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首页> 外文期刊>Key Engineering Materials >Microstructure and Mechanical Properties of Hot-Pressed Silicon Carbide Fiber-Reinforced Silicon Carbide Composite
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Microstructure and Mechanical Properties of Hot-Pressed Silicon Carbide Fiber-Reinforced Silicon Carbide Composite

机译：热压碳化硅纤维增强碳化硅复合材料的组织和力学性能

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摘要

continuous 2D woven SiC fiber-reinforced SiC composites were fabricated by hot-pressing at 1650-1750 deg. C under a pressure of 40 MPa using Al2O3-Y2O3-CaO system as sintering additives. Bulk density of the composites with non-coated Hi-Nicalon decreased with lowerinig sintening temperature, whereas that of the composites with BN-coated Hi-Nicalon did not show much difference. The fracture behavior of the composites with non-coated Hi-Nicalon hot-pressed at 1700 or 1750 deg. C showed slight ductility with short fiber pull-out, whereas the composites with BN-coated Hi-Nicalon showed completely brittle fracture. In the case of composites hot-pressed at 1650 deg. C, the load-displacement curves showed ductile fracture regardless of with/without BN-coating on the fibers. Generally, BN has a low chemically-active nature, however, the sinterability of the composites increased with the presence of BN in the composites.
机译：通过在1650-1750度下热压制备连续的2D编织SiC编织纤维增强SiC复合材料。使用Al2O3-Y2O3-CaO体系作为烧结添加剂，在40 MPa的压力下加热C。未涂覆Hi-Nicalon的复合材料的体积密度随初始灼烧温度的降低而降低，而具有BN涂覆Hi-Nicalon的复合材料的体积密度没有太大差异。非涂层Hi-Nicalon在1700或1750度下热压的复合材料的断裂行为。 C表现出轻微的延展性，短纤维拔出，而具有BN涂层的Hi-Nicalon的复合材料表现出完全脆性断裂。对于复合材料，在1650度下热压。 C，无论纤维上有无BN涂层，载荷-位移曲线均显示出韧性断裂。通常，BN具有低的化学活性性质，但是，随着复合物中BN的存在，复合物的烧结性增加。

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