DEVELOPMENT AND CHARACTERIZATION OF SiC-Al2O3-Al CERAMIC MATRIX NANOCOMPOSITE POWDER

作者：Karbasi Maryam; Razavi Mehdi; Azadi Mina; Tayebi Lobat^*

来源：Nano, 2013, 8(6): 1350059.

DOI：10.1142/S1793292013500598

• Nanomaterials
• nanocomposite
• ceramic matrix composites
• mechanical alloying

In this study, SiC-Al2O3-Al ceramic matrix nanocomposite powder was successfully synthesized employing mechanical alloying technique, through mechanochemical reaction among Silicon dioxide (SiO2), Carbon (C) and Aluminum (Al). For the commercial purposes, the materials (SiO2, C and Al powders) and also the method of synthesis (mechanical alloying) is considered to be cost effective for the production of SiC-Al2O3-Al nanocomposite. Addition of alumina (Al2O3) and aluminum to silicon carbide (SiC) in a nancomposite form can improve the fracture toughness, strength and fatigue crack resistance of SiC and make it a leading material for many commercial applications specially by considering the cost-effective method of production. The structural evaluation of powder particles after different milling times was conducted by X-ray diffractometry (XRD), and scanning electron microscopy (SEM). The results showed that during ball milling the SiO2, C and Al reacted with a combustion mode producing SiC-Al2O3-Al nanocomposite after 24 h ball milling and annealing at the temperature of 920 degrees C. The crystallite sizes of phases remained in nanometric scale after annealing at 920 degrees C for 1 h. Based on our investigation, it was revealed that ball milling and annealing process decreases the temperature of reaction between SiO2 and C from 1500 degrees C to 920 degrees C.

• 出版日期2013-12