摘要
95%Al_2O_3陶瓷高温烧结后表面斑点的表征与控制对于绝缘陶瓷沿面闪络耐压性能的提高至关重要。为分析和鉴定95%Al_2O_3陶瓷表面暗斑区未知物相和化学成分,采用掠入射X射线衍射技术、飞行时间–二次离子质谱仪并结合扫描电子显微镜/能谱仪技术对95%Al_2O_3陶瓷表面暗斑进行了研究。结果表明:与正常区相比,暗斑区除α-Al_2O_3外,还形成了(Na,K)AlSi_3O_8和Ca_2Al_2SiO_7铝硅酸盐相,暗斑区Si、Ca含量降低而K、Na、Fe富集。元素含量的变化促进了铝硅酸盐相的析出,进而导致95%Al_2O_3陶瓷表面暗斑的产生。
The characterization of surface freckles of 95%Al2O3 ceramics after high-temperature sintering is crucial for the improvement of surface flashover performance of alumina-based insulating ceramics. In this paper, the precipitated phases and chemical composition of the freckle area on the surface of 95%Al2O3 ceramic were analyzed by X-ray diffraction, time-of-flight secondary ion mass spectrometry, scanning electron microscopy, and energy dispersive spectroscopy, respectively. The results show that（Na, K）AlSi3O8 and Ca2Al2SiO7 aluminosilicates appear in the freckle area of 95%Al2O3 ceramic besides α-Al2O3. The contents of Si and Ca in the freckle area decrease, while the contents of K, Na and Fe increase, compared to the contents of those elements on the normal surface of 95%Al2O3 ceramic. The variety of the element contents leads to the precipitation of the aluminosilicates and the formation of the freckle area on the surface of 95%Al2O3 ceramic.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2017年第12期1782-1787,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51604251)
中国工程物理研究院电子工程研究所创新发展基金(S20151113)
关键词
氧化铝陶瓷
暗斑
掠入射X射线衍射
飞行时间–二次离子质谱仪
铝硅酸盐
alumica ceramic
freckle
grazing incidence X-ray diffraction
time-of-flight secondary ion mass spectrometry
aluminosilicates
