RMX Technologies (Knoxville, TN, US) and the US Department of Energy’s Oak Ridge National Laboratory (ORNL, Oak Ridge, TN) have signed an exclusive licensing agreement for a new technology that is designed to dramatically reduce the time and energy needed in the production of carbon fiber.
The ORNL/RMX plasma processing technology is a new approach to the oxidation stage of carbon fiber production in which polymer materials are oxidized (or stabilized) before carbonization. During oxidation, the thermoplastic precursor is converted to a thermoset material that can no longer be melted. Oxidation is the most time-consuming phase of the multistep carbon fiber conversion process.
“In conventional systems, it generally takes between 80 and 120 minutes for oxidation,” says Felix Paulauskas, co-inventor of RMX Technologies' plasma technology. “We found a way to cut the time by a factor of two-and-a-half to three times, so we can process fiber in 25 to 35 minutes.”
Compared to conventional oxidation techniques, the team’s plasma oxidation technology reduces unit energy consumption by 75% and reduced production costs by 20%, while maintaining or improving the resulting carbon fiber quality. Plasma oxidation can be used to produce all grades of carbon fiber from low-end industrial to high-end aerospace grades.
Paulauskas developed the scientific concept for the plasma oxidation method eight years ago and worked with RMX Technologies to develop prototypes and demonstrate the technology at the lab scale. In 2014, RMX constructed a 1-ton plasma oxidation oven at its facility and transitioned from development to scaling and commercialization the following year.
“We are commercializing this technology with our industrial partners to manufacture low-cost carbon fiber and create quality jobs,” RMX Technologies president Rodney Grubb says. “Through our partnership with ORNL, we have proven 75%energy savings, we make a quality fiber and the equipment uses less than half the space. One of our carbon fiber production partners told us, ‘Plasma oxidation is not a science project anymore. The technology works.’”
Grubb says the company is preparing quotes with its commercial partner, C. A. Litzler, a manufacturer of carbon fiber production equipment, and expects to sell its first plasma oxidation oven in 2017. An RMX subsidiary, 4M Industrial Oxidation, will jointly manufacture and license the technology with C. A. Litzler.
“Commercialization of this technology can accelerate the use of carbon fiber in the auto industry and expand into other areas where strong and lightweight materials provide benefits,” says Truman Bonds, RMX Technologies' vice president for research and development.
DOE’s Vehicle Technologies Office has funded ORNL’s research in plasma oxidation of carbon fiber.
Editor PickMelt-spinning carbon fiber precursor begins in Australia
Australian R&D center CSIRO is working on melt-spinning polymers to produce precursors for carbon fiber. Polymers being used include polyacrylonitrile, cellulose, lignin and blends of these materials. Q&A with Derek Buckmaster.