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Heat shields/exterior parts
summary: There is a high specific heat capacity. This means that after absorbing a certain amount of thermal energy, the temperature rises lower than that of many other materials. 70% of thermal management tasks in automobiles can be handled by aluminum surfaces alone. The remaining 30% must be disposed of with a properly designed heat shield.
category：
summary
Common materials and characteristics of heat shields
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ordinal number No |
> the name of the material Material Name |
common material standard Material Standard |
material properties Material Physical properties |
|
1 |
thin aluminum foil Aluminum Foil 1060- O state |
GB/T 3880 General industrial aluminum and aluminum alloy plate, strip |
good heat insulation, the knurled aluminum foil increases the surface area to improve the diffuse reflection of heat, and play a better thermal insulation effect. Easy to form, aluminum foil is thin and soft, easier to achieve relatively complex structure. Light weight, aluminum foil itself light weight, suitable for models with limited weight on the body. but poor strength, easy to deform, often use tundish sandwich structure coated with high-temperature resistant fiber materials, mostly used for non-appearance parts with high thermal insulation requirements. |
|
2 |
thick aluminum plate Aluminum Alloy 1060- O state |
GB/T 3880 General industrial aluminum and aluminum alloy plate, strip |
aluminum plate itself has good thermal insulation, better strength than aluminum foil, relatively light quality and easy to form, can be anodized and other surface treatment, but high price, suitable for light vehicle appearance parts with high thermal insulation requirements. |
|
3 |
aluminized steel sheet Aluminized Steel SAID for heat resistance (for deep drawing). |
JIS G3314 hot-dip aluminized steel sheet and coil |
mechanical properties are close to steel plates, heat insulation is worse than aluminum, surface aluminum plating, play the role of heat insulation and corrosion prevention, good strength, but poor forming ability, complex structural forms are difficult to achieve, low cost but heavier weight, mostly used for parts with low temperature insulation requirements, high strength requirements and models with less stringent body weight. |
|
4 |
stainless steel Stainless Steel SUS |
JIS G4305 cold-rolled stainless steel plate and strip |
stainless steel structure strength is good but not easy to achieve complex forming, mostly used for bending structural parts, stainless steel corrosion resistance but relatively high price, often used in heat insulation requirements are not high but strength requirements are high and need polishing, wire drawing and other surface treatment of high-demand appearance parts. |
Aluminum is the ideal insulating material:
(1) High reflectivity, low emissivity, absorption and re-emission of very little infrared radiation;
(2) High thermal conductivity ensures that heat energy is quickly conducted from potential hot spots in the aluminum heat shield;
(3) It has a high specific heat capacity. This means that after absorbing a certain amount of thermal energy, the temperature rises lower than that of many other materials. 70% of thermal management tasks in automobiles can be handled by aluminum surfaces alone. The remaining 30% must be disposed of with a properly designed heat shield.
(4) Excellent corrosion resistance. Environmental factors such as humidity and high temperature greatly promote the corrosion effect of the heat shield. In addition, most heat shields are directly exposed to road pollution. Contaminants such as salt water, liquid asphalt, street dirt and mud must not cause unacceptable corrosion of the heat shield during the service life of the vehicle.
(5) Provide sufficient fracture resistance. Gravel and slight ground contact may cause local deformation of the lower heat shield, and the aluminum structure heat shield is less prone to cracks.
(6) Aluminum plate and aluminum foil are very suitable for meeting various forming and service requirements of heat insulation covers. The heat shield must be as close as possible to the hot part. Space is limited, especially in the engine compartment and lower body area, so thermal shields often have fairly complex shapes to fit snugly into different components.
Tianfu company heat shield commonly used structural design scheme
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> commonly used structure Common Structure |
apply effects Application Comments |
temperature resistance High Temperature Resistance |
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aluminized steel sheet metal heat shield |
aluminized steel plate, mechanical properties close to steel plate, surface aluminum plating, play the role of heat insulation and corrosion prevention. The structural strength is good, the forming capacity is average, the cost is low, but the weight is heavier. It is suitable for places with low temperature insulation requirements and high strength requirements. |
can be installed at 850°C heat source surface |
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aluminized steel sheet + insulation fiber sandwich structure heat shield |
the structure commonly used in the exhaust manifold heat shield at this stage, but when the temperature itself exceeds 600 °C, ablation will occur in the aerobic environment, which will affect the thermal insulation effect and the high temperature resistance will deteriorate. |
600℃ |
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aluminum foil + heat insulation fiber (or domestic ceramic fiberboard). sandwich structure heat shield |
aluminum foil itself has good thermal insulation effect, but when the temperature of the thermal insulation fiberboard itself exceeds 600 °C, ablation will occur in the aerobic environment, which will affect the thermal insulation effect and deteriorate the high temperature resistance. Domestic ceramic fiberboard can withstand temperatures up to 1000 °C, but the ingredients contain substances banned by EU REACH. The overall structural strength is poor and easy to deform. |
600℃ |
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embossed aluminum plate construction + reinforced mesh washer (single-layer, double-layer). metal heat shield |
good thermal insulation effect, light weight, with the mesh gasket can be directly installed on the surface of 850°C, high forming ability and seismic resistance, good noise attenuation performance, heat shield structure is not easy to deform and not easy to break. |
850℃ |
Appearance
thermal insulation
previous： Mica gasket
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