Non-Oxide Technical and Engineering Ceramics

ISBN-13: 9789401080316 / Angielski / Miękka / 2011 / 458 str.

S. Hampshire

Opis

Conferences on technical and engineering ceramics are held with increasing frequency, having become fashionable because the potential of ceramics in profitable growth industries is an urgent matter of considerable debate and discussion. Japanese predictions are that the market value of ceramics will grow 10 at about 10% per annum to reach at least $10 by the end of the century. Seventy per cent of this market will be in electroceramics, applications for which include insulating substrates in integrated circuits, ferroelectric capacitors, piezoelectric oscillators and transdu cers, ferrite magnets, and ion-conducting solid electrolytes and sen sors. All these are oxides, and so are excluded by the title of the Limerick Conference. Why 'Non-oxide'? The other major ceramics potential is in struc tural engineering components and engine applications. Here, the greatest impetus to research and development has been the attempt to produce a ceramic gas turbine. Heat engines become more efficient as their working temperature increases, but nickel-base superalloy en gines have about reached their limit. Compared with metals, ceramics have higher strengths at high temperatures, better oxidation and corrosion resistance, and are also less dense. In general, ceramics have better properties above about 1000 C except in one respect-their inherent brittleness. The work of fracture is therefore much smaller than for metals and so the permitted flaw size is also smaller."

Spis treści

1. Sialons: A Study in Materials Development.- 2. Discussion Session: Aspects of Commercialisation of Advanced Ceramics and Future Opportunities.- 3. Analysis of Coarsening and Densification Kinetics During the Heat Treatment of Nitrogen Ceramics.- 4. Sinterability of Silicon Nitride Powders and Characterisation of Sintered Materials.- 5. Microstructural Development and Secondary Phases in Silicon Nitride Sintered with Mixed Neodymia/Magnesia Additions.- 6. Microstructural Development, Microstructural Characterization and Relation to Mechanical Properties of Dense Silicon Nitride.- 7. Sialon and Syalon Powders: Production, Properties and Applications.- 8. Reaction Sequences in the Preparation of Sialon Ceramics.- 9. Preparation and Densification of Nitrogen Ceramics from Oxides.- 10. Preparation of Sialon Ceramics from Low Cost Raw Materials.- 11. Densification Behaviour of Sialon Powders Derived from Aluminosilicate Minerals.- 12. Sintering and some Properties of Si3N4 Based Ceramics.- 13. Syalon Ceramic for Application at High Temperature and Stress.- 14. Structural Evolution Under High Pressure and at High Temperature of a ?’-Sialon Phase.- 15. Multianion Glasses.- 16. Non-destructive Evaluation of Ceramic Surfaces and Sub-surfaces.- 17. Preparation and Characterization of Yttrium ?’-Sialons.- 18. Characterisation and Properties of Sialon Materials.- 19. Comparison of CBN, Sialons and Tungsten Carbides in the Machining of Surgical Implant Alloys and Cast Irons.- 20. The Wear Behaviour of Sialon and Silicon Carbide Ceramics in Sliding Contact.- 21. Studies on Properties of Low Atomic Number Ceramics as Limiter Materials for Fusion Applications.- 22. Effect of Microstructural Features on the Mechanical Properties of REFEL Self-bonded Silicon Carbide.- 23. Failure Probability of Shouldered and Notched Ceramic Components Using Neuber Notch Theory.- 24. Characterisation and Mechanical Properties of Hot-pressed and Reaction-bonded Silicon Nitride.- 25. Tensile Strength of a Sintered Silicon Nitride.- 26. Selecting Ceramics for High Temperature Components in IC Engines.- 27. Oxidative Removal of Organic Binders from Injection-molded Ceramics.- 28. Silicon Nitride Ceramics and Composites: a View of Reliability Enhancement.- 29. Panel Discussion: Aspects of Reliability.- List of Participants.- Index of Contributors.