为了提高传统Al_2O_3+40%TiO_2等离子喷涂层的力学性能,将纳米结构的ZrO_2粉末引入热喷涂层,采用液相喷雾造粒的方法将纳米ZrO_2-准微米级Al_2O_3/TiO_2颗粒团聚成适用于等离子喷涂的微米级粉体,并用等离子喷涂技术制备出含有纳米结构的陶瓷涂层.利用X射线衍射仪、扫描电镜和显微硬度计等对涂层的微观结构和性能进行了检测.结果表明,最佳喷涂功率40 kW下制备的纳米陶瓷涂层的显微硬度和韧性比传统涂层有了明显提高.
Al_2O_3- TiO_2- ZrO_2 composite coatings containing nanostructured ZrO_2 were prepared by using plasma spraying, where nano ZrO_2 particulates mixed with submieron Al_2O_3/TiO_2 particulates were pelletized in liquid phase to generate desired feedstock powders. The microstrocture and mechanical properties of the resulting composite ceramic coatings were analyzed by means of X-ray diffraction, scanning electron miercseopy, and hardness measuremem. Results show that the coatings containing nanostructured ZrO_2 have considerably higher microhardness and toughness than conventional coatings.
参考文献
| [1] | Anstis G R;Chantikul P;Rlawn B et al.A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness:Ⅰ.Direct Crack Measurements[J].Journal of the American Ceramic Society,1981,64:533. |
| [2] | Jianning Ding;Yonggang Meng;Shizhu Wen .Mechanical properties and fracture toughness of multilayer hard coatings using nanoindentation[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2000(1/2):178-182. |
| [3] | Chela H;Zhou X M;Ding C X .Investigation of the thermal mechanical properties of a plasma-sprayed nanestructured zirconia coating[J].Journal of the European Ceramic Society,2003,23:1 449-1 455. |
| [4] | Leon L. Shaw;Daniel Goberman;Ruiming Ren;Maurice Gell;Stephen Jiang;You Wang;T. Danny Xiao;Peter R. Strutt .The dependency of microstructure and properties of nanostructured coatings on plasma spray conditions[J].Surface & Coatings Technology,2000(1):1-8. |
| [5] | Ostojic P;Mc Pherson R.Indentation toughness testing of plasma sprayed coatings[J].Materials Forum,1987(10):247-254. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%