Sintering oxide ceramics based on AI2O3 and ZrO2, activated by MgO, TiO2 and SiO2 additives

International Conference and Youth Scientific School on "Materials and Technologies of New Generations in Modern Materials Science"

Matrenin, S.V.^1 ; Zenin, B.S.^1 ; Tayukin, R.V.^1

Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk

634050, Russia^1

关键词: Alumina ceramic;    Ceramic systems;    Dispersion strengthening;    Hyper-eutectic compositions;    Oxide ceramics;    Physical and mechanical properties;    Physicomechanical properties;    ZrO2-Y2O3;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/156/1/012034/pdf
DOI  :  10.1088/1757-899X/156/1/012034

来源: IOP

【 摘 要 】

The positive effect of the addition of MgO and TiO2in an amount of no more than 1 wt. % on sintering and physico-mechanical properties of alumina ceramics is established. Addition of 5% of SiO2to A12O3provides the mechanism of liquid phase sintering of ceramics, which leads to increase in its density and strength up to 480 MPa. In ceramic system A12O3- ZrO2- Y2O3highest level of physical and mechanical properties of the composition had a hypereutectic composition 16.6% A12O3- 76% Z1O2- 7.4% Y2O3. In this composition two mechanisms of hardening are realized simultaneously, such as transformational hardening by t- m - ZrO2transition and dispersion strengthening with high-modulus particles of α- A12O3.