词条 | Silicon carbide fibers |
释义 |
There are several manufacturing approaches to making silicon carbide fibers.[7][8] The one with the longest historical experience, invented in 1975 and called the Yajima process,[9] uses a pre-ceramic liquid polymer that is injected through a spinneret to produce solidified green (unfired) fibers that go through a series of processing steps, including significant time in high temperature furnaces to convert the polymer to the desired SiC chemistry. These fibers are typically smaller than 20 microns in diameter and supplied as twisted tows containing 300+ fibers. Several companies employ some variation of this technique, including Nippon Carbon (Japan), Ube Industries (Japan), and the NGS consortium (USA){{citation needed|date=March 2018}}. A second approach utilizes chemical vapor deposition (CVD) to form silicon carbide on a central core of a dissimilar material as the core traverses a high temperature reactor. Developed by Textron (now Specialty Materials Inc located in Massachusetts[12]) over 40 years ago, the silicon carbide deposit resulting from the gas-phase CVD reaction builds up on a carbon core with a columnar microstructure. The fiber, sold as the SCS product family, is relatively large in diameter, measuring from approximately 80 to 140 microns. Laser-driven CVD (LCVD) is a related approach using multiple laser beams as the energy source to incite the gas phase reaction, with the significant difference that the fibers are grown as-formed and not on any core structure[15],[16],[17]. The LCVD fibers are fabricated in a parallel array as each laser beam corresponds to a deposited fiber, with growth rates ranging from 100 microns to over 1 millimeter per second and fiber diameters ranging from 20 to 80 microns. Free Form Fibers, based in upstate New York, has developed the LCVD technology for the past 10 years. See also
References1. ^1 {{Citation | inventor1-last = Yajima | inventor1-first = Seishi | inventor2-last = Hayashi | inventor2-first = Josaburo | inventor3-last = Omori | inventor3-first = Mamoru | title = Method for producing organosilicon high molecular weight compounds having silicon and carbon as main skeleton components and said organosilicon high molecular weight compounds | issue-date = 1977-10-04 | patent-number = 4,052,430 | country-code = US }} [1][2][3][4][5][6][7][8]2. ^1 Website of CFM, the joint venture manufacturer (between GE and Saffran Aircraft Engines) of the LEAP engine, https://www.cfmaeroengines.com/engines/leap/ 3. ^1 {{cite web|url=http://accuratus.com/silicar.html |title=Silicon Carbide SiC Material Properties |publisher=Accuratus.com |date= |accessdate=2018-03-30}} 4. ^1 {{cite web|url=http://specmaterials.com/companyhistory.htm |title=Specialty Materials, Inc. - History |publisher=Specmaterials.com |date= |accessdate=2018-03-30}} 5. ^1 {{cite web|url=http://ceramics.org/ceramic-tech-today/how-to-knit-silicon-carbide-fibers |title=How to knit silicon carbide fibers | The American Ceramic Society |doi=10.1002/adem.201100192 |publisher=Ceramics.org |date=2012-07-03 |accessdate=2018-03-30}} 6. ^1 Maxwell, James & Chavez, Craig & W. Springer, Robert & Maskaly, Karlene & Goodin, Dan. (2007). “Preparation of superhard BxCy fibers by microvortex-flow hyperbaric laser chemical vapor deposition”, Diamond and Related Materials v 16. pp. 1557-1564 7. ^1 T. Wallenberger, Frederick & C. Nordine, Paul & Boman, Mats. (1994). “Inorganic fibers and microstructures directly from the vapor phase”. Composites Science and Technology v 51. pp. 193-212. 8. ^1 Maxwell, James & Boman, Mats & W Springer, Robert & Narayan, Jaikumar & Gnanavelu, Saiprasanna. (2006). “Hyperbaric Laser Chemical Vapor Deposition of Carbon Fibers from the 1-Alkenes, 1-Alkynes, and Benzene”. Journal of the American Chemical Society v 128. pp. 4405-4413 }} 1 : Carbides |
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