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Materials 2009, 2(4), 2216-2227; doi:10.3390/ma2042216

Inorganic Polymer Matrix Composite Strength Related to Interface Condition

Composite Materials, Manufacture and Structures Laboratory, Mechanical Engineering, Colorado State Universtiy, Fort Collins, 80523-1374 Colorado, USA
Maine Maritime Academy, Castine, 04420 Maine, USA
Author to whom correspondence should be addressed.
Received: 31 October 2009 / Revised: 29 November 2009 / Accepted: 3 December 2009 / Published: 7 December 2009
(This article belongs to the Special Issue Composite Materials)
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Resin transfer molding of an inorganic polymer binder was successfully demonstrated in the preparation of ceramic fiber reinforced engine exhaust valves. Unfortunately, in the preliminary processing trials, the resulting composite valves were too brittle for in-engine evaluation. To address this limited toughness, the effectiveness of a modified fiber-matrix interface is investigated through the use of carbon as a model material fiber coating. After sequential heat treatments composites molded from uncoated and carbon coated fibers are compared using room temperature 3-point bend testing. Carbon coated Nextel fiber reinforced geopolymer composites demonstrated a 50% improvement in strength, versus that of the uncoated fiber reinforced composites, after the 250 °C postcure.
Keywords: geopolymer; inorganic polymer; ceramic matrix composite; engine valve geopolymer; inorganic polymer; ceramic matrix composite; engine valve
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Radford, D.W.; Grabher, A.; Bridge, J. Inorganic Polymer Matrix Composite Strength Related to Interface Condition. Materials 2009, 2, 2216-2227.

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