CAJ | 학술논문

为分析大气等离子喷涂Al2O3-40%TiO2复合陶瓷涂层在冷却过程中涂层崩裂的现象，本文采用有限元方法，研究了涂层内部残余应力分布情况，探讨了涂层厚度、孔隙、裂纹等因素对残余应力的影响。结果表明：基体与粘结层和粘结层与涂层的界面边缘处出现了应力集中区域，随着X尺寸(模型水平方向的距离)的增加，涂层及粘结层内部应力由压应力转变为拉应力；涂层厚度只对残余应力值有影响，对应力分布状态影响较小，随着涂层厚度的增加，X向(径向)应力逐渐增加，Y向(轴向)应力及剪切应力在界面边缘处急剧变化；大孔隙、纵向裂纹对涂层残余应力影响较大。有限元模拟分析较好的解释了涂层在冷却过程中涂层层状崩裂的现象。
위분석대기등리자분도Al2O3-40%TiO2복합도자도층재냉각과정중도층붕렬적현상，본문채용유한원방법，연구료도층내부잔여응력분포정황，탐토료도층후도、공극、렬문등인소대잔여응력적영향。결과표명：기체여점결층화점결층여도층적계면변연처출현료응력집중구역，수착X척촌(모형수평방향적거리)적증가，도층급점결층내부응력유압응력전변위랍응력；도층후도지대잔여응력치유영향，대응력분포상태영향교소，수착도층후도적증가，X향(경향)응력축점증가，Y향(축향)응력급전절응력재계면변연처급극변화；대공극、종향렬문대도층잔여응력영향교대。유한원모의분석교호적해석료도층재냉각과정중도층층상붕렬적현상。
A method of finite element was used in order to analyze the phenomenon of coating cracking of atmospheric plasma spraying Al2O3-40%TiO2 composite ceramic coatings in the cooling process. The distribution of the internal residual stress of coating was studied and the influence of the factors such as coating thickness, porosity,crack on the residual stress was discussed. The results show that the stress concentration areas are occurred on the interface edge of the substrate with adhesive layer and the bonding layer with coating. The internal stress of coating and adhesive is transferred to tensile stress from compressive stress with the increase of X size. Compared with the state of stress distribution, the residual stress value is greatly affected by the coating thickness. With the increase of coating thickness, X stress increases gradually, Y stress and shear stress have rapid changes in the interface edge. Large porosity and longitudinal crack of coating have a greater influence on the residual stress. The phenomenon of coating layered cracking in the coating is better explained by finite element method in the cooling process.