Surface Treatment Of Carbon Fibers Research Articles

Matrix modification by graphite powder additives in carbon fiber/carbon composite with thermosetting resin precursor as a matrix

Carbon fiber/thermosetting resin matrix precursor modified by graphite powder heat treated at 1000°C and at 3000°C was prepared. Flexural strength and fracture pattern of the composites were observed. Small addition (5–10%) of graphite powder to matrix precursor was effective on the strength of both types of carbonized composites, and graphitized ones with non-surface-treated fiber but was not so effective on that of the graphitized composite with surface-treated carbon fiber. Small addition of graphite powder gave ductility to the carbonized matrix and decreased interfacial gaps in the graphitized composite with non-surface-treated fibers. However, a large amount of graphite powder addition was less effective, due to the matrix inhomogeniety.

A study of the surface of carbon fiber by means of X-ray photoelectron spectroscopy—III

This paper reports a study of the surface composition of carbon fibers treated by various methods by means of X-ray photoelectron spectroscopy (SPS). C 1 S X-ray photoelectron spectra showed that after the surface treatment of carbon fibers, the carbon atoms in the hydrocarbon were changed into ▪ etc. oxygen-containing groups, that is, the results of surface oxidation and concentration increased with time but finally reached a constant level. Comparing experimental results for the treatments used, we found that all of these methods resulted in concentrations of oxygen groups on the surface in the order: ▪. Evidence was found for the formation of lactone groups ▪ during treatment in an oxygen or nitrogen plasma, but not during treatment by nitric acid or anodic oxidation.

Effect of surface treatment and sizing of c-fibres on the mechanical properties of cfr thermosetting and thermoplastic polymers

The paper describes a systematic study of oxidative surface treatment of carbon fibres by wet, dry and anodic oxidation. It is shown that in cases where thermosetting resins are used as the matrix, improvement of adhesion between fibre and matrix is caused by chemical interaction. The reactive surface oxides were identified by titration, desorption analysis and selective blocking treatment. The additional effect of sizing on adhesion between fibre and matrix is shown by reinforcement of thermoplastics such as polypropylene and polysulfone.

Preparation of Carbon fiber/Cement Composites from Surface-modified-carbon Fiber by Low Temperature Plasma

Surface modification of PAN based carbon fiber (CF) by low temperature plasma was investigated to give high compatibility between CF and matrix in CF/cement composites (CFRC). The surface treatment of CF was carried out with O2, Ar and CF4 plasmas generated by radio frequency (13.56 MHz). The wettability of water on CF surface was remarkably modified to hydrophilic by O2 and Ar plasmas, and to hydrophobic by CF4 plasma. Furthermore, the CF surface was analyzed by ESCA and observed by SEM. It was found that the acidic group on the CF surface was formed by O2 plasma, and the surface fluorination on CF was carried out by CF4 plasma.Then, the CF paper after plasma treatment was used for the preparation of CFRC. CFRC plates (6 mm in thickness) were prepared by the lamination of 12 sheets of CF paper preimpregnated with alumina cement paste, and were cured in water.These CFRC's showed 2.0 g/cm3 in bulk density and 3.6 vol% in CF contents. The flexural strength of these CFRC's prepared from plasma-treated CF, was about 10-12 times higher than that of alumina cement hydrate. The CFRC plates prepared from CF paper pretreated in O2 and Ar plasmas exibited 1.8 times higher in flexural strength (60MPa) and 1.5 times larger in deflection compared with the CFRC without plasma treatment on CF. The flexural strength (74MPa) and deflection of CFRC plates prepared from CF4 plasma-treated CF, were the largest all.Accordingly the low temperature plasma treatment of CF is regarded as an effective modifying method of CF for CFRC.

4401533 Surface-treatment of carbon fiber

4401533 Surface-treatment of carbon fiber

Role of fibre surface?matrix combination in carbon fibre reinforced epoxy composites

The effect of surface treatment of carbon fibres with concentrated as well as dilute nitric acid on the mechanical properties of carbon fibres has been reported. The role of the fibre—matrix interface in carbon fibre reinforced epoxy resin composites has been studied. Composites have been made both with untreated and surface treated carbon fibres and epoxy resin Araldite LY556 with different hardeners. Mechanical properties as well as fracture behaviour of these composites suggest that it is the physical interlocking between the fibres and the matrix, along with some chemical bonding between the two, and not the pure chemical bonding which yield better composites.

