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Thermal degradation of hard alloys of the niobiumcadmium system at low pressure

Volodin V. N., Doctor of technical sciences, Professor, doctor of physical and mathematical sciences, Сhief scientific employee, Satbayev University, Institute of Metallurgy and Ore Benefication. The laboratory of vacuum processes. Almaty, Kazakhstan. ORCID ID: 0000-0003-0116-1423. e-mail: v.volodin@satbayev.university, Tuleushev Y. Zh., Kenzhaliyev B. K., Trebukhov S. A., – Candidate of Technical Sciences. leading researcher. The Institute of Nuclear Physics. Laboratory of ion-plasma technology. Almaty, Kazakhstan. ORCID ID: 0000-0002-6555- 3891. e-mail: Yuriy.tuleushev@inp.kz, Doctor of technical sciences, Pprofessor, Vice-Rector for scientific rsearch, Satbayev University, General director - Chairman of the Institute of Metallurgy and Ore Benefication, Almaty, Kazakhstan. ORCID ID: 0000-0003-1474-8354, e-mail: bagdaulet_k@satbayev.university, Candidate of Technical Sciences, associate professor. Deputy general director, Satbayev University, Institute of Metallurgy and Ore Benefication. Almaty, Kazakhstan. ORCID ID: 0000-0001-9708-0307, e-mail: s.trebukhov@satbayev.university
2020 Kompleksnoe ispolʹzovanie mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik shikisattardy Keshendi Paidalanu  

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Due to the lack of data on the double film Nb-Cd system thermal stability, the effect of thermo-vacuum treatment of cadmium solid solutions in niobium, in intermetallic compound NbCd2 and in cadmium-based alloys on the structure of materials was studied. A step-by-step isochronous annealing at a temperature of 300 and 500°C and a pressure of 1•10 -3 Pa was used as the research method followed by tracking changes in the composition and structure by comparing the diffractometric data before and
more » ... ter heat treatment. The amount of cadmium in the coating, the sublimation (evaporation) rate of cadmium from film coatings was determined based on the previously established dependence of the lattice parameter of the body-centered cubic lattice of solid solutions on the composition. As a result, the heating of film coatings (49.0 -64.5 at % Cd) represented by solid solutions in high vacuum up to 300°C was founded to be accompanied by the onset of intense degradation of the crystalline niobiumcadmium system due to the diffusion of cadmium atoms to the solid phase-vapor interface and its subsequent sublimation. Coatings from the NbCd2 intermetallic compound which is a degenerate semiconductor and cadmiumbased solid solutions (72.5 and 76.8 at % Cd) including the amorphized phase of the intermetallic compound, after exposure at this temperature are degraded due to the complete transfer of cadmium to the vapor phase by evaporation. Upon thermal exposure to a temperature of 200°C, the structure of solid solutions of cadmium in niobium and the NbCd2 intermetallic compound was stable.
doi:10.31643/2020/6445.05 fatcat:pubvd3swhjg5nbo6ngitpem6ei
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Volodin V. N., Doctor of technical sciences, Professor, doctor of physical and mathematical sciences, Сhief scientific employee, Satbayev University, Institute of Metallurgy and Ore Benefication. The laboratory of vacuum processes. Almaty, Kazakhstan. ORCID ID: 0000-0003-0116-1423. e-mail: v.volodin@satbayev.university, Tuleushev Y. Zh., Kenzhaliyev B. K., Trebukhov S. A., – Candidate of Technical Sciences. leading researcher. The Institute of Nuclear Physics. Laboratory of ion-plasma technology. Almaty, Kazakhstan. ORCID ID: 0000-0002-6555- 3891. e-mail: Yuriy.tuleushev@inp.kz, Doctor of technical sciences, Pprofessor, Vice-Rector for scientific rsearch, Satbayev University, General director - Chairman of the Institute of Metallurgy and Ore Benefication, Almaty, Kazakhstan. ORCID ID: 0000-0003-1474-8354, e-mail: bagdaulet_k@satbayev.university, Candidate of Technical Sciences, associate professor. Deputy general director, Satbayev University, Institute of Metallurgy and Ore Benefication. Almaty, Kazakhstan. ORCID ID: 0000-0001-9708-0307, e-mail: s.trebukhov@satbayev.university. "Thermal degradation of hard alloys of the niobiumcadmium system at low pressure." Kompleksnoe ispolʹzovanie mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik shikisattardy Keshendi Paidalanu 312.312 (2020) 41-47