Search

Your search keyword '"Su, Zhi"' showing total 19 results
Start Over Author "Su, Zhi" Journal ceramics international
19 results on '"Su, Zhi"'

13. Y3Ce7Ta2O23.5 and Yb3Ce7Ta2O23.5—Two kinds of novel ceramics for thermal barrier coatings

Author

Mai Wen-peng, Yang Xianfeng, Wang Shi-min, Zhang Hongsong, Zhu Wei-wei, Wang Fei, Duan Qunpeng, Su Zhi-he, and Sun Debing

Subjects
010302 applied physics, Materials science, Phonon scattering, Process Chemistry and Technology, Sintering, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Thermal expansion, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Thermal barrier coating, Thermal conductivity, Lattice (order), visual_art, 0103 physical sciences, Thermal, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Ceramic, Composite material, 0210 nano-technology
Abstract

For the development of ceramic candidates for thermal barrier coatings, two kinds of new ceramics, Y3Ce7Ta2O23.5 and Yb3Ce7Ta2O23.5, were synthesized by sintering at 1873 K for 10 h. The obtained samples were composed of a single fluorite-type phase, and their relative densities are greater than 90%. Because of phonon scattering caused by the complex lattice, the large number of oxygen vacancies, and substituted atoms, the thermal conductivity is lower than that of 8YSZ. The coefficients of thermal expansion (CTEs) of these two products are located in the range of 10.22–12.57 × 10−6/K and 9.62–12.66 × 10−6/K, respectively, from 323 K to 1473 K, and they also exhibit excellent phase stability up to 1473 K. However, their thermal conductivities and CTEs are lower than those of RE2Ce2O7 (RE = La, Nd, or Sm).

Published
2019

14. Structural and thermophysical performances of Sm2LaTaO7 and Gd2LaTaO7 oxides

Author

Zhang Haoming, Chen Xiaoge, Zhang Hongsong, Su Zhi-he, Lu Kui, and Wang Fei

Subjects
Ionic radius, Materials science, Phonon scattering, Condensed matter physics, Process Chemistry and Technology, Solid-state, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, Oxygen, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, Lattice (order), Materials Chemistry, Ceramics and Composites, Orthorhombic crystal system, 0210 nano-technology, Yttria-stabilized zirconia
Abstract

In this present paper, two kinds of Ln2BTaO7 (Ln=Sm, Gd) oxides were prepared by solid state reaction at 1873 K for ten hours. The phase-composition, microstructure and thermophysical performances of sintered samples were studied. Results show that the synthesized Ln2BTaO7 oxides present onefold orthorhombic weberite lattice. Due to the phonon scattering resulted by complex crystal-lattice and numerous oxygen vacancies, the heat conductivities of obtained products are less than that of YSZ. Because of the low ionic radius of Sm3+ ions，the heat expansion quotiety of Sm2LaTaO7 is greater than that of Gd2LaTaO7.

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results