X-Ray Diffraction Analysis of the Sintered Y-TZP-AI2O3 Ceramics

International Seminar on Interdisciplinary Problems in Additive Technologies

材料科学;物理学

Savchenko, Nickolai^1,2,3 ; Sablina, Tatiana^1 ; Sevostyanova, Irina^1 ; Pshenichnyy, Artem^3 ; Buyakova, Svetlana^1,2,3 ; Kulkov, Sergei^1,2,3

Institute of Strength Physics and Materials Science, SB RAS, 2/4, pr. Akademicheskii, Tomsk

634055, Russia^1

Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk

634050, Russia^2

Tomsk State University, 36, Lenin Avenue, Tomsk

634050, Russia^3

关键词: Crack networks;    Crystalline grains;    Deformation twin;    Friction coefficients;    Friction surfaces;    Initial state;    Peak intensity;    Tetragonal phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/140/1/012015/pdf
DOI  :  10.1088/1757-899X/140/1/012015

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The paper discusses the wear resistance, friction coefficient, and structure of friction surfaces of fine-grained (0.2 μm) Y-TZP-Al2O3composite rubbed against a steel disk counterface at a pressure of 5 MPa in a range of sliding speeds from 1 to 20 m/sec. It is shown that, starting at 2 m/sec, the fricti on surface is subdivided by a crack network into separate regions within which local spalling occurs at the maximum wear rate and a sliding speed of 5 m/sec. X-ray diffraction reveals inversion (with respect to the initial state) of the peak intensities of the tetragonal phase with random crystalline grain orientation. The degree of this inversion increases with sliding speed. These results are discussed in terms of the effects exerted by the reorientation of martensite-free deformation twins in the tetragonal phase and the formation of a quasi-liquid film on the wear resistance of fine-grained Y-TZP-Al2O3.