Tuning Microstructure of Mesophase Pitch Carbon Fiber by Altering the Carbonization Ramp Rate

Scherschel, Alexander; Harrell, Timothy; Sushchenko, Andriy; Knight, Eli; Brown, Kenneth R.; Li, Xiaodong

doi:10.1002/adem.202400110

Tuning Microstructure of Mesophase Pitch Carbon Fiber by Altering the Carbonization Ramp Rate

Journal Article · Mon May 06 00:00:00 EDT 2024 · Advanced Engineering Materials

DOI:https://doi.org/10.1002/adem.202400110· OSTI ID:2475995

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University of Virginia, Charlottesville, VA (United States); University of Virginia
University of Virginia, Charlottesville, VA (United States)

The microstructure of mesophase pitch carbon fibers (CFs) are tuned by varying ramp rates from 1 to 50 °C min^–1 up to 1000 °C to study the effect of ramp rate on CFs’ microstructure, thermal and mechanical properties with the goal of offsetting the cost by decreasing cycle time. The ramp rates represent carbonization times ranging from 16.4 to 1.17 h, not including cool down. Differential scanning calorimetry, thermogravimetric analysis, and derivative thermogravimetry are used to investigate the impact ramp rate has on the thermal properties of mesophase pitch. It is found that lower ramp rates are endothermic in nature with a lower temperature onset and maximum weight loss. Higher ramp rates possess an exothermic nature with higher temperatures resulting in maximal weight loss over a smaller range of temperatures. Mechanical testing shows varying CF strengths and moduli dependent on ramp rate and an optimized process is developed to produce the strongest CF. Furthermore, microstructural characterization revealed that faster ramp rates lead to smaller interplanar spacings and larger crystallites but possessed greater disorder.

View Accepted Manuscript (DOE)

Research Organization:: University of Virginia, Charlottesville, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)

Grant/Contract Number:: EE0009239

OSTI ID:: 2475995

Alternate ID(s):: OSTI ID: 2550707

Journal Information:: Advanced Engineering Materials, Journal Name: Advanced Engineering Materials Journal Issue: 12 Vol. 26; ISSN 1438-1656

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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