Some problems pistons made from composite materials with small hysteresis to combustion engines

• Autorzy: Jankowska-Sieminska B.
• Języki publikacji: EN

Abstrakty

EN

Novel composite ma hysteresisterials on the pistons are characterised that they occur in them multiple intermetallic phases which crystallize in the high temperature, before crystallization of the alfa+beta (Al+Si) eutectic. For forming of pre-eutectic phases, chromium and molybdenum are introduced to silumins, and for derivation of multiple increased concentration of nickel and copper and decreased concentration of magnesium are accomplished. On the basis of evaluations of mechanical and thermal loads of combustion engines pistons applying essence of composite materials of combustion engines pistons, as well requirements for combustion engines pistons, especially high loaded engines are expressed. Test results of hardness, influence of temperature of casting, test results of mechanical properties, friction coefficient and coefficient of thermal expansion are presented in the paper. The special attention devoted to so called hysteresis coefficient of thermal expansion and hysteresis of the relative elongation in function temperature and time. Courses of coefficient of thermal expansion for standard and composite material are presented. Differences of the a coefficient during heating and cooling in function temperature are relative to kind of heat treatment. Two-stage heat treatment is beneficial for the obtainment small values of the a coefficient.

Słowa kluczowe

EN

combustion engines; combustion engine piston; composite alloys; thermal expansion; hysteresis

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2011
• Tom: Vol. 18, No. 3
• Strony: 123--128
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Jankowska-Sieminska B.

• Institute of Aviation Al. Krakowska 110/114, 02-256 Warsaw, Poland tel.: [phone], fax: [phone],

Bibliografia

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• [4] Jankowska, B., Jankowski, A., Preliminary researches of influence of different loads on working conditions and performances of the piston combustion engine with direct fuel injection, Journal of Polish CIMAC, Gdansk University of Technology, 2007.
• [5] Jankowska-Sieminska, B., Jankowski, A., Slezak, M., Analysis and Research of Piston Working Conditions of Combustion Engine in High Thermal Load Conditions, Journal of KONES, No. 3, 2007.
• [6] Jankowski, A., Sieminska, B., Slawinski, Z., The Resistance on Thermal Shocks of Combustion Engine Pistons, FISITA Transactions London 2007.
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• [8] Pietrowski, S., Siemińska-Jankowska, B., Współczynnik rozszerzalności liniowej siluminów badawczych i standardowych. Przegląd Mechaniczny, nr 17/18, 1994.
• [9] Sieminska, B., Jankowski, A., Pietrowski, S., Slezak, M., The Pistons from Novel Composite Alloys for Future Combustion Engines of Low Emission Exhausts Gases and Low Noise Levels, FISITA 2008 Congress Proceedings, F2008-06-180, Munich 2008.