Study on Hydration Resistance of MgA1ON Composites

Abstract

Selected Aggregate, matrix and a small amount of sintering aids as raw materials. Two test samples series of hydration resistance were made, one is powder the other is block. Measured the pH value of the hydration samples, the content of nitrogen before and after hydration; drawn the change curve of pH value, calculated the weight change rate of samples before and after hydration; detected the phase composition of block sample before and after hydration. The results show that: under the same process conditions, the hydration resistance of MgAlON composite with spinel as aggregate is better than that of MgAlON composite with magnesia as aggregate. Compared with the sample of the same aggregate, the hydration resistance of the alumina based sample is better than that of the bauxite based sample. The phase composition of samples is almost unchanged before and after hydration, The reason for hydration is mainly due to the hydration of a small amount of AlN in the sample. The hydration resistance of MgAlON composites is much better than that of AlN composite.