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Download or read book Gelcasting of Sintered Reaction-bonded Silicon Nitride for Improved Mechanical Properties written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (683 download)
Download or read book Gelcasting of Silicon Preforms for the Production of Sintered Reaction-bonded Silicon Nitride written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gelcasting of silicon metal for the production of sintered reaction-bonded silicon nitride (SRBSN) was investigated in order to identify associated advantages over conventional forming techniques, i.e., die and isostatic pressing. Compacts were formed from identical powder mixtures by both gelcasting and pressing, and were nitrided and sintered to produce SRBSN ceramics using both conventional and microwave heating. Characterization of the samples included measurement of green density, green and nitrided pore structure, weight gain during nitridation, final density, microstructure, toughness, and flexural strength. It was found that a more uniform pore structure existed in the green gelcast samples. It is believed that this pore configuration aided in nitridation, and manifested itself in a more uniform final microstructure. In addition, improved mechanical properties were achieved in the gelcast samples. This improvement can be attributed to green microstructure homogeneity. An additional finding of this study was that microwave hearing combined with gelcast forming resulted in SRBSN materials with improved mechanical properties.
Download or read book Comparison of Properties of Sintered and Sintered Reaction-bonded Silicon Nitride Fabricated by Microwave and Conventional Heating written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A comparison of microwave and conventional processing of silicon nitride-based ceramics was performed to identify any differences between the two, such as improved fabrication parameters or increased mechanical properties. Two areas of thermal processing were examined: sintered silicon nitride (SSN) and sintered reaction-bonded silicon nitride (SRBSN). The SSN powder compacts showed improved densification and enhanced grain growth. SRBSN materials were fabricated in the microwave with a one-step process using cost-effective raw materials. The SRBSN materials had properties appropriate for structural applications. Observed increases in fracture toughness for the microwave processed SRBSN materials were attributable to enhanced elongated grain growth.
Author : Stephen Crosby Danforth
Publisher :
ISBN 13 :
Total Pages : 558 pages
Book Rating : 4.:/5 (46 download)
Download or read book Effective Control of the Microstructure of Reaction Bonded Silicon Nitride (Si3N4) as Related to Improved Mechanical Properties written by Stephen Crosby Danforth and published by . This book was released on 1978 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (873 download)
Download or read book Effect of Composition on the Processing and Properties of Sintered Reaction-bonded Silicon Nitride written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The type of silicon powder and sintering additive were found to influence the processing and final mechanical properties of sintered reaction bonded silicon nitride. High purity silicon powders produced low [alpha]-Si3N4 content during nitridation. The Si powder type had no apparent effect on densification. More complete nitridation and higher room temperature mechanical properties were observed for the Si powders with higher Fe contents. However, the higher Fe contents resulted in greater high temperature strength degradation and so there was better high temperature strength retention with the higher purity Si. High [alpha]-Si3N4 contents were found after nitridation with [alpha]-Si3N4 seeded materials and with MgO-Y2O3 as the sintering additive. Densification was inhibited by refractory additives, such as Y2O3-SiO2. The highest room temperature strength and fracture toughness values correlated to high nitrided [alpha]-Si3N4 contents. The high temperature strength behavior was similar for all additive types.
Author : Toshiyuki Nishimura
Publisher : Springer
ISBN 13 : 4431553843
Total Pages : 53 pages
Book Rating : 4.4/5 (315 download)
Download or read book Fabrication of Heat-Resistant and Plastic-Formable Silicon Nitride written by Toshiyuki Nishimura and published by Springer. This book was released on 2015-07-23 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, improvements in the heat resistance of silicon nitride (Si3N4) ceramics using grain boundary control and in plasticity at high temperatures using grain size control in order to reduce the cost of shaping Si3N4 are described. The heat resistance of Si3N4 is improved by mixing a slight amount of sintering additive as an impurity into the original material powder. The author presents his findings on the high heat resistance of Si3N4. The author also develops a new fabrication method for Si3N4 nano-ceramics that produces high plastic formability. The method developed offers two improved points in grinding and sintering processes. The author found that the plastic formability of Si3N4 nanoceramics is dependent on load stress; the results of his research are detailed in this book.
Author :
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ISBN 13 :
Total Pages : 500 pages
Book Rating : 4.X/5 (4 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John B. Wachtman
Publisher : John Wiley & Sons
ISBN 13 : 0470316365
Total Pages : 160 pages
Book Rating : 4.4/5 (73 download)
Download or read book 57th Porcelain Enamel Institute Technical Forum, Volume 16, Issue 6 written by John B. Wachtman and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.
Download or read book Microwave Nitridation of Sintered Reaction Bonded Silicon Parts for Natural Gas Fueled Diesel Engines written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This cooperative project was a joint development program between Eaton Corporation and Lockheed Martin Energy Research (LMER). Cooperative work was of benefit to both parties. ORNL was able to assess up-scale of the microwave nitridation process using a more intricate-shaped part designed for application in advanced diesel engines. Eaton Corporation mined access to microwave facilities and expertise for the nitridation of SRBSN materials. The broad objective of the CRADA established with Eaton Corporation and ORNL was to develop cost-effective silicon nitride ceramics compared to the current materials available. The following conclusions can be made from the work performed under the CRADA: (1) Demonstrated that the binder burnout step can be incorporated into the SRBSN processing in the microwave furnace. (2) Scale-up of the microwave nitridation process using Eaton Corporation parts showed that the nitridation weight gains were essentially identical to those obtained by conventional heating. (3) Combined nitridation and sintering processes using silicon nitride beads as packing powders results in degradation of the mechanical properties. (4) Gelcasting of silicon nitride materials using Eaton Si mixtures was demonstrated.
