By Hans Bode
MACC 2001 is the successor assembly of the 1st foreign convention on fabrics features in automobile 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 relies on a ferritic metal with 5-8% aluminium, 17-22% chromium and small additions of reactive parts. greater than 20,000,000 devices have been produced in 1999. The ceramic-supported catalytic converter is predicated on corderite. The construction cost of ceramic-supported catalysts is way larger. either fabrics have particular benefits and drawbacks which make certain the applying for a given vehicle version. as well as those easy teams of catalytic companies, the scope of the convention additionally refers to coating points, because the impression of the coating composition is turning into increasingly more very important. the automobile and car-supplying industries document on their destiny requisites with admire to functionality and repair lifestyles. preserving reliable functionality is necessary relatively within the view of thinner helps and better temperatures. provider existence predictions, in keeping with modelling and simulation strategies, depends upon trustworthy fabrics' facts. This quantity will accordingly be important to all scientists and engineers concerned with the layout and improvement of automobile catalysts.
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Extra resources for Materials Aspects in Automotive Catalytic Converters
J. Quadakkers (eds) “Cyclic Oxidation of High Temperature Materials”, EFC Publication 27, IoM Communications, London, (1999).  G. Tatlock and S. Newcomb (eds), Special Issue of Material at High Temperatures on “Microscopy of Oxidation-4” Vol. 17(1) (2000).  M. J. Quadakkers and J. R. Nicholls (eds) “Life-time Modelling of High Temperature Corrosion Processes”, EFC Publication 28, IoM Communications, London (2001).  W. J. Quadakkers and K. Bongartz, Werst. U. Korros. 24, 232, (1994).
R. Nicholls, D. Naumenko and W. J. Quadakkers, “Mechanistic Understanding of Chemical Failure for FeCrAl-RE Alloys in Oxidising Environments” in “Lifetime Modelling of High Temperature Corrosion Processes”, (eds M. Schutze, W. J. Quadakkers and J. R. Nicholls) EFC publication 28, IoM Communications, London (2001). High Temperature Corrosion of FeCrAlY/Aluchrom YHf in Environments Relevant to Exhaust Gas Systems Angelika Kolb-Telieps1), Gernot Strehl2) , Dmitry Naumenko3), Willem. J. Quadakkers3) , Rachel Newton4) 1) Krupp VDM GmbH, Kleffstr.
The 1600 cpsi catalyst shows an improvement of 50 percent compared to a 600 cpsi catalyst. Uniform flow distribution is necessary to guarantee optimal utilisation of the catalyst volume. Often it is not possible to achieve a good flow in the car, par- 23 ticularly in the case of the close- coupled arrangement because of the spatial conditions. Due to the design freedom afforded by metal substrates, it is possible to produce cone-shaped catalysts (figure 8). The cone-shaped channels also guide the flow to the peripheral areas of the second substrate installed behind the „ConiCat®“, allowing better flow distribution and therefore a cost-optimised use of the catalyst system.