文献类型：会议论文

英文题名：A controlled new process of pack aluminization

作者：Huang, ZR; Ma, LB; Li, PN; Xu, H

机构：[1]E China Univ Sci & Technol, Sch Mech Engn, Shanghai 200237, Peoples R China

会议论文集：14th Congress of the International-Federation-for-Heat-Treatment-and-Surface-Engineering

会议日期：OCT 26-28, 2004

会议地点：Shanghai, PEOPLES R CHINA

语种：英文

外文关键词：pack aluminization; controlled aluminization; aluminized steels

摘要：Aluminum diffusion coatings are often prepared by a pack aluminization technique, which is a specific variety of chemical vapor deposition (CVD) method. The coating process takes place in a bed containing a mixed powder that serves as a source of the coatings forming element. The phase composition of the diffusion layer obtained depends on the activity of the Al during the pack aluminization processing. In this work, the proportion of Al to special additive powder in the pack and the treatment temperature are adjusted to achieve the desired surface composition of aluminized layer. The aluminized 20 plain carbon steel and HK40 austenitic steel were investigated by optical microscopy (OM), X-ray diffraction (XRD) and microsclerometer. The results showed that the desired FeAl, Fe3Al and NiAl were respectively formed on the 20 plain carbon steel and HK40 austenitic steel, and the alummides FeAl3, Fe2Al5 or Ni2Al3, NiAl3 could be inhibited.