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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Boron Content on Microstructure, Mechanical Properties, and Oxidation Resistance of Mo-Si-B Composites
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Effect of Boron Content on Microstructure, Mechanical Properties, and Oxidation Resistance of Mo-Si-B Composites

机译：硼含量对Mo-Si-B复合材料的微观结构，力学性能和抗氧化性的影响

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摘要

Mo-Si-B composites with boron content from 0 to 8wt.% were prepared by spark plasma sintering using Mo, Si, and B elemental powders. The effects of boron content on the phase composition, mechanical properties, and high-temperature oxidation resistance of the Mo-Si-B composites were investigated. The results show the evolution of the major phase constitution of the composites with increasing boron content is in the following sequence: (MoSi2, Mo5Si3)(MoSi2, Mo5Si3, Mo5SiB2)(MoSi2, MoB)(MoSi2, MoB, MoB2). As the boron content increases, both the hardness and flexural strength of the composites increases, but the fracture toughness of the composites gradually decreases. The strengthening mechanisms for the composites are second-phase strengthening and grain refinement strengthening. However, the formation of brittle phases, i.e., Mo5SiB2, MoB, and MoB2, reduces the toughness of the composites. In addition, since a dense barrier layer of SiO2-B2O3 formed on the surface of the composites inhibits the inward diffusion of oxygen, B-doped Mo-Si-B exhibits better oxidation resistance compared with non-doped composites.
机译：Mo-Si-B复合材料，硼含量为0至8wt。通过使用Mo，Si和B元素粉末的火花等离子体烧结制备％。研究了硼含量对Mo-Si-B复合材料的相组成，机械性能和高温氧化性的影响。结果表明，随后的序列：（MOSI2，MO5SI3，MO5SIB2（MOSI2，MOM）（MOSI2，MOM，MOM2，MOSI2，MOM）（MOSI2，MOM，MOM2）（MOSI2，MOM，MOM2）（MOSI2，MOM，MOB2）中的主要相体构成的演变是下列序列：（MOSI2，MO5SI3，MO5SIB2）。随着硼含量的增加，复合材料的硬度和弯曲强度均增加，但复合材料的断裂韧性逐渐降低。复合材料的强化机制是二相强化和晶粒细化强化。然而，脆性相的形成，即MO5SIB2，MOB和MOB2，降低了复合材料的韧性。另外，由于在复合材料表面上形成的SiO 2-B2O3的致密阻挡层抑制氧的向内扩散，与非掺杂复合材料相比，B掺杂的Mo-Si-B表现出更好的抗氧化性。

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