Songxue Wang,Jiayu Tian,Qiao Wang,Zhiwei Zhao,Fuyi Cui,Guibai Li
A copper oxide (CuO) doped alumina ceramic hollow fiber membrane was fabricated via combined phase-inversion and liquid-phase sintering technique at low sintering temperature , with the purpose to enhance the flexural strength and reduce the preparation cost. The effect of CuO contents on the microstructure and properties of the ceramic hollow fiber membrane was systematically investigated. The results showed that the 3 wt% CuO doped ceramic hollow fiber membrane sintered at 1250 °C for 2 h displayed a maximum flexural strength (116.78 MPa), which was more than 3 times higher than that of control membrane without CuO addition. The 3 wt% CuO doped ceramic hollow fiber membrane exhibited a porosity of 34.6%, mean pore size of 700 nm and pure water flux of 1255 L m −2 h −1 bar −1 . Furthermore, the catalytic performance of CuO doped ceramic hollow fiber membrane was investigated. With RhB as a model compound, it was shown that as high as 81.5% of degradation efficiency could be achieved by the 3 wt% CuO doped membrane in the combined peroxymonosulfate/membrane filtration system within 60 min. The CuO doped ceramic hollow fiber membrane displayed an excellent reusability in multicycle catalytic experiment and superior catalytic performance for various refractory organic pollutants .
Hanqin Liang,Huilu Guo,Jinwei Yin,Kaihui Zuo,Yongfeng Xia,Dongxu Yao,Jian Zhang,Yuping Zeng,Shiwei Wang
Transparent AlON ceramics were bonded with Lu-Al-Si-O-N oxynitride glass interlayer at 1450 °C in nitrogen atmosphere in this investigation. The Lu-Al-Si-O-N oxynitride glass showed good wettability on the AlON substrate and had strong interface adhesion with each other. The joining process had no detrimental effect on the in-line transmittance of transparent AlON ceramics but caused slight decrease of flexural strength due to the partial decomposition. The bonding strength of AlON/AlON joint was 142.7 ± 6.3 MPa at room temperature and 110.1 ± 9.6 MPa at 1200 °C in situ, which were comparable with those of the parent AlON ceramics. Some Lu 2 Si 2 O 7 grains crystallized out from the glass interlayer after joining.
Linchao Wang,Junwei Liu,Liying Shen,Chuyan Hu,Zhenhui Huang,Baihan Wang,Chao Xu,Qiang Liu
The probe into development of lightweight magnesium matrix composites (MMCs) able to operate at high temperatures exceeding 300 °C is of vital importance in producing structural components in aerospace and automotive industries. In this work, a range of new lamellar ceramic/Mg composites were prepared via infiltrating molten Mg alloy into porous ceramic scaffolds. Due to the introduction of the specific microture, the composites showed excellent mechanical properties at temperatures above 300 °C. The high temperature mechanical properties of the new MMC are proportional to the ceramic content, enhancing the flexural strength from 197 MPa to 287 MPa at 300 °C, demonstrating a 45.69% increase. Additionally, as the test temperature increased, the flexural strength of the optimal composites rose firstly and then decreased, in which showed its maximum (407 MPa) at 200 °C. It delivered the flexural strength of 287 MPa at 300 °C, which was basically identical to that at 25 °C. It is worth mentioning that it has almost never been achieved in previous studies. The results of this research provide new design ideas and lay foundation for further investigation of the magnesium matrix composites capable of working at temperatures above 300 °C.
危险品化学品经营许可证（带存储）