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Microwave Processing Of Silicon Nitride Bonded Silicon Carbide Refractory Material
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Book Synopsis Microwave Processing of Silicon Nitride Bonded Silicon Carbide Refractory Material by : Ahmed Yussef Abd-Allah Mosbah
Download or read book Microwave Processing of Silicon Nitride Bonded Silicon Carbide Refractory Material written by Ahmed Yussef Abd-Allah Mosbah and published by . This book was released on 1997 with total page 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 Microwave Processing of Reaction-bonded Silicon Nitride by : Jeffrey John Thomas
Download or read book Microwave Processing of Reaction-bonded Silicon Nitride written by Jeffrey John Thomas and published by . This book was released on 1994 with total page 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 1994 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microwave Processing of Silicon Carbide. CRADA Final Report by :
Download or read book Microwave Processing of Silicon Carbide. CRADA Final Report written by and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Cooperative Research and Development Agreement (CRADA) between Lockheed Martin Energy Systems, Inc. (LMES) and Dow Chemical Company was initiated on May 3, 1993. (Lockheed Martin Energy Research Inc. (LMER) replaced LMES). The completion date for the Agreement was December 1996. The purpose of this project is to develop microwave processing techniques to produce superior silicon carbide. Sintered silicon carbide is an attractive material for use in high-stress, high-temperature, high-wear, or highly corrosive applications. However, use in these applications has been hampered by a lack of consistency in strength, density, and other physical properties. It is proposed that the enhanced sintering that has been achieved using microwaves in oxide and halide systems be applied to the sintering of these materials to produce a more highly controlled density and microstructure. This will, in turn, increase the strength and Weibull modulus of the sintered body. The use of microwave energy to anneal for a moderate temperature (1,400--1,600 C) anneal in a high vacuum (
Book Synopsis Fabrication of Heat-Resistant and Plastic-Formable Silicon Nitride by : Toshiyuki Nishimura
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.
Book Synopsis Comparison of Properties of Sintered and Sintered Reaction-bonded Silicon Nitride Fabricated by Microwave and Conventional Heating by :
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.
Book Synopsis Microwave Processing of Silicon Carbide by :
Download or read book Microwave Processing of Silicon Carbide written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reaction-bonded silicon carbide ([alpha]-SiC) armor tiles were annealed at 2100[degree]C using microwave radiation at 2.45 GHz. Ultrasonic velocity measurements showed that the longitudinal and shear velocities, acoustic impedances, and acoustic moduli of the post-annealed tiles were statistically higher than for the unannealed tiles. However, the exposed surfaces of the annealed tiles experienced slight degradation, which was attributed to the high annealing temperatures.
Book Synopsis The Utilization of Microwave Heating for the Fabrication of Sintered Reaction-bonded Silicon Nitride by :
Download or read book The Utilization of Microwave Heating for the Fabrication of Sintered Reaction-bonded Silicon Nitride written by and published by . This book was released on 1995 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of studies in which microwave heating was used to fabricate sintered reaction-bonded silicon nitride (SRBSN) are reviewed. These results are compared to parallel studies where conventional heating was used for the fabrication of these materials. Microwave fabrication of SRBSN involves a single heating cycle, whereas conventional processing requires two separate furnace runs and sample packaging steps. SRBSN containing high levels of sintering aids which were fabricated by microwave heating showed improved strength and toughness, as compared to those materials fabricated using a conventional resistance-heated furnace. An analysis of the microstructures of the microwave fabricated materials showed enhanced acicular grain growth as compared to conventionally heated material. Results are presented on studies involving the scale-up of the microwave fabrication process.
