|
|||||
|
|
Rapid sintering of silicon nitride foams decorated with one-dimensional nanostructures by intense thermal radiation |
|
| Authors: | Duan Li Elisângela Guzi de Moraes Peng Guo Ji Zou Junzhan Zhang Paolo Colombo |
| Affiliation: | 1. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden;2. Berzelii Center EXSELENT on Porous Materials, Stockholm University, S-106 91 Stockholm, Sweden;3. Dipartimento di Ingegneria Industriale, University of Padova, Via Marzolo 9, I-35131 Padova, Italy;4. College of Materials and Mineral Resources, Xi’an University of Architecture and Technology, 710055 Xi’an, People’s Republic of China;5. Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16801, USA |
| Abstract: | Silicon nitride foams were prepared by direct foaming and subsequent rapid sintering at 1600 °C. The intense thermal radiation generated under the pressureless spark plasma sintering condition facilitated necking of Si3N4 grains. The prepared foams possessed a porosity of ～80 vol% and a compressive strength of ～10 MPa, which required only ～30 min for the entire sintering processes. Rapid growth of one-dimensional SiC nanowires from the cell walls was also observed. Thermodynamic calculations indicated that the vapor–liquid–solid model is applicable to the formation of SiC nanowires under vacuum. |
| Keywords: | silicon nitride foam spark plasma sintering nanowire thermodynamics |