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| 摘要: |
| 热喷涂层由扁平粒子组成，呈层状结构。气孔不可避免地存在于涂层中，而这些气孔包括通常所指的微米级气孔以及亚微米级的气孔。亚微米级气孔由扁平粒子间的未结合界面和扁平陶瓷粒子内所产生的显微裂纹构成。业已开发成功陶瓷涂层的电镀技术，并利用电镀的钢在涂层断面上的分布，揭示热喷涂Al2O3涂层的的真实气孔结构的方法。该方法的最重要之处在于直观地揭示热喷涂层的扁平陶瓷粒子间的未结合界面。本论文将电镀技术应用于传统的等离子、低气压等离子以及爆炸喷涂法喷制的Al2O3涂层，用扁平粒子间平均结合率和扁平粒子的平均厚度为结构参数定量地评价涂层结构。考察热喷涂方法对扁平粒子间结合的影响。 |
| 关键词: 热喷涂,Al_2O_3,涂层,结构,层间结合,电镀铜 |
| DOI： |
| 分类号:TG174 |
| 基金项目: |
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| Effect of Spray Method on the Lamellar Structure of Al_2O_3 Coatings |
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Chang Jiu Li
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| Abstract: |
| A thermally sprayed coating consists of flattened Particles and has a layer structure. Porosity is inevitably formed in a coating, which inciudes the usually referred pores of micron order size and those of sub -micron size of pores consist of nonbonded interface area between flattened particles and those gap area fron microcracks occurred in individual flattened ceranic particles. A electro-plating technique hasbeen developed to reveal the real pore structure of thermally sprayed Al2O3 coatings assisted by the distribution of copper electroplated into the coatings. The most significant aspect of Such technique is to reveal visually the nonbonded interface area between flattened ceramic particles in a flame sprayed coating.In the present paper, the electroplating technique is applied to Al2O3 coatings sprayed by conventional plasma spraying, low pressure plasma spraying and detonation gun spraying to characterize quantitatively the coating structure using such structural parameters as mean lamellar bonding ratio and mean thickness of flattened particles. The effect of spraying methods on the lamellar bonding between flattened particles is examined. |
| Key words: Thermal spraying Al_2O_3 coating Structure Lamellar Bonding Copper Electroplating |
