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Theoretical and experimental analyses of Young's modulus and thermal expansion coefficient of the alumina-mullite system

2016; Elsevier BV; Volume: 42; Issue: 15 Linguagem: Inglês

10.1016/j.ceramint.2016.07.216

1873-3956

Yoshihiro Hirata, Shota Itoh, Taro Shimonosono, Soichiro Sameshima,

MXene and MAX Phase Materials

Young's moduli (E) and thermal expansion coefficients (TECs) of the alumina–mullite–pore system (96.4–99.5% relative density) were measured for a wide mullite fraction range from 0 to 100 vol%. Both E and TEC values decreased at high mullite fractions. These properties were theoretically analyzed with four proposed model structures that were constructed by three-phase systems of mullite (or alumina) continuous phase 2–pore dispersed phase 1–alumina (or mullite) dispersed phase 3. The ratios of E(theoretical)/E(experimental) and TEC(theoretical)/TEC(experimental) were very close to unity, depending on the mullite fraction. That is, the measured E and TEC values are closely related to the change in the composite microstructure as a function of mullite fraction.