scholarly journals Support services for ceramic fiber-ceramic matrix composites. Annual technical progress report

1998 ◽  
Author(s):  
J.P. Hurley ◽  
V. Kuehnel
Keyword(s):  
Technical Progress ◽  
Support Services ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Progress Report ◽  
Ceramic Fiber ◽  
Matrix Composites

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.

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