(05)SINTERING THERMODYNAMICS OF IRON-BASED MATERIALS CONTAINING THE SOLID LUBRICANT MOLYBDENUM DISULFIDE

摘要

Iron and steel are the most used metals around the world and molybdenum disulfide (MoS_2) one of the most used solid lubricant. Therefore it is expected that one might try to develop self-lubricating steels containing MoS_2. However MoS_2 reacts with steel matrices during sintering. To be able to develop solutions for maintain the solid lubricant stable it is necessary to understand the thermodynamics aspects of these reactions. In this paper, the influence of powder particle size, matrix composition and MoS_2 content in the reaction process is covered. The results showed that the reaction occurs at lower temperatures than those predicted and that the MoS_2 stability over temperature and resulting sulfides are altered according to the initial composition but also by the addition of some alloying elements that changes the chemical potential.