The paper studies the effect of vacuum hot pressing (VHP) conditions on the microstructure, density, and optical properties of ZnSe ceramics. Graphite and titanium foils, as well as powdered aluminum oxide, were used to isolate the compact from the graphite mold, allowing for variation in the degree of carbon contamination in the samples. It was found that carbon significantly affects the sintering and recrystallization of ZnSe ceramics, hindering the achievement of high density and transparency in the material. Microstructural analysis revealed that using aluminum oxide as insulation leads to more uniform grain growth and minimizes abnormal grain growth. Spectral studies showed that the maximum transparency of the ceramics in the infrared range is achieved after additional hot isostatic pressing (HIP) treatment of samples with an initial density higher than 97 %. It was demonstrated that further improvement of optical properties requires the complete elimination of carbon contamination, necessitating the replacement of graphite tooling in the VHP process.
Natalia A. Timofeeva – PhD in Chemistry, researcher, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of RAS, Nizhny Novgorod, Russia
Stanislav S. Balabanov – PhD in Chemistry, leading researcher, Head of Lab. High-Purity Optical Materials, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of RAS, Nizhny Novgorod, Russia
Timofey O. Evstropov – junior researcher, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of RAS, Nizhny Novgorod, Russia
Anna V. Naumova – master's student, research assistant, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of RAS, Nizhny Novgorod, Russia
Sergey V. Filofeev – PhD in Chemistry, researcher, G. G. Devyatykh Institute of Chemistry of High-Purity Substances of RAS, Nizhny Novgorod, Russia
Roman S. Kovylin – PhD in Chemistry, senior researcher, G. A. Razuvaev Institute of Organometallic Chemistry of RAS, Department of Macromolecular Compounds and Colloid Chemistry; National Research Lobachevsky State University of Nizhniy Novgorod, Nizhny Novgorod, Russia
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DOI: 10.14489/glc.2025.02.pp.027-036
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