Preparation and characteristics of highly porous BN-Si3N4 composite ceramics by combustion synthesis |
| |
| Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100190, China;3. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China;1. School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), Weihai 264209, PR China;2. Key Laboratory of High Ef?ciency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;3. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, PR China;1. School of Metallurgy, Northeastern University, No. 3-11, Wenhua Road, Heping District, Shenyang, Liaoning 110819, PR China;2. Department of Materials Science and Engineering, and Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea;1. School of Materials Science and Engineering, Xi''an University of Technology, Xi’an, Shaanxi 710048, China;2. Advanced Material Analysis and Test Center, Xi’an University of Technology, Xi’an, Shaanxi 710048, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China;2. School of Materials Engineering, Xi’an Aeronatical University, Xi’an 710077 China;3. Shaanxi Huaqin Technology Industry Co., Ltd, Xi’an, China;4. Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;5. The Third Affiliated Hospital of Air Force Medical University, Xi’an 710032, Shaanxi, China;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2. Hefei Shengda Electronic Technology Industry Co. Ltd., Hefei 230088, China;3. 43rd Institute, China Electronics Technology Group Corporation, Hefei 230088, China;4. Anhui Province Key Laboratory of Microsystem, Hefei 230088, China |
| |
| Abstract: | Nitride based ceramics are considered as a kind of promising material for structural and functional integration due to their robust structure, extreme environmental resistance and electromagnetically transparency. It is still challenging to prepare nitride based ceramics with homogeneous and controllable microstructure because of their low self-diffusion coefficient and difficulty in sintering. Here, we developed a gelcasting-SHS process by combining gelcasting forming and self-propagating high temperature synthesis (SHS) for the preparation of porous BN-Si3N4 composite ceramics. First, carbon residue problem in the gelcasting -SHS process was studied. Based on the result, porous BN-Si3N4 composite ceramics with high porosity (69.42 ~ 86.48%), high strength (21.7 ~ 81.0 MPa) and low dielectric constants (1.42 ~ 2.87) were synthesized. In addition, the thermal shock resistance of porous BN-Si3N4 composite ceramics until 1000 ℃ was evaluated. |
| |
| Keywords: | Gelcasting Combustion synthesis High porosity Composite ceramics |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
