Exploring the functions of Al2O3 in the transition of BaAl2SiO8 precipitated from CaO-BaO-Al2O3-B2O3-SiO2 sealing glass for IT-SOFCs

• Autorzy: Liu Liangguang , Luo Linghong , Wang Leying , Cheng Liang , Xu Xu , Yu Yongzhi , Qin Ying , Wu Yefan

Warianty tytułu

PL

Badanie roli Al2O3 w przemianie BaAl2SiO8 wytrąconego ze szkła uszczelniającego CaO-BaO-Al2O3-B2O3-SiO2 przeznaczonego do IT-SOFC

• Języki publikacji: EN

Abstrakty

EN

CaO-BaO-Al2O3-B2O3-SiO2 (CBABS) glasses are the promising commercialized sealing materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). Nevertheless, during the high-temperature operation, the behaviour of hexagonal BaAl2Si2O8 phase easily transformed into the monoclinic BaAl2Si2O8 phase would obviously decrease the thermal expansion coefficient of CBABS glasses, and then to form the serious cracks along the interface of bonded materials. Herein, in terms of the viscosity of CBABS glasses at the operating temperature, we studied the effect of Al2O3 on the transformation of BaAl2Si2O8 crystal form. The results showed that the CBABS glass with higher Al2O3 content presented the higher viscosity and crystallization activation energy, which could effectively prevent the excessive silica precipitation to inhibit the transformation of the BaAl2Si2O8 crystal from hexagonal phase to monocline phase. The inhibition effect of BaAl2Si2O8 crystal transformation effectively suppressed the decrease of the expansion coefficient of the glasses during the heat treatment at 973 K for 100 h, and thus to remarkably enhance the thermal stability of CBABS glasses, which would be very beneficial for IT-SOFCs in the future practical applications.

PL

Szkła CaO-BaO-Al2O3-B2O3-SiO2 (CBABS) to obiecujące, komercyjnie dostępne materiały uszczelniające do średniotemperaturowych stałotlenkowych ogniw paliwowych (IT-SOFC). Niemniej jednak podczas działania w wysokiej temperaturze zachowanie heksagonalnej fazy BaAl2Si2O8, łatwo przemieniającej się w jednoskośną fazę BaAl2Si2O8, spowodowałoby oczywiście zmniejszenie współczynnika rozszerzalności cieplnej szkieł CBABS i w efekcie utworzenie poważnych pęknięć na granicy międzyfazowej łączonych materiałów. Tutaj, w kategoriach lepkości szkieł CBABS w temperaturze roboczej, badaliśmy wpływ Al2O3 na przemianę krystalicznej postaci BaAl2Si2O8. Wyniki pokazały, że szkło CBABS o wyższej zawartości Al2O3 wykazywało wyższą lepkość i energię aktywacji krystalizacji, co mogło skutecznie zapobiegać nadmiernemu wytrącaniu krzemionki, hamując przemianę kryształu BaAl2Si2O8 z fazy heksagonalnej do fazy jednoskośnej. Efekt hamowania przemiany kryształów BaAl2Si2O8 skutecznie tłumił spadek współczynnika rozszerzalności szkieł podczas obróbki cieplnej w temperaturze 973 K przez 100 godzin, a tym samym znacznie poprawiał stabilność termiczną szkieł CBABS, co byłoby bardzo korzystne dla IT-SOFC w przyszłych praktycznych zastosowaniach.

Słowa kluczowe

EN

IT-SOFCs; CaO-BaO-Al2O3-B2O3-SiO2 sealing glass; Al2O3; viscosity; crystalline transformation; thermal stability

PL

IT-SOFC; szkło uszczelniające CaO-BaO-Al2O3-B2O3-SiO2; Al2O3; lepkość; transformacja krystaliczna; stabilność termiczna

• Wydawca: Polskie Towarzystwo Ceramiczne
• Czasopismo: Materiały Ceramiczne
• Rocznik: 2019
• Tom: T. 71, nr 4
• Strony: 368--377
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Liu Liangguang

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
• School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

autor

Luo Linghong

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
• School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

autor

Wang Leying

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
• School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

autor

Cheng Liang

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

autor

Xu Xu

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
• School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

autor

Yu Yongzhi

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
• School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

autor

Qin Ying

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
• School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

autor

Wu Yefan

• Jiangxi Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
• School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).