Modeling the Flow of Molten Silicon in Porous Carbon Preforms and the Subsequent Formation of Silicon Carbide

1994 ◽  
Vol 365 ◽  
Author(s):  
G. Rajesh ◽  
Ram B. Bhagat ◽  
Emily Nelson
Keyword(s):  
Silicon Carbide ◽  
High Performance ◽  
Space Shuttle ◽  
Low Cost ◽  
Fuel Efficiency ◽  
Ceramic Matrix Composites ◽  
Aircraft Engine ◽  
Molten Silicon ◽  
Subsequent Formation ◽  
Silicon Based

Ceramic matrix composites (CMCs) are being considered for a broad range of aerospace applications that include various structural components for the aircraft engine and the space shuttle main engine. Use of silicon-based CMCs which have high thermal conductivity, allows for improvements in fuel efficiency due to increased engine temperatures and pressures, which in turn generate more power and thrust. Furthermore, CMCs offer significant potential for raising the thrust-to-weight of gas turbine engines by tailoring directions of high specific reliability using design-based fiber architecture. One of the low-cost processing techniques for the silicon-based CMCs is the reactive melt infiltration [1] of silicon into the preform of carbon-coated silicon carbide fiber. However, fabrication of high performance SiC/SiC composites requires a deeper understanding of the infiltration kinetics such that fibers are protected from adverse reaction with the molten metal, that the preform is thoroughly infiltrated, and that there is no residual silicon left unreacted.

Designing of hierarchical mesoporous/macroporous silicon-based composite anode material for low-cost high-performance lithium-ion batteries

2019 ◽  
Vol 7 (8) ◽  
pp. 3874-3881 ◽  
Author(s):  
Min Cui ◽  
Lin Wang ◽  
Xianwei Guo ◽  
Errui Wang ◽  
Yubo Yang ◽  
...  
Keyword(s):  
Composite Material ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Low Cost ◽  
Lithium Ion ◽  
Macroporous Silicon ◽  
Composite Anode ◽  
Protective Layers ◽  
Silicon Based

A mass-produced and low-cost hierarchical mesoporous/macroporous silicon-based composite material with an ample porous structure and dual carbon protective layers has been rationally designed and constructed. The Si/SiO2@C composite anode materials for LIBs show enhanced electrochemical properties.

Ceramics

MRS Bulletin ◽  
1987 ◽  
Vol 12 (7) ◽  
pp. 25-28
Author(s):  
Robert J. Eagan
Keyword(s):  
High Performance ◽  
Space Shuttle ◽  
Raw Materials ◽  
Low Cost ◽  
Flat Glass ◽  
Grain Morphology ◽  
Heat Engines ◽  
Structural Applications ◽  
Simple Processing ◽  
Traditional Ceramics

Until the 1980s, most people thought of ceramics as artware and artifacts. The recent development of advanced ceramics for high performance thermal insulation (space shuttle tiles), high temperature structures (heat engines), and electronics (superconductors) has dramatically changed perceptions about the utility of ceramics.High technology ceramics are related to “traditional” ceramics only to the extent that they are inorganic, nonmetallic materials. Traditional ceramics are derived from minerals. For example, dinnerware and bricks consist mostly of clay, while sand is the major ingredient in flat glass and containers. Abundant raw materials, simple processing, adequate performance at low cost, and technological evolution have kept these industries viable for several thousand years.But, for demanding electronic or structural applications, synthesizing ceramics from minerals is often unacceptable. The chemical variability of mineral deposits, the difficulty of obtaining a homogeneous mixture of powders, and the problems of consolidating the powders into a uniform ceramic with desirable grain morphology, chemistry and grain boundary phases have stimulated the development of chemically derived ceramic precursors.

High Temperature Silicon Carbide Power Modules for High Performance Systems

2012 ◽  
Vol 717-720 ◽  
pp. 1219-1224 ◽  
Author(s):  
Alexander B. Lostetter ◽  
J. Hornberger ◽  
B. McPherson ◽  
J. Bourne ◽  
R. Shaw ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
High Speed ◽  
High Performance ◽  
Extreme Environment ◽  
High Energy ◽  
Power Modules ◽  
High Performance Systems ◽  
Silicon Based ◽  
High Speed Switching

The demands of modern high-performance power electronics systems are rapidly surpassing the power density, efficiency, and reliability limitations defined by the intrinsic properties of silicon-based semiconductors. The advantages of silicon carbide (SiC) are well known, including high temperature operation, high voltage blocking capability, high speed switching, and high energy efficiency. In this discussion, APEI, Inc. presents two newly developed high performance SiC power modules for extreme environment systems and applications. These power modules are rated to 1200V, are operational at currents greater than 100A, can perform at temperatures in excess of 250 °C, and are designed to house various SiC devices, including MOSFETs, JFETs, or BJTs.

