Microstructure and performance of functionally gradient Ti(C, N)-based cermets fabricated by low-pressure carburizing treatment during liquid phase sintering

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• 作者：Yijie Zhao^a ; Yong Zheng^a ; ^{zy_msc@nuaa.edu.cn} ; Wei Zhou^a ; Jiajie Zhang^a ; Guotao Zhang^a ; Weihao Xiong^b
• 关键词：Graded Ti(C ; N)-based cermets ; Low-pressure carburizing treatment ; Microstructure ; Hardness ; Surface
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：1956-1962
• 全文大小：1452 K
• 卷排序：43

文摘

Functionally graded Ti(C, N)-based cermets were prepared by a cost-effective and environment-friendly procedure which combined vacuum sintering with low-pressure carburizing treatment during liquid phase sintering stage in one cycle. The prepared cermets were investigated using scanning electron microscope (SEM), energy dispersive X-ray analysis (EDX), electron probe microanalysis (EPMA) and X-ray diffraction (XRD), which revealed that a considerable thick nickel-deficient layer was introduced due to the fast diffusion of carbon inwards at 1400 °C. Moreover, the thickness of binder-deficient layer of graded cermets gradually increased with increasing carburizing time, but the amplitude of deficient nickel of the original surface dramatically decreased. Typically, Ti(C, N)-based cermets carburized for 40 min possessed a 600 µm deep nickel-deficient layer, and showed excellent mechanical properties with surface hardness of 1753−73+62 HV and TRS of 2092−146+117 6 MPa.