Thermodynamic Analysis of Pressureless Sintering of B4C-Si Nano Composite by Factsage Software

Subject Areas : journal of New Materials

M. سعیدی حیدری ¹ , H. بهاروندی ² , N. احسانی ³

1 - دانشجوی کارشناسی ارشد مهندسی مواد مرکب، دانشگاه صنعتی مالک اشتر تهران.
2 - دانشیار مجتمع مواد و فناوری‌‌های ساخت، دانشگاه صنعتی مالک اشتر تهران.
3 - استاد مجتمع مواد و فناوری‌‌های ساخت، دانشگاه صنعتی مالک اشتر تهران.

Received: 2014-02-05 Accepted : 2014-02-05 Published : 2014-05-22

Keywords: Factsage, Nano Composite, Boron Carbide, silicon, Pressureless Sintering,

Abstract :

In this article, pressureless sintering of B₄C-Si nano composite has been investigated. At first before beginning any laboratory operation and by using Factsage and HSC softwares, the free energy changes of reactions and the ability to reaction was examined. Then composition containing 2.5-10 wt% Si placed under uniaxial pressing and pressureless sintered at 2200°C. To evaluate the physical and mechanical properties of specimens, determination of density, micro-hardness, young modulus and fracture toughness were carried out. Also to study the microstructure of samples, microscopic images were taken by SEM. The results of the experiments showed that maximum properties were obtained for the sample containing 7.5 wt% Si which was 92% relative density, 32.2 GPa hardness, 308.45 GPa elastic modulus and 4.09 MPa.m^1/2 fracture toughness.