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首页> 外文期刊>International Journal of Microstructure and Materials Properties >Formation of Zr(C,N)-ZrB_2 composite powders by self-propagating high-temperature synthesis (SHS)
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Formation of Zr(C,N)-ZrB_2 composite powders by self-propagating high-temperature synthesis (SHS)

机译：通过自蔓延高温合成（SHS）形成Zr（C，N）-ZrB_2复合粉末

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摘要

Zirconium carbide, nitride and diboride arc ceramic materials suitable for use at high temperatures requiring resistance to wear, oxidation and corrosion. ZrC and ZrN have isotypical lattices and arc completely soluble in each other forming zirconium carbonitride.rnIn this study zirconium carbonitride-zirconium diboride composite powders were produced by self-propagating high-temperature synthesis (SHS) from zirconium, hexagonal boron nitride, carbon and boron powders. The ratio of ZrC/ZrN in the Zr(C,N) solid solutions were varied by changing the C and h-BN amount in the reactants. Reaction products were analysed by powder X-ray diffraction. Lattice parameters of ZrC-ZrN solid solutions were determined and they were seen to increase with increasing C content in the structure. Adiabatic temperatures of the reactions were calculated by the HSC software. Grain size and morphology of the reactants and products was examined by scanning electron microscopy. Partial fusion of the grains was observed in some of the products, indicating that the actual temperatures attained at the reaction front were close to the melting points of the products. The grains of the product phases had irregular shape.
机译：碳化锆，氮化物和二硼化物弧形陶瓷材料适合在要求耐磨，抗氧化和抗腐蚀的高温下使用。 ZrC和ZrN具有同型的晶格，彼此完全溶解，形成碳氮化锆。rn在这项研究中，碳氮化锆-二硼化锆复合粉末是通过自蔓延高温合成（SHS）由锆，六方氮化硼，碳和硼制成的粉末。通过改变反应物中C和h-BN的量来改变Zr（C，N）固溶体中ZrC / ZrN的比例。通过粉末X射线衍射分析反应产物。确定了ZrC-ZrN固溶体的晶格参数，并发现它们随着结构中C含量的增加而增加。通过HSC软件计算反应的绝热温度。通过扫描电子显微镜检查反应物和产物的晶粒尺寸和形态。在某些产物中观察到颗粒的部分熔融，表明在反应前沿达到的实际温度接近产物的熔点。产物相的晶粒具有不规则形状。

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