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陶瓷颗粒增强型金属基复合涂层在诸多工业领域都有需求,其中包括炼钢工业。本文中,MCr Al Y-Al2O3复合粉末通过球磨法制备,并且通过等离子喷涂、超音速火焰喷涂和冷喷涂分别制备了MCr Al Y-Al2O3复合涂层。实验结果显示,可以选用不优先使基体与Al2O3结合的复合粉末控制涂层中的Al2O3含量。涂层粉末的微结构在冷喷涂涂层和超音速火焰喷涂涂层中得到了良好的保留,这是因为喷涂粒子未熔化或部分熔化。然而,对于等离子喷涂的涂层,大多数Al2O3颗粒被隔离在层状界面,在条状界面上形成连续的氧化皮。经退火处理后,由元素扩散引起的条状界面的强化使得超音速火焰喷涂和大气等离子喷涂的涂层硬度增大。此外,冷喷涂涂层由于退火后加工硬化效果的消除,硬度增加不像超音速火焰喷涂和等离子喷涂涂层那样明显。
Ceramic particle reinforced metal matrix composite coatings are in demand in many industries, including the steelmaking industry. In this paper, MCr Al Y-Al2O3 composite powders were prepared by ball milling, and MCr Al Y-Al2O3 composite coatings were prepared by plasma spraying, supersonic flame spraying and cold spraying respectively. The experimental results show that it is possible to use a composite powder that does not preferentially bond the matrix with Al 2 O 3 to control the Al 2 O 3 content in the coating. The microstructure of the coating powder is well preserved in cold sprayed coatings and supersonic flame sprayed coatings because the sprayed particles are not melted or partially melted. However, for plasma sprayed coatings, most of the Al 2 O 3 particles are isolated at the lamellar interface, forming a continuous scale on the lamellar interface. After annealing, strengthening of the strip interface due to elemental diffusion results in increased hardness of the supersonic flame spray and atmospheric plasma spray coating. In addition, cold sprayed coatings are not as markedly increased in hardness as supersonic flame sprayed and plasma sprayed coatings due to the elimination of work hardening after annealing.