The IUP Journal of Mechanical Engineering
SEM and Fractography Analysis of SiCp/Al2O3 Ceramic Matrix Composites Prepared Through Directed Metal Oxidation Process of Al Alloy

Article Details
Pub. Date :Nov, 2018
Product Name : The IUP Journal of Mechanical Engineering
Product Type : Article
Product Code : IJME21809
Author Name : Malkapuram Devaiah
Availability : YES
Subject/Domain : Management
Download Format : PDF Format
No. of Pages : 13

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Abstract

Ceramic Matrix composites (CMCs) of Al2O3 as matrix reinforced with Silicon carbide particulate composites with varying SiC volume faction were fabricated using DIrected Metal OXidation (DIMOX) process. Continuous oxidation of Al-8.5Si-1.5Mg-9Zn alloy in the presence SiC performed with suitable dopants led to the formation of the Al2O3 matrix. SiC reinforced Al2O3 matrix, ceramic matrix composites microstructural details and fracture behavior after fracture test have been discussed using Scanning Electron Microscope (SEM). The surface fracture of the broken fracture sample was observed under SEM. The paper made SEM studies on the composites prepared using directed metal oxidation process. Extra phases other than matrix and reinforcement could be observed clearly with the help high resolution offered by an electron microscope unlike an optical microscope. An Al-Zn-Si-Mg oxidized at 950 oC to 980 oC in air produced composite with 1-2 um channels at an average growth rate of 0.25 mm/h. However, the experimental observations revealed that the growth rate increased with increase in particle size. The fracture of SiC/Al2O3 composites was found to be brittle in nature.


Description

Ceramics have excellent strength-to-weight ratio when compared to advanced metals and alloys. Ceramic materials have properties that make them ideal candidates for many elevated temperature applications such as heat exchangers and turbine engine components. Due to the refractory nature of ceramics, they are, at times, the only choice for a material that can potentially satisfy the most demanding requirements, particularly at high temperatures. In addition to offering high melting or decomposition temperatures, many ceramics possess other attractive features such as low density, high temperature strength, high hardness and resistance to creep deformation, thermochemical stability and lack of reactivity in contact with other materials and various atmospheres, and, last, but not least, high wear resistance. Table 1 shows the properties of structural ceramics. Fracture toughness, the resistance to the propagation of a fine crack is low for ceramics and this renders ceramics sensitive to sudden catastrophic failure in response to accidental overloading, contact damage or rapid temperature changes.


Keywords

Ceramic Matrix Composites, Al2O3, SiC, SEM, Fractography

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