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Mirowave Annealing Of Silicon Nitride Materials
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Book Synopsis Crystallization of Grain Boundary Phases in Silicon Nitride with Low Additive Contents by Microwave Annealing by :
Download or read book Crystallization of Grain Boundary Phases in Silicon Nitride with Low Additive Contents by Microwave Annealing written by and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microwave annealing of dense Si3N4-4% Y2O3 materials showed improvements over conventional heating. Increases in fracture toughness were observed for annealing between 1200--1650C. The high temperature strength was related to the residual [alpha]-Si3N4 content which is indicative of a finer average grain size in the specimens. The high temperature dynamic fatigue showed increased stress to failure for specimens microwave annealed between 1400--1550C for periods>5 h. Silicon nitrides with different sintering additives would require different conditions for optimum crystallization. While there were some observed property improvements, they were not so dramatic to justify abandoning conventional over microwave heating. The Si3N4-4% Y2O3 materials used in the study were developed for elevated temperature use and already posses excellent good high temperature strength, fatigue resistance and creep properties. This is due to the very refractory nature of the grain boundary phases and the small quantity of secondary phase present. However, microwave annealing of these materials may be necessary in applications where the maximum in fracture toughness and fatigue resistance are required and thus justifies its use.
Book Synopsis Mirowave Annealing of Silicon Nitride Materials by :
Download or read book Mirowave Annealing of Silicon Nitride Materials written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dense silicon nitride-based ceramics were microwave annealed to determine if microwave heating offers advantages over conventional heating for the enhancement of the high temperature creep resistance. Gas pressure sintered silicon nitride (GPS-SN) and sintered reaction-bonded silicon nitride (SRBSN) were heated in microwave or graphite element furnaces at 1150[degrees]C and 1600[degrees]C. Annealed materials were characterized for the room and high temperature flexural strengths, room temperature fracture toughness values, and high temperature creep properties. In addition, SEM analyses were performed to study grain growth and other microstructural changes. The results of this study showed that both types of furnace anneals at 1150[degrees]C lowered the room temperature strength and toughness values of both SRBSN and GPS-SN materials; however, the anneal treatments at 1600[degrees]C had little effect on the room temperature properties. Both the SRBSN and GPS-SN control and annealed samples had reduced high temperature fast fracture strengths, when compared to the room temperature strengths. Creep tests at 1200[degrees]C indicated that both the SRBSN and the GPS-SN materials that were annealed by microwave heating at I 150[degrees]C for 20 h showed enhanced creep resistance, when compared to unheated controls and conventionally heated materials. No qualitative differences were seen in the microstructures of the SRBSN and the GPS-SN materials which could account for the differences in the creep properties of the annealed materials. Additional experimental work is in progress to further understand the mechanisms for the enhanced creep properties of silicon nitride materials annealed by microwave heating.
Book Synopsis Development of Microwave Processing of Silicon Nitride Components for Advanced Heat Engine Applications -- Microwave Annealing of Silicon Nitride with High Additive Contents. CRADA Final Report for CRADA Number ORNL90-0035 by :
Download or read book Development of Microwave Processing of Silicon Nitride Components for Advanced Heat Engine Applications -- Microwave Annealing of Silicon Nitride with High Additive Contents. CRADA Final Report for CRADA Number ORNL90-0035 written by and published by . This book was released on 1994 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The initial work on microwave annealing of dense silicon nitride showed enhanced grain growth and improved creep resistance for materials annealed at temperatures of 1,200--1500 C. In those tests, the anneal times were on the order of 10--20 h to achieve the observed changes. To further study the effectiveness of microwave annealing, a Cooperative Research and Development Agreement (CRADA) was started in the area of microwave processing of silicon nitride with Garrett Ceramic Components/Allied-Signal (GCC/AS). The original plan was for ORNL to microwave anneal specimens of dense silicon nitride with high additive contents (> 5%) provided by GCC/AS at various times and temperatures. There were to be three sample types and 3--4 annealing conditions for a total of 9--12 annealing runs. The materials would then be characterized by both ORNL and GCC/AS to determine any changes in the properties. The objectives were: (1) to determine the effects of microwave crystallization on mechanical properties, and (2) to compare the effectiveness of microwave versus conventional heating. The mechanical properties examined that were fracture toughness, flexural strength and high temperature stress rupture. Delays, organizational changes, and other commercialization priorities resulted in a termination of this CRADA. This report contains a summary of results from one silicon nitride composition.
Book Synopsis Development of Microwave Processing of Silicon Nitride Components for Advanced Heat Engine Applications - Microwave Annealing of Silicon Nitride with High Additive Contents by :
Download or read book Development of Microwave Processing of Silicon Nitride Components for Advanced Heat Engine Applications - Microwave Annealing of Silicon Nitride with High Additive Contents written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstructure Development During Microwave Annealing of Dense Silicon Nitride by : T. N. Tiegs
Download or read book Microstructure Development During Microwave Annealing of Dense Silicon Nitride written by T. N. Tiegs and published by . This book was released on 1992 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microwave annealing of dense silicon nitride-based ceramics can result in substantial SiO volatilization from the grain boundary phases and compositional changes of those phases. It also results in further alpha-to-beta Si3N4 transformation accompanied by grain growth. These changes occur at bulk temperatures well below comparable observations in conventional heating. The differences are believed due to enhanced diffusion within the intergranular phases.
