摘要
采用熔融–热处理工艺制备了Si O2–B2O3–Ba O–Na2O–Ca O–Zr O2–Ti O2体系钙钛锆石基钡硼硅酸盐玻璃陶瓷,研究了Ca O、Ti O2、Zr O2(记为CTZ,摩尔比为2:2:1)含量对玻璃陶瓷相结构、显微结构的影响,采用产品一致性测试法(PCT)测试了玻璃陶瓷样品的抗浸出性能。结果表明:样品的玻璃转变温度为615~650℃且随着CTZ含量增加而升高。CTZ含量为35%的样品和CTZ含量为45%的样品分别在900和850℃附近出现了明显的放热峰。当CTZ含量≥30%时,钙钛锆石晶相开始析出;CTZ含量为45%时,样品中出现大量均匀分布的柱状钙钛锆石晶相;CTZ含量达55%时,样品致密性较差,除钙钛锆石晶相外还有榍石和二氧化硅晶相析出。PCT测试表明:CTZ含量为45%的样品具有较好的抗浸出性能,B和Na在42 d后的归一化质量损失约为0.1 g/m2,Si和Ca约为0.01 g/m2,与硼硅酸盐玻璃固化体处于同一数量级。
Zirconolite-based glass-ceramics(i.e., Si O2–B2O3–Ba O–Na2O–Ca O–Zr O2–Ti O2 system) were prepared by a melting-heat treatment method. The effect of nucleation agent(i.e., Ca O, Zr O2 and Ti O2, abbreviated as CTZ) content on the crystalline phase and microstructure of the glass-ceramics was investigated. The leaching resistance of zirconolite-based glass-ceramics was determined via product consistency test(PCT). The results show that the glass transition temperature(Tg) increases from approximately 615 ℃ to 650 ℃ with increasing the content of CTZ. An exothermic peak appears at 900 ℃ and 850 ℃ for the samples with 30%(in mass fraction, the same below) of CTZ(CTZ-35) and 45% of CTZ(CTZ-45), respectively. Zirconolite phase appears in the bulk of basic glass with 30% of CTZ. The massive zirconolite crystals with the columnar shape occur in the sample with CTZ-45. In addition, zirconolite, sphene and silicon oxide phases occur in the sample with 55% of CTZ, which possesses a poor density. The PCT experiment of glass-ceramics show that sample CTZ-45 has a good leaching resistance. After 42 d, the normalized mass loss(NLi) of Na and B is 0.1 g/m2 and the NLi of Ca and Si is 0.01 g/m2, which are the same order of magnitude of borosilicate glass waste.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第1期127-132,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金项目(11305135)
西南科技大学大学生创新创业训练项目(13cxcy12)
