Abstract

The sandwich structure is a composite structure that is widely used in aviation, construction, and other fields due to its superior performance. We have designed a vertical dual-temperature-zone-dual-channel chemical vapor infiltration/deposition system that includes a deposition zone and a preheating zone. Carbon fiber-reinforced matrix carbon composites are used as the inner and outer panels of the sandwich structural materials, while structurally designed metal grids are proposed as the core material. We establish flow, heat and mass transfer, and chemical reaction models to carry out optimal control of densification and the hot zone in the carbon/carbon-metal sandwich structure composite using numerical simulation methods. We use a single control variable approach, such as changing the mesh spacer size, heater temperature and length, and core-to-plate ratio, to explore the effects of different design parameters on the hot zone and densification of the carbon/carbon-metal sandwich structure composite. The results show that optimizing the heater power, the distribution of the metal grid, and other parameters can lead to lower Damkhler numbers. Consequently, higher axial temperature gradients and lower radial temperature gradients can be achieved during the densification process.

This content is only available via PDF.
You do not currently have access to this content.