Surface treatment of carbon fibres : Goan, John C. (Great Lakes Carbon Corporation, New York, NY, USA) US Pat 4 216 262 (5 August 1980)

Surface treatment of carbon fibres : Goan, John C. (Great Lakes Carbon Corporation, New York, NY, USA) US Pat 4 216 262 (5 August 1980)

The influence of carbon fibre surface treatment on the mechanical properties of carbon/carbon composites

The influence of carbon fibre surface treatment on the mechanical properties of carbon/carbon composites

Effect of surface treatment of carbon fibers on the strength properties of carbon fiber plastics

The strength characteristics of composites based on carbon fibers having a coating of silicon carbide are in direct dependence on the coating thickness and on the porosity, which makes it possible to assume the possibility of increasing the degree of realization of the strength characteristics of fibers having a coating in a composite by increasing the degree of impregnation of the carbon cord with the binder. The latter finds confirmation also in the fact that at a small coating thickness on the carbon fiber (of the order of 5 nm) the porosity of the composite obtained is equal to the porosity of the material based on the carbon fiber without coating. Moreover, as is evident from Fig. 3c, the casing of silicon carbide does not form a continuous coatting over the whole perimeter of the cord. The presence of these prerequisites, and also the high resistance of carbon fibers having a silicon carbide coating to oxidation [9], open up wide prospects for creating new composite materials based on them.

The influence of carbon fibre surface treatment on the mechanical properties of carbon/carbon composites

The influence of carbon fibre type and carbon fibre surface treatment on the mechanical properties of phenolic-based, unidirectionally reinforced carbon/carbon composites has been investigated. It was found that only the reinforcement of carbon/carbon composites with untreated type I fibres results in best mechanical properties. Surprisingly in that case also an optimised surface treatment of the fibres improve the yield of fibre strength. The experimental results have shown that the applicability of the rule of mixtures for the precalculation of the strength of carbon/carbon composites is limited and that the fracture behaviour is controlled by the amount of adhesion between carbon fibres and carbon matrix.

Process for the surface treatment of carbon fibres: Fujimaki, H., Kodama, F., Takabe, R., Asano, K. and Seguchi, K. (Kureha Kagaku Kogyo Kabushiki Kaisha and Toyo Boseki Kabushiki Kaisha) US Pat 4 009 305 (22 February 1977)

Process for the surface treatment of carbon fibres: Fujimaki, H., Kodama, F., Takabe, R., Asano, K. and Seguchi, K. (Kureha Kagaku Kogyo Kabushiki Kaisha and Toyo Boseki Kabushiki Kaisha) US Pat 4 009 305 (22 February 1977)

The effect of fibre surface treatment, resin type and fabrication process on the interlaminar shear strength of carbon fibre composites

AbstractSome data related to the preparation of carbon fibre composites is summarised.A limited investigation concerned with presenting markedly different fibre surfaces to the resin by coating with metals and stearic acid is also described.There are carbon fibre surface treatments which lead to improved shear strength, but it is not clear how they are affecting the fibre surface. It also seems likely that some facets of the processing technique can have a large effect on composite quality as indicated by shear strength measurements.The difficulties in interpreting results and identifying sources of variability points to the advisability of statistically planned experiments to assess the significance of changes when investigating possible materials and processing improvements.

Tensile Strengths of Notched Composites

The tensile strengths of several different aligned fiber-epoxy resin com posites containing cracks perpendicular to the fibers have been measured as a function of crack size. The fibers were surface treated and surface untreated, high and low modulus, carbon; and S-glass. Thus, the effect of varied fiber- matrix bond strengths were observed. Surface treated carbon fiber com posites were notch-sensitive but the surface untreated carbon fiber compos ites and the glass fiber composites were notch-insensitive. This effect is due to differences in the shear strengths of the materials. The tensile strengths of the notch-sensitive materials are discussed in terms of various failure criteria, and it is shown that as the relative sharpness of cracks is increased, strengths tend towards the prediction of linear elastic fracture mechanics. The fracture surface energies of all these materials were measured by a work of fracture technique. The works of fracture of the carbon fiber composites are best explained by a model in which shear stress at the interface is maintained during pull-out. The works of fracture of the glass fiber composite are best explained by a debonding model.