Microstructure and Mechanical Properties of ZrB2/Alumina/Mullite Composite Synthesized by Combined SHS and Direct Consolidation

A highly dense object of ZrB 2 /alumina/mullite composite was synthesized via combustion synthesis combined with a direct consolidation technique from a blend of zircon, aluminum, and boron oxide powders. The influences of preheating temperature; Al particle size; and compaction load on porosity, mi...

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Bibliographic Details
Published in:Combustion science and technology 2017-01, Vol.189 (10), p.1728-1738
Main Authors: Zaki, Z. I., Mohsen, Q., Mostafa, N. Y., Ahmed, Y. M. Z.
Format: Article
Language:English
Subjects:
Aluminum
Aluminum oxide
Boron
Boron oxides
Combustion
Combustion synthesis
Compaction
Composite
Consolidation
Cracks
Hardness
Heating
Ignition
Mechanical properties
Microstructure
Mullite
Particle size
Porosity
Self-propagating synthesis
Zircon
Zirconium diboride
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Summary:A highly dense object of ZrB 2 /alumina/mullite composite was synthesized via combustion synthesis combined with a direct consolidation technique from a blend of zircon, aluminum, and boron oxide powders. The influences of preheating temperature; Al particle size; and compaction load on porosity, microstructures, and mechanical properties of final products were investigated. Heating the sample prior to ignition led to development of cracks and coarser particle sizes, while increasing or decreasing the particle size of Al more or less than 37 µm led to inhomogeneous microstructure and cracks formation. Immediate application of 292 MPa contributed to a crack-free product of 1040 HV hardness and less than 1.0 vol% porosity with uniform microstructure. Detailed thermodynamic study of the combustion reaction is discussed.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2017.1327432