Aluminum Radiators Last Longer Than Copper Radiators
The radiator is an important part of the automobile engine cooling system. Its function is to dissipate the heat absorbed by the coolant in the engine water jacket from the high-temperature parts to the air. Therefore, the performance of the car radiator directly affects the heat dissipation effect of the car engine, which will have a great impact on the power, economy and reliability of the car.
With the continuous improvement of the speed and power of the automobile engine, the heat load is also getting higher and higher, and the requirements for the cooling system are getting higher and higher. People pay more and more attention to the research of the cooling system including the radiator, new technologies and new materials. keep appearing. The advantages of automotive aluminum radiator products are reflected in light weight, high reliability, low price and environmentally friendly production. The use of aluminum water tanks by OEMs to replace the original copper water tanks is an inevitable trend in the development of automotive radiator technology. At present, automobile radiators are developing in the direction of light weight, high efficiency and economy. More than 90% of passenger car products use aluminum radiators, and the proportion of use in medium and heavy trucks will gradually increase.
1. Performance comparison of aluminum radiator and copper radiator
From the two materials of copper and aluminum, the heat dissipation coefficient of copper is higher than that of aluminum. Under normal circumstances, the heat dissipation performance of copper radiator is higher than that of aluminum radiator with the same size and size, but the actual situation The heat dissipation performance of aluminum radiators is higher than that of copper radiators. This is first caused by the processing technology. The core of the copper radiator is welded with lead-tin alloy, and the thermal conductivity of the alloy is only 23% of that of aluminum, resulting in a large thermal resistance for heat transfer; in addition, the copper radiator dissipates heat during the welding process. The filler between the belt and the water pipe reacts with the matrix to form a thick copper-tin alloy, which also seriously affects its heat dissipation. The solder used in the aluminum radiator is silicon aluminum alloy, which is the same as the material of the parent body. After being melted in the brazing furnace, a part of it will diffuse into the base metal. Smaller, so the heat dissipation performance of brazed aluminum radiator is higher than that of copper radiator. Usually, the heat dissipation performance of aluminum radiator is about 10% higher than that of copper radiator for radiators of the same specification.
2. The service life of aluminum radiator is higher than that of copper radiator
Due to the different welding equipment and process methods used for copper and aluminum radiators, the structural strength of their products is quite different. The aluminum radiator is welded by brazing, and the welding