Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 624

Full Record for Micrograph 624

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Micrograph no
624
Brief description
Inter-particle bond in the fire-resistant composite Barrikade (R)
Keywords
Barrikade, composite material Link to MATTER Glossary entry for composite material, edible, filler Link to MATTER Glossary entry for filler, fire resistant, thermal, vermiculite, ZnO
Categories
Composite
System
Barrikade
Composition
Expanded vermiculite, cured in ZnO and mixed with binder
Standard codes
Reaction
The ZnO cure makes the system water-resistant
Processing
Exfoliated vermiculite particles are first mixed with a binder and ZnO, then cured at 100 degrees C. The treatment is then repeated with the particles pressed into a mould and dried.
Applications
Barrikade (r) is a light-weight, inexpensive, edible, space-filling composite which is water resistant. It also has moderate thermal conductivity and is fire-resistant, making it a suitable fire-retarding material.
Sample preparation
A sample has been mounted in resin and cross-sectioned.
Technique
Scanning electron microscopy (SEM) in backscattered electron imaging (BEI) mode
Length bar
100 μm
Further information
This cross-section shows a typical bond, made between the two expanded vermiculite particles by the water soluble glass (sodium silicate) which is used as a binder. The flow of the binder towards such necks is driven by surface tension.
Contributor
R Goodall
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
03/10/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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