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Microwave Nitridation Of Sintered Reaction Bonded Silicon Parts For Natural Gas Fueled Diesel Engines
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Book Synopsis Microwave Nitridation of Sintered Reaction Bonded Silicon Parts for Natural Gas Fueled Diesel Engines by :
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.
Book Synopsis Sintered Reaction Bonded Silicon Parts by Microwave Nitridation Combined with Gas-Pressure Sintering by :
Download or read book Sintered Reaction Bonded Silicon Parts by Microwave Nitridation Combined with Gas-Pressure Sintering written by and published by . This book was released on 1999 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cooperative project was a joint development program between Ceradyne and Oak Ridge National Laboratory through Lockheed Martin Energy Research (LMER). Cooperative work was of benefit to both parties. ORNL was able to assess the effect of the microwave nitridation process coupled with gas-pressure sintering for fabrication of parts for advanced diesel engines. Ceradyne gained access to gelcasting expertise and microwave facilities and experience for the nitridation of SRBSN materials. The broad objective of the CRADA between Ceradyne and OIWL was to (1) examine the applicability of the gelcasting technology to fabricate parts from SRBSN, and (2) to assess the effect of the microwave nitridation of silicon process coupled with gas-pressure sintering for fabrication of parts for advanced diesel engines. The following conclusions can be made from the work performed under the CRADA: (1) Gelcasting is a viable method to fabricate SRBSN parts using Ceradyne Si mixtures. However, the technique requires further development prior to being put into commercial use. (2) Microwave heating can be utilized to nitride multiple SRBSN parts. Scale-up of the process to fabricate several kilograms of material (up to 6 kg) per furnace run was demonstrated.
Book Synopsis Les Oiseaux du Golfe du Morbihan by : Rémy Basque
Download or read book Les Oiseaux du Golfe du Morbihan written by Rémy Basque and published by . This book was released on 1989 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment Publisher : ISBN 13 : Total Pages :1052 pages Book Rating :4.0/5 (9 download)
Book Synopsis The DOE FY 99 Budget Authorization Request ; H.R. 1806, to Provide for the Consolidation of the DOE Offices of Fossil Energy, Renewable Energy, and Energy Efficiency ; S. 965, to Amend Title II of the Hydrogen Future Act of 1996 by : United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment
Download or read book The DOE FY 99 Budget Authorization Request ; H.R. 1806, to Provide for the Consolidation of the DOE Offices of Fossil Energy, Renewable Energy, and Energy Efficiency ; S. 965, to Amend Title II of the Hydrogen Future Act of 1996 written by United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment and published by . This book was released on 2000 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment Publisher : ISBN 13 : Total Pages :888 pages Book Rating :4.0/5 (6 download)
Book Synopsis Fiscal Year 1998 Budget Authorization Request by : United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment
Download or read book Fiscal Year 1998 Budget Authorization Request written by United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment and published by . This book was released on 1999 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scale-up of the Nitridation and Sintering of Silicon Preforms Using Microwave Heating by :
Download or read book Scale-up of the Nitridation and Sintering of Silicon Preforms Using Microwave Heating written by and published by . This book was released on 1996 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scale-up studies were performed in which microwave heating was used to fabricate reaction-bonded silicon nitride and sintered reaction-bonded silicon nitride (SRBSN). Tests were performed in both a 2.45 GHz, 500 liter and a 2.45 GHz, 4,000 liter multimode cavities. A variety of sizes, shapes, and compositions of silicon preforms were processed in the studies, including bucket tappets and clevis pins for diesel engines. Up to 230 samples were processed in a single microwave furnace run. Data were collected which included weight gains for nitridation experiments, and final densities for nitridation and sintering experiments. For comparison, nitridation and sintering studies were performed using a conventional resistance-heated furnace.
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 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 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 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Gelcasting of Silicon Preforms for the Production of Sintered Reaction-bonded Silicon Nitride by :
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.
Book Synopsis Silicon Nitride and the Sialons by :
Download or read book Silicon Nitride and the Sialons written by and published by . This book was released on 1993 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicon nitride has been identified as one of the materials that could replace metals in engines and reduce dependence on strategic materials, while simultaneously enabling energy savings. This report analyzes various aspects of silicon nitride.
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 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Composition on the Processing and Properties of Sintered Reaction-bonded Silicon Nitride by :
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.
Book Synopsis Gelcasting of Silicon Compositions for SRBSN. by :
Download or read book Gelcasting of Silicon Compositions for SRBSN. written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compositions of high purity silicon metal containing various oxides as sintering aids were gelcast to prepare green bodies for subsequent nitridation and sintering to form sintered reaction bonded silicon nitride (SRBSN). An acidic aqueous and an alcohol-based gelcasting system were used. The solids content in the slurry affected the green density of the cast samples, however, there was no apparent correlation between the green density and the percent nitridation. Samples were nitrided under flowing, high-purity nitrogen in either a tungsten element furnace, a graphite element furnace, or in a microwave furnace. The samples nitrided in the graphite and microwave furnaces showed 9--16% higher levels of nitridation than in the tungsten furnace. A N2-4% H2 gas mixture was compared to pure nitrogen in the tungsten furnace. The addition of the hydrogen increased nitridation levels by 14--19%. The nitrided and sintered SRBSN ceramics had densities of 95--98% of theoretical, with no direct relationship being observed between the level of nitridation and the fired density. The average 4-point flexure strength of the samples ranged from 428 to 741 MPa.
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 1997 with total page 11 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°C and 1600°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°C lowered the room temperature strength and toughness values of both SRBSN and GPS-SN materials; however, the anneal treatments at 1600°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°C indicated that both the SRBSN and the GPS-SN materials that were annealed by microwave heating at I 150°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 Production of Dense Silicon Nitride Bodies by : B. Sonnenreich
Download or read book Production of Dense Silicon Nitride Bodies written by B. Sonnenreich and published by . This book was released on 1988 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
