High-density micro- and nanogranular ceramics. Transition of open pores to closed ones. Part 3. Sintering of workpieces without external pressure

Abstract

An explanation of the processes occurring in obtaining high-density micro- and nanogranular ceramics without the use of external pressure on the basis of data accumulated in the literature is proposed. It is known that pore growth begins after the beginning of the transition of open pores to closed ones, which begins at about 30 % open porosity. It is necessary to maintain open pores to the maximum possible total density of sintered ceramics. The article describes different methods of sintering ceramics, allowing to obtain high-density non-porous ceramics. Ill. 6. Ref. 74. Tab. 1.