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首页> 美国政府科技报告 >Synthesis of alumina-coated SiC whiskers for production of SiC whisker-reinforced alumina composite materials.
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Synthesis of alumina-coated SiC whiskers for production of SiC whisker-reinforced alumina composite materials.

机译：生产siC晶须增强氧化铝复合材料的氧化铝涂层siC晶须的合成。

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Thick coatings of hydrated basic aluminum sulfate, an alumina precursor, were precipitated on the surfaces of SiC whiskers from an aqueous solution. These coatings were then thermally decomposed to obtain alumina coatings on the SiC whiskers. Both high aspect ratio as-received SiC whiskers and reduced aspect ratio whiskers were used as core particles in the coating process. SiC content in the composite powders was controlled by either varying the amount of SiC whiskers that were added to the original coating solution, or by using multiple coating steps in the original SiC core particles. Coated whiskers were characterized before and after calcination using Scanning Electron Microscopy and X-Ray Diffraction. Samples of these composite powders were hot-pressed at 1600(degree)C and 35 MPA pressure to obtain dense SiC whiskers-reinforced alumina composite materials. Polished surfaces of these composites were observed using optical microscopy and SEM to qualitatively analyze whisker distribution in the matrix and residual porosity in the material. In all composites using reduced aspect ratio whiskers, whisker distribution was uniform throughout the material, and residual porosity was very low. Fracture surfaces of some materials were observed in SEM, showing that a limited amount of whisker pull-out had occurred. 31 refs., 17 figs., 2 tabs.

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