摘要
为寻找抗碱性强且满足三元正极材料烧结使用的匣钵材料,将LiOH·6H_(2)O分别置于重结晶SiC、β-SiC结合SiC质匣钵材料上,在氧气气氛下经780℃保温20 h进行侵蚀试验,并与市售的堇青石-莫来石质匣钵材料做对比,采用SEM及XRD分析了3种材料的显微结构与物相组成。结果表明:1)β-SiC结合SiC材料经侵蚀后表面生成了一层厚度为4.2 mm的反应层;重结晶SiC材料表面没有明显的反应层;堇青石-莫来石材料表面变得凹凸不平,表面以下生成深度约1.8 mm的反应层。2)匣钵材料的致密性会显著影响Li_(2)O的渗透深度;β-SiC结合SiC材料较为致密,Li_(2)O渗透深度浅,反应所伴随的体积膨胀效应严重改变了材料的表面结构。3)重结晶SiC材料显气孔率及孔径均大于β-SiC结合SiC材料的,Li_(2)O更容易渗透进入重结晶SiC材料内部,在内部孔隙中生成Li_(2)SiO_(3),但重结晶SiC材料的整体结构未受到明显影响。
In order to get sagger material with high alkali resistance and suitable for ternary cathode material,LiOH·6H_2O was placed on the surface of recrystallized SiC sagger material and β-SiC bonded SiC sagger material,respectively,to investigate their corrosion at 780 ℃ for 20 h in oxygen atmosphere.The two sagger materials were compared with the commercial cordierite-mullite saggar material.The microstructure and the phase composition of the three materials were analyzed by SEM and XRD.The results show that:(1)a reaction layer with a thickness of 4.2 mm is formed on the surface of β-SiC bonded SiC material after corrosion;there is no obvious reaction layer on the surface of the recrystallized SiC material;the surface of cordierite-mullite material becomes uneven,and a reaction layer with a depth of about 1.8 mm is formed below the surface;(2)the density of sagger materials can significantly affect the penetration depth of Li_(2)O;the β-SiC bonded SiC material is denser and the penetration of Li_(2)O is shallower;the volume expansion caused by the reaction seriously damages the surface structure of the material;(3)the apparent porosity and the pore size of the recrystallized SiC material are larger than those of the β-SiC bonded SiC material,Li_(2)O can penetrate into the recrystallized SiC more easily and form Li_(2)SiO_(3) in the internal pores,but the overall structure of the material is not affected obviously.
作者
郑翰
马昭阳
曹会彦
万龙刚
相宇博
钱凡
吴吉光
Zheng Han;Ma Zhaoyang;Cao Huiyan;Wan Longgang;Xiang Yubo;Qian Fan;Wu Jiguang(State Key Laboratory of Advanced Refractory Materials,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China;不详)
出处
《耐火材料》
CAS
北大核心
2023年第2期125-130,共6页
Refractories
基金
国家重点研发计划(2017YFB0304000)
中原千人计划-中原科技创新领军人才(204200510011)
宁夏回族自治区重点研发计划(2022BFE01003)。
