Morphological optimization of process parameters of randomly oriented carbon/carbon composite

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 15권 / 1호
ㆍ저자명 : Thakur Sudesh Kumar Raunija, Sushant Krunal Manwatkar, Sharad Chandra Sharma, Anil Verma

목차

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusions
Acknowledgements
References

한국어 초록

A microstructure analysis is carried out to optimize the process parameters of a randomlyoriented discrete length hybrid carbon fiber reinforced carbon matrix composite. The compositeis fabricated by moulding of a slurry into a preform, followed by hot-pressing andcarbonization. Heating rates of 0.1, 0.2, 0.3, 0.5, 1, and 3.3°C/min and pressures of 5, 10, 15,and 20 MPa are applied during hot-pressing. Matrix precursor to reinforcement weight ratiosof 70:30, 50:50, and 30:70 are also considered. A microstructure analysis of the carbon/carbon compacts is performed for each variant. Higher heating rates give bloated compactswhereas low heating rates give bloating-free, fine microstructure compacts. The compactsfabricated at higher pressure have displayed side oozing of molten pitch and discrete lengthcarbon fibers. The microstructure of the compacts fabricated at low pressure shows a lack ofdensification. The compacts with low matrix precursor to reinforcement weight ratios haveinsufficient bonding agent to bind the reinforcement whereas the higher matrix precursor toreinforcement weight ratio results in a plaster-like structure. Based on the microstructureanalysis, a heating rate of 0.2°C/min, pressure of 15 MPa, and a matrix precursor to reinforcementratio of 50:50 are found to be optimum w.r.t attaining bloating-free densificationand processing time.

영어 초록

A microstructure analysis is carried out to optimize the process parameters of a randomly
oriented discrete length hybrid carbon fiber reinforced carbon matrix composite. The composite
is fabricated by moulding of a slurry into a preform, followed by hot-pressing and
carbonization. Heating rates of 0.1, 0.2, 0.3, 0.5, 1, and 3.3°C/min and pressures of 5, 10, 15,
and 20 MPa are applied during hot-pressing. Matrix precursor to reinforcement weight ratios
of 70:30, 50:50, and 30:70 are also considered. A microstructure analysis of the carbon/
carbon compacts is performed for each variant. Higher heating rates give bloated compacts
whereas low heating rates give bloating-free, fine microstructure compacts. The compacts
fabricated at higher pressure have displayed side oozing of molten pitch and discrete length
carbon fibers. The microstructure of the compacts fabricated at low pressure shows a lack of
densification. The compacts with low matrix precursor to reinforcement weight ratios have
insufficient bonding agent to bind the reinforcement whereas the higher matrix precursor to
reinforcement weight ratio results in a plaster-like structure. Based on the microstructure
analysis, a heating rate of 0.2°C/min, pressure of 15 MPa, and a matrix precursor to reinforcement
ratio of 50:50 are found to be optimum w.r.t attaining bloating-free densification
and processing time.

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