Abstract
Recently, the interest in nanocrystalline materials based on high-melting point compounds has increased. It is hoped that new superhard materials can be obtained. The main problem in the consolidation of particulate nanostructured materials is to combine full density with conservation of the nanostructure, that is keeping the grain size of the initial ultrafine powder (UFP). Conventional temperature regimes in sintering and hot pressing are not suitable due to intense recrystallization. Nowadays, high-energy methods of consolidation of nano-particulate materials are the most promising ones [1, 2]. A review of methods for the preparation of nanocrystalline materials by using high pressures can be found in [3]. High-pressure sintering is one of the promising methods. Many superhard polycrystalline materials based on diamond and cubic boron nitride have been produced by this method [4, 5]. High-pressure sintering is especially effective for fabricating ceramics based on high-melting point compounds because dense materials can be produced without any additive while at the same time the duration of sintering can be reduced. For example, dense AlN ceramics with high thermal conductivity and highly dense a-Si3N4 ceramics with high level of corrosion resistance have been obtained by this method [6, 7].
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