The main production defects typical for ceramic-matrix composites (CMC) with an SiC matrix prepared by liquid-phase siliciding are formulated: bulk and surface CMC cementation, nonuniformity of the siliciding process, degradation of carbon and SiC fibers due to molten Si, the presence of microcracks, open and closed pores, and internal cracking and swelling of the final CMC. Reasons for their occurrence are analyzed and it is shown that most of the defects are the result of complex physicochemical and thermophysical phenomena accompanying the basic modifications of this technology. Practical recommendations are formulated for the main production defects to prevent them or minimize their impact on the operational characteristics of the final material. The requirement for special studies to optimize the composition of semi-finished products and regimes for all stages of the production processes with the aim of preparing CMC with minimum defects and the best performance properties is demonstrated

中文翻译：

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液相硅化制备SiC基质的陶瓷复合材料的发生，性质和减少生产缺陷的方法分析

阐述了采用液相硅化法制备的具有SiC基体的陶瓷基复合材料（CMC）的典型主要生产缺陷：本体和表面CMC胶结，硅化工艺的不均匀性，由于熔融硅导致的碳和SiC纤维降解，存在微裂纹，开孔和闭孔以及最终CMC的内部开裂和膨胀。对其产生的原因进行了分析，结果表明，大多数缺陷是伴随该技术的基本修改而产生的复杂的物理化学和热物理现象的结果。针对主要生产缺陷制定了实用建议，以防止或最大程度地减少对最终材料操作特性的影响。