本文基于喷雾干燥过程的基本理论，以煅烧高岭土为原料，采用喷雾干燥法制备高岭土生坯微球。探讨了浆料浓度、进口温度、喷雾压力等工艺因素对微球的粒径与形貌的影响。研究了喷雾干燥成型的机理。通过实验优化工艺参数，得到在喷雾压力1．2MPa时，保持进口温度140℃不变，对浓度为25％的高岭土浆料进行喷雾干燥造粒得到的微球球形度最好，粒径分布最均匀。对高岭土微球进行二次烧结可以制得高强度、高硬度、表面光滑的单分散陶瓷微球。本技术为微米级陶瓷微球的制备提供了新的方法。
Based on the basic theory of spray drying process, green micron ceramic microspheres were prepared through spray drying method by using metakaolinite as the raw material. Slurry concentration, inlet temperature and spray pressure were taken into account to explore their influences on the particle size and morphology and formation mechanism of the microspheres. Through the experiments to optimize process parameters, it is found that processing under the condition including the spray pressure of 1.2MPa, the inlet temperature of 140℃ and the slurry's solid content of 25 wt~ can give almost perfect microspheres with uniform particle size. After the secondary sintering, high sphericity and highly dispersed metakaolinite microspheres with high strength, high hardness and smooth surfaces can be obtained. The secondary sintering following the spray drying can become a new method to manufacture microns ceramic microspheres.
参考文献
| [1] | 程小苏,曾令可,王慧,刘平安,李秀艳.陶瓷微球的制备工艺及微球性能研究[J].过程工程学报,2004(z1):291-296. |
| [2] | 钟余发 .氧化铝基陶瓷微球的制备及其性能的研究[D].广州:华南理工大学,2010. |
| [3] | 李志强,李祥云,马奇,辛玲,王西.喷雾造粒技术在反应烧结SiC密封材料中的应用研究[J].流体机械,2007(07):40-43. |
| [4] | 初小葵,许壮志,乔木.Al2O3陶瓷粉料的喷雾干燥工艺要点[J].中国陶瓷,2002(06):25-27. |
| [5] | 马奇 .SiC—AIN水基料浆喷雾干燥及复相陶瓷的制备[D].杭州:浙江大学,2007. |
| [6] | 陆有军,吴澜尔,陈宇红.SiC喷雾造粒粉的影响因素研究[J].中国粉体技术,2007(05):5-6. |
| [7] | 唐文军,傅正义,张金咏,王玉成,王为民.TiB2/Al2O3复合粉体的喷雾干燥造粒与特性研究[J].陶瓷学报,2006(04):370-375. |
| [8] | Kuk Cho;Yong Jae Suh;Hankwon Chang .Synthesis of mesoporous CaCO3 particles by a spray drying method from the stable suspensions achieved in a beads mill[J].Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan,2010(2):145-149. |
| [9] | 汤传义.水的表面张力与温度的关系[J].安庆师范学院学报（自然科学版）,2000(01):73-74. |
| [10] | 陈宗淇;戴闽光.胶体化学[M].北京:高等教育出版社,1985 |
| [11] | Niesz D.E;Bennett R.B;Snyder M.J .Strength characterization of powder aggregates[J].Ceramic Bulletin,1992,51(09):677-680. |
| [12] | 廖传华;董金善;顾海明 等.喷雾干燥操作中传热过程[J].南京化工大学学报（自然科学版）,1998,20(13):87-89. |
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