Fabrication of ni metal matrix composites reinforced with sio2 by microwave sintering

Abstract

Nickel matrix reinforced with SiO2 has been manufactured by microwave sintering at various temperatures. A uniform nickel layer on SiO2 powders was deposited prior to sintering using electroless plating technique, allowing close surface contact than can be achieved using conventional methods such as mechanical alloying. The reactivity between SiO2 powders to form compounds is controlled through Ni layer existing on the starting powders. A composite consisting of ternary additions, a ceramic phase, SiO2, and a metal, Ni has been prepared at the temperature range 700°C-1100°C under Ar shroud. XRD, SEM (Scanning Electron Microscope), compressive testing and hardness measurements were employed to characterize the properties of the specimens. Experimental results carried out for 1100°C shows the best properties as max and hardness (HB) were obtained at 1100°C. XRD studies revealed that NiO, SiO2 and phases were formed between SiO2 and Ni layers, suggesting that microwave sintering of electroless Ni plated SiO2 powders can be used to produce ceramic reinforced Nickel composites.