利用大气等离子喷涂工艺制备了A1203—13％TiO2（质量分数，简称AT13）及添加不同含量La2O3的陶瓷涂层，通过X射线衍射仪和扫描电镜对涂层的显微结构进行了分析，采用正态和Weibull分布统计分析方法研究了涂层的显微硬度分布，并用块一环磨损试验研究了涂层的干滑动摩擦磨损行为。结果表明：Laz03改善了AT13涂层层片之间的结合，且不会使涂层的主相发生变化；添加La203对AT13涂层的显微硬度没有明显影响，但使硬度分布的分散性降低，涂层的耐磨性能得到明显提高，尤以含质量分数6％La2O3的最佳，磨损机制为脆性剥落磨损和粘着磨损。
The ceramic coatings of Al2O3-13wt% TiO2 （AT13） and AT13 with different contents of La2O3 were prepared by atomosphere plasma spraying. Microstructure of the coatings were analyzed by XRD and SEM. The microhardness distribution was studied by normal and Weibull statistical analysis, dry sliding friction and wear behavior was investigated by a friction and wear testing machine in a pin-on-ring mode. The results indicate that the addition of La2O3 improved the combination between splats in the coating and did not result in the change of constitute phase in the coating. The addition of La2O3 had no obvious effect on the microhardness, but reduced the scatter of microhardness distribution in the coating, the wear resistance of AT13 coating with the addition of La2O3 was evidently enhanced. The best wear resistance of the coating and the minimum scatterness of microhardness data were obtained when the content of La2O3 was 6wt%. The wear mechanism was predominantly attributed to the brittle spalling and adhesive wear.
参考文献
| [1] | R. Yilmaz;A.O. Kurt;A. Demir .Effects of TiO_2 on the mechanical properties of the Al_2O_3-TiO_2 plasma sprayed coating[J].Journal of the European Ceramic Society,2007(2/3):1319-1323. |
| [2] | 孙永兴,王引真,何艳玲.稀土氧化物添加剂对Al2O3等离子喷涂层的影响[J].材料保护,2001(06):8-9. |
| [3] | Y. Liu;Y. F. Gao;S. Y. Tao;X. M. Zhou;W. D. Li;H. J. Luo;C. X. Ding .Microstructure of Plasma Sprayed La{sub}2O{sub}3-Modified YSZ Coatings[J].Journal of Thermal Spray Technology,2008(5/6):603-607. |
| [4] | Zhenyu Zhang;Xinchun Lu;Jianbin Luo .Tribological properties of rare earth oxide added Cr_3C_2-NiCr coatings[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2007(9):4377-4385. |
| [5] | Tian, W;Wang, Y;Yang, Y;Li, CG .Toughening and strengthening mechanism of plasma sprayed nanostructured Al2O3-13 wt.%TiO2 coatings[J].Surface & Coatings Technology,2009(5):642-649. |
| [6] | Zhenyu Zhang;Zhiping Wang;Bunv Liang .Microstructure and Dry-Sliding Wear Behavior of Thermal Sprayed and Fused Ni-Based Coatings with the Addition of La_2O_3[J].Tribology letters,2010(2):141-148. |
| [7] | 林新华 .等离子喷涂纳米结构氧化铝-3wt.﹪氧化钛涂层的制备及表征[D].中国科学院上海硅酸盐研究所,2003. |
| [8] | Thompson AM.;Chan HM.;Harmer MP.;Williams DB.;Chabala JM. Levisetti R.;Soni KK. .DOPANT DISTRIBUTIONS IN RARE-EARTH-DOPED ALUMINA[J].Journal of the American Ceramic Society,1997(2):373-376. |
| [9] | 马臣,李慕勤,邵德春,刘克勇,郭面焕.CeO2对等离子喷涂Al2O3涂层抗热震性的影响[J].中国稀土学报,1998(02):143. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%