scholarly journals Trends in Gasoline Engines Technology

2005 ◽  
Vol 121 (2) ◽  
pp. 3-19
Author(s):  
Hubert FRIEDL ◽  
Paul KAPUS
Keyword(s):  
High Performance ◽  
Phase Shifter ◽  
Low Cost ◽  
Direct Injection ◽  
Fuel Efficiency ◽  
Charge Motion ◽  
Passenger Cars ◽  
Gasoline Engines ◽  
Improve Fuel Efficiency ◽  
Variable Valve

The development of vehicle powertrains is increasingly challenged by emission legislation and by the end-users’ fueleconomy demands. In order to meet these requirements it is necessary to continuously improve existing powertrains and to develop totally new generations of engines. For Gasoline engines in passenger cars the most important task is to improve fuel efficiency. Therefore, a big variety of different technologies potentially can be applied. The system range from simple variable charge motion and low cost variable valve timing devices up to highly sophisticated systems like fully variable valve actuation systems and also combustion with auto ignition (HCCI). Direct Gasoline Injection systems of Generation 1 (wall guided systems) and even more the systems of Generation 2 (spray guided systems) improve fuel efficiency, but the significant oncosts for NOx exhaust aftertreatment have to be taken into consideration. Due to its full load benefits homogeneous DGI is a preferred solution for high performance engines as well as in combination with turbocharging for downsizing/downrating concepts. The combination of turbocharging, direct injection and cam phase shifter has proven to be a highly attractive package combining good fuel economy with fun to drive. The different gasoline engines technologies will have to be applied according to the specific needs of their application and brand specific requirements. Even keeping high performance characteristics, fuel consumption will be reduced continuously and future legislative limits can be met. However, system complexity and cost will increase.

Enhancement of Wettability of Aluminum Based Silicon Carbide Reinforced Particulate Metal Matrix Composite

2014 ◽  
Vol 0 (0) ◽  
Author(s):  
V. K. Singh ◽  
Sakshi Chauhan ◽  
P. C. Gope ◽  
A. K. Chaudhary
Keyword(s):  
Silicon Carbide ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
High Performance ◽  
Low Cost ◽  
Cast Aluminum ◽  
Dispersion Phase ◽  
Particulate Metal ◽  
The Matrix

AbstractLately, materials research has shifted to composite materials from monolithic, adjusting to the global need for light weight, low cost, quality, and high performance in structural materials. Every effort aims to develop a material which can be appropriate for various industry and machinery purpose. In the present study, a modest attempt has been made to develop cast aluminum based silicon carbide (SiC) particulate metal matrix composite (MMC) and worked upon to raise the wettability factor between the matrix and dispersion phase. Magnesium (Mg) is used as wetting agent. It works by scavenging the oxygen from dispersoids surface and thinning the gas layer around dispersoids and this is done by forming MgO or MgAl

Aero Engine Development for the Future

1983 ◽  
Vol 197 (3) ◽  
pp. 149-157 ◽  
Author(s):  
H W Bennett
Keyword(s):  
Mechanical Design ◽  
Low Cost ◽  
Fuel Efficiency ◽  
Thermodynamic Cycle ◽  
Aircraft Engine ◽  
Advanced Technology ◽  
High Fuel Efficiency ◽  
Aero Engine ◽  
Improved Performance ◽  
And Performance

A historical survey of the development and future trends in aero engine design and performance are given. Emphasis is placed on the achievement of low cost of ownership through high fuel efficiency. Simple basic principles controlling the conceptual design and performance are described. The choice of engine thermodynamic cycle is discussed with emphasis on the civil transport engine. The differing requirements of the military aircraft engine are briefly stated. Short-term possibilities for improved performance and longer term speculative proposals are made. Advanced technology requirements in materials, mechanical design and aerodynamics are outlined.

A facile, low-cost synthesis of high-performance silicon-based composite anodes with high tap density for lithium-ion batteries

2015 ◽  
Vol 3 (5) ◽  
pp. 2399-2406 ◽  
Author(s):  
Sang-Ok Kim ◽  
Arumugam Manthiram
Keyword(s):  
Electrochemical Performance ◽  
High Performance ◽  
Low Cost ◽  
Lithium Ion ◽  
Synthetic Process ◽  
Tap Density ◽  
Carbon Coated ◽  
Composite Anodes ◽  
Silicon Based ◽  
Enhanced Electrochemical Performance

Micro-sized carbon-coated Si-based composite synthesized by a low-cost and scalable synthetic process exhibits enhanced electrochemical performance with a high tap density of ∼1.34 g cm−3.

A low cost, high performance, 1.2m off-axis telescope built with NG-Xinetics silicon carbide

2011 ◽  
Author(s):  
Justin J. Rey ◽  
John A. Wellman ◽  
Richard G. Egan ◽  
Richard J. Wollensak
Keyword(s):  
Silicon Carbide ◽  
High Performance ◽  
Low Cost
Sign in / Sign up

Export Citation Format

Share Document