This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Substrate/Washcoat Interaction in Thin Wall Ceramic Substrates
Annotation ability available
Sector:
Language:
English
Abstract
Stringent emissions standards for HC, CO and NOx have necessitated the development of thin wall ceramic substrates which offer higher surface area, larger open frontal area and lower thermal mass. Such substrates offer the additional benefit of being compact which make them ideal for manifold mounting in the engine compartment. These attributes of ceramic substrates, following washcoat and catalyst application, translate directly into quick light-off, high conversion efficiency and low back pressure. To preserve these advantages at high operating temperature and still meet 100,000 mile vehicle durability, the thermomechanical interaction between the substrate and thin wall washcoat system must be managed carefully via formulation, % loading and the calcination process.
This paper presents the physical properties data for thin wall ceramic substrates before and after the washcoat application. The impact of washcoat adhesion and % loading on these properties over the operating temperature range will also be discussed. These data in turn will help assess the long-term durability of thin wall ceramic converter system.
Recommended Content
| Technical Paper | Simultaneous PM and NOx Reduction System for Diesel Engines |
| Journal Article | Impact of Ceramic Substrate Web Thickness on Emission Light-Off, Pressure Drop, and Strength |
Authors
Citation
Gulati, S., "Substrate/Washcoat Interaction in Thin Wall Ceramic Substrates," SAE Technical Paper 990013, 1999, https://doi.org/10.4271/990013.Also In
References
- Gulati, S.T. et al. Advanced Three-Way Converter System for High Temperature Exhaust Aftertreatment,” SAE 970265 1997
- Gulati, S.T. “Ceramic Catalyst Supports for Gasoline Fuel,” Chapter 2, Structured Catalysts and Reactors 1997
- Gulati, S.T. et al. “Fatigue and Performance Data for Advanced Thin Wall Ceramic Catalysts,” SAE 980670 1996
- Nunan, J.G. et al. “Advanced TWC Technologies Using Ce0 2 /Zr0 2 Solid Solutions,” SAE 960798 1996
- Nunan, J.G. et al. “Impact of Pt-Rh and Pd-Rh Interactions on Performance of Bimetal Catalysts,” SAE 950258 1995
- Locker, R.J. et al. “Demonstration of High Temperature Durability for Oval Ceramic Catalytic Converter,” SAE 980042 1998
- Fox, D. et al. “Vibration Characterization of Intumescent Mat Mounted Ceramic Preconverters,” SAE 980051 1998
- Gulati, S.T. “New Developments in Catalytic Converter Durability,” 1990
- Day, J.P “The Design of a New Ceramic Catalyst Support,” SAE 902167 1990
- Gulati, S.T. et al. “Thermal Shock Resistance of Oval Monolithic Heavy Duty Truck Converters,” SAE 88010 1988
- Gulati, S.T. Chen, D.K.S. “Isostatic Strength of Porous Cordierite Ceramic Monoliths,” SAE 910375 1991
- Gulati, S.T.. “Long-Term Durability of Ceramic Honeycombs for Automotive Emissions Control,” SAE 850130 1985
- Timoshenko, S.P. “Strength of Materials, Part II,” Van Norstrand Co. 1954
- Grinter, L.E. “Numerical Methods of Analysis in Engineering,” MacMillan Co. 1949
- Gulati, S.T. “Cell Design for Ceramic Monoliths for Catalytic Converter Application,” SAE 881685 1988
- Gulati, S.T. “Effects of Cell Geometry on Thermal Shock Resistance of Catalytic Monoliths,” SAE 75071 1975
- Gulati, S.T. et al. “Impact of Washcoat Formulation on Properties and Performance of Cordierite Ceramic Converters,” SAE 912370 1991
- Gulati, S.T. et al. “Optimization of Substrate/Washcoat Interaction for Improved Catalyst Durability,” SAE 910372 1991
- Gulati, S.T. et al. “Improvements in Converter Durability and Activity via Catalyst Formulation,” SAE 890796 1989