Abstract
The effect of mechanical treatment by planetary ball milling on the properties of hot pressed ZrB2 - SiC ceramics was studied. It has been shown that material densification after mechanical treatment is finished at initial stages of sintering process. Addition of SiC causes a substantial increase in density of the sample to 99% of the theoretical powder containing 20% of silicon carbide, in comparison with samples ZrB2 density not exceeding 76%. It has been shown that all defects which were accumulated during mechanical treatment anneal in hot pressure process and there are no any changes of CDD values in sintered ceramics.
Highlights
High-melting compounds are the main part of the materials utilized in high-temperature technologies for heat protection of aerospace machinery and in electronics
The aim of this work was to investigate the influence of mechanical treatment of ZrB2-SiC powder system on the structure of the produced ceramic composites
After the mechanical treatment during 20 minutes it was reduced to 5.9 m2/g
Summary
High-melting compounds are the main part of the materials utilized in high-temperature technologies for heat protection of aerospace machinery and in electronics. Between high melting point materials, ZrB2-based ceramic composites are the point of special interest. ZrB2-SiC composites are being produced via sintering process under high pressure and temperature of 2000 °C [2,4]. Mechanical treatment of the powders in high-energy mills stays one of the most effective methods for baking temperature reduce and superdense microcrystalline structure production of high-melting compounds without application of activating additives which usually have negative effect on the thermal properties of the material [3].
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