Materials Aspects in Automotive Catalytic Converters by Hans Bode

By Hans Bode

MACC 2001 is the successor assembly of the 1st overseas convention on fabrics elements in car Catalytic Converters, MACC '97, and concentrates at the high-temperature mechanical and oxidation behaviour of either metal-supported and ceramic-supported car catalysts. The metal-supported catalyst is predicated on a ferritic metal with 5-8% aluminium, 17-22% chromium and small additions of reactive components. greater than 20,000,000 devices have been produced in 1999. The ceramic-supported catalytic converter is predicated on corderite. The creation cost of ceramic-supported catalysts is way better. either fabrics have particular benefits and downsides which be sure the appliance for a given vehicle version. as well as those simple teams of catalytic vendors, the scope of the convention additionally refers to coating elements, because the impact of the coating composition is changing into progressively more very important. the auto and car-supplying industries file on their destiny specifications with recognize to functionality and repair existence. holding reliable functionality is essential relatively within the view of thinner helps and better temperatures. carrier lifestyles predictions, according to modelling and simulation ideas, is dependent upon trustworthy fabrics' info. This quantity will hence be worthwhile to all scientists and engineers fascinated by the layout and improvement of automobile catalysts.

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All foil samples were observed to fail by intrinsic chemical failure (InCF), when unconstrained. 0wt%) and parabolic kinetics, provides a conservative estimate of foil component life for a range of FeCrAl-RE materials over the temperature range 1100 °C–1400 °C. 6 References [1] World Energy Outlook, 2000, International Energy Agency. [2] W. Maus ‘Mobility, Prosperity and Environment Protection – the Catalytic Converter is Indispensable’, in “Metal-Supported Automotive Catalytic Converters” (ed.

Formation of a stable, protective oxide. e. water vapour content) and alloy composition. Spalling is not normally expected to occur for weak FeCrAl-RE foil materials and is usually only observed when the section thickness increases. 7wt%Al. For foil materials, stress relaxation processes usually ensure that internal stresses are not sufficient to cause failure and the foil will ultimately fail by intrinsic chemical failure (InCF) where CB approaches zero. However, geometric factors, such as sharp corners, holes, welds and changes in shape can provide stress raisers and may lead to local spallation.

27] G. J. Tatlock and H. Al-Badairy “The Oxidation of Thin Foils of FeCrAl-RE Alloys in Moist Air”, accepted for publication in Materials at High Temperatures (2001). [28] M. J. Bennett, R. Perkins, J. B. Price and F. Starr in Proc. “Materials for Advanced Power Engineering”, COST 501 (eds D. Coutsouradis et al), p1553, Kluwer Academic Publishers (1994). [29] J. Klower and A. Kolb-Telieps, “Effect of Aluminium and Reactive Elements on the Oxidation Behaviour of Thin FeCrAl Foils in “Metal-Supported Automotive Catalytic Converters” (eds H.

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