Advanced fibers for high-temperature ceramic composites : advanced materials for the twenty-first century / Committee on Advanced Fibers for High-Temperature Ceramic Composites, National Materials Advisory Board, Commission on Engineering and Technical Systems, National Research Council.

Format:

Book

Author/Creator:

National Research Council (U.S.). National Materials Advisory Board. Committee on Advanced Fibers for High-Temperature Ceramic Composites.

Series:

Compass series (Washington, D.C.)

Publication NMAB ; 494.

Publication NMAB ; 494

Compass series

Language:

English

Subjects (All):

Ceramic-matrix composites.

Ceramic fibers.

Heat resistant materials.

Physical Description:

1 online resource (111 p.)

Edition:

1st ed.

Place of Publication:

Washington, DC : National Academy Press, 1998.

Language Note:

English

Summary:

High-temperature ceramic fibers are the key components of ceramic matrix composites (CMCs). Ceramic fiber properties (strength, temperature and creep resistance, for example)-along with the debonding characteristics of their coatings-determine the properties of CMCs. This report outlines the state of the art in high-temperature ceramic fibers and coatings, assesses fibers and coatings in terms of future needs, and recommends promising avenues of research. CMCs are also discussed in this report to provide a context for discussing high-temperature ceramic fibers and coatings.

Contents:

CERAMIC FIBERS AND COATINGS

Copyright

Preface

Acknowledgments

Contents

Acronyms

Executive Summary

APPROACH

HIGH-TEMPERATURE CERAMIC FIBERS

Non-Oxide Ceramic Fibers

Oxide Ceramic Fibers

FIBER COATINGS

Coatings for Non-Oxide Fibers

Coatings for Oxide Fibers

RECOMMENDATIONS AND IMPACTS

DISCUSSION OF PRIORITIES

1 Introduction

POTENTIAL CERAMIC MATRIX COMPOSITE APPLICATIONS

COMPOSITE MATERIALS

CERAMIC FIBERS AND COATINGS

ENGINEERING REQUIREMENTS

REPORT ORGANIZATION

2 Current and Future Needs

IMPLEMENTATION OF NEW MATERIALS

Glass Matrix Composites

SiC Matrix Composites

Oxide/Oxide Composites

Inhibited Carbon Matrix Composites

CERAMIC MATRIX COMPOSITE DESIGN AND LIFE PREDICTIONS

CERAMIC MATRIX COMPOSITE APPLICATIONS AND REQUIREMENTS

Energy Systems

Aerospace Systems

MANUFACTURING REQUIREMENTS

Reliability and Reproducibility of Fiber Supplies

Handleability and Processability

IMPLICATIONS FOR FIBER PROPERTIES

General Considerations

Fiber and Interface Requirements

3 State of the Art in Ceramic Fiber Performance

CANDIDATE FIBERS

Comparison of Fiber Categories

TEMPERATURE AND TIME DEPENDENCE OFPROPERTIES OF NON-OXIDE FIBERS

Strength and Stiffness as a Function of Test Temperature

Room-Temperature Strength and Modulus as a Function of Aging

Thermal Conductivity (Diffusivity) and Electrical Conductivity (Resistivity) as a Function of Temperature and Aging History

Creep Behavior of Non-Oxide Fibers and Effects of Heat Treatment, Oxidation, and Aging

Rupture Behavior of Non-Oxide Fibers in Oxidizing and Non-Oxidizing Environments and the Effects of Heat Treatment and…

Microstructural Stability

TEMPERATURE AND TIME DEPENDENCE OF PROPERTIES OF OXIDE FIBERS.

Strength and Stiffness as a Function of Test Temperature

Room-Temperature Strength and Modulus as a Function of Aging History

Thermal Conductivity (Diffusivity) and Electrical Conductivity (Resistivity) as a Function of Test Temperature and Aging…

Creep Behavior of Oxide Fibers

PERFORMANCE CHARACTERISTICS COMPARED TO PERFORMANCE GOALS

RECOMMENDATIONS AND FUTURE DIRECTIONS

4 Ceramic Fiber Processing

NON-OXIDE FIBER PROCESSING

Preceramic Polymer Processing

Microstructural Development

OXIDE FIBER PROCESSING

Chemical Processing

Chemistry of Oxide Fiber Precursors

Basic Aluminum Salts

Polymeric Aluminoxane

Dry Spinning

Pyrolysis

Heat Treatment and Fiber Microstructure

Non-Oxide Fibers

Oxide Fibers

5 Materials and Microstructures

OPPORTUNITIES FOR FIBER DEVELOPMENT

POLYCRYSTALLINE OXIDES

POLYCRYSTALLINE SILICON CARBIDE

AMORPHOUS FIBERS

6 Interfacial Coatings

COATINGS FOR NON-OXIDE COMPOSITES

Carbon Coatings

Composite Behavior

Oxidation Behavior

Boron Nitride Coatings

Alternative Fiber Coatings

Coating Compositions

Systems Approach to Inhibiting Oxidative Embrittlement

Coating Processes and Vendors

Chemical Vapor Deposition

Vendors

Alternative Approaches

OXIDE FIBER COATINGS

Porous Coatings and Porous Matrix Approaches

Porous Coatings

No Coating/Porous Matrix Approach

Fugitive and Segregant Weakened Interfaces

Fugitive Interfaces

Segregant Weakened Interfaces

Dense Oxide Fiber Coatings

Nonreactive Oxides

Layered Oxides

Weakly Bonded, Nonlayered Oxides

Immiscible Liquid Coating Technique.

Heterocoagulation Technique

Non-Oxide Fiber Coatings

Oxide Fiber Coatings

7 Cost Issues

PRICE VS. COST

TYPES OF COST

Variable Costs

Fixed Costs

The Bridging Factor-Cycle Time

GENERAL FIBER MANUFACTURING COSTS

MANUFACTURING CERAMIC FIBERS

OXIDES VS. NON-OXIDES

FINDINGS

Relationship between Price and Volume

Is Fiber Price Really the Key Issue?

Improving Performance vs. Lowering Prices

System Costs

Implementation Costs

CONCLUSIONS

Improving Fiber Performance

Reducing the Risk of Commercializing Ceramic Fibers

Expanding the Potential Market

8 Recommendations and Future Directions

ENGINEERING DATA

DEVELOPMENT OF OXIDE FIBERS

DEVELOPMENT OF NON-OXIDE FIBERS

MANUFACTURING COSTS

PRIORITIES

References

Biographical Sketches of Committee Members.

Notes:

Bibliographic Level Mode of Issuance: Monograph

Includes bibliographical references (p. 87-92).

ISBN:

9786610186839

9780309174176

0309174171

9781280186837

1280186836

9780309569033

0309569036

OCLC:

666925462