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用等离子在45#碳钢上喷涂了不同涂层设计的Al2O3以及Al2O3+130mg·g-1TiO2陶瓷层.用X-射线衍射法和拉伸实验测量了涂层表面层中的残余应力及结合强度.增加粘结层和过渡层能大大地克服陶瓷涂层与基材机械的以及热的不匹配性,使涂层的应力和结合强度都得到明显改善.此外,SiO2能改善ZrO2陶瓷层与基材以及陶瓷层内部的结合程度,使涂层内应力松弛并使其结合强度提高.然而SiO2添加剂只有在高熔点陶瓷层中(如ZrO2),"液相烧结"作用才明显,而在熔点较低的陶瓷层中(如Al2O3),这种作用并不明显.在用等离子喷涂低熔点Al2O3陶瓷时,添加适量的低熔点TiO2陶瓷是必要的.
Different layers of Al2O3 and Al2O3 + 130mg · g-1TiO2 ceramic were sprayed on 45 # carbon steel with plasma. The residual stress and bonding strength in the coating surface layer were measured by X-ray diffraction and tensile tests. Adding the adhesive layer and the transition layer can greatly overcome the ceramic coating and substrate mechanical and thermal mismatch, so that the coating stress and bonding strength are significantly improved. In addition, SiO2 can improve the bonding between the ZrO2 ceramic layer and the substrate and the interior of the ceramic layer, relax the stress in the coating and increase the bonding strength. However, SiO2 additive is only obvious in “liquid phase sintering” only in high melting point ceramic layers (such as ZrO2), while in the lower melting ceramic layers (such as Al2O3), this effect is not obvious. In plasma spraying low melting point Al2O3 ceramic, adding appropriate amount of low melting point TiO2 ceramic is necessary.