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Effects of particle size on coatings for hollow spherical zirconia powder

机译：粒径对空心球形氧化锆粉末涂料的影响

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摘要

As a new material of thermal barrier coatings in aero-engine,hollow sphere-shaped zirconium oxide powder has the higher performance in fluidity,fusibility and deposit efficiency compared with the solid random-shaped zirconia,which makes the coatings pos sess more closed-pores,better thermal-resistant effect,moderate tenacity and stronger oxidation-resistant ability with less defects such as unmelted particles and through-holes. In the process of plasma spray,the particle size distribution of hollow spherical zirconia is the most important factor for spraying performance and coating quality when the powders already hold the regular sphere shape and certain degree of hollowness. This paper has investigated the powder properties of many kinds of particle size distribution for hollow spherical zirconia,and the bond strength,metallographic structure and porosity of corresponding coatings as well as deposit efficiency of powders have been tested to analyze the effect of particle size distribution for spraying performance and coating quality. Then the effort of distributing these powders correctly has been paid to find out the scheme with better integrated performance.
机译：中空球形氧化锆粉末作为航空发动机隔热涂层的一种新型材料，与固体无定形氧化锆相比，在流动性，可熔性和沉积效率方面具有更高的性能，这使得该涂层具有更大的闭孔性具有更好的耐热效果，中等强度和较强的抗氧化能力，并减少了诸如未熔化的颗粒和通孔等缺陷。在等离子喷涂过程中，当粉末已经具有规则的球形形状和一定程度的空心度时，空心球形氧化锆的粒度分布是影响喷涂性能和涂层质量的最重要因素。本文研究了中空球形氧化锆的多种粒度分布的粉末特性，并测试了相应涂层的结合强度，金相结构和孔隙率以及粉末的沉积效率，以分析粒度分布对纳米氧化锆的影响。喷涂性能和涂层质量。然后，人们付出了正确分配这些粉末的努力，以找到具有更好综合性能的方案。

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