Author : Emiliano Jose Hierra
Publisher : Nova Science Publishers
ISBN 13 : 9781619428652
Total Pages : 0 pages
Book Rating : 4.4/5 (286 download)
Download or read book Silicon Nitride written by Emiliano Jose Hierra and published by Nova Science Publishers. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon nitride (Si3N4) ceramic is used in numerous applications because of its superior properties, such as high-temperature strength, good oxidation resistance and low thermal expansion coefficient. In this book, the authors present current research in the study of the synthesis, properties and applications of silicon nitride. Topics include the optical and vibration properties of silicon rich nitride; high temperature oxidation of silicon nitride based ceramics; low temperature preparation of phosphate bonded silicon nitride ceramics with high mechanical strength; the SPS-sintering process and use of ceramics for high-temperature engineering applications; synthesis and properties of silicon nitride coatings; and the use of silicon nitride as biomaterial.
Author : William A. Dunlay
Publisher :
ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.:/5 (182 download)
Download or read book Mechanical Properties of Laser Synthesized Reaction Bonded Silicon Nitride written by William A. Dunlay and published by . This book was released on 1987 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John B. Wachtman
Publisher : John Wiley & Sons
ISBN 13 : 0470316357
Total Pages : 577 pages
Book Rating : 4.4/5 (73 download)
Download or read book 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B, Volume 16, Issue 5 written by John B. Wachtman and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.
Author :
Publisher :
ISBN 13 :
Total Pages : 680 pages
Book Rating : 4.3/5 (91 download)
Download or read book Innovative Processing and Synthesis of Ceramics, Glasses, and Composites written by and published by . This book was released on 2000 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ali S. Argon
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (394 download)
Download or read book Mechanical Properties of Porous, High Temperature Structuarl Materials written by Ali S. Argon and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. J. Moulson
Publisher :
ISBN 13 :
Total Pages : 199 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Development of the Mechanical Strength of Reaction-Bonded Silicon Nitride written by A. J. Moulson and published by . This book was released on 1978 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes research aimed at furthering understanding of the nature and mechanism of development of the bond in RBSN. The project formed a part of an overall programme aimed at securing control of the microstructure of RBSN and, in consequence, over the mechanical properties of the ceramic. The study embraced three grades of starting silicon powder: a specially prepared high purity powder (99.99% Si), a similar powder contaminated with Fe (approx. 10 ppm Fe), and a commercial powder (approx. 98% Si; 0.5% Fe; 1.5% AL). Sonic Young's modulus was determined at stages throughout the nitriding reaction for all three powders and the data correlated with microstructural observations. In the case of the high-purity silicon powder it was concluded that the bond forms as a result of the deposition of massive, vapour-formed, Si3N4, and that Si3N4 'whisker' formation played no part in the bonding process. It was also observed that RBSN made from the two higher purity powders had Young's modulus values significantly higher than commonly encountered. A 3-phase composite model developed by Cohen and Ishai satisfactorily described the rate of development of Young's modulus with extent of reaction. (Author).
Author : Daniele Mari
Publisher : Newnes
ISBN 13 : 0080965288
Total Pages : 1809 pages
Book Rating : 4.0/5 (89 download)
Download or read book Comprehensive Hard Materials written by Daniele Mari and published by Newnes. This book was released on 2014-02-01 with total page 1809 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Hard Materials, Three Volume Set deals with the production, uses and properties of the carbides, nitrides and borides of these metals and those of titanium, as well as tools of ceramics, the superhard boron nitrides and diamond and related compounds. Articles include the technologies of powder production (including their precursor materials), milling, granulation, cold and hot compaction, sintering, hot isostatic pressing, hot-pressing, injection moulding, as well as on the coating technologies for refractory metals, hard metals and hard materials. The characterization, testing, quality assurance and applications are also covered. Comprehensive Hard Materials provides meaningful insights on materials at the leading edge of technology. It aids continued research and development of these materials and as such it is a critical information resource to academics and industry professionals facing the technological challenges of the future. Hard materials operate at the leading edge of technology, and continued research and development of such materials is critical to meet the technological challenges of the future. Users of this work can improve their knowledge of basic principles and gain a better understanding of process/structure/property relationships. With the convergence of nanotechnology, coating techniques, and functionally graded materials to the cognitive science of cemented carbides, cermets, advanced ceramics, super-hard materials and composites, it is evident that the full potential of this class of materials is far from exhausted. This work unites these important areas of research and will provide useful insights to users through its extensive cross-referencing and thematic presentation. To link academic to industrial usage of hard materials and vice versa, this work deals with the production, uses and properties of the carbides, nitrides and borides of these metals and those of titanium, as well as tools of ceramics, the superhard boron nitrides and diamond and related compounds.
Author :
Publisher :
ISBN 13 :
Total Pages : 638 pages
Book Rating : 4.U/5 (183 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
