等离子喷涂氧化铝涂层的热震性能及微观组织特征
Thermal Shock Resistance and Microstructure Character of Alumina Coatings Fabricated by Plasma Spraying
马东林1, 贺 毅1, 王 兰1, 徐心洁2
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作者单位：(1. 西华大学 材料学院, 四川 成都610039; 2. 成都飞机工业(集团)有限责任公司 制造工程部, 四川 成都 610091)
中文关键字：团聚颗粒； 特征喷涂参数； 热震性能； 双模结构
英文关键字：reconstructed particle; CPSP; thermal shock resistance; bimodal microstructure
中文摘要：以团聚氧化铝复合颗粒为原料，采用等离子喷涂法，变化特征喷涂参数(CPSP)，在Q235钢表面制备陶瓷涂层。对制备的涂层进行热震性能测试，并用扫描电镜和X射线衍射仪分析粉末和热震性能较优涂层的微观结构和相组成特征。结果表明：随特征喷涂参数(CPSP)值的上升，热震循环次数先增大后降低；以适中的特征喷涂参数(CPSP=750 A·V/L·min-1)制备的陶瓷涂层，热震循环次数最大；其微观结构为典型的双模结构，由部分熔化区和完全熔化区组成；涂层中主要物相为γ-Al2O3、α-Al2O3和Al2TiO5。
英文摘要：Using reconstructed Al2O3 particle as raw materials, ceramic coatings were deposited on Q235 steel surface by plasma spraying at different critical plasma spray parameters (CPSP). The thermal shock resistance of the coating was tested, the microstructure morphologies and phase constitute of the powder and the coating with superior thermal shock resistance were detected by SEM and XRD. The results show that as the value of critical plasma spray parameters (CPSP) increase, the thermal shock times increase at first and then decrease. At moderated CPSP value (et. CPSP=750A·V/L·min-1), the thermal shock resistance of the coating is best of all. The microstructure morphology of the coating deposited at moderated CPSP condition is typical bimodal microstructure which consists of partial melted region and full melted region. And the phase in the coating mainly consists of γ-Al2O3, α-Al2O3 and Al2TiO5.