Book Synopsis Ultra-Fast Microwave Annealing of Silicon Carbide and Gallium Nitride by : V Rao Mulpuri
Download or read book Ultra-Fast Microwave Annealing of Silicon Carbide and Gallium Nitride written by V Rao Mulpuri and published by LAP Lambert Academic Publishing. This book was released on 2015-06-02 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel solid-state microwave annealing technique is developed for post-implantation annealing of silicon carbide (SiC) and Gallium Nitride (GaN), and for the controlled growth of SiC nanowires. This technique is capable of heating SiC samples to temperatures in excess of 2100 C, at ultra-fast temperature ramping rates > 600 C/s. For phosphorus and aluminum implanted SiC, sheet resistances as low as 14 /sq and 1.9 k /sq and majority carrier mobilities as high as 100 cm2/Vs and 8.3 cm2/Vs, respectively, are obtained. For the Al+ -implanted SiC, hole mobilties as high as 8.3 cm2/Vs is obtained. These values constitute the best ever reported electrical characteristics for high-dose ion-implanted SiC. Microwave annealing of in-situ as well as ion-implantation acceptor doped GaN was performed in the temperature range of 1200 C - 1600 C, for a duration of 5 s, using different protective caps (AlN, MgO, graphite). A patented, metal catalyst assisted sublimation sandwich method is invented for the growth of microwave-heating assisted cubic 3C-SiC nanowires."
Book Synopsis Energy Materials Coordinating Committe (EMaCC): Fiscal Year 1996 Annual Technical Report by :
Download or read book Energy Materials Coordinating Committe (EMaCC): Fiscal Year 1996 Annual Technical Report written by and published by DIANE Publishing. This book was released on with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microwave Processing of Materials by :
Download or read book Microwave Processing of Materials written by and published by . This book was released on 1996 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energy Materials Coordinating Committe (EMaCC): Fiscal Year 1997 Annual Technical Report by :
Download or read book Energy Materials Coordinating Committe (EMaCC): Fiscal Year 1997 Annual Technical Report written by and published by DIANE Publishing. This book was released on with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Silicon Nitride for Microelectronic Applications by : J. T. Milek
Download or read book Silicon Nitride for Microelectronic Applications written by J. T. Milek and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This survey is concerned with the use of silicon nitride in the semi conductor and microelectronics industries. The Handbook of Electronic Materials, volume 3, comprises part 1 of this survey and includes preparation and properties information. This report was prepared by Hughes Aircraft Company, Culver City, California under Contract Number F336lS-70-C-1348. The work was admini stered under the direction of the Air Force Materials Laboratory, Air Force Systems Command, Wright-Patterson Air Force Base, Ohio, with Hr. B. Emrich, Project Engineer. The Electronic Properties Information Center (EPIC) is a designated Information Analysis Center of the Department of Defense, authorized to pro vide information to the entire DoD community. The purpose of the Center is to provide a highly competent source of information and data on the electronic, optical and magnetic properties of materials of value to the Department of Defense. Its major function is to evaluate, compile and publish the experi mental data from the world's unclassified literature concerned with the properties of materials. All materials relevant to the field of electronics are within the scope of EPIC: insulators, semiconductors, metals, super conductors, ferrites, ferroelectrics, ferromagnetics, electroluminescents, thermionic emitters and optical materials. The Center's scope includes information on over 100 basic properties of materials; information generally regarded as being in the area of devices and/or circuitry is excluded. v CONTENTS Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Diffusion Mask Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . '" 11 Glass-to-Metal Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Passivation Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Memory Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Capacitors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Radiation Hardening Applications . . . . . . . . . . . . . . . •. . . . . . . . .
Book Synopsis 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B, Volume 21, Issue 4 by : Todd Jessen
Download or read book 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B, Volume 21, Issue 4 written by Todd Jessen and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 713 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.
Book Synopsis Review by : Oak Ridge National Laboratory
Download or read book Review written by Oak Ridge National Laboratory and published by . This book was released on 1990 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies on the Scale-up of the Microwave-assisted Nitridation and Sintering of Reaction-bonded Silicon Nitride by :
Download or read book Studies on the Scale-up of the Microwave-assisted Nitridation and Sintering of Reaction-bonded Silicon Nitride written by and published by . This book was released on 1996 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies using laboratory test samples have shown that microwave heating produces sintered reaction-bonded silicon nitride materials with improved properties. The final challenge for processing this material by microwave heating is the development of a technology for processing larger batch-size quantities of these materials. Initial microwave scale-up experiments were performed using powder compacts of a bucket tappet geometry. In experiments using microwave-transparent boron nitride sample crucibles, temperature gradients within some crucibles led to larger variations in the sample densities than were obtained with the conventionally processed samples. The use of a microwave-suscepter type crucible made of silicon carbide and boron nitride resulted in an improved temperature uniformity and in density variations comparable to those obtained for the control groups.
Book Synopsis Formation of Silicon Nitride by : Raymond C. Sangster
Download or read book Formation of Silicon Nitride written by Raymond C. Sangster and published by Trans Tech Publications Ltd. This book was released on 2005-06-01 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt: The elements: Si, N, O, C and H, have strong chemical affinities for one another. Under the correct conditions, Si-N bonding will occur in almost any Si-N-(O/C/H), and many related, reaction systems; although Si-O and Si-C are formidable competitors to Si-N. The most favored Si-N compound is stoichiometric Si3N4. It comes in three common varieties. How they interrelate, how one finds them and (above all ) how one makes them - and how sometimes they just happen to form - are the subjects of this book, with due attention being paid to closely related matters.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2, Volume 12, Issue 9/10 by : John B. Wachtman
Download or read book 15th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2, Volume 12, Issue 9/10 written by John B. Wachtman and published by John Wiley & Sons. This book was released on 2009-09-28 with total page 668 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.
Book Synopsis Silicon Nitride by : Emiliano Jose Hierra
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.
