Amal S. Merzah , Ziyad S. Ahmed AL-Sarrajb, Shahad R.Abd AL-Kareema
Abstract
The present work aimed at investigating the use of (α-Al2O3) particulates in micro and nano scale; with the addition of soda-lime recycled glass powders to modify its sintering behaviors through following the role of the couple-oxide added like (Nb2O5-TiO2) at different low concentration like 0.25 weight%, 0.5 wt%, 0.75 wt% and 1 wt%. The effect of alumina content on the ability to sinter at relatively low temperature was conducted for a series of Al2O3-glass composite samples having different concentrations of alumina, glass and additive couple oxides. The samples were prepared using ceramic technology route. Alumina weight was varied and takes the values 23wt %,33.5wt %, 44wt %, and 54.5wt % to which the oxide couple Nb2O5-TiO2 was added and the samples were then denoted ASLG-NT. For all the prepared composite samples under study the sintering temperature was varied from 800°C to 900°C at a step of 25°Cwith a holding time of 2 hours at each temperature. The results showed that; as sintering temperature, and the couple oxides content increased together with the decrease in alumina content a relative density value of 98% was obtained. The Vickers micro-hardness measurements exhibited a value up to 42 GPa. Phase analysis conducted using XRD technique and microstructure analysis using SEM-technique revealed the development of a novel phase of needle-like grains starting from the surface towards the bulk which was of continues glass matrix in which the rest phase existed.
Publication Date
12/1/2016
Publisher
Online International Interdisciplinary Research Journal, {Bi-Monthly},
د.أمل صالح مرزة | Dr.Amel Salih Merzah | 6920