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VACUUM ›› 2023, Vol. 60 ›› Issue (2): 30-33.doi: 10.13385/j.cnki.vacuum.2023.02.05

• Thin Film • Previous Articles     Next Articles

Effect of Diffusion Treatment on Structure and Hardness of Low Temperature Pack Cementation Aluminizing Coatings

ZHAO Wen-jun1,2, LIU Yu-zhuo1,2, CAI Yan1,2, WANG Li-zhe1,2, LI Jian-ping1,2, MU Ren-de1,2, HE Li-min1,2   

  1. 1. Beijing Institute of Aeronautical Material, Beijing 100095, China;
    2. Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, Beijing 100095, China
  • Received:2022-05-20 Online:2023-03-25 Published:2023-03-27

Abstract: Aluminizing coating was prepared by pack cementation method on the surface of K418B superalloy, then it was diffused at 1080℃ for 4h under vacuum. Cross-section microstructure, coating composition, main element distribution, phase structure and hardness of the samples before and after diffusion treatment were characterized by SEM/EDS, EPMA/EDS, XRD and Vickers hardness tester. The results show that diffusion treatment is benefit to interdiffusion of elements in the coating. After the diffusion treatment, the thickness of coating increases from 53.37μm to 95.14μm, the main phase composition of the coating is transformed from ε-Al3Ni phase to β-NiAl phase, the Vickers hardness decreases from 450HV0.01 to 350HV0.01, and a tightly bonded interdiffusion zone which can enhance the structural stability of the system is formed between the coating and the substrate.

Key words: pack cementation aluminizing, coating, Vickers hardness, diffusion treatment

CLC Number: 

  • TG174.4
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