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Factors affecting the thermal shock resistance of several hafnia based composites containing graphite or tungstenThe thermal shock resistance of hafnia based composites containing graphite powder or tungsten fibers was investigated in terms of material properties which include thermal expansion, thermal conductivity, compressive fracture stress, modulus of elasticity, and phase stability in terms of the processing parameters of hot pressing pressure and/or density, degree of stabilization of the hafnia, and composition. All other parameters were held constant or assumed constant. The thermal shock resistance was directly proportional to the compressive fracture stress to modulus of elasticity ratio and was not affected appreciably by the small thermal expansion or thermal conductivity changes. This ratio was found to vary strongly with the composition and density such that the composites containing graphite had relatively poor thermal shock resistance, while the composites containing tungsten had superior thermal shock resistance.
Document ID
19740020124
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Lineback, L. D.
(North Carolina State Univ. Raleigh, NC, United States)
Date Acquired
August 7, 2013
Publication Date
January 14, 1974
Publication Information
Publication: Develop. of High Temp. Mater. for Solid Propellant Rocket Nozzle Appl.
Subject Category
Materials, Nonmetallic
Accession Number
74N28237
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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