STRUCTURE PROPERTY CORRELATION AND WEAR BEHAVIOR OF NICKEL COATED FLY ASH CENOSPHERES - ALUMINIUM COMPOSITE
Keywords:
Nickel coated cenospheres, Aluminium Metal Matrix Composites, Sliding Wear, Microstructure StudiesAbstract
The need for lightweight materials with desirable properties such as high strength and improved stiffness for automotive and aerospace application have generated considerable interest to develop aluminium based metal matrix composites. Aluminium matrix composites (AMC’s) have different and often improved properties as compared to their monolithic metal counterparts. In India, majority of the coal fired thermal power plants still resort to wet slurry disposal of ash. At the ash pond, the lightweight floating particles termed cenospheres are harvested, which have been found to be composite particles with excellent physical, chemical, morphological and mineralogical characteristics. This paper discusses the development of nickel coated fly ash cenosphere particles by the autocatalytic deposition and its use as a reinforcing particulate composite in the casting of aluminium metal matrix composite. Based on the metal, reinforcing phases, respective ratios and processing methodology, nickel coated fly ash cenospheres – aluminium composite with better features in terms of contact wear resistance, hardness have been developed. The paper also brings out the structure – property correlation of nickel coated cenosphere – aluminium metal matrix composite
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