Two types of fiber reinforced prepreg were adopted to fabricate the composite materials; carbon fabric reinforced phenol prepreg(plain weave) and a carbon fabric reinforced epoxy prepreg(plain weave).
The fibers used in two prepregs were PAN based carbon fibers(T300, Toray, Japan.
All of the mechanical properties of carbon/epoxy composite were higher than carbon/phenol composite, such as tensile, compressive, shear.
However the friction coefficients of carbon/phenol composite was lower than carbon/epoxy composite.(The conditions of wear test(PV value) were same for the two composite materials)
I guess the results of wear test were based on the material propertie of epoxy and phenol resin.
If there is anynon to know, please explain the reson of the wear test.
So, the physical and mechanical properties of matrix (resin) have important significance. Yes, experiments show that strength of epoxide composites have higher strength but lower friction coefficients that phenol ones.
I do not know enough about your material combination to directly comment, but, the first step is to understand that Coefficient of Friction and Wear are NOT material properties: They are System Properties. Friction and wear of one material compared with other material, could be higher or lower depending upon the matching material tested.
In many cases high mechanical characteristics of materials aren't coinsides with frictional ones. For example, babbites (alloys based on plumbum) and many thermoplastic polymer composites have relatively low Young modulus and yield limit but used as antifrictional materials. Wear resistance of composites depends on cogesive strength, other words, adhesion of fibers and matrix. The gradient of mechanical properties in depth is a very important factor which determines the frictionl behaviour of subsurface layers of materials.
It is not clear to which surface the composite is mating and not sure about the material combination. First of all find the degradation temperature of both phenol and epoxy. Measure the rise in temperature using infra red sensor or by any other means at the interface. Check if the phenolic tend to degrade at temperatures below than epoxy . Then the phenolic resin tends to loose its binding capacity and hence the friction drops off.
You might check this work:
The effect of clearance upon friction of large diameter hip resurfacing prostheses using blood, clotted blood and bovine serum as lubricants
Chapter · January 2010
DOI: 10.1007/978-3-642-03889-1_112
In book: World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany, pp.418-420
OR
The Effect of cup deflection on friction in metal-on-metal bearings
Article in The Journal of Bone and Joint Surgery 90-B:552 · June 2008
Impact Factor: 4.31 ·
Saeed Afshinjavid
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