the bonding

The most important and difficult problem associated with the fabrication of composite materials, is the production of good bonding between the fibers and the matrix. The transfer of load which is the principal objective of the reinforcement of week matrices by the high modules high strength fibers depends, first of all on good bonding, a good adhesion between the composite components. Without bonding there is no transfer of load to the fibers and hence no reinforcement. On country the fibers behave as holes inside the matrix.
The microstructure forms with a minimum surface energy between the fibers and the matrix, and hence the structure is both stable and well bounded. The good bonding may be promoted by:
1. Mutual interfacial diffusion restricted the formation of a solid solution.
2. Superficial non-detrimental chemical reaction
3. Perfect interfacial and contact between the components which excludes any existing contamination layers at the interfaces.
Liquid phase bonding:
This is realized when the matrix is liquid during fabrication and wets the fibers. A bonding can only be released by wettability of the fibers by the metals matrix wetting requires either a certain degree of physical or chemical affinity. This affinity requirement is both:
(When there is partial solubility or when the forbidden detrimental chemical reaction initiates material)
Wetting properties depend on mutual physical affinity between the components and this depends on the ratio of their respective surface energy values.