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Microstructures and Mechanical Behavior of Ti3SiC2/Al2O3-Ni Composites Synthesized by Pulse Discharge Sintering

机译:脉冲放电烧结合成的Ti3SIC2 / Al2O3-Ni复合材料的微观结构和力学行为

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摘要

High-purity Ti3SiC2 and Ti3SiC2/Al2O3-Ni composites with different Al2O3-Ni contents were fabricated using pulse discharge sintering (PDS) of a mechanical alloyed powder mixture. The synthesis process of monolithic Ti3SiC2 was studied through displacement temperature-time (DTT) curve, displacement rate-time and displacement rate-temperature diagrams obtained during the PDS process. It was found that TiC (x) and Ti5Si3C (y) are the intermediate phases and the PDS process completed after 20 min at 1350 A degrees C. The results showed that in Ti3SiC2/Al2O3-Ni composite, the Ni part of Al2O3-Ni leads to decomposition of Ti3SiC2 to TiC (x) , Ti5Si3C (y) and Ni(Si) (x) . No evidence was detected in the reaction between Al2O3 and Ti3SiC2. The density and hardness of the composites are higher than monolithic Ti3SiC2 due to the production of reinforcing phases. The composite showed lower flexural strength and higher compressive strength than monolithic Ti3SiC2.
机译:使用机械合金粉末混合物的脉冲放电烧结(PDS)制造具有不同Al 2 O 3-Ni含量的高纯度Ti3SIC2和Ti3 SiC2 / Al2O3-Ni复合材料。 通过位移温度 - 时间(DTT)曲线,位移率 - 时间和位移率 - 温度图研究了单片Ti3SIC2的合成过程。 发现TiC(X)和Ti 5 Si 3C(Y)是中间相,在1350℃下20分钟后完成的PDS方法。结果表明,在Ti3SIC2 / Al2O3-Ni复合材料中,Al2O3-Ni的Ni部分 导致Ti3SIC2的分解为TiC(x),Ti5Si 3C(Y)和Ni(Si)(x)。 在Al 2 O 3和Ti3SIC2之间的反应中没有检测到证据。 由于增强相的产生,复合材料的密度和硬度高于单片Ti3SIC2。 复合材料显示出低于整体Ti3 SIC2的弯曲强度和更高的抗压强度。

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