Nanoporous ceramic products from pure aluminum oxide were fabricated by plasma spraying method. The deposition process consists of passing of sprayed material particles with high velocity through plasma flow and subsequent coating of these particles on the surface of rotating metal forming mandrel. The products manufactured by standard techniques of plasma spraying have low thermal conductivity and selectively high gas permeability. The material of these products has a heterogeneous phase composition which is formed during the high speed cycle of heating and cooling when aluminum oxide particles passing through a stream of air plasma. Aluminum oxide particles in the composition of the material of products are in the alpha state and also in the beta- and gamma states. Reduction in porosity of products to nanoscale values (100-250 nm) and translation of material of plasma sprayed oxide product into single-phase alpha-state leads to a sharp increase in its thermal conductivity. By varying the sintering modes it is possible to fabricate nanoporous products with desired values of thermal conductivity. Products from this material may be efficiently used in special electrometallurgy as containers for growing single crystals, in chemical industry, in mechanical engineering, instrumentation and special equipment, as well as in medicine and biotechnology.Keywords: nanoporous ceramics, aluminum oxide, plasma spraying
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