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| SiO2添加剂对8%Y2O3稳定的ZrO2涂层热震前后表面形貌的影响 |
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李慕勤1,2, 马臣1, 谭伟3, 邵德春1, 郭面焕1
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1.哈尔滨工业大学 现代焊接生产技术国家重点实验室, 哈尔滨 150001;2.佳木斯大学 生物医学材料重点实验室, 佳木斯 154007;3.北京装甲兵工程学院, 北京 100072
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| 摘要: |
| 在8%Y2O3稳定的ZrO2陶瓷涂层中添加SiO2,使陶瓷涂层的抗热震性能得到提高,这主要是SiO2的加入使涂层抗热震前后的表面形貌发生了很大的变化。由于ZrO2与SiO2热膨胀系数不同,使涂层利于产生细微的网状裂纹,增加了微裂纹密度和孔隙,从而降低了涂层的弹性模量,释放了涂层中的应力,使涂层的抗热震失效能力得到提高。其中,SiO2加入量为3%(质量分数)效果最佳,过量的加入,会使孔洞加大,促进裂纹的扩展、断裂,不利于提高涂层的抗热震性能。 |
| 关键词: SiO2 陶瓷涂层 表面形貌 热震性 |
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| Influence of additive SiO2 on stable ZrO2+8%Y2O3 coatings of thermal shock |
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LI Mu qin1,2, MA Chen1, TAN Wei3, SHAO De chun1, GUO Mian huan1
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1.National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China;2.Biomedicine Material Key Lab, Jiamusi University, Heilongjiang Jiamusi 154007, China;3.The Institute of Armored Force Engineering, Beijing 100072, China
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| Abstract: |
| The thermal shock resistance of coating was increased by adding SiO2 to the stable ZrO2+8%Y2O3 layer due to the difference of thermal expansion coefficient between SiO2 and ZrO2,which facilitated the formation of reticular microcracks and increased the density of the microcracks,as well as the elastic module of the coating was decreased and the internal stress in coating layer was released,too.The experimental results show that optimum amounts of SiO2 were 3wt%.When excessive SiO2 was added,the big cave could formed,which facilitated microcracks expending and fracture,as well as the thermal shock resistance of the coating was damaged,too. |
| Key words: SiO2 coating thermal shock resistance |
