Effects of after-curing in the air and in N
2 gas on properties of the carbon-glass fiber composite are described.
The after-curing temperatures are 230, 250 and 300°C., and after-curing period is about 24 hours.
After-cured composites are carbonized at 1000°C in coke powder. The heating rates are as follows: 5°C/min for the temperatures ranging from the room temperature to 200°C, 10°C/hr for temperature ranging from 200 to 280°C, 2.5°C/hr from 280 to 500°C, and 7.5°C/hr for temperature ranging from 500 to 1000°C.
Two kinds of glass-cloth phenol resin laminates are used as the samples; resin content of the sample I is about 30%, and that of the sample II is about 51%.
The effects of after-curing are as follows: No difference of the sample shrinkage by both after-curing and carbonization is observed between the specimen cured in the air and that in N
2 gas at all after-curing tempera tures. Moreover, there is no significant difference of glass content, real density, bulk density, and porosity between these samples cured in different atmospheres. The weight loss by after-curing for the sample I in the air is smaller than that in N2 gas to 250°C, but for the sample II, no difference is observed.
Flexural strength of the carbonized sample increases with the after-curing temperature . Flexural strength of the sample after-cured in the air is larger than that after-cured in N
2 gas throughout the curing temperatures investigated.
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