Electron Microscopy of Ceramic Fiber-Ceramic Matrix Composites—Comparison with Processing and Behavior

2008 ◽  
pp. 513-529 ◽  
Author(s):  
B. A. Bender ◽  
D. Lewis ◽  
W. S. Coblenz ◽  
R. W. Rice
Keyword(s):  
Electron Microscopy ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Ceramic Fiber ◽  
Matrix Composites ◽  
And Behavior

Chemical and Morphological Analysis of Sol-derived Kca2Nb3O10

1999 ◽  
Vol 14 (4) ◽  
pp. 1325-1328 ◽  
Author(s):  
Steven T. Kim ◽  
Vinayak P. Dravid ◽  
Sankar Sambasivan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Morphological Analysis ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Morphological Properties ◽  
Layered Perovskite ◽  
Matrix Composites ◽  
Fiber Coating ◽  
Transmission Electron

The chemical and morphological properties of a sol-derived layered perovskite compound, Kca2Nb3O10 (KCN), are presented. Development of this compound is motivated by its use as an interphase fiber-coating material for ceramic matrix composites (CMC's). In such systems, this material is to be placed between the fiber and matrix to control crack propagation in the vicinity of the fiber, thereby enhancing toughness. Comparative analyses are performed between known bulk specimens of KCN and the sol-derived product using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The suitability of the sol-derived KCN for CMC applications is demonstrated through microstructure and chemical composition similar to that of the known bulk KCN samples.

Evaluation of Boron Nitride Coated Nextel 312TM Fiber/BlackglasTM Composites Using an Environmental SEM

1998 ◽  
Vol 4 (S2) ◽  
pp. 282-283
Author(s):  
Richard L. Schalek ◽  
John Helmuth ◽  
Lawrence T. Drzal
Keyword(s):  
Boron Nitride ◽  
Large Scale ◽  
Elevated Temperatures ◽  
Fiber Surface ◽  
Ceramic Matrix Composites ◽  
Cost Effective ◽  
Ceramic Matrix ◽  
Silicon Oxycarbide ◽  
Ceramic Fiber ◽  
Matrix Composites

The most critical technical issue preventing large scale application of ceramic matrix composites is the cost-effective application of stable interface coatings on continuous ceramic fibers. Currently, an alumina-silica ceramic fiber containing up to 14 wt. % boria (Nextel 312TM) is composited at elevated temperatures to form a boron nitride (BN) coating on the fiber surface. This BN coating serves as a compliant layer facilitating crack deflection and producing a non-catastrophic failure mode. Continued development of these ceramic matrix composites requires a more complete understanding of the mechanistic paths involved in composite densification. The objective of this work is to investigate and more clearly describe the role of the BN coating and its relation to composite processing and properties of the densified Nextel 312TM fiber/BlackglasTM (silicon oxycarbide) composites.Three composites consisting of as-received fibers (coated with an organic sizing), desized fibers (sizing removed by heating), and boron nitride coated fibers were fabricated using BlackglasTM preceramic polymer 489C B-stage resin.

The microstructure of SCS-6 SiC fiber

1991 ◽  
Vol 6 (10) ◽  
pp. 2234-2248 ◽  
Author(s):  
X.J. Ning ◽  
P. Pirouz
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Metal Matrix ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Sic Fiber ◽  
Carbon Core ◽  
Auger Microscopy ◽  
Electron Energy Loss

A thorough investigation of the microstructure of single SCS-6 SiC fibers widely used as reinforcements in metal-matrix and ceramic-matrix composites has been made. Various techniques of electron microscopy (EM) including scanning (SEM), conventional transmission (TEM), high resolution (HREM), parallel electron energy loss spectroscopy (PEELS), and scanning Auger microscopy (SAM) have been used to analyze and characterize the microstructure. The fiber is a complicated composite consisting of many different layers of SiC deposited on a carbon core and different carbonaceous coatings covering the SiC layers. The structural and chemical aspects of each layer are characterized and discussed.

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