文章信息/Info

Title:

Microstructure and Formation Mechanism of Chemical Vapor Deposition Aluminide Coating

文章編號:

1674-3962(2025)03-0275-07

作者:

孟國輝; 齊浩雄; 杜撰; 劉梅軍; 楊冠軍; 吳勇; 孫清云; 夏思瑤; 董雪

1. 西安交通大學 金屬材料強度國家重點實驗室，陜西 西安 710049 2. 武漢材料保護研究所有限公司，湖北 武漢 430030

Author(s):

MENG Guohui;  QI Haoxiong;  DU Zhuan;  LIU Meijun;  YANG Guanjun; WU Yong;  SUN Qingyun;  XIA Siyao;  DONG Xue

1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China 2. Wuhan Material Protection Research Institute Co., Ltd., Wuhan 430030, China

關鍵詞:

鎳基高溫合金; 化學氣相沉積; 鋁化物涂層; 微觀組織結構; 熱力學

Keywords:

nickel-based superalloy;  chemical vapor deposition;  aluminide coating; microstructure;  thermodynamic

分類號:

TG174.4

DOI:

10.7502/j.issn.1674-3962.202306014

文獻標志碼:

A

摘要:

提高鋁化物涂層抗高溫氧化和耐熱腐蝕性能的關鍵在于明確鋁化物涂層的微觀組織結構及形成機制。采用化學氣相沉積法在鎳基高溫合金Mar-M-247表面制備了鋁化物涂層。結合材料熱力學模擬軟件JMatPro和掃描電子顯微鏡表征并分析了鋁化物涂層的微觀組織結構及形成機制。結果表明，Mar-M-247高溫合金表面生成的鋁化物涂層具有雙層結構，外層由單一的β-NiAl相組成，內層主要由β-NiAl相、σ相和μ相組成。鋁化物涂層的外層β-NiAl相是Mar-M-247高溫合金大量Ni元素外擴散至合金表面，與環境中的Al元素反應生成的。從而使得高溫合金中的γ-Ni相和γ′-Ni3Al相含量減少。當Ni元素的體積分數分別降低至55%，52%和38%時，高溫合金中順序析出μ相、β-NiAl相和σ相。最終，當高溫合金中Ni元素的體積分數降低至32%時，高溫合金完全轉變為由β�睳iAl相、σ相、μ相和少量碳化物相MC組成的鋁化物內層。

Abstract:

The key to improve the resistance of aluminide coatings to high temperature oxidation and hot corrosion is to clarify the microstructure and formation mechanism of aluminide coatings. In this study, the aluminide coating was deposited on the surface of nickel�瞓ased superalloy Mar-M-247 by chemical vapor deposition. The microstructure and formation mechanism of aluminide coating were characterized and analyzed by using the material thermodynamics simulation software JMatPro and scanning electron microscope. The results showed that the aluminide coating on the surface of Mar-M-247 superalloy had a double layer structure, the outer layer consisted of a single β-NiAl phase, and the inner layer was mainly composed of β-NiAl phase, σ phase and μ phase. A large amount of Ni in Mar-M-247 superalloy diffused outwards to the surface of the alloy and reacted with Al in the environment to form the β-NiAl phase of outer layer of the aluminide coating. The contents of γ-Ni phase and γ-Ni3Al phase in superalloy were reduced due to the large outward diffusion of Ni element. When the volume fraction of Ni elements in the superalloy is reduced to 55%, 52% and 38%, respectively, the μ phase, β-NiAl phase and σ phase are sequentially precipitated in the superalloy. Finally, when the volume fraction of Ni in the superalloy is reduced to 32%, the superalloy is completely transformed into the inner layer of aluminide coating composed of β-NiAl, σ phase, μ phase and a small amount of carbide phase MC.