| 热喷涂TiB2-Ni复合涂层组织结构和力学性能 |
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| 引用本文： | 祝弘滨,李辉,栗卓新. 热喷涂TiB2-Ni复合涂层组织结构和力学性能[J]. 焊接学报, 2014, 35(11): 43-46 |
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| 作者姓名： | 祝弘滨 李辉 栗卓新 |
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| 作者单位： | 1.北京工业大学材料学院, 北京 100124;北京矿冶研究总院, 北京 100160 |
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| 基金项目： | 北京市自然科学基金重点资助项目 |
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| 摘 要： | 采用团聚烧结方法制备TiB2-Ni复合粉末喂料,并采用大气等离子喷涂和高速火焰喷涂两种喷涂方法制备了TiB2-Ni涂层,比较分析了两种涂层的显微组织、物相组成、孔隙率、硬度和断裂韧性.结果表明,与等离子喷涂相比,高速火焰喷涂制备的TiB2-Ni涂层具有更高的致密度,TiB2含量,硬度和断裂韧性.两种涂层中TiB2都没有发生明显的脱硼,氧化,但等离子喷涂过程中TiB2向金属相中发生了溶解生成了大量脆性Ni20Ti3B6相,并降低了涂层中TiB2的含量,这是涂层硬度和断裂韧性相对较低的主要原因.
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| 关 键 词： | TiB2-Ni涂层 大气等离子喷涂 高速火焰喷涂 Ni20Ti3B6 |
| 收稿时间： | 2013-04-17 |
Microstructure and mechanical properties of TiB2-Ni composite coating |
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| ZHU Hongbin,LI Hui and LI Zhuoxin. Microstructure and mechanical properties of TiB2-Ni composite coating[J]. Transactions of The China Welding Institution, 2014, 35(11): 43-46 |
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| Authors: | ZHU Hongbin LI Hui LI Zhuoxin |
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| Affiliation: | 1.School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;Mining and Metallargy Research Institute of Beijing, Beijing 100160, China2.School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | The TiB2-Ni composite powder feedstock was fabricated by agglomeration and sintering method. This powder was used to deposit TiB2-Ni coating by two thermal spray technologies, atmospheric plasma spray(APS) and high velocity oxygen fuel spray(HVOF). The microstructure, phase constitution, porosity, hardness and fracture toughness of two sprayed TiB2-Ni coatings were compared and analyzed. The results showed that the HVOF sprayed TiB2-Ni coating had more compact structure, larger TiB2 content, higher hardness and better fracture toughness than the APSed coating. The TiB2 in two coatings had no obviously deboronization and oxidation. However, the TiB2 in APS process was dissolved in metallic phase to form a large number of brittle Ni20Ti3B6 phases. This dissolution reaction reduced the TiB2 content in coating and it was the main reason for the lower hardness and worse fracture toughness of APSed TiB2-Ni coating. |
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| Keywords: | TiB2-Ni coating atmospheric plasma spray high velocity oxygen fuel spray Ni20Ti3B6 |
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