Influence of hot-pressing pressure on the densification of short-carbon-fiber-reinforced, randomly oriented carbon/carbon composite

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 16권 / 1호
ㆍ저자명 : Thakur Sudesh Kumar Raunija and Sharad Chandra Sharma

목차

1. Introduction
2. Experimental Materials and Methods
3. Measurements
4. Results and Discussion
5. Conclusions
Acknowledgments
References

한국어 초록

The prime objective of this research was to study the influence of hot-pressing pressureand matrix-to-reinforcement ratio on the densification of short-carbon-fiber-reinforced, randomlyoriented carbon/carbon-composite. Secondary objectives included determination ofthe physical and mechanical properties of the resulting composite. The ‘hybrid carbon-fiberreinforcedmesophase-pitch-derived carbon-matrix’ composite was fabricated by hot pressing.During hot pressing, pressure was varied from 5 to 20 MPa, and reinforcement wt%from 30 to 70. Densification of all the compacts was carried at low impregnation pressurewith phenolic resin. The effect of the impregnation cycles was determined using measurementsof microstructure and density. The results showed that effective densification stronglydepended on the hot-pressing pressure and reinforcement wt%. Furthermore, results showedthat compacts processed at lower hot-pressing pressure, and at higher reinforcement wt%,gained density gradually during three densification cycles and showed the symptoms of furthergains with additional densification cycles. In contrast, samples that were hot-pressed atmoderate pressure and at moderate reinforcement wt%, achieved maximum density withinthree densification cycles. Furthermore, examination of microstructure revealed the formationof cracks in samples processed at lower pressure and with low reinforcement wt%.

영어 초록

The prime objective of this research was to study the influence of hot-pressing pressure
and matrix-to-reinforcement ratio on the densification of short-carbon-fiber-reinforced, randomly
oriented carbon/carbon-composite. Secondary objectives included determination of
the physical and mechanical properties of the resulting composite. The ‘hybrid carbon-fiberreinforced
mesophase-pitch-derived carbon-matrix’ composite was fabricated by hot pressing.
During hot pressing, pressure was varied from 5 to 20 MPa, and reinforcement wt%
from 30 to 70. Densification of all the compacts was carried at low impregnation pressure
with phenolic resin. The effect of the impregnation cycles was determined using measurements
of microstructure and density. The results showed that effective densification strongly
depended on the hot-pressing pressure and reinforcement wt%. Furthermore, results showed
that compacts processed at lower hot-pressing pressure, and at higher reinforcement wt%,
gained density gradually during three densification cycles and showed the symptoms of further
gains with additional densification cycles. In contrast, samples that were hot-pressed at
moderate pressure and at moderate reinforcement wt%, achieved maximum density within
three densification cycles. Furthermore, examination of microstructure revealed the formation
of cracks in samples processed at lower pressure and with low reinforcement wt%.

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