Wetting Behaviors of Pure Nickel and Nickel-Based Alloys on Sintered ZrB₂-SiC Ceramics

Abstract:

The wetting and spreading behaviors of pure nickel and nickel based alloys on sintered ZrB₂-SiC ceramics and their interfacial microstructures were investigated in this presentation. The nickel-based alloys were mainly the commercial nickel-molybdenum-chromium products. The wetting and spreading properties were observed by a real-time thermal optical measurement system under flowing argon-5%hydrogen atmosphere. As temperature increased, the pure nickel cylinder sample on ZrB₂-SiC substrate had few changes before 1228°C except for the thermal expansion in size. After that, liquid phase formed and spread gradually on the ceramic substrate. The contact angle was about 15^o after holding 15min at 1600°C. Therefore, pure nickel could contact sintered ZrB₂-SiC ceramics well. Meanwhile, the introduction of molybdenum and/or chromium in the pure nickel was beneficial for the wetting of nickel on sintered ZrB₂-SiC ceramics. The contact angles of Ni-28Mo and Ni-16Mo-23Cr alloys on sintered ZrB₂-SiC ceramics after 1600°C/15min were 13^o and 2^o, respectively. In addition, the temperatures of the liquid drop formed rose obviously in contrast to the pure nickel. The SEM images indicated that the interfacial microstructures of Ni-based alloys on sintered ZrB₂-SiC ceramic substrates were uniform and the dissolved boundaries showed that they had a good bonding. However, some cracks were found in the Ni/ZrB₂-SiC system for their high thermal mismatch. On the other hand, the Ni-Mo (-Cr)/ZrB₂-SiC interface had few defections and evident elemental diffusion between the ceramic substrates and the alloys were found at the interface.

• Periodical: Key Engineering Materials (Volume 655)
• Pages: 72-77
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.655.72
• Online since: July 2015
• Authors: Hui Zhang*, Han Qin Liang, Yong Jie Yan, Yan Liu, Xue Jian Liu, Zheng Ren Huang
• Keywords: Microstructure, Nickel-Based Alloy, Wetting, ZrB₂-SiC Ceramics

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