Introduction and literature review
1.1 Research Background
A ceramic is an earthy material usually of silicate nature and may be defined as a combination of one or more metals with a non-metallic element usually oxygen. The American ceramic society (1986) had defined ceramics as inorganic non-metallic materials, which are typically crystalline in nature, and are compounds formed between metallic and non-metallic elements. Common examples are; silica – (SiO2) the main ingredient in most glass products; alumina- (Al2O3), used in various applications from abrasives to artificial bones; and more complex compounds such as hydrous aluminium silicate (Al2Si2O5 (OH)4), the main ingredient in most clay product ( Reed, 2001).