用于中温固体氧化物燃料电池的Al_(2)O_(3)/微晶玻璃复合密封材料的制备与性能  

Preparation and Performance of Al_(2)O_(3)/Glass‒Ceramic Composite Sealing Materials for Intermediate Temperature Solid Oxide Fuel Cell

作　　者：司运祥 潘尚可 任海深 林慧兴[2] SI Yunxiang;PAN Shangke;REN Haishen;LIN Huixin(Ningbo University,Ningbo 315211,Zhejiang,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)

机构地区：[1]宁波大学,浙江宁波315211 [2]中国科学院上海硅酸盐研究所,上海201800

出　　处：《硅酸盐学报》2023年第10期2653-2661,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52002387)。

摘　　要：通过流延法制备了一种新型的Al_(2)O_(3)/BaO-CaO-B_(2)O_(3)-Al_(2)O_(3)-SiO_(2)微晶玻璃(BCBAS)系复合密封材料,其具有突出的机械性能和较高的导热性能。结果表明,片状Al_(2)O_(3)可有规律定向分布在BCBAS玻璃基体中。随着片状Al_(2)O_(3)质量分数从0增加到25%,BCBAS玻璃的主要结晶相从Ca_(0.1)Ba_(0.9)SiO_(3)转变为Ba_(1.55)Ca_(0.45)SiO_(4)和BaAl_(2)Si_(2)O_(8),并进一步转变为BaAl_(2)Si_(2)O_(8)和Ba Al_(2)O4相。同时复合密封材料的导热系数从0.892 W/(m·K)增加到1.255 W/(m·K),弯曲强度和Vickers硬度分别从96 MPa增加到140 MPa,444 HV增加到677 HV。当片状Al_(2)O_(3)的质量分数不大于20%时,密封材料与连接件之间的抗拉强度保持在4 MPa以上。20%Al_(2)O_(3)~80%BCBAS微晶玻璃的复合密封材料表现出优异的综合性能:导热系数为1.203 W/(m·K)、弯曲强度为136 MPa、Vickers硬度为677 HV、密封件的抗拉强度为4.22 MPa,在抗热震性能上体现出较大的优势,使其成为中温固体氧化物燃料电池密封应用的潜在候选材料。To provide direction and guidance for the microstructure design and development of sealing materials for high-performance intermediate-temperature solid oxide fuel cell,a Al_(2)O_(3)/BaO-CaO-B_(2)O_(3)-Al_(2)O_(3)-SiO_(2) glass-ceramic(BCBAS)-based composite sealing material with superior mechanical properties and a high thermal conductivity was prepared via tape casting.According to the analysis by scanning electron microscopy and X-ray diffraction,the lamellar Al_(2)O_(3) is regularly distributed in the BCBAS glass‒ceramic matrix.The main crystallization phase of BCBAS glass transforms from Ca_(0.1)Ba_(0.9)SiO_(3) into Ba_(1.55)Ca_(0.45)SiO_(4) and BaAl_(2)Si_(2)O_(8),and further into BaAl_(2)Si_(2)O_(8) and BaAl_(2)O4 phases when the lamellar Al_(2)O_(3) content increases from 0 to 25%(in mass fraction).The thermal conductivity of biomimetic sealants increases from 0.892 W/(m·K)to 1.255 W/(m·K),and the bending strength and Vickers hardness with higher than 10 of the Weibull modulus β increase from 96 MPa to 140 MPa and 444 HV to 677 HV as the lamellar Al_(2)O_(3) content increases from 0 to 25%(in mass fraction),indicating the mechanical properties and thermal conductivity of the sealant.The sealing tensile strength of the biomimetic sealant with the mass fraction of lamellar Al_(2)O_(3)≤20% maintains above 4 MPa.The composite with 20% Al_(2)O_(3)-80% BCBAS glass exhibits the superior comprehensive properties(i.e.,thermal conductivity of 1.203 W/(m·K),bending toughness of 136 MPa,Vickers hardness of 677 and sealing strength at 4.22 MPa),thus being a potential candidate for application of intermediate-temperature solid oxide fuel cell.

关 键 词：固体氧化物燃料电池 复合密封材料 微晶玻璃 片状三氧化二铝 

分 类 号：O734[理学—晶体学]