| The Applicability of Combustion Synthesis Process to the Fabrication of MoSi2-SiC Composites Manadana Adeli1; Amir Tayebi Pak2; 1SCHOOL OF METALLURGY AND MATERIALS ENGINEERING, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Tehran, Iran; 2IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Tehran, Iran; PAPER: 278/Nanomaterials/Regular (Oral) SCHEDULED: 17:50/Sat. 26 Oct. 2019/Coralino ABSTRACT: Combustion synthesis is a novel low-cost, rapid, and energy-saving method for the production of high-temperature materials. The synthesis of products via this method is based on the formation of the desired compounds by making use of the exothermic reactions between the starting elemental powders. In this study, the synthesis of MoSi<sub>2</sub>-SiC composites from the starting powder mixture of Mo+2Si and Si+C has been investigated. XRD, SEM-EDS, and Vickers microhardness tests have been used to characterize the products. The effect of Mo+2Si/Si+C weight ratio on the intensity of the reaction, as well as the formation of the products, was studied. It was found out that the desired products were formed in Mo+2Si powder mixtures containing 10wt.%Si+C samples. Using higher amounts of Si+C resulted in incomplete reactions which gave rise to remains of unreacted powder particles in the product microstructure. The MoSi<sub>2</sub>-10wt.%SiC composite showed the highest values of mircrohardness References: 1. M. Panneerselvam, Ankur Agrawal, K.J. Rao, "Microwave sintering of MoSi2-SiC composites", Materials Science and Engineering A356 (2003) 267-273. 2. Jianguang Xu, Huiqiang Li, Haijiang Wu, Fangling Lei, Preparation of MoSi<sub>2</sub>/SiC composite by mechanical-assistant combustion synthesis method, Journal of Alloys and Compounds, 487 (2009) 326-330. 3. Subrahmanyam Jandhyala, "Thermochemical Evaluation of Combustion Synthesis of MoSi,-Sic Composites" J. of the American Ceramic Society, vol. 76 (1993) 226-228. |
