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首页> 外文期刊>Journal of Materials Engineering and Performance >Mechanical properties of β-SiC fabricated by spark plasma sintering
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Mechanical properties of β-SiC fabricated by spark plasma sintering

机译：火花等离子体烧结制备β-SiC的力学性能

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The consolidation of SiC nanopowder synthesized by the mechanical alloying method was subsequently accomplished by spark plasma sintering of 1700 °C for 10 min under an applied pressure of 40 MPa. The SiC sintered compact with relative density of 98% consisted of nano-sized particles smaller than 100 nm. This phenomenon resulted in the ordering process of stacking disordered structure formed by mechanical alloying. In this work, the effect of grain size and relative density on the mechanical properties were studied. The mechanical properties of sintered compacts were evaluated and compared with the reference samples fabricated from the commercial SiC powder (β-SiC, 0.3 µm, IBIDEN Co., Gifu, Japan) with sintering additive (B–C mixture). The Vickers hardness and bending strength of those sintered compacts increased with the increment of the density. However, the mechanical properties were lower than those of reference samples in case of lower density, even though the mechanical property was close to that of reference sample in case of higher density. This phenomenon was considered for the difference of bond strength between grains because those sintered compacts were fabricated without any sintering additives, while those reference samples were fabricated by accelerating the grain bonding with a sintering additive of B–C mixture. In other words, those results indicated that the effect of sintering additive affected on mechanical properties directly.
机译：通过机械合金化方法合成的SiC纳米粉末的固结随后通过在40 MPa的压力下1700°C的火花等离子体烧结10分钟来完成。相对密度为98％的SiC烧结体由小于100 nm的纳米级颗粒组成。这种现象导致通过机械合金化形成的无序堆积结构的有序化过程。在这项工作中，研究了晶粒尺寸和相对密度对机械性能的影响。对烧结体的机械性能进行了评估，并将其与由商用SiC粉末（β-SiC，0.3 µm，IBIDEN Co.，岐阜，日本）与烧结添加剂（BC混合物）制成的参考样品进行了比较。这些烧结体的维氏硬度和弯曲强度随着密度的增加而增加。然而，即使在较高密度的情况下机械性能接近参考样品的机械性能，在较低密度的情况下机械性能也比参考样品的机械性能低。考虑到这种现象是由于晶粒之间的结合强度不同，因为这些烧结体是在没有任何烧结添加剂的情况下制成的，而那些参考样品是通过使用B-C混合物的烧结添加剂促进晶粒结合而制成的。换句话说，这些结果表明烧结添加剂的作用直接影响机械性能。

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