Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide

Peculiarities of formation of microstructure in composites based on chemically synthesized zirconium nanopowders obtained by the method of decomposition from fluoride salts were considered. Hydrofluoric acid, concentrated nitric acid, aqueous ammonia solution, metallic zirconium, and polyvinyl alcoh...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Edwin Gevorkyan, Volodymyr Nerubatskyi, Volodymyr Chyshkala, Oksana Morozova
Formato:	article
Lenguaje:	EN RU UK
Publicado:	PC Technology Center 2021
Materias:	zirconium dioxide composite materials consolidation microstructure alumina sintering crack resistance Technology (General) T1-995 Industry HD2321-4730.9
Acceso en línea:	https://doaj.org/article/0e22b3769f14463cb84316f278770e79
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:0e22b3769f14463cb84316f278770e79
record_format	dspace
spelling	oai:doaj.org-article:0e22b3769f14463cb84316f278770e792021-11-04T14:16:48ZRevealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide1729-37741729-406110.15587/1729-4061.2021.242503https://doaj.org/article/0e22b3769f14463cb84316f278770e792021-10-01T00:00:00Zhttp://journals.uran.ua/eejet/article/view/242503https://doaj.org/toc/1729-3774https://doaj.org/toc/1729-4061Peculiarities of formation of microstructure in composites based on chemically synthesized zirconium nanopowders obtained by the method of decomposition from fluoride salts were considered. Hydrofluoric acid, concentrated nitric acid, aqueous ammonia solution, metallic zirconium, and polyvinyl alcohol were used. It was established that the reduction of porosity in nanopowders in the sintering process is the main problem in the formation of high-density materials. Analysis of various initial nanopowders, their morphology, and features of sintering by the method of hot pressing with direct transmission of electric current was made. Peculiarities of obtaining the composites based on them with the addition of Al2O3 nanopowders applying the electric sintering method were considered. It was shown that the increase in the content of alumina nano additives leads to an increase in strength and crack resistance of the samples due to simultaneous inhibition of abnormal grain growth and formation of a finer structure with a high content of tetragonal phase. The influence of sintering modes on the formation of the microstructure of zirconium nanopowders has been studied for different contents of alumina additives. Electric current promotes the surface activity of nanopowders and its variable value promotes partial fragmentation of agglomerated grains thus affecting the composite structure. Physical-mechanical properties of the obtained samples, optimal compositions of mixtures, and possibilities of improving some parameters were determined. It was found that nanopowders of zirconium dioxide obtained by the method of decomposition from fluoride salts are quite suitable for the production of composite materials with high physical and mechanical properties. They can compete with imported analogs and enable obtaining of crack resistance of 7.8 MPa·m1/2 and strength of 820 MPa.Edwin GevorkyanVolodymyr NerubatskyiVolodymyr ChyshkalaOksana MorozovaPC Technology Centerarticlezirconium dioxidecomposite materialsconsolidationmicrostructurealuminasinteringcrack resistanceTechnology (General)T1-995IndustryHD2321-4730.9ENRUUKEastern-European Journal of Enterprise Technologies, Vol 5, Iss 12(113), Pp 6-19 (2021)
institution	DOAJ
collection	DOAJ
language	EN RU UK
topic	zirconium dioxide composite materials consolidation microstructure alumina sintering crack resistance Technology (General) T1-995 Industry HD2321-4730.9
spellingShingle	zirconium dioxide composite materials consolidation microstructure alumina sintering crack resistance Technology (General) T1-995 Industry HD2321-4730.9 Edwin Gevorkyan Volodymyr Nerubatskyi Volodymyr Chyshkala Oksana Morozova Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide
description	Peculiarities of formation of microstructure in composites based on chemically synthesized zirconium nanopowders obtained by the method of decomposition from fluoride salts were considered. Hydrofluoric acid, concentrated nitric acid, aqueous ammonia solution, metallic zirconium, and polyvinyl alcohol were used. It was established that the reduction of porosity in nanopowders in the sintering process is the main problem in the formation of high-density materials. Analysis of various initial nanopowders, their morphology, and features of sintering by the method of hot pressing with direct transmission of electric current was made. Peculiarities of obtaining the composites based on them with the addition of Al2O3 nanopowders applying the electric sintering method were considered. It was shown that the increase in the content of alumina nano additives leads to an increase in strength and crack resistance of the samples due to simultaneous inhibition of abnormal grain growth and formation of a finer structure with a high content of tetragonal phase. The influence of sintering modes on the formation of the microstructure of zirconium nanopowders has been studied for different contents of alumina additives. Electric current promotes the surface activity of nanopowders and its variable value promotes partial fragmentation of agglomerated grains thus affecting the composite structure. Physical-mechanical properties of the obtained samples, optimal compositions of mixtures, and possibilities of improving some parameters were determined. It was found that nanopowders of zirconium dioxide obtained by the method of decomposition from fluoride salts are quite suitable for the production of composite materials with high physical and mechanical properties. They can compete with imported analogs and enable obtaining of crack resistance of 7.8 MPa·m1/2 and strength of 820 MPa.
format	article
author	Edwin Gevorkyan Volodymyr Nerubatskyi Volodymyr Chyshkala Oksana Morozova
author_facet	Edwin Gevorkyan Volodymyr Nerubatskyi Volodymyr Chyshkala Oksana Morozova
author_sort	Edwin Gevorkyan
title	Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide
title_short	Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide
title_full	Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide
title_fullStr	Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide
title_full_unstemmed	Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide
title_sort	revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide
publisher	PC Technology Center
publishDate	2021
url	https://doaj.org/article/0e22b3769f14463cb84316f278770e79
work_keys_str_mv	AT edwingevorkyan revealingspecificfeaturesofstructureformationincompositesbasedonnanopowdersofsynthesizedzirconiumdioxide AT volodymyrnerubatskyi revealingspecificfeaturesofstructureformationincompositesbasedonnanopowdersofsynthesizedzirconiumdioxide AT volodymyrchyshkala revealingspecificfeaturesofstructureformationincompositesbasedonnanopowdersofsynthesizedzirconiumdioxide AT oksanamorozova revealingspecificfeaturesofstructureformationincompositesbasedonnanopowdersofsynthesizedzirconiumdioxide
_version_	1718444819845480448

Revealing specific features of structure formation in composites based on nanopowders of synthesized zirconium dioxide

Ejemplares similares