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原位自生NbC陶瓷增强铁基复合材料研究
Study on In-situ NbC Ceramic Reinforced Iron Matrix Composites
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- DOI:
- 作者:
- 魏俊哲 白海强 许云华
WEI Junzhe;BAI Haiqiang;XU Yunhua
- 作者单位:
- 西安理工大学材料科学与工程学院
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
- 关键词:
- 原位反应 铁基复合材料 NbC/Fe陶瓷层 显微硬度
in-situ reaction iron matrix composites NbC/Fe ceramic layer microhardness
- 摘要:
- 采用原位反应与两步法热处理结合方法,使铌丝提供的铌原子与灰口铸铁中石墨提供的碳原子发生原位自生反应,制备了NbC增强铁基复合材料。采用XRD、SEM、TEM等检测手段对复合材料的物相组成与组织结构进行分析,利用显微硬度计对复合材料进行硬度与显微压痕形貌及压痕裂纹分析。结果表明,通过原位反应成功制备了NbC增强铁基复合材料,该复合材料的主要物相组成为α-Fe、Nb、NbC、G。NbC/Fe陶瓷层的厚度约为242±3μm,NbC/Fe陶瓷层与Nb丝、铁基体之间呈现良好的冶金结合。NbC陶瓷颗粒形貌为标准的立方体,NbC/Fe陶瓷层的显微硬度是铁基体的3~4倍。NbC reinforced iron matrix composite was prepared by in-situ reaction of niobium atoms supplied by niobium wire and carbon atoms supplied by graphite in gray cast iron. XRD, SEM, TEM and other detection methods were used to analyze the phase composition and structure of the composites, and the hardness, micro-indentation morphology and indentation crack of the composites were analyzed by means of microhardness tester. The results show that NbC reinforced iron matrix composites were successfully prepared by in-situ reaction. The main phase composition of the composites isα-Fe, Nb, NbC, G. The thickness of NbC/Fe ceramic layer is about 242 ±3 microns, which shows good metallurgical bonding between NbC/Fe ceramic layer, Nb wire and iron matrix. The morphology of NbC ceramic particles is a standard cube, and the microhardness of NbC/Fe ceramic layer is 3~4 times that of iron matrix.