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首页> 外文会议>The 3rd International Symposium on Material Chemistry in Nuclear Environment (Material Chemistry '02 MC'02) Mar 13-15, 2002 Tsukuba >Microstructure of SiC Ceramics Fabricated by Pyrolysis of Electron Beam Irradiated Polycarbomethylsilane Containing Precursors
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Microstructure of SiC Ceramics Fabricated by Pyrolysis of Electron Beam Irradiated Polycarbomethylsilane Containing Precursors

机译：电子束辐照含前驱体的聚碳甲基硅烷热解制备SiC陶瓷的微观结构

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A modified gel-casting method was developed to form the ceramics precursor matrix by using polycarbomethylsilane (PCMS) and SiC powder. The polymer precursor was mixed with SiC powder in toluene, and then the slurry samples were cast into designed shapes. The pre-ceramic samples were then irradiated by 2.0MeV electron beam generated by a Cockcroft-Walton type accelerator in He gas flow to about 15MGy. The cured samples were pyrolyzed and sintered into SiC ceramics at 1300℃ in Ar gas. The modified gel-casting method leaves almost no internal stress in the pre-ceramic samples, and the electron beam curing not only diminished the amount of pyrolysis gaseous products but also enhanced the interface binding of the polymer converted SiC and the grains of SiC powder. Optical microscope, AFM and SEM detected no visible internal or surface cracks in the final SiC ceramics matrix. A maximum value of 122 MPa of flexural strength of the final SiC ceramics was achieved.
机译：开发了一种改进的凝胶浇铸法，通过使用聚碳甲基硅烷（PCMS）和SiC粉形成陶瓷前体基质。将聚合物前体与SiC粉在甲苯中混合，然后将浆料样品浇铸成设计形状。然后用Cockcroft-Walton型加速器在氦气流中产生的2.0MeV电子束辐照陶瓷前样品，使其达到约15MGy。固化后的样品在Ar气中于1300℃热解并烧结成SiC陶瓷。改进的凝胶浇铸法在陶瓷前样品中几乎没有内部应力，并且电子束固化不仅减少了热解气态产物的量，而且增强了聚合物转化的SiC与SiC粉颗粒的界面结合。光学显微镜，原子力显微镜和扫描电镜在最终的SiC陶瓷基体中均未发现可见的内部或表面裂纹。最终SiC陶瓷的抗弯强度最大值达到122 MPa。

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