孟君晟,吉泽升.氩弧熔覆原位自生TiN-TiB2/Ni涂层组织表征及反应机制[J].稀有金属材料与工程,2018,47(1):13~19.[Meng Junsheng,Ji Zesheng.Microstructure and formation mechanism of in-situ TiN-TiB2/Ni Coating by argon arc cladding[J].Rare Metal Materials and Engineering,2018,47(1):13~19.]
氩弧熔覆原位自生TiN-TiB2/Ni涂层组织表征及反应机制
投稿时间:2016-02-02  修订日期:2016-07-04
中文关键词:  氩弧熔覆  TiN-TiB2  显微组织  形成机制  耐磨性
基金项目:国家科技攻关计划
中文摘要:
      采用氩弧熔覆技术,选择不同的BN/Ti摩尔比,在35CrMnSi钢表面原位合成了TiN-TiB2增强Ni基涂层;利用XRD、SEM和TEM等方法分析了涂层的显微组织和结构特征.试验结果表明,在BN/Ti摩尔比大于0.33时,熔覆组织主要由TiN, TiB2, TiB, Cr23C6和γ-Ni组成;随着BN/Ti摩尔比的增加,针状的TiB逐渐消失而棒状TiB2颗粒增多,且颗粒均匀细小;通过计算表明在试验温度下熔覆层中增强相的形核驱动力由大到小依次顺序为TiN-TiB2-TiB;探讨了Ti-BN-Ni体系中增强相的形成机制,当BN/Ti摩尔比为0.67时,熔覆层具有较高的平均硬度及优良的干滑动磨损性能。
Microstructure and formation mechanism of in-situ TiN-TiB2/Ni Coating by argon arc cladding
英文关键词:argon arc cladding  TiN-TiB2  microstructure  formation mechanism  wear resistance
英文摘要:
      An in situ synthesis method was developed to produce a Ni alloy composite coating reinforced by in situ reacted TiN and TiB2 particles using argon arc cladding (AAC) with different molar ratio of BN/Ti on a 35CrMnSi steel substrate. The microstructures of the clad coatings were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the phases of the coating were TiN, TiB2, TiB, Cr23C6 and γ-Ni. As the BN/Ti ratio increased, the needle-like TiB phase almost disappears and the number of rod-like TiB2 particles increased. Their shape became smaller. The computed results shows that the nucleation driving force of the major reinforcing phases from low to high was TiN-TiB2-TiB at different test temperatures. Moreover, the growth mechanism of the phases is discussed in the Ti-BN-Ni system. The BN/Ti molar ratio was 0.67 showed the highest average micro-hardness and excellent wear resistance at the room temperature under normal atmosphere conditions.
作者单位E-mail
孟君晟 材料科学与工程学院 mengjs2008@163.com 
吉泽升 材料科学与工程学院  
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