曹铁梁, 耿伟民, 倪政瑜, 周庆初, 潘辉英. 活化剂对Al-Cr扩散层中孔穴形成的影响[J]. 工程科学学报, 1996, 18(S2): 42-45. DOI: 10.13374/j.issn1001-053x.1996.s2.009
引用本文: 曹铁梁, 耿伟民, 倪政瑜, 周庆初, 潘辉英. 活化剂对Al-Cr扩散层中孔穴形成的影响[J]. 工程科学学报, 1996, 18(S2): 42-45. DOI: 10.13374/j.issn1001-053x.1996.s2.009
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Cao Tieliang, Geng Weimin, Ni Zhengyu, Zhou Qingchu, Pan Huiying. Influence of Activators on Formation of Voids in Aluminum-Chromium Diffusion Coatings[J]. Chinese Journal of Engineering, 1996, 18(S2): 42-45. DOI: 10.13374/j.issn1001-053x.1996.s2.009
Citation: Cao Tieliang, Geng Weimin, Ni Zhengyu, Zhou Qingchu, Pan Huiying. Influence of Activators on Formation of Voids in Aluminum-Chromium Diffusion Coatings[J]. Chinese Journal of Engineering, 1996, 18(S2): 42-45. DOI: 10.13374/j.issn1001-053x.1996.s2.009
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活化剂对Al-Cr扩散层中孔穴形成的影响

Influence of Activators on Formation of Voids in Aluminum-Chromium Diffusion Coatings

    摘要
  • 摘要: Ni衬底用粉末包装法先扩散Al再扩散Cr时,在Al-Cr扩散层内产生了孔穴。它形成的原因是:活化剂NH4Cl加热分解时生成HCl气体,与已形成扩散层中的Al作用,使其从扩散层中逃逸,而在原来Al的位置上产生了孔穴。含有孔穴的Al-Cr扩散层的抗氧化能力明显降低。

     

    Abstract: Aluminum-chromium diffusion coatings on pure nickel substrate were formed by two-step pack cementation process. It was found that existed many voids in the coatings which were formed by first aluminizing and then chromizing. It could be understood that aluminum in the coatings reacted with HCL gas decomposed from activator NH4CL and formed ACL3,which evaporated and resulted in formation of the voids.Oxidation resistance of Al-Cr coating with these voids was reduced signigicantly.

     

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