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投稿时间：2024-04-09 修订日期：2024-05-08
投稿时间：2024-04-09 修订日期：2024-05-08
中文摘要: 为提高大气等离子喷涂（APS）TiO2陶瓷涂层的结合强度及其摩擦磨损性能，采用喷雾造粒的纳米结构TiO2粉末为原料，利用APS工艺制备出TiO2陶瓷涂层，研究了涂层的显微组织、相组成、力学性能和摩擦磨损性能，并与常见的微米级TiO2粉末制备的陶瓷涂层组织性能进行了对比。结果表明，微米TiO2粉在喷涂前后相成分从板钛矿变为主为金红石和锐钛矿的混合相；而纳米团聚的TiO2粉喷涂前后无明显的相成分变化，均以金红石相为主。纳米TiO2涂层的孔隙率为1.4%，低于微米粉涂层的3.3%。纳米TiO2涂层的力学性能优于微米涂层，微米涂层硬度为934.2 HV0.1，而纳米涂层的硬度为1 349 HV0.1；纳米和微米涂层的弹性模量分别为203.1和185.8 GPa；纳米涂层的断裂韧性为2.1 MPa?m1/2，略高于微米涂层的2.0 MPa?m1/2；纳米涂层的结合强度可达46.8 MPa，是微米涂层的3.18倍（14.7 MPa）。此外，在相同的摩擦条件下，纳米TiO2涂层的摩擦因数为0.69，比微米TiO2涂层更低，纳米涂层的磨损体积也比微米涂层更少。综合来说，纳米TiO2涂层相对于微米级TiO2涂层体现出更好的综合力学性能。
Abstract:In order to improve the bond strength and frictional wear performance of atmospheric plasma sprayed (APS) TiO2 ceramic coatings, the nanocrystalline TiO2 powder produced by spray-dry technology was adopted as the raw material and the TiO2 ceramic coatings were prepare applying APS technology. The microstructure, phase composition, mechanical properties, and frictional wear behavior of the coatings were investigated and compared with ceramic coatings prepared using commercial sintered-crushed micro-scale TiO2 powder. The results show that the phase composition of the micro-scale TiO2 coating (MT) changes from an anatase phase to a mixture of rutile and brookite phases after the APS process. However, there is no significant phase composition change occurred for the nano-scale TiO2 coating (NT), which predominantly remains in the rutile phase. The porosity of the nano-scale coating is 1.4%, lower than that of the micro-scale coating (3.3%). The mechanical properties of the nanometer-scale coating are better than those of the micrometer-scale coating. The hardness of the micro-scale coating is 934.2 HV0.1, lower than that of the nano-scale coating (1 349 HV0.1). The elastic module of the micro- and nano-scale coatings are 185.8 GPa and 203.1 GPa, respectively. The fracture toughness of the nano-scale coating is 2.1 MPa?m1/2, which is also slightly higher than that of the micro-scale coating (2.0 MPa?m1/2). The bond strength of the nanometer-scale coating is 46.8 MPa, which is 3.18 times larger than that of the micro-scale coating (14.7 MPa). Furthermore, under the same sliding friction conditions, the friction coefficient of the nano-scale coating is 0.69, which is lower than that of the micro-scale coating. In addition, the comparison of friction volume data also favores the nano-scale coating over the micro-scale coating. In summary, TiO2 coatings produced from nanocrystalline powder exhibit superior comprehensive mechanical properties and friction resistance compared to those prepared from microcrystalline powder.
文章编号： 中图分类号：TG174.4 文献标志码：
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| 作者 | 单位 | |
| 马凤孝 | 北京工业大学 | mafx0302@163.com |
| 郭星晔* | 北京工业大学 | xyguo@bjut.edu.cn |
| 何翰伟 | 北京工业大学材 | |
| 吴旭 | 北京工业大学 | |
| 周正 | 北京工业大学 | |
| 贺定勇 | 北京工业大学 |
引用文本：
马凤孝,郭星晔,何翰伟,吴旭,周正,贺定勇.等离子喷涂高强韧纳米TiO2涂层的制备及其力学性能研究[J].热喷涂技术,2024,16(2):99-105.
MA Fengxiao,GUO Xingye,HE Hanwei,WU Xu,ZHOU Zheng,HE Dingyong.Preparation and Mechanical Properties Study of Air Plasma Sprayed High Strength and Toughness Nano-TiO2 Coatings[J].Thermal Spray Technology,202416(2):99-105.
马凤孝,郭星晔,何翰伟,吴旭,周正,贺定勇.等离子喷涂高强韧纳米TiO2涂层的制备及其力学性能研究[J].热喷涂技术,2024,16(2):99-105.
MA Fengxiao,GUO Xingye,HE Hanwei,WU Xu,ZHOU Zheng,HE Dingyong.Preparation and Mechanical Properties Study of Air Plasma Sprayed High Strength and Toughness Nano-TiO2 Coatings[J].Thermal Spray Technology,202416(2):99-105.