| 摘要 |
<p>A process for densifying porous structures in a single cycle inside a furnace using non-pressure gradient CVI/CVD, the process comprises providing a furnace, the furnace defining an outer volume; assembling a multitude of porous structures and spacers In a stack with spacers between each pair of adjacent porous structures; disposing the stack of porous structures between a bottom plate and a top plate in the furnace, wherein the stack has a center open region extending through the stack and an outer region extending outside the stack, around the outside of said porous structures; providing a channel for fluid communication between the center open region and the outer region; allowing gas to flow through the center open region as well as the outer region; and densifying the porous structures at a pressure in the range of about 5-30 mm Hga in one cycle.</p> |
