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月薪6500-7500，
不限学历，
需身体健康正常。
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Common Applications of Catalytic Converter Substrates
Catalytic converter substrate. Gasoline engines. Three-way converters. CO, HC, NOx reduction. Diesel engines. DOC, DPF, SCR. Oxidation, particle filtration, selective reduction. Turbo engines.
Thermal load. Vibration. Heavy trucks, off-road, generators. Metallic-core substrates. Mass flow.
Thermal cycling. Marine engines. Stationary equipment. Material, cell density, wall thickness, coating.
Metallic substrate. Light-off, mechanical strength, vibration. Ceramic substrate. Thermal resistance, long-term stability. Mounting brackets. Hangers. Flow distribution. Flow resistance. Thermal shock. Vibration test.
Exhaust flow is uneven. Straighteners guide gas to the catalyst. Cell size, wall thickness, material affect flow and pressure drop. Metallic straighteners handle high temperature, vibration, thermal cycles. Ceramic straighteners are rigid, heat slower, resist chemicals.
Install straighteners upstream of catalyst. Geometry must match engine flow and exhaust speed. Wrong design causes uneven flow, hot spots, higher back pressure, lower catalyst efficiency.
Material must tolerate peak exhaust temperatures and rapid thermal changes. Turbocharged or high-output engines often need metallic straighteners for faster light-off and lower restriction.
Straighteners must resist vibration, thermal expansion, wear. Honeycomb alignment and coating must remain intact under repeated heating and cooling.
Match straightener design to engine and exhaust characteristics. Proper design ensures uniform gas distribution, protects the catalyst, maintains emission targets over system life.
Metallic Substrate Catalytic Converter
How Metallic Substrate Catalytic Converters Work
Metallic substrate catalytic converters use a thin metal foil formed into a honeycomb structure. The foil is usually FeCrAl alloy, corrugated and stacked to create parallel flow channels. The substrate sits inside a welded steel housing, directly in the exhaust stream.
Exhaust gas flows through the channels. Flow remains mostly linear, with pressure drop determined by channel density and foil thickness. The foil is coated with a thin washcoat that holds the catalyst. The coating is stable under repeated heating and cooling and does not block the channels.
When the substrate reaches operating temperature, chemical reactions occur on the coated walls. Carbon monoxide and hydrocarbons oxidize. Nitrogen oxides reduce. The catalyst itself is not consumed.
Metal conducts heat efficiently, so the substrate heats evenly and reaches activation temperature quickly. This improves cold-start performance. Thin foil walls reduce back pressure compared to ceramic substrates, which benefits turbocharged and high-flow exhaust systems.
The structure absorbs vibration and thermal expansion without cracking. Durability is high even under rapid temperature changes or harsh operating conditions. Performance depends on substrate geometry, coating quality, and exhaust temperature, not on a single parameter. When these are matched, metallic substrate catalytic converters provide stable emission control over long periods.