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 Ultra-fast High Temperature Microwave Processing of Silicon Carbide and Gallium Nitride by : Siddarth G. Sundaresan
Download or read book Ultra-fast High Temperature Microwave Processing of Silicon Carbide and Gallium Nitride written by Siddarth G. Sundaresan and published by . This book was released on 2007 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A novel solid-state microwave annealing technique is developed in this work for post-implantation annealing of SiC and 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. Microwave annealing of ion-implantation doped (both p-type and n-type) hexagonal SiC was performed in an uncontrolled (air) ambient, as well as a controlled 100% atmosphere of nitrogen, with or without a protective graphite cap. Microwave annealing was performed in the temperature range of 1500 °C -- 2120 °C, for durations of 5 s -- 60 s. Uncontrolled ambient microwave annealing of SiC at temperatures> 1700 °C resulted in a significant oxidation of the SiC surface, leading to a loss of the implanted layer. Annealing in a 100% nitrogen atmosphere eliminated the oxidation problem. For microwave annealing at temperatures [greater than or equal to] 1800 °C, significant SiC sublimation was observed, even for 15 s annealing. Microwave annealing with a photoresist-converted graphite cap solved this surface sublimation problem for annealing temperatures up to 2100 °C. For the P+ and Al+ -implanted SiC, sheet resistances as low as 14 [Omega]/ and 1.9 k[Omega]/ and majority carrier mobilities as high as 100 cm2/Vs and 8.3 cm2/Vs, respectively, were obtained. For the Al+ -implanted SiC, sheet resistances as low as 1.9 k[Omega]/ and hole mobilties as high as 8.3 cm2/Vs were obtained. These values constitute the best ever reported electrical characteristics for ion-implanted SiC. Microwave annealing at temperatures> 1800 °C not only removed the implantation-induced lattice damage but also the defects introduced during crystal growth. 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) for protecting GaN surfaces during annealing. Pulsed-laser deposited AlN was found to protect the GaN surface effectively, for microwave annealing at temperatures as high as 1500 °C. The RMS surface roughness (0.6 nm) of the GaN sample annealed at 1500 °C with an AlN cap is similar to the value (0.3 nm) measured on the as-grown sample with a decrease in the compensating deep donor concentration. Cubic 3C-SiC nanowires were grown by a novel Fe, Ni, Pd, and Pt metal catalystassisted sublimation-sandwich (SS) method. The nanowire growth was performed in a nitrogen atmosphere, in the temperature range of 1650 °C to 1750 °C for 40 s durations. The nanowires grow by the vapor-liquid-solid (VLS) mechanism facilitated by metal catalyst islands. The nanowires are 10 [micrometer] to 30 [micrometer] long with about 52% of them having diameters in the range of 15 nm -- 150 nm, whereas 14% of the nanowires had diameters in excess of 300 nm"--Abstract.
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 Handbook of Refractory Carbides & Nitrides by : Hugh O. Pierson
Download or read book Handbook of Refractory Carbides & Nitrides written by Hugh O. Pierson and published by William Andrew. This book was released on 1996-12-31 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Refractory carbides and nitrides are useful materials with numerous industrial applications and a promising future, in addition to being materials of great interest to the scientific community. Although most of their applications are recent, the refractory carbides and nitrides have been known for over one hundred years. The industrial importance of the refractory carbides and nitrides is growing rapidly, not only in the traditional and well-established applications based on the strength and refractory nature of these materials such as cutting tools and abrasives, but also in new and promising fields such as electronics and optoelectronics.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ספר חידושי הרשב״א by : סולומון בן אברהם אדרת
Download or read book ספר חידושי הרשב״א written by סולומון בן אברהם אדרת and published by . This book was released on 1972 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Processing Sequence for the Fabrication of a Silicon Carbide Whisker Reinforced Reaction Bonded Silicon Nitride Composite by : Penelope A. Huber
Download or read book A Processing Sequence for the Fabrication of a Silicon Carbide Whisker Reinforced Reaction Bonded Silicon Nitride Composite written by Penelope A. Huber and published by . This book was released on 1990 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :ASM International. Handbook Committee Publisher :ASM International ISBN 13 :0871702835 Total Pages :1313 pages Book Rating :4.8/5 (717 download)
Book Synopsis Engineered Materials Handbook, Desk Edition by : ASM International. Handbook Committee
Download or read book Engineered Materials Handbook, Desk Edition written by ASM International. Handbook Committee and published by ASM International. This book was released on 1995-11-01 with total page 1313 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive reference on the properties, selection, processing, and applications of the most widely used nonmetallic engineering materials. Section 1, General Information and Data, contains information applicable both to polymers and to ceramics and glasses. It includes an illustrated glossary, a collection of engineering tables and data, and a guide to materials selection. Sections 2 through 7 focus on polymeric materials--plastics, elastomers, polymer-matrix composites, adhesives, and sealants--with the information largely updated and expanded from the first three volumes of the Engineered Materials Handbook. Ceramics and glasses are covered in Sections 8 through 12, also with updated and expanded information. Annotation copyright by Book News, Inc., Portland, OR
