By D.S. Wilkinson (Eds.)

This overseas Symposium is backed via the fabrics Engineering part and the elemental Sciences element of the Metallurgical Society of CIM and co-sponsored via the Canadian Ceramic Society. issues lined comprise steel matrix composites, structural ceramics, polymeric composite fabrics, powder metallurgical fabrics and interfaces

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In the second step, the PG coated substrate is exposed to silane and hydrogen gases. The former decomposes to form beta silicon carbide (p SiC) continuously on the substrate. ) Various grades of fiber are produced, all of which are based on the standard SiC deposition process described above where a crystalline structure is grown onto the substrate. The io SiC is present as such across all of the fiber crosssection except for the last few microns at the surface. Here, by altering the gas flow in the bottom of the tubular reactor, the surface composition and struc- ADVANCED STRUCTURAL MATERIALS 63 ture of the fiber are modified by, first, an addition of amorphous carbon that heals the crystalline surface for improved surface strength, followed by a modification of the silicon-to-carbon ratio to provide bonding with the metal.

5. Gravity die cast Al-Si-Rice husk ash p a r t i c l e composite. Fig. 4. Gravity die cast Al-Si-Natural Graphite particle composite. litoipffB b*&ߧ2Ee*fcl 51 2 0 0 μπτΊ Fig. 6. Pressure die cast Al alloy-60% zircon particle composite. Jl·* Fig. 7. Modified eutectic Si in centrifugally cast 52MH} Al-Si-Graphite particle composite. 50 ADVANCED STRUCTURAL MATERIALS Fig. 8. A section of centrifugally cast Al-Si-Graphite composite bearing. Fig. 9. A section of centrifugal casting of Al-SiZircon particle composite.

The carbon monofilament spinning process is controlled to minimize these local anamalies sufficiently to guarantee routine production of high-strength >3450 MPa (> 500 ksi) SiC fiber. Another strength-limiting flaw which can result from an insufficiently controlled CVD process is the PG flaw(°). This flaw results from irregularities in the PG deposition. Two causes of PG flaws are: (1) disruption of the PG layer due to an anomaly in the carbon substrate surface and (2) mechanical damage to the PG layer prior to the SiC deposition.

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