摘要
为探讨机械粉碎法批量制备立方碳化硅纳米粉体的可行性,以平均粒径Dv(50)为2.49μm立方碳化硅为原料,采用具有一定实验体量的30 L型砂磨机对250 kg浆料进行砂磨实验研究。通过对砂磨产物的粒度、微观形貌、表面结构、Zeta电位等测试,分析了纳米碳化硅的粉碎机理及其表面特性。结果表明:砂磨过程中产物的粒径下降速率会发生数量级的变化,可将其划分为快速粉碎、慢速粉碎和均化、整形3个阶段。采用0.3~0.4 mm的碳化硅介质球,经砂磨40 h粒径可批量制备Dv(50)在100 nm,单颗粒粒径在30~50 nm的纳米颗粒,且粒度均匀,球形度良好。砂磨制得的纳米立方碳化硅,表面含有大量的羟基和二氧化硅,具有很好的亲水性,其表面特性与纳米二氧化硅相近。在pH≥7下分散稳定性良好,尤其在pH为9时Zeta电位绝对值最高可达60 mV以上,粒径达到最小值103 nm,分散稳定性最好。表明砂磨制备的纳米立方碳化硅在中性和碱性条件下具有良好的分散稳定性,可用于机械抛光、陶瓷湿法成型、涂层等工业应用领域。
In order to investigate the feasibility of preparing nano cubic SiC powder by mechanical crushing,the SiC micropowders with an average particle size Dv(50)of 2.49μm was used as raw materials,and 250 kg slurry was grinded with 30 L type grinder.The grinding mechanism and properties of SiC nanoparticles were explored by testing the particle size,microstructure,surface structure and Zeta potential of the grinding product.The results show that the partical size of the product in the process of grinding decreases by orders of magnitude,with three stages divided:fast grinding,slow grinding,homogenization and shaping.After grinding for 40 h by using silicon carbide dielectric spheres of 0.3~0.4 mm,the nano-particles with Dv(50)of 100 nm can be prepared in batches,and the single particle size reaches 30~50 nm,with the particle size uniform and the sphericity satisfactory.The surface of nano-SiC contains a large amount of hydroxyl and silicon dioxide,which have good hydrophilicity,and its surface characteristics are similar to those of nano-silicon dioxide.The dispersion stability is good when pH≥7,especially when pH being 9,the absolute value of Zeta potential can reach more than 60 mV,and the particle size reaches the minimum 103 nm,with the dispersion stability best.The results show that the nano-cubic SiC prepared by sand grinding has good dispersion stability under neutral and alkaline conditions.It can be used in mechanical polishing,ceramic wet forming,coating and other industrial applications.
作者
邓丽荣
王晓刚
华小虎
陆树河
王嘉博
王行博
DENG Lirong;WANG Xiaogang;HUA Xiaohu;LU Shuhe;WANG Jiabo;WANG Hangbo(College of Materials Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Xi’an Boer New Material Co.,Ltd.,Xi’an 710089,China;Center of Engineering Training,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《西安科技大学学报》
CAS
北大核心
2021年第6期1076-1082,共7页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(51602254)
西安市先进制造业技术攻关项目(21XJZZ0040)。
关键词
立方碳化硅
纳米颗粒
砂磨
粉碎机理
表面特性
cubic silicon carbide
nanoparticles
sand grinding
crushing mechanism
surface property
