A PROCESS FOR MAKING PRECURSOR POWDER USEFUL FOR PREPARING DENSE HEXAGONAL BORON NITRIDE - MULLITE COMPOSITE.

摘要

The invention provides a process for preparation of precursor powder comprising boron nitride, silicon and aluminium through hydrogel route to impart greater homogeneity in the said precursor powder as well as to the dense hexagonal boron nitride-mulite composite prepared from the said powder. The process also reduced the sintering temperature and eliminate the use of inert atmosphere for sintering of the product as against the known process.