PM Functional Materials: Case Study of the Process of Sintering and Heat Treatment of Stainless Soft Magnetic Material Attained through Mechanical Alloying

• Published in: European Congress and Exhibition on Powder Metallurgy. European PM Conference Proceedings Vol. 4; p. 1
• Main Authors: Dovydenkova, A V, Dovydenkov, V A, Yaltayev, V P, Yarmolyk, M V
• Format: Conference Proceeding
• Language: English
• Published: Shrewsbury The European Powder Metallurgy Association 01.01.2004

We studied sintering of soft magnetic powder alloys Fe-Cr produced through mechanical mixing of iron and chrome powders and after treatment the mix in the attritor, energy being 5 kWt/h per 1kg of the product. Soft magnetic materials of this type have optimum correlation of magnetic induction and coercive force under a definite grain size provided by heat treatment. The treatment of the mix in a high energy attritor activates sintering and shortens the time of homogenization of the alloy under sintering from 180 to 60 minutes. We studied how dispersion phases formed under mechanical alloying influence the grain size in the process of heat treatment. It was defined that under sintering within temperatures of 1150 - 1250°C dispersion phases (Cr2O3 Cr23C6) disappear. Kinetics of grain growth in the material produced through mechanical alloying is similar to that of the materials produced through long-term sintering of mixes. Material obtained through optimum conditions under magnetizing force of 2,500 A/m has induction Bs=1.38 T and coercive force Hc=61 A/m [PUBLICATION ABSTRACT]