be presented. CMC development is one of the most active research areas in SICCAS including the preparation and characterization of Cf/SiC and SiCf/SiC composites. Various techniques such as chemical vapour infiltration (CVI), hot pressing, and liquid/vapour silicon infiltration (L/VSI) were used to fabricate high performance CMCs, depending on the different application requirements. A modified chemical vapor infiltration (CVI) process, which had been defined as temperature-pulsing CVI was successfully used to deposit SiC matrix into carbon fiber preforms. The final properties of CMCs were strongly dependent on the processing conditions and the nano-SiC particle size. Nano-SiC particulate phases impregnated into the fiber bundles show the reduced interaction between fibers and matrix. Active fillers in polymer impregnation and pyrolysis (PIP) aid to form new phases in the matrix to lower the volume shrinkage and provide improved performances for the composites. In the area of transparent ceramics, AI2O3, Nd-YAG, Ce-YAG, La-Y203, SI3N4 and AlON systems are being studied extensively. Among them, the in line transmittance of transparent AI2O3 has reached 70%; the average output power of lat% Nd-YAG laser transparent ceramic with size 22x39><4.5mm, at 500Hz is around 100W; The transmittance of Ce-YAG scintillation transparent ceramic at 550nm was 80%. The development of high quality transparent ceramics is mainly associated with the understanding of the fundamental principles underlying the advanced processing technologies and nanopowder synthesis and dispersion technology. An overview will be presented on the research and development efforts in biomaterials especially in hard implant materials such as