The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform
Tangali S. Sudarshan - One of the best experts on this subject based on the ideXlab platform.
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Molybdenum silicide based materials and their properties
Journal of Materials Engineering and Performance, 1999Co-Authors: J. Stiglich, Tangali S. SudarshanAbstract:Molybdenum disilicide (MoSi_2) is a promising candidate material for high temperature structural applications. It is a high melting point (2030 °C) material with excellent oxidation resistance and a moderate density (6.24 g/cm^3). However, low toughness at low temperatures and high creep rates at elevated temperatures have hindered its commercialization in structural applications. Much effort has been invested in MoSi_2 composites as alternatives to pure molybdenum disilicide for oxidizing and aggressive environments. Molybdenum disilicide-based heating elements have been used extensively in high-temperature furnaces. The low electrical resistance of silicides in combination with high thermal stability, electronmigration resistance, and excellent diffusion-barrier characteristics is important for microelectronic applications. Projected applications of MoSi_2-based materials include turbine airfoils, combustion chamber components in oxidizing environments, missile nozzles, molten metal lances, industrial gas burners, diesel engine Glow Plugs, and materials for glass processing. In this paper, synthesis, fabrication, and properties of the monolithic and composite molybdenum silicides are reviewed.
Olaf Toedter - One of the best experts on this subject based on the ideXlab platform.
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Glow Plugs group controlling method for diesel engine involves calculating electric resistance of Glow Plugs by subtracting resistance of supply line of plug Glowing element during engine operation
2007Co-Authors: Andreas Bleil, Olaf ToedterAbstract:The method involves connecting Glow Plugs (4) to a direct current supply by individual supply lines and operating the Glow Plugs by a pulse width modulation method. Electric resistance of the Glow Plugs is calculated by subtracting the resistance of the supply line of a plug Glowing element during the engine operation. A relative pulse width is calculated for controlling the Glow Plugs. The resistance of the current paths in a control device is included for the calculation of the resistance of the Glow Plugs.
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method and apparatus for driving the Glow Plugs of an autoignition internal combustion engine
2006Co-Authors: Andreas Bleil, Markus Kernwein, Helmut Muller, Odd Peters, Olaf ToedterAbstract:Method and apparatus for driving the Glow plug of a compression-ignition internal combustion engine. The respective related type of the Glow Plugs is determined by a gluhkerzentypischer parameters, such as the electric Glow plug resistance is detected and evaluated. The detected values of the gluhkerzentypischen parameter are compared with corresponding data stored in the Glow control data for different Glow plug, whereby the Glow plug is determined. After detection of the Glow plug are likewise stored sets of parameters corresponding to the particular Glow plug, used to control the Glow Plugs.
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a method for driving a set of Glow Plugs in a diesel engine
2006Co-Authors: Markus Kernwein, Olaf ToedterAbstract:Verfahren zum Ansteuern einer Gruppe von Gluhkerzen in einem Dieselmotor, welche durch individuelle Zuleitungen mit einer Gleichstromquelle verbunden sind und durch ein Verfahren der Pulsweitenmodulation jedenfalls im zeitlichen Mittel bei der gleichen Temperatur betrieben werden sollen, dadurch gekennzeichnet, dass durch das Verfahren der Pulsweitenmodulation die pro Periode in die Gluhkerzen einzubringende elektrische Energie festgelegt wird, wobei in einer Periode der Pulsweitenmodulation durch Vorgeben einer Spannung und einer relativen Pulsweite, wahrend welcher die Spannung an der Gluhkerze liegt, eine gewisse elektrische Energie in die Gluhkerze gespeist wird, dass in derselben Periode die tatsachlich eingebrachte Energie ermittelt und ein Fehlbetrag oder Uberschuss an in der Periode eingebrachter Energie im Vergleich zu der in die Gluhkerzen einzubringenden vorgegebenen Energie in einer folgenden Periode ausgeglichen wird.
