Alumina Particle Surface Nickel-plated Iron Matrix Surface Composites

This paper worked over the coating processing on surfaces of particles, abtained nickel coating on alumina(Al2O3) particles ,fabricated successfully coated A12O3 particle reinforced iron matrix composites using a vacuum infiltration prossess .Both composite fabrication and casting processing have been improved and optimized. The microstructure and property of the composites were researched and analyzed.Wear resistance of grey iron matrix composites with various volume fraction and different particle size has been researched.On the basis of precedent researches, this paper aimed to substitute WC with A12O3 and to develop composites with more usage prospective and economical value.During the experiment, the surface activiting and nickel coating technology have been researched and the problem that composites with some thickness could not been obtained for the not-wettablity question of ceramic particles with metal liquor has been resolved successfully.The externalities ,effected the coating technology including time, temperature , carrying capacity, and the nickel layer on the surface of A12O3 particles have been systematically analyzed and studied.The results show that the nickel coating on the not activtion surface of ceramic particles with uniform thickness and light appearance can be obtained after being coarsened, activited, sensitizated and reducted, but it is necessary to control some externalities. Particle surface reinforced metal matrix composites have been abtained successfully by vacuum infiltration.In the structure composites, A12O3 and WC have been carefully contrasted and analyzed.The results show that some problems still existed at the interface between A13O3 particles with nickel layer and metal matrix.The problems influence the application of composites.For better meeting the demand of practical manufacture,the wettablity of A12O3 particles and metal matrix should be further improved.