Fracture-Resistant Zirconia-Based Composite Ceramics with Increased Surface Layer Hardness

A. A. Dmitrievskiy; Дмитриевский А. А.; D. G. Zhigacheva; Жигачева Д. Г.; N. Yu. Efremova; Ефремова Н. Ю.; V. M. Vasyukov; Васюков В. М.; G. V. Grigoriev; Григорьев Г. В.

doi:10.31857/S1028096023080071

Fracture-Resistant Zirconia-Based Composite Ceramics with Increased Surface Layer Hardness

Authors: Dmitrievskiy A.A.¹, Zhigacheva D.G.¹, Efremova N.Y.¹, Vasyukov V.M.¹, Grigoriev G.V.¹
Affiliations:
1. Derzhavin Tambov State University
Issue: No 8 (2023)
Pages: 107-112
Section: Articles
URL: https://ogarev-online.ru/1028-0960/article/view/137804
DOI: https://doi.org/10.31857/S1028096023080071
EDN: https://elibrary.ru/OAKWKU
ID: 137804

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Abstract
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Abstract

A two-layer alumina toughened zirconia composite ceramic stabilized with calcium oxide (Ca-ATZ) was produced using a relatively economical powder metallurgy method. One of the layers contains silica additive (Ca-ATZ + SiO₂). The structure, elemental and phase composition as well as the complex of mechanical properties nearby of the Ca-ATZ/Ca-ATZ + SiO₂ interface has been investigated. It was shown that the presence of a sharp interface of layers with different elemental composition did not cause structural disorders (appearance of pores, cracks and other macroscopic defects that contribute to the deterioration of strength properties) or changes in the phase composition (more than 90% of zirconia in both layers was in the tetragonal phase, which provided a high role of the transformation toughening mechanism). Demonstrated preservation of structural integrity and ratio of monoclinic, tetragonal and cubic zirconia phases at formation of sharp interface of the mentioned layers, provides possibility of manufacturing of zirconia-based ceramics with thin (100–200 μm) modified layer. Taking into account the difference in mechanical properties of Ca-ATZ and Ca-ATZ + SiO₂ ceramics, this provides the basic material (containing SiO₂) increased fracture toughness (not less than 12 MPa m^1/2), and near surface layer (not containing SiO₂) high hardness (not less than 14 GPa).

Keywords

two-layer composite ceramics, microstructure, phase composition, surface modification, hardness, fracture toughness, composition interface.

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