引用本文:王杨， 朱嘉琦， 代兵， 高鸽， 杨磊.SiO2涂层热循环过程中损伤与脱落的试验表征[J].中国表面工程,2015,28(3):42~48
WANG Yang, ZHU Jiaqi, DAI Bing, GAO Ge, YANG Lei.Experimental Characterization of Damage and Spallation of SiO2 Coatings During Thermal Cycling Process[J].China Surface Engineering,2015,28(3):42~48
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SiO2涂层热循环过程中损伤与脱落的试验表征
王杨， 朱嘉琦， 代兵， 高鸽， 杨磊
哈尔滨工业大学 复合材料与结构研究所
摘要:
为了解可能导致SiO2陶瓷涂层损伤和脱落的因素，从而有针对性地提出减缓涂层损伤与脱落的方法，延长涂层的寿命，采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、原子力显微镜(AFM)、Raman光谱等表征手段, 对利用溶胶凝胶法制备的SiO2涂层，在温度范围为250~450 ℃，经历0、10、30、50次热循环试验后表、界面形貌、结构和化学键变化情况进行了表征和描述。结果表明，随着热循环次数增加, 涂层表面和内部产生了裂纹并发生扩展, 表面粗糙度(Ra)增加到727.3 nm, 某些区域还出现了颗粒撞击和气泡状破损导致的损伤。同时界面逐步开裂、脱层、钝化, 涂层表面和内部出现了局部烧结、晶粒细化、内应力释放、微观应变增加等现象, 这些都是导致其损伤乃至脱落的诱因。
关键词:  SiO2涂层  热循环试验  损伤脱落  裂纹扩展  界面钝化
DOI：10.11933/j.issn.1007-9289.2015.03.007
分类号:
基金项目:
Experimental Characterization of Damage and Spallation of SiO2 Coatings During Thermal Cycling Process
WANG Yang, ZHU Jiaqi, DAI Bing, GAO Ge, YANG Lei
Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080
Abstract:
To know the factors for the damage and spallation of SiO2 coatings, a method was put forward to slow the damage and spallation of the coatings, and to extend the life of the coatings. Scanning electron microscope (SEM), Xray diffraction (XRD), atomic force microscope (AFM), Raman spectroscopy and some other characterization methods were used. SiO2 coatings were prepared by solgel method. At 250450 ℃, after 0, 10, 30 and 50 thermal cycles, respectively, changes in surface and cross section morphologies, structures and chemical bonds of damaged SiO2 coatings during the thermal cycling process are characterized and described. The results show that as the number of cycles increases, cracks generate and propagate on the surface of and in the coatings, with the roughness (Ra) going up to 727.3 nm. There are also damage and spallation caused by particles striking or bubblelike caves in some regions. Meanwhile, the interface gradually cracks, delaminates and passivates. Some phenomena on the surface of and in the coatings, such as partial sintering, grain refinement, stress release and microstrains increasing, are also observed. These are all the causes for the damage and spallation of the coatings.
Key words:  SiO2 coatings  thermal cycling  damage and spallation  crack propagation  interface passivation
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