|
Author(s): |
Xin-hai He, College of Mechanical & Electrical Engineering, Xi’an Polytechnic University, Shanxi Xi'an 710048,P.R.China
Jun-bo Wang, College of Mechanical & Electrical Engineering, Xi’an Polytechnic University, Shanxi Xi'an 710048,P.R.China
Ming-qian Shen, College of Mechanical & Electrical Engineering, Xi’an Polytechnic University, Shanxi Xi'an 710048,P.R.China
Hui Qin, College of Mechanical & Electrical Engineering, Xi’an Polytechnic University, Shanxi Xi'an 710048,P.R.China
Min-ge Yang, College of Mechanical & Electrical Engineering, Xi’an Polytechnic University, Shanxi Xi'an 710048,P.R.China
Chong Fu, College of Mechanical & Electrical Engineering, Xi’an Polytechnic University, Shanxi Xi'an 710048,P.R.China |
|
Abstract: |
Based on biotemplating, a new kind of Al2O3 morph-genetic ceramic materials with the microstructure of ramie fibers was prepared by molding into a billet and carbothermal-reduction under aerobic environment from ramie/Al(OH)3 precursors, which were prepared by impregnating Al(OH)3 sol into the pores of ramie fibers biotemplates using ultrasonic vibration technology. The formation mechanisms, phase composition and microstructure of the materials were analyzed and characterized respectively by using thermogravimetric analysis (TG), scanning electron microscope (SEM), X-ray diffraction (XRD) and some other experimental technology. The results showed that Al2O3 morph-genetic ceramic had the natural tracheid structure of ramie fibers. Under different sinter temperature,the products we get has different crystal type.The higher the temperature,the more stable the structure it becomes,the transformation is as follows: amorphous Al2O3 (nano-crystalline,<800℃)→γ-Al2O3(crystal,about in 1000℃)→α-Al2O3(crystal,>1200℃).
|