Analysis of deposits formation in plasma spraying with liquid precursors

作者：Shan, Y. G.^*; Wang, Y. L.; Coyle, T.

来源：Applied Thermal Engineering, 2013, 51(1-2): 690-697.

DOI：10.1016/j.applthermaleng.2012.09.039

• Plasma spraying
• Liquid precursors
• Deposits
• Forming mechanism

The coating deposited by plasma spraying with liquid precursors has nano- and submicron-metric features. Its microstructure highly depends on the injection history of the solution droplets. To increase the understanding of the formation mechanism of the deposits, a 3D model is applied to study the statistical characteristics of the trajectory and heating of the solution spray in a plasma jet. The temperature and size distributions of the particles upon impacting on the substrate are predicted. Individual deposits of precursor droplets or synthesized particles impacting on the substrate are collected experimentally. The deposits are classified into five types based on the computed temperature distribution and experimental observations: (1) melted or half-melted particles; (2) small sintered particles; (3) dry agglomerates; (4) wet agglomerates; and (5) wet droplets. The forming mechanism of each type is discussed.

• 出版日期2013-3
• 单位上海理工大学