Hot isostatic pressing of tape cast metal matrix composites
- Concurrent Technologies Corp., Johnstown, PA (United States)
In the manufacture of metal matrix composite (MMC) preforms by tape slurry casting, common process characteristics are fiber-matrix interfacial damage and matrix porosity. While interfacial damage can be minimized by reducing the temperature gradients between the fibers and the slurry during manufacture, matrix porosity can only be eliminated by a consolidation cycle (e.g., hot isostatic pressing (HIP) or vacuum hot pressing (VHP)). Plastic flow and diffusion of the matrix material during HIP consolidation results in densification, porosity elimination and diffusion bonding. Models for the plastic flow and densification of porous materials have been previously given for relative densities between 0.6 and 1.0. These material models have been combined with finite element methods to predicate the densification behavior of Ti alloy/SiC composites. The effects of fiber distribution (square and hexagonal arrays) on the relative density evolution (or porosity elimination) have been quantified.
- OSTI ID:
- 442800
- Report Number(s):
- CONF-960515--; ISBN 0-87170-568-0
- Country of Publication:
- United States
- Language:
- English
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