摘要
为研究SiC多孔陶瓷支撑体的耐酸、碱腐蚀性,以SiC粉末、钾长石、石英和高岭土为主要原料,以石墨和活性炭为造孔剂,制备了SiC多孔陶瓷支撑体,并在不同的溶质质量分数和时间条件下,利用NaOH和HCl溶液对支撑体进行腐蚀.分别利用扫描电子显微镜、过滤压降测试系统和阿基米德排水法对支撑体的受腐蚀程度进行测试,并对支撑体的碱腐蚀机理进行分析.结果表明:支撑体在HCl溶液中的耐腐蚀性较好,过滤压降和表面形貌均未发生明显变化,支撑体中粘结剂表面没有新的结晶物质生成,说明支撑体具有较好的耐酸腐蚀性能;支撑体在较高浓度的NaOH溶液中受到明显腐蚀,其过滤压降、表面形貌和气孔率受腐蚀时间和溶质质量分数的影响较大.支撑体在NaOH溶液中腐蚀较严重的原因是支撑体中以玻璃相为主的粘结剂会与Na OH反应生成铝硅酸钠溶胶.
In order to study the acid and alkali corrosion of the supports of SiC porous ceramics,the supports of SiC porous ceramics were prepared from SiC powder,potassium feldspar,quartz and kaolinite with graphite and activated carbon as pore-forming,and the supports were corroded in hydrochloric acid and NaOH solution with different solution concentration and erosion time. The corrosion degree was tested by scanning electron microscope,filtration pressure drop test system and Archimedes drainage method,while the corrosion mechanism of the supports in NaOH solution was also investigated. The results show that the resistance of supports to corrosion in hydrochloric acid solution is good,and the filtration pressure drop and the surfaces of supports are not obviously changed. There are no new crystalline substances generated on the sur-face of binder,which showed the resistance of supports to corrosion in hydrochloric acid solution is good. The corrosion of supports in relatively high concentration of NaOH solution is obvious,and the filtration pressure drop,surface profile and porosity are obviously affected by erosion time and solution concentration. The reason for the serious corrosion of supports in NaOH solution is that the binder of supports mainly in glass phase reacts with NaOH to form sodium aluminosilicate sol.
出处
《天津师范大学学报(自然科学版)》
CAS
2016年第2期28-32,共5页
Journal of Tianjin Normal University:Natural Science Edition
基金
国家自然科学基金资助项目(50872093)
关键词
SiC基多孔陶瓷支撑体
耐酸碱性
过滤压降
气孔率
support of SiC porous ceramics
acid-base resistance
filtration pressure drop
porosity