| Autor: |
Ageeva, V. S., Pugina, L. I., Fedorchenko, I. M., Paderno, V. N., Korkh, L. M., Berezovskaya, O. A. |
| Zdroj: |
Powder Metallurgy and Metal Ceramics; June 1977, Vol. 16 Issue: 6 p474-479, 6p |
| Abstrakt: |
1.A study was made of the densification kinetics characterizing the sintering of sulfidized iron-graphite bearing materials under pressure. It is shown that the presence of free graphite and sulfur, added in the elemental form or as a metallic sulfide, in porous iron leads to the formation of a liquid phase — a sulfide-carbide eutectic — which intensifies the process of densification of the material.2.The nature of the metallic component of the sulfide affects the densification kinetics, rate of shrinkage, density, and structure of graphite-containing porous iron. Thus, a marked inhibition of shrinkage is observed: when a high degree of alloying of the matrix of the material is attained, for example, in the presence of an antimony sulfide addition; when carbides are formed at grain boundaries, as is the case with tungsten or molybdenum sulfide addition; in the presence of a bismuth sulfide addition. The last-mentioned sulfide decomposes with the liberation of the metal at grain boundaries, which prevents diffusion of carbon into the iron, thereby promoting the formation of a ferritic structure in the material. |
| Databáze: |
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