Ceramic oxides fibers

Various ceramic oxides are used for making ceramic fibers, among them pure alumina fibers and alumina-silica fibers are the most common. The former were commercialized by ICl Ltd. under the trade name SaffW extensively used in high temperature insulation to replace asbestos and glass fiber felts that pose occupational safety issues, while alumina-silica fibers were commercialized by 3M under the trade name Nextel . Various processing routes can be used to manufacture ceramic oxide fibers, the most common being  

Continuous alumina fibers are available from several suppliers. Chemical compositions and properties of the various fibers are significantly different. 

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FIGURE 1-7 Tow of 3M Nextel 610 polycrystalline ceramic oxide fibers. Polycrystalline oxide fibers are... 

FIGURE 4-3 Flow chart of chemical processing of ceramic oxide fibers. Souree 3M Company... 

The development of coatings for ceramic oxide fibers has lagged behind the development of coatings for non-oxide fibers partly because of the insufficient creep resistance of... 

Figure 7-2 shows that the Nextel ceramic oxide fibers are currently available within the price range of commercially available carbon fibers. That is, they cost more than low modulus carbon fibers but less than high modulus carbon fibers. There are even specialty grades of carbon fiber that sell for much more than the carbon fiber prices shown in Figure 7-2. Thus, by current standards, the Nextel family of ceramic fibers cannot truly be labeled expensive.

T.L. Tomkins, Ceramic Oxide Fibers Building Blocks for New Applications, Ceramiclndustry, April (1995). 

CERAMIC OXIDE FIBERS FROM SOL-GELS AND 11 SILICON NITRIDE AND BORIDE BASED FIBERS... 

Continuous ceramic oxide fibers have low melt viscosities and very high crystallization propensities, and therefore cannot be readily obtained directly from a melt. Solid green or precursor fibers are obtained from solutions or dispersions, respectively, and they are converted into ceramic oxide fibers (Table I). In contrast, continuous silica glass fibers can be dry spun directly from a high viscosity melt or indirectly from a viscous sol-gel (Chapter 5). 

Applications of ceramic oxide fibers are discussed in Chapter 12, along with related applications of carbon and silicon carbide fibers. 

The physical and mechanical properties of zirconia based fibers are not sufficiently known, Inasmuch as high performance continuous fibers are not available from the market and experimental materials are scarce. The applications for ceramic oxide fibers are discussed in Chapter 12, along with related applications of carbon and silicon carbide fibers. 

T. L. Tompkins, Ceramic oxide fibers, building blocks for new applications. Ceramic Industry, 144 [4], 45-50... 

Wilson, D.M. and Visser, L.R. (2000) Nexie 650 ceramic oxide fiber new alumina-based fiber for high temperature composite reinforcement. Ceram. Eng. Sci. Proc., 21(3) 363. 

Several ceramic oxide fibers with diameters between 200 and 400 nm were obtained by calcination at high temperatures of a hybrid (inorganic and polymeric materials) obtained by electrospinning [32-35], In these studies, it was observed that the calcination tanperature has great influence on the crystallinity of the phases and morphology of the fibers obtained. 

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