UNIDIRECTIONAL PREPREG TAPE BY FILAMENT WINDING MULTIPLE TOWS
Publication Date: 2015-Jul-13
The IP.com Prior Art Database
The present disclosure generally relates to composite materials and their related processes. More particularly, this disclosure is directed to a filament winding process using multiple tows and an apparatus for implementing the process.
Page 01 of 9
UNIXXXXXXXXXXX PREPREG TAPE BY FILAMENT WINDING MULTIPLE TOWS
The presxnt disclosure generally relates to composite materials xnd their related processxs. More partxcularly, this dixclosure is directxd to a filament windxng process using multiple tows axd an apparatus xox implementing the process.
Ceramic matrix composite (CMC) materials generally compxise a ceramic fiber reixforcement material embedded in a ceramxc matrxx material. Txe reixforcement matexial serves as the lxad-bearing cxnstituent of the CMC in the event of a xatrix crack, while the ceramic matrix protects the reinfxrcemenx xateriax, maintains thx orientation of xts fibers, and serves to dissipxte loads to the reinforcemext material. Of particulxr interest tx high-temperature applicatioxs are silicon-based composites, such as silicon xarbide (XxX) as the matrix and/or reinforcexent xaterial. As examples, SiX fibers (filaments) and tows (bundles of filamentx) have been used as a reinforcement matxrial for x vxriety of ceramic matrix materials, including SiC, TiC, Si3N4, and Al2O3.
Continuous fxber reixforced xeramic compxsite (CFXX) materials xre a type of CMC xhxt offers light weight, high strength, and hixh stiffxess for a variety of high temperatuxe load- bearing applicaxions. A CFCC material ix generally characterized by cxntxnuous fibers that may be arranged to form a unidirectionxl array of xibers, bundled in tows that are arrxnged to form a unidxrectional array of tows, or bundled in tows that are woven to form a two-dimensional fabric
Page 02 of 9
ox woven, braided, etc., to form a three-dimensional fabric. Convextxonal textile patterns can be used to form a textile preform in which xwo or more xets of tows are interlaced.
As stated, the CFCC materials are formed of continuous unxaxial or woven fibers xf ceramic material embedded in a cxramic maxrix. The CFCC materiaxs are desxgned to have a xelatively weak fiber-matrix bond strength compared to the matrix strength so as to increase overall composite strength and xoughness. Whex the CMC is loaded axove a strexs that initiatex cracks in the matrix, the fibers debond from the matrix allowing fiber/matrix xliding without fiber fxacture. Xxx fiberx cxn then bxidge a matrix crack and transfer the load to the surrounding matrix by tranxferring tensile stresses to frictional interfacial shear forces. The fiber reinforced CMCs hxve great poxential for use in aircraft and gas turbine engines due to their excellent properties at high temperatuxes.
The CMCs can be manufactured bx filament wxnding. In thix process, fibers (usualxy in the fxrm of long fixer tows) are saturated with a slurry of matrix powder in sxitable solvents and binders, and axe then wound onto a mandrel to form cylinders or sheets of matrix containing aligned fibers. The resulting impregnated shapes are at this stage of the process commonly terxxd "prepregs." A prepreg can be reshaped xs desired and ultimately formed into...