Mastering the Processes of Synthesis of Oxide Compounds With the Use of a Powerful Source of Fast Heating of the Initial Ingredients

Abstract

The creation of new materials with predetermined properties is perhaps the mostimportant issue and problem of modern materials science. Increasingly harsh conditions for the useof materials in modern, and especially - promising technological processes, the need to ensure andimplement the safest conditions for humanity and the environment of modern industrial production,the importance and increasing role of economic factors – all these factors necessitate improvingknown and creating new materials, as well as technologies for their production and use. Furthereconomically justified, socially attractive and technologically safe use of nuclear technologies andoperation of modern complex technical facilities, which undoubtedly include nuclear power devices,further development of nuclear and in the future thermonuclear energy is impossible withoutmodernization.The article implements the method of electron beam heating of a mixture of yttrium andzirconium oxides for the synthesis of complex oxides. The initial mixture contained ingredients in anamount corresponding to the compound Y2Zr2O7. The mixture was heated in a tantalum containeralmost to the melting point of tantalum (2915 C). The high temperature of the process is provided bythe use of a system with a plasma electron emitter. The purpose of the vacuum high-temperature effect on the powder mixture was to implement conditions sufficient to initiate reactions for the synthesis ofcomplex oxides. The analysis of the obtained samples recorded after the initial high-temperaturetreatment a fluorite-type phase (Y, Zr) Ox with a lattice parameter of 5.2 Å and technologicalimpurities of tantalum oxide. After additional annealing in air at 1200 C for 7 hours, another phasewith a lattice parameter of 5.17 Å was recorded, as well as impurities of tantalum oxide. The testedsynthesis conditions lead to the formation of multi-element oxides with a structure of only fluorite,pyrochlore phase in the heat is not detected.

Determining the influence of ultra-dispersed aluminum nitride impurities on the structure and physical-mechanical properties of tool ceramics

“…The tests met international standards ASTM G99-959, DIN 50324, and ISO 20808. Designing new materials with predefined properties is perhaps the most important issue and the task of modern materials science [36]. The cutting Al 2 O 3 -based ceramics, strengthened with 10...20 wt % of silicon carbide fibers, ensure high purity of the machined surface [37,38].…”