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首页> 外文期刊>CERAMICS INTERNATIONAL >Effect of B_4C, MoSi_2, nano SiC and micro-sized SiC on pressureless sintering behavior, room-temperature mechanical properties and fracture behavior of Zr(Hf)B_2-based composites
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Effect of B_4C, MoSi_2, nano SiC and micro-sized SiC on pressureless sintering behavior, room-temperature mechanical properties and fracture behavior of Zr(Hf)B_2-based composites

机译：B_4C，MoSi_2，纳米SiC和微米级SiC对Zr（Hf）B_2基复合材料无压烧结行为，室温力学性能和断裂行为的影响

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摘要

In the present paper, ZrB_2-HfB_2 composite was developed via a pressureless sintering method and SiC, MoSi_2 and B_4C powders were used as additives. In order to produce composite samples, ZrB_2 is first milled for 2 h, afterwards the reinforcing particles were added. The mixture was formed by cold isostatic press (CIP) and, after the pyrolysis, it was sintered at 2100 °C and 2150 °C. In order to compare the effect of different additives on pressureless sintering behavior of ZrB_2-HfB_2 composite, the shrinkage percentage of samples was measured both before and after the sintering, and the microstructure of samples was examined using scanning electron microscopy (SEM), equipped with EDS spectroscopy. Bending test and resonance frequency method were used to measure the strength and the elastic modulus of the samples, respectively. The results show that samples containing MoSi_2 and SiC nanoparticles had the maximum flexural strength and elastic modulus. Moreover, the flexural strength and elastic modulus of the samples increased as the sintering temperature rose from 2100 °C to 2150 °C, suggesting that a temperature increase leads to an improved sintering process.
机译：本文采用无压烧结法制备了ZrB_2-HfB_2复合材料，并以SiC，MoSi_2和B_4C粉末作为添加剂。为了生产复合样品，首先将ZrB_2研磨2小时，然后添加增强颗粒。通过冷等静压机（CIP）形成混合物，并且在热解之后，将其在2100℃和2150℃下烧结。为了比较不同添加剂对ZrB_2-HfB_2复合材料无压烧结行为的影响，在烧结前后均测量了样品的收缩百分率，并使用配备有扫描仪的扫描电子显微镜（SEM）检查了样品的微观结构。 EDS光谱学。弯曲试验和共振频率法分别用于测量样品的强度和弹性模量。结果表明，含有MoSi_2和SiC纳米颗粒的样品具有最大的弯曲强度和弹性模量。此外，随着烧结温度从2100°C上升到2150°C，样品的抗弯强度和弹性模量增加，这表明温度升高导致烧结工艺改善。

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