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Vol 55, No 13 (2019)
- Year: 2019
- Articles: 2
- URL: https://journals.rcsi.science/0020-1685/issue/view/9638
Article
Synthesis of Ceramics Based on Titanium, Zirconium, and Hafnium Nitrides
Abstract
A review of the most common synthesis methods of highly dispersed powders of metal nitrides of titanium subgroup is given. It is shown that the dispersion and scattering of particle size, powder form, and composition of their surface determine the results of the sintering. The comparative evaluation of advantages and limitations of the realized processes based on different approaches to the activation of sintering original powder materials and the possibility of unconventional technology of nitride ceramics based on the complete nitriding of three-dimensional samples (metals or nonstoichiometric nitrides) of a given shape, taking into account dimensional changes in the process of complete nitriding, are presented. Promising directions in this area of study are identified. The bibliography includes 132 references.
1303-1327
Chemical Transformations of Calcium Phosphates during Production of Ceramic Materials on Their Basis
Abstract
Production of ceramic materials based on various calcium phosphates is a multistep process, which includes preparing a substance in a splintered state (powder or suspension), molding a sample or product using one of the available methods, and sintering. A given phase composition, microstructure, and shape of the sample are formed during sintering, which are properties necessary for the intended use of the material. All stages of the production of phosphate-based materials are performed, as a rule, by predetermined chemical reactions. The chemical transformations occurring at different stages of the production of ceramic materials based on calcium phosphates are examined in the present review.
1328-1341