在玻璃中复合脊性骨料是固体氧化物燃料电池(SOFC)封接材料研究热点. 实验选定在Bi2O3-BaO-SiO2-RxOy (简记为BiBaSi)玻璃体系中复合10wt%~30wt%的ZrO2颗粒来改善玻璃在高温下的封接性能.结果表明, ZrO2复合BiBaSi玻璃后, 复合体系热膨胀系数略有增大; 随着ZrO2含量增多, 复合封料适宜使用温度逐渐提高, 从基体BiBaSi玻璃的720℃到BiBaSi-10Zr、BiBaSi-20Zr、BiBaSi-30Zr的780、860和900℃; 氧化锆加入到基体玻璃中, 一部分作为脊性骨料存在于玻璃相中, 维持了高温封接要求的形状和尺寸; 另一部分逐渐进入了玻璃网络中, 促进玻璃结晶生成新的物相Bi4Si3O12; 两种晶体相共存于玻璃相中, 提高了复合体系封接的稳定性. 通过改变氧化锆加入量, 可以有效调控封接材料相关性能, 满足SOFC封接要求.
It is research focus that composite materials including glass and skeletal structure are used as sealant in solid oxide fuel cell (SOFC). The composite sealant with 10wt%-30wt% ZrO2-filler in the Bi2O3-BaO-SiO2(BiBaSi) glass were researched in order to improve sealing properties at high temperature. As a result, the coefficients of thermal expansion of the composite sealants were increased than that of basic glass. The suitable sealing temperatures of composite sealant vary from the 720℃ of base glass to 780℃, 860℃ and 900℃ of BiBaSi-10Zr, BiBaSi-20Zr, BiBaSi-30Zr, respectively. ZrO2-fillers in base glass have two roles: Parts of ZrO2-fillers as skeletal structure materials always exist in base glass, which help to maintain the required shape and size of sealant. The other ZrO2-fillers can also drop into the network of the BiBaSi glass and therefore form a new phase Bi4Si3O12. Two kinds of crystal phase of ZrO2 and Bi4Si3O12 coexist in the composite sealant to improve the stability of composite system in high temperature. The properties of sealing materials could be easily controlled in SOFC sealant by changing the amount of ZrO2-fillers in composite materials.
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