SiC粉体中Fe元素的赋存形态及其提纯工艺  

Morphology of Fe Element and Purification Technology of Silicon Carbide Powders

作　　者：冯东 任全兴 姜岩 茹红强[1] 王伟[1] 张翠萍[1] 赵世伟 秦肇伯 Feng Dong;Ren Quanxing;Jiang Yan;Ru Hongqiang;Wang Wei;Zhang Cuiping;Zhao Shiwei;Qin Zhaobo(Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education(ATM),Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2020年第2期644-649,共6页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2017YFB0310300);国家自然科学基金(51772048,51602041);装备预先研究项目(41422010905,41422010903)。

摘　　要：为了探究SiC块体中Fe元素的赋存形态及其粉体纯化机制,分别以冶炼后SiC块体以及经气流磨破碎后的粉体为主要原料,以HCl、HNO3、H2SO4和HF作为酸洗剂,对SiC粉体进行酸洗。通过XRD、SEM和ICP等检测手段对SiC块体和酸洗前后粉体的物相组成、微观结构及Fe元素含量进行表征,重点研究微观状态下SiC中Fe元素的赋存形态及其酸洗提纯工艺。结果表明:Fe元素以FexSiy固溶体的形式赋存于SiC块体的内部,并且微观状态下呈现出被游离Si所包裹的形态;当控制液/固比为5:1时,最佳酸洗的工艺参数为:HF浓度0.15 mol/L,浸出温度70℃,浸出时间2 h,在此工艺下Fe元素的去除率可达94.1%。In order to explore the morphology of Fe element in silicon carbide(SiC) block and the purification technology of SiC powders.the SiC block and powders were used as the main raw materials,HCl,HNO3,H2SO4 and HF were used as pickling agents,the SiC powders were pickled.The phase composition,microstructures and Fe element content of SiC block and powders before and after pickling were characterized by X-ray diffraction,scanning electron microscopy and ICP,respectively.The morphology of Fe element in SiC block in microscopic state and the purification technology of SiC powders were investigated.The results indicate that Fe element exists in the form of FexSiy solid solution inside the SiC block.It can be seen that Fe element is wrapped by free Si in the microscopic state.When the liquid/solid ratio is about 5:1,the optimum purification technology parameters are considered as follows:the HF concentration 0.15 mol/L,pickling temperature 70℃ and leaching time 2 h,and the removal rate of Fe element can reach 94.1% under this pickling technology.

关 键 词：SIC Fe元素 微观结构 酸洗工艺 

分 类 号：TQ174.758.12[化学工程—陶瓷工业]