Strengthening of CFRC by Plasma Treatment with Mixed Gas of Oxygen and CF4

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Surface modification of PAN based carbon fiber (CF) was carried out by plasma treatment to obtain high compatibility between CF and matrix in CF paper/cement composites (CFRC). The plasma was generated by radio frequency discharge (13.56MHz) with O2 gas, CF4 gas, and the mixture of two gas. Wettability of CF surface to water was remarkably modified to be hydrophilic for flow ratio of 1.0 (O2 gas only) and 0.75 (O2/CF4=37.5sccm/12.5sccm) of mixed gas, and to be hydrophobic for flow ratio of 0 (CF4 gas only) and 0.25 (O2/CF4=12.5sccm/37.5sccm), while little modification was observed for flow ratio of 0.5 (O2/CF4=25sccm/25sccm). CF papers thus treated were used for the preparation of CFRC. CFRC plates (6mm thick) were prepared by laminating 11 sheets of CF paper preimpregnated with portland cement paste (water/cement 0.4), and curing it in water. These CFRC's bulk density showed the values of 1.39g/cm3 and CF content was 2.7vol%. The flexural strength and Young's modulus of CFRC plates could be controlled by regulating plasma treatment condition (discharge power, kind of gas, flow ratio of mixed gas). The flexural strength of CFRC plate prepared from plasma-treated CF with power of 50W and flow ratio of 0.75 (O2/CF4=37.5sccm/12.5sccm), was about 1.5 times (45MPa) that of CFRC plate prepared from non-plasma treated CF. CFRC plate prepared from CF paper pretreated with power of 150W and flow ratio of 0.75, has a flexural strength 2/3 times (18MPa) that of CFRC from plasma-untreated CF. These experimental results showed that flexural strength of CFRC plate prepared from plasma treated CF paper is affected by kind of gas, flow ratio of mixed gas, and discharge power of plasma.
炭素材料学会の論文

Strengthening of CFRC by Plasma Treatment with Mixed Gas of Oxygen and CF<SUB>4</SUB>

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