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首页> 外文期刊>Journal of Materials Engineering and Performance >Fabrication, Analysis of Microstructure and Oxidation Resistance of Cemented C/C Composites by Laser
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Fabrication, Analysis of Microstructure and Oxidation Resistance of Cemented C/C Composites by Laser

机译：用激光进行制造，分析水泥C / C复合材料的微观结构和抗氧化性

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摘要

Cylindrical carbon-carbon composites have been cemented using a CO2 laser actuated by a raster scanning mirror system in a four-step sequence. Complete and homogenous surface cementation as well as thermal stability of the composites was sought after and achieved. The line of heat created from the laser beam impinged parallel to the axis of the pre-coated cylinder, while suspended from one end and slowly rotated. Four slurry compositions, all containing chloride salts from refractory elements, some combined with silicon, were pre-deposited by air spraying it over each specimen and then laser treated sequentially. Confined heat sublimed the chlorine ions resulting in silicide compounds that reacted with the carbon substrate to form a bonding layer. Microstructure characterization was performed using scanning electron microscopy, energy-dispersive spectroscopy and x-ray diffraction, immediately after the cementation was consolidated and after heat treated under argon. Preliminary oxidation weight loss tests were performed up to 1423K under argon and air, revealing a 9.8 and 30.6% weight reduction, respectively, after 9h of exposure. Cemented specimens were then coated with a glass overcoat layer that allowed them to perform moderately better against oxidation achieving up to a 28% weight loss after 20h at 1273K in air.
机译：使用由光栅扫描镜系统致动的CO 2激光在四步序列中巩固圆柱形碳 - 碳复合材料。追求完整和均匀的表面粘合以及复合材料的热稳定性，并达到。从平行于预涂覆的圆柱体的轴线的激光束产生的热量，同时悬挂一端并缓慢旋转。四种浆料组合物，含有来自耐火元件的氯化物盐，一些与硅结合，通过将其喷射在每个样本上的空气预沉积，然后依次处理激光。限制热升华氯离子，得到与碳基材反应以形成粘合层的硅化物化合物。使用扫描电子显微镜，能量分散谱和X射线衍射进行微观结构表征，在固结后和氩气下热处理后立即进行。在氩气和空气下初步氧化重量损失试验在氩气和空气下进行1423K，分别在9小时后，减少9.8％和30.6％。然后用玻璃外涂层涂覆胶结样品，使其允许它们适度地更好地对氧化进行1273k在空气中达到20小时后的28％重量损失。

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