J. Stiglich - One of the best experts on this subject based on the ideXlab platform.
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Molybdenum silicide based materials and their properties
Journal of Materials Engineering and Performance, 1999Co-Authors: J. Stiglich, Tangali S. SudarshanAbstract:Molybdenum disilicide (MoSi_2) is a promising candidate material for high temperature structural applications. It is a high melting point (2030 °C) material with excellent oxidation resistance and a moderate density (6.24 g/cm^3). However, low toughness at low temperatures and high creep rates at elevated temperatures have hindered its commercialization in structural applications. Much effort has been invested in MoSi_2 composites as alternatives to pure molybdenum disilicide for oxidizing and aggressive environments. Molybdenum disilicide-based heating elements have been used extensively in high-temperature furnaces. The low electrical resistance of silicides in combination with high thermal stability, electronmigration resistance, and excellent diffusion-barrier characteristics is important for microelectronic applications. Projected applications of MoSi_2-based materials include turbine airfoils, combustion chamber components in oxidizing environments, missile nozzles, molten metal lances, industrial gas burners, diesel engine Glow Plugs, and materials for glass processing. In this paper, synthesis, fabrication, and properties of the monolithic and composite molybdenum silicides are reviewed.
Akira Okada - One of the best experts on this subject based on the ideXlab platform.
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automotive and industrial applications of structural ceramics in japan
Journal of The European Ceramic Society, 2008Co-Authors: Akira OkadaAbstract:Abstract This paper reviews the status of structural ceramics in Japan. Until around 1980, successful applications of these materials were limited to wear-resistant parts and structural components working under very low stresses. Considerable work has been done over the years on applying ceramics to mechanical parts used under higher stresses. This led to some successful applications of silicon nitride to automotive components, including turbocharger rotors and Glow Plugs. However, the recent market for silicon nitride automotive components has not been as large as was expected. Cordierite honeycombs for catalysts and diesel particulate filters made of silicon carbide are becoming more important applications in Japan. It is noteworthy that the Japanese market for structural ceramics has been steadily increasing since 1985, with the leading applications being apparatus for purifying the exhaust gas of automotive engines and parts for semiconductor manufacturing equipment. Alumina, for example, is widely used for vacuum process chambers. High-purity alumina is also used for the components of liquid crystal device manufacturing equipment and various mechanical parts. The recent applications of structural ceramics in Japan summarized in this review include vacuum process chambers for manufacturing semiconductor and liquid crystal devices, wear-resistant ceramics used for steel-making, optical lens forming and cutting tools, refractory tubes for casting aluminum alloys, and automotive applications.
Rong Fang Horng - One of the best experts on this subject based on the ideXlab platform.
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Transient behaviour of a small methanol reformer for fuel cell during hydrogen production after cold start
Energy Conversion and Management, 2005Co-Authors: Rong Fang HorngAbstract:The cold start transient characteristics of a small methanol reformer for a fuel cell were investigated. The main parameters studied were the oxygen to methanol mol ratio (O/C), fuel supply rate, heating power and heating temperature. The composition of the gas produced by the reformer was analysed. The main aim of this paper was to determine a favorable combination of the parameters for obtaining rapid hydrogen production during the transient behaviour of the reformer. A small methanol reformer with fuel, air and water injectors, heaters and a catalyst was constructed. Vaporised methanol was injected into the reformer, which then flowed into the catalyst. For the purpose of enhancing the response of the cold start transient reaction, eight Glow Plugs were mounted at the inlet of the catalyst to control the flow temperature together with the adjustment of the oxygen to methanol mol ratio. The best response from cold start was obtained with 960 W heating power, 80 °C heating temperature, 14 mL/min methanol and 70 L/min air supply rates among the experimented parameters. Under this operation setting, hydrogen was produced after 220 s from cold start with the production rate stabilising after 4-5 min and eventually reaching the highest concentration at 350 °C. Generally, hydrogen commenced production at a catalyst outlet temperature of 100 °C and stabilised at 350 °C. © 2004 Elsevier Ltd. All rights reserved.