Effect of process parameters on microstructure and properties of Ni60-Cu/BaF2·CaF2 directional structure coating

Abstract

Abstract: Ni60-Cu/BaF₂·CaF₂ directional structure composite coatings were prepared by a combination of oxyacetylene flame spraying + induction remelting + forced cooling. The effects of induction remelting parameters on the microstructure, element distribution and microhardness of Ni60-Cu/BaF₂·CaF₂ directional structure coatings were studied with a fixed Cu/BaF₂·CaF₂ content. The research shows that the low induction remelting power (7 kW) can not provide enough heat of fusion for the coating, and can not guarantee the complete melting state of the coating,the too high induction remelting power (15 kW) will provide excessive heat input, which will cause excessive diffusion of matrix elements to the coating, coarse microstructure and reduced hardness.When the induction remelting power is 10 kW, the directional structural coating obtains good microstructure,and the structure is dense and the columnar crystal is obvious, the metallurgical bonding zone between the coating and the substrate is relatively smooth, and the hardness value of the coating is higher.

Key words: nickel base alloy, BaF₂·CaF₂, directional structure, microstructure

CLC Number:

TG149

WANG Yi, YIN Xiang, ZHOU Kai, WANG Xin-min WANG Xin-hua, REN Jun-qiang. Effect of process parameters on microstructure and properties of Ni60-Cu/BaF₂·CaF₂directional structure coating[J]. Journal of Lanzhou University of Technology, 2022, 48(4): 11-18.

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Effect of process parameters on microstructure and properties of Ni60-Cu/BaF₂·CaF₂directional structure coating

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