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Microstructure and Mechanical Properties of Si3N4-Fe3Si Composites Prepared by Gas-Pressure Sintering

机译：气体压力烧结制备的Si3N4-Fe3Si复合材料的组织和力学性能

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Si3N4-Fe3Si composites were prepared using Fe-Si3N4 as the source of Fe3Si by gas-pressure sintering. By adding different amounts of Fe-Si3N4 into the starting powders, Si3N4-Fe3Si composites with various Fe3Si phase contents were obtained. The microstructure and mechanical properties of the composites were investigated. With the increase of Fe-Si3N4 contents, the content and particle size of Fe3Si both increased. When more than 60 wt. % Fe-Si3N4 were added, the abnormal growth of Fe3Si particles occurred and oversized Fe3Si particles appeared, leading to non-uniform microstructures and worse mechanical properties of the composites. It has been found that Fe3Si particles could toughen the composites through particle pull-out, interface debonding, crack deflection, and particle bridging. Uniform microstructure and improved mechanical properties (flexural strength of 354 MPa and fracture toughness of 8.4 MPa·m1/2) can be achieved for FSN40.
机译：通过气压烧结使用Fe-Si3N4作为Fe3SI的来源制备Si3N4-Fe3Si复合材料。通过将不同量的Fe-Si3N4加入到起始粉末中，获得具有各种Fe3SI相含量的Si3N4-Fe3Si复合材料。研究了复合材料的微观结构和机械性能。随着Fe-Si3N4内容的增加，Fe3Si的含量和粒度都增加。超过60重量％。加入％Fe-Si3N4，发生Fe3Si颗粒的异常生长和出现过大的Fe3Si颗粒，导致非均匀的微观结构和复合材料的机械性能差。已经发现Fe3Si颗粒可以通过颗粒拉出，接口剥离，裂缝偏转和颗粒桥接来强化复合材料。对于FSN40，可以实现均匀的微观结构和改进的机械性能（354MPa的弯曲强度和8.4MPa·M1 / 2的断裂韧性）。

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