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Effect of Si 4+ substitution on mechanical and thermal expansion properties of Ca 0.5 Sr 0.5 Zr 4 P 6 O 24 ceramics
Author(s) -
Wang Yang,
Zhou Yuanyuan,
Han Zhuoqun,
Liu Futian
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13329
Subject(s) - materials science , sintering , thermal expansion , ceramic , thermal hysteresis , anisotropy , analytical chemistry (journal) , mineralogy , composite material , thermodynamics , phase transition , physics , chromatography , quantum mechanics , chemistry
The Ca (1+ x )/2 Sr (1+ x )/2 Zr 4 P 6‐2 x Si 2 x O 24 (CSZP 6‐2 x S 2 x , 0 ≤ x ≤ 0.3) ceramics were prepared using powders synthesized by co‐precipitation method, and the effects of Si 4+ substitution on the structure, mechanical, and thermal expansion properties were investigated. The optimum sintering time was 4 hours, which greatly shortened the sintering process. By controlling the appropriate composition and sintering temperature, a single phase with the typical NaZr 2 P 3 O 12 structure was obtained. As a function of x increasing, the parameter a increased and then decreased, while the parameter c and unit cell volume both increased. The mechanical property of CSZP 6‐2 x S 2 x ceramics was affected with increasing amount of Si 4+ content. The Si 4+ substitution could increase the thermal expansion anisotropy and lead to the generation of microcracks, which are responsible for the increase in the amount of hysteresis between heating and cooling curves. The thermal expansion decreased progressively from 1.8 to 0.8 × 10 −6 /°C. The investigations indicate that the CSZP 6‐2 x S 2 x ceramics are potential materials in high temperature applications