王如转,罗春希,李定玉,邢安,贾碧,李卫国.可计及温度与层状结构影响的超高温陶瓷基复合材料涂层残余热应力理论表征模型[J].表面技术,2019,48(1):43-48.
WANG Ru-zhuan,LUO Chun-xi,LI Ding-yu,XING An,JIA Bi,LI Wei-guo.Theoretical Characterization Model for the Residual Thermal Stress in Ultra-high Temperature Ceramic Matrix Composite Coatings under Effects of Temperature and Laminated Structures[J].Surface Technology,2019,48(1):43-48 |
| 可计及温度与层状结构影响的超高温陶瓷基复合材料涂层残余热应力理论表征模型 |
| Theoretical Characterization Model for the Residual Thermal Stress in Ultra-high Temperature Ceramic Matrix Composite Coatings under Effects of Temperature and Laminated Structures |
| 投稿时间：2018-10-31 修订日期：2019-01-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.01.006 |
| 中文关键词: 超高温陶瓷基复合材料涂层 残余热应力 热不匹配 温度 层状结构 理论模型 |
| 英文关键词:ultra-high temperature ceramic matrix composite coatings residual thermal stresses thermal mismatch tem-perature laminated structures theoretical model |
| 基金项目:国家自然科学基金项目（11602044，11602043）；重庆市自然科学基金项目（cstc2017jcyjAX0158） |
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| Author | Institution |
| WANG Ru-zhuan | 1.Chongqing University of Science and Technology, Chongqing 401331, China |
| LUO Chun-xi | 1.Chongqing University of Science and Technology, Chongqing 401331, China |
| LI Ding-yu | 1.Chongqing University of Science and Technology, Chongqing 401331, China |
| XING An | 1.Chongqing University of Science and Technology, Chongqing 401331, China |
| JIA Bi | 1.Chongqing University of Science and Technology, Chongqing 401331, China |
| LI Wei-guo | 2.Chongqing University, Chongqing 400030, China |
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| 中文摘要: |
| 目的 创建可计及温度与层状结构共同影响的超高温陶瓷基复合材料涂层与基体层因热不匹配导致的残余热应力的理论表征模型。方法 基于经典的层合板理论与超高温陶瓷基复合材料热物理性能参数对温度的敏感性研究，引入温度和层状结构对涂层与基体层所受残余热应力的影响，形成各层残余热应力温度相关性的理论表征方法，并以ZrB2-SiC复合材料涂层为例，利用该理论方法系统地研究了各种控制机制对残余热应力的影响及其随温度的演化规律。结果 超高温陶瓷基复合材料涂层与基体层所受的残余热应力随着温度的变化而变化，涂层热膨胀系数与基体层热膨胀系数差别越大，变化幅度越大。当涂层材料热膨胀系数大于基体层材料热膨胀系数时，涂层材料遭受残余拉应力，基体层材料遭受残余压应力；随着涂层厚度的增加，涂层所受拉应力减小，而基体层所受压应力增大；当涂层材料热膨胀系数小于基体层材料热膨胀系数时，涂层材料遭受残余压应力，基体层材料遭受残余拉应力；随着涂层厚度的增加，涂层所受压应力减小，而基体层所受拉应力增大。低温下，各层所受残余热应力对层厚与每层材料组成的变化比较敏感，随着温度的升高，敏感性降低。结论 对于涂层材料，应设计涂层材料的热膨胀系数小于基体层材料的热膨胀系数，使涂层遭受残余压应力，这不仅能够降低材料表面产生裂纹的危险，同时可以抑制表面已有缺陷的扩展。同时应当设计相对较小的涂层厚度，以增大涂层所受的残余压应力，降低基体层所受的残余拉应力，有效提高整体材料在不同温度下的强度性能。 |
| 英文摘要: |
| The work aims to build a theoretical characterization model for residual thermal stresses due to thermal mismatch between the ultra-high temperature ceramic matrix composite coatings under the effects of temperature and laminated structure and the matrix layer. Based on the classical lamination theory and the sensitivities of thermo-physical properties parameters of ultra-high temperature ceramic matrix composites to temperature, the combined effects of temperature and laminated structures were introduced into the residual thermal stress of coating and matrix layer to form the theoretical characterization method for temperature-dependent residual thermal stress. ZrB2-SiC composite coatings were taken as example to study the effects of varieties of control mechanisms on the residual thermal stresses and the evolutions with temperature in detail by the theoretical method. The residual thermal stresses in the ultra-high temperature ceramic matrix composite coatings and the matrix layer changed with the variation of temperature. The bigger the difference between the thermal expansion coefficients of coating and matrix layer was, the greater the range of variation was. When the thermal expansion coefficient of coatings was bigger than that of the matrix layer, the coatings suffered from the residual tensile stresses, and the matrix layer suffered from the residual compressive stress. With the increase of thickness of coating, the residual tensile stresses in coating decreased, while the residual compressive stress in matrix layer increased. When the thermal expansion coefficient of coatings was smaller than that of the matrix layer, the coatings suffered from the residual compressive stresses, and the matrix layer suffered from the residual tensile stress. With the increase of thickness of coating, the residual compressive stresses in coating decreased, while the residual tensile stress in matrix layer increased. At low temperature, the residual thermal stresses in the coatings and matrix layer were sensitive to temperature, while the sensitivities decreased as the temperature increased. Therefore, the thermal expansion coefficient of the coating should be designed to be smaller than that of the matrix layer, as to make the residual compressive stress in the coating. This can not only reduce the danger of the formation of surface flaw of materials, but also restrain the propagation of the existing surface flaw. Additionally, the relative smaller thickness of the coatings can be designed. This can increase the residual compressive stress in coatings and decrease the residual tensile stress in matrix layer, leading to the effective improvement of strength performance of the monolithic materials under different temperatures. |
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