FORMATION OF NITRIDE PHASES IN THE NITRIDING OF POROUS IRON

被引:0
作者
GORBACH, VG
MESHASHTI, S
MOSKALENKO, YN
机构
[1] Kiev Polytechnic Inst
来源
SOVIET POWDER METALLURGY AND METAL CERAMICS | 1991年 / 30卷 / 04期
关键词
Heat Treatment - Nitriding - Iron and Alloys--Sintering - Porous Materials--Surface Properties - Protective Coatings--Mechanical Properties;
D O I
10.1007/BF00795957
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
When sintered iron with a certain porosity (14-20%) is saturated with nitrogen, the amount of absorbed N2 and the depth of the nitride layer increase jumpwise. If we regard the porous material as a biphase mixture (of pores and iron particles), such a phenomenon can be associated with the jumpwise increase of the effective diffusion coefficient at a certain quantitative ratio of the phases (the so-called percolation effect of diffusion). When porous iron is nitrided, a peculiar morphological form of the nitride phases forms in the diffusion layer; this, in distinction to the acicular nitrides, which are typical of the nitriding of compact iron, has a comparatively equiaxial shape and sinuous phase boundaries. © 1991 Plenum Publishing Corporation.
引用
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页码:283 / 286
页数:4
相关论文
共 3 条
  • [1] Fedorchenko I.M., Pugina L.N., Composite Sintered Antifriction Materials [in Russian], (1980)
  • [2] Gorbach V.G., Kanovskii, Nitsovich V.M., Udovitskii V.I., Phase transitions and percolation diffusion in the process of thermodiffusional saturation of multicomponent materials, Dokl. Akad. Nauk Ukr. SSR, Ser. A, 1, pp. 71-74, (1987)
  • [3] Belous M.V., Moskalenko, Permyakov V.G., The magnetic properties of iron nitrides, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 10, pp. 75-78, (1969)