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| Effects of Infiltration Temperature and Time on the Properties of C/C-SiC-ZrC Composites Fabricated by RMI |
| Received:February 03, 2016 Revised:June 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.03.014 |
| KeyWord:reactive melt infiltration (RMI) C/C-SiC-ZrC flexural strength |
| Author | Institution |
| KONG Ying-jie |
Aerospace Research Institute of Special Materials and Processing Technology, Beijing , China |
| YU Xin-min |
Aerospace Research Institute of Special Materials and Processing Technology, Beijing , China |
| PEI Yu-chen |
Aerospace Research Institute of Special Materials and Processing Technology, Beijing , China |
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| Abstract: |
| Objective To investigate the effects of infiltration temperature and infiltration time on the density and flexural strength of C/C-SiC-ZrC composite. Methods Carbon fiber felt was firstly infiltrated by Chemical Vapor Infiltration (CVI) combined with Precursor Infiltration Pyrolysis (PIP) to obtain the porour C/C perform, and then Carbon fiber reinforced carbon-silicon carbide-zirconium carbide (C/C-SiC-ZrC) composites were prepared by Reactive Melt Infiltration (RMI) with Si0.9-Zr0.1 alloy. The opening rate, density and flexural strength of C/C-SiC-ZrC composite were tested. Results The density of C/C-SiC-ZrC composite was only 1.97 g/cm3, and the flexural strength was only 153 MPa with the infiltration temperature of 1450 ℃. While the infiltration temperature rose to 1550 ℃, the density and flexural strength increased respectively to 2.39 g/cm3 and 260 MPa. With the infiltration temperature further rose to 1650 ℃, the density and flexural strength decreased respectively to 2.18 g/cm3 and 208 MPa. When the infiltration time was 1.5 hours, the density of 2.46 g/cm3 was the highest, increased by 5.1% than the density with the infiltration time of 0.5 hour. While the infiltration time was 1.0 hour, the highest flexural strength was 260 MPa, increased by only 3.1% than the flexural strength with the infiltration time of 1.5 hours. Conclusion The density and flexural strength of C/C-SiC-ZrC composites increased firstly and then decreased with the increase of infiltration temperature. With the increase of infiltration time, the density of C/C-SiC-ZrC composites increased, but the flexural strength increased firstly and then decreased. The influence of infiltration time was relatively small. |
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