The Study on Thermal Expansion of Ceramic Composites with Addition of ZrW2O8

International Conference on Advanced Materials and New Technologies in Modern Materials Science 2015

Dedova, E.S.^1,2,3 ; Shadrin, V.S.^2,3 ; Petrushina, M.Y.^4 ; Kulkov, S.N.^1,2,3

Tomsk Polytechnic University, Avenue Lenin, 30, Tomsk

634050, Russia^1

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

634055, Russia^2

Tomsk State University, Avenue Lenin, 36, Tomsk

634050, Russia^3

Novosibirsk State University, st. Pirigova, 2, Novosibirsk

630090, Russia^4

关键词: Ceramic composites;    Linear thermal expansion coefficients;    Polished surfaces;    Thermal expansion mismatch;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/116/1/012030/pdf
DOI  :  10.1088/1757-899X/116/1/012030

来源: IOP

【 摘 要 】

The studies on structure, phase composition and thermal properties of (Al2O3- 20 wt% ZrO2) - ZrW2O8ceramic composites obtained using nanosized, initial powders were conducted. Homogeneously distributed white particles on the polished surface of composites were observed. Phase composition of the composites was represented with corundum, monoclinic ZrO2and two modifications of ZrW2O8(tetragonal and cubic). Linear thermal expansion coefficient values of the composites were determined. The difference in experimental and calculated coefficient of thermal expansion values for composites obtained may be attributed to phase transformations, features of the structure, internal stresses due to thermal expansion mismatch, which contribute significantly to thermal expansion of the ceramic composites.