The high temperature compressive strength of non-oxide ceramic foams

A. A. Wereszczak; E. Liu; V. Heng; T. P. Kirkland; M. K. Ferber

doi:10.1016/S0921-5093(96)10482-2

The high temperature compressive strength of non-oxide ceramic foams

A. A. Wereszczak, E. Liu, V. Heng, T. P. Kirkland, M. K. Ferber

Mechanical Properties and Mechanics

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The compression strengths of five coated vitreous carbon foams under development were measured at 25, 1000, 1200 and 1400°C. Only qualitative trends in the measured strengths were obtainable due to a numerical lack of specimens. One developmental foam was a pyrolytic carbon (PC)-coated reticulated vitreous carbon (RVC) foam, and it was tested in argon at the three elevated temperatures. Four developmental RVC foams had chemical vapor infiltration (CVI)-SiC coatings on them, each with different coating thicknesses and consequential different bulk densities; these SiC-RVC foams were tested in ambient air at the elevated temperatures. The strength of the PC-RVC foam was independent of temperature up to 1400°C in argon. The compressive strengths of the SiC-RVC foams having the two thinnest coatings (or the two smallest bulk densities) were equivalent in ambient air to those of the PC-RVC foam in argon up to 1400°C5 while the SiC-RVC foams having the two thickest coatings (or the two greatest bulk densities) were consistently stronger. These results show thin-SiC layered SiC-RVC foams grant oxidation protection that PC-RVC foams do not possess to 1400°C, and that thicker SiC layers on SiC-RVC foams are required for added strength.

Original language	English
Pages (from-to)	224-228
Number of pages	5
Journal	Materials Science and Engineering: A
Volume	219
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(96)10482-2
State	Published - Nov 30 1996

Funding

This research was sponsored by the US Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, under Contract DE-AC05-96OR22464, managed by Lockheed Martin Energy Research Corporation. The authors wish to thank Drs. W.Y. Lee, A.E. Pasto and T.R. Watkins for reviewing the manuscript and for their helpful comments.

Funders	Funder number
Office of Transportation Technologies	DE-AC05-96OR22464
US Department of Energy
Lockheed Martin Corporation
Office of Energy Efficiency and Renewable Energy

Keywords

Ceramic foams
Chemical vapor infiltration
Pyrolytic carbon

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10.1016/S0921-5093(96)10482-2

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abstract = "The compression strengths of five coated vitreous carbon foams under development were measured at 25, 1000, 1200 and 1400°C. Only qualitative trends in the measured strengths were obtainable due to a numerical lack of specimens. One developmental foam was a pyrolytic carbon (PC)-coated reticulated vitreous carbon (RVC) foam, and it was tested in argon at the three elevated temperatures. Four developmental RVC foams had chemical vapor infiltration (CVI)-SiC coatings on them, each with different coating thicknesses and consequential different bulk densities; these SiC-RVC foams were tested in ambient air at the elevated temperatures. The strength of the PC-RVC foam was independent of temperature up to 1400°C in argon. The compressive strengths of the SiC-RVC foams having the two thinnest coatings (or the two smallest bulk densities) were equivalent in ambient air to those of the PC-RVC foam in argon up to 1400°C5 while the SiC-RVC foams having the two thickest coatings (or the two greatest bulk densities) were consistently stronger. These results show thin-SiC layered SiC-RVC foams grant oxidation protection that PC-RVC foams do not possess to 1400°C, and that thicker SiC layers on SiC-RVC foams are required for added strength.",

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AB - The compression strengths of five coated vitreous carbon foams under development were measured at 25, 1000, 1200 and 1400°C. Only qualitative trends in the measured strengths were obtainable due to a numerical lack of specimens. One developmental foam was a pyrolytic carbon (PC)-coated reticulated vitreous carbon (RVC) foam, and it was tested in argon at the three elevated temperatures. Four developmental RVC foams had chemical vapor infiltration (CVI)-SiC coatings on them, each with different coating thicknesses and consequential different bulk densities; these SiC-RVC foams were tested in ambient air at the elevated temperatures. The strength of the PC-RVC foam was independent of temperature up to 1400°C in argon. The compressive strengths of the SiC-RVC foams having the two thinnest coatings (or the two smallest bulk densities) were equivalent in ambient air to those of the PC-RVC foam in argon up to 1400°C5 while the SiC-RVC foams having the two thickest coatings (or the two greatest bulk densities) were consistently stronger. These results show thin-SiC layered SiC-RVC foams grant oxidation protection that PC-RVC foams do not possess to 1400°C, and that thicker SiC layers on SiC-RVC foams are required for added strength.

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The high temperature compressive strength of non-oxide ceramic foams

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