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Vol 488, No 1 (2019)
- Year: 2019
- Articles: 3
- URL: https://journals.rcsi.science/0012-5008/issue/view/9326
Chemical Technology
Effect of Sodium Silicate on the Sintering and Properties of Zirconia Ceramics
Abstract
Dependences of the formation of the microstructure and phase composition of partially stabilized zirconia ceramics on the sintering temperature and the content of the sintering additive have been studied. It has been shown that introduction of an additive forming a low-temperature melt based on sodium silicate Na2SiO3 reduces the sintering temperature by 200°C. Dense nanocrystalline materials with a crystal size of 100–200 nm, a flexural strength to 600 MPa, and a sintering temperature of 1200–1250°C were obtained.
239-241
Exothermic Synthesis and Consolidation of Single-Phase Ultra-High-Temperature Composite Ta4ZrC5
Abstract
The possibility of producing ultra-high-temperature composite Ta4ZrC5 by a single-stage method was experimentally studied. The method combines the exothermic synthesis by electrothermal explosion and the consolidation of the hot product under quasi-isostatic compression. The effect of the mechanical activation of the reaction mixture of powders of tantalum, zirconium, and carbon on the formation of the phase composition of Ta4ZrC5 ceramic composite was investigated. The conditions for producing single-phase ultra-high-temperature composite were determined. Composites with an average particle size of 1–2 μm and a residual porosity of 8–10% were obtained.
242-245
Structural Features of Titanium Boride-Based Layered Composite Materials Produced by Free SHS Compression
Abstract
Titanium boride-based layered composites on VT6 (Ti6Al4V) titanium alloy were produced for the first time by free SHS compression, a method combining combustion and high-temperature shear deformation. A layered structure of the obtained material was determined, and a structural feature of the transition zone at the ceramic composite–titanium alloy interface was studied.
246-248