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首页> 外文期刊>Materials & design >Reaction behaviour, microstructure and mechanical properties of TiC-TiB_2/Ni composite fabricated by pressure assisted self-propagating high-temperature synthesis in air and vacuum
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Reaction behaviour, microstructure and mechanical properties of TiC-TiB_2/Ni composite fabricated by pressure assisted self-propagating high-temperature synthesis in air and vacuum

机译:空气和真空中压力辅助自蔓延高温合成TiC-TiB_2 / Ni复合材料的反应行为,显微组织和力学性能

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摘要

The dense TiC-TiB_2/Ni composite was successfully fabricated via a simple route where the pressure assisted self-propagating high-temperature synthesis (SHS) was directly ignited at 625 ℃ with the incorporation of air. The ignition temperature in air was much lower than that in vacuum (1040 ℃). The composites made in air possessed the similar phase constituents and microstructure as well as comparable mechanical properties to those made in vacuum. The ignition temperature both in air and vacuum showed a significant dependence on Ni content and reactant particle size while the reaction products only showed a dependence on Ni content and B_4C particle size, irrespective of Ti particle size. The density of the composite made in air and vacuum only depended on Ni content while the mechanical properties of the composites made in air and vacuum both showed a similar dependence on the Ni content and reactant particle size.
机译:通过一种简单的方法成功地制备了致密的TiC-TiB_2 / Ni复合材料,该方法通过引入空气在625℃下直接点燃压力辅助自蔓延高温合成(SHS)。空气中的着火温度远低于真空中的着火温度(1040℃)。空气中制成的复合材料具有与真空中相似的相组成和微观结构,以及相当的机械性能。空气和真空中的着火温度均显着依赖于Ni含量和反应物粒径,而反应产物仅依赖于Ni含量和B_4C粒径,而与Ti粒径无关。在空气和真空中制成的复合材料的密度仅取决于Ni含量,而在空气和真空中制成的复合材料的机械性能均显示出对Ni含量和反应物粒径的相似依赖性。

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