Abstract
A model of Mamdani fuzzy system for isothermal chemical vapor infiltration (CVI) process of C/C composites was established. The influences of processing parameters, such as infiltration temperature, time, fiber volume fraction, gas volume flow rate and hydrocarbon concentration, were analyzed. The fiber volume fraction of preforms has significant effects on the bulk density and other properties of C/C composites. CVI processes are mainly determined by the pyrolysis reaction and the transportation of gas precursor. When the infiltration temperature and the ratio of hydrocarbon are raised, the pyrolysis reaction rate would be enhanced; so that the infiltration rate will be kept higher when the time is less than 300 h. Unfortunately, this will increase the nonuniformity of densification resulting in higher density gradient which make further densification harder.
| Original language | English |
|---|---|
| Pages (from-to) | 375-379 |
| Number of pages | 5 |
| Journal | Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research |
| Volume | 17 |
| Issue number | 4 |
| State | Published - Aug 2003 |
Keywords
- Chemical vapor infiltration
- Composite
- Fuzzy system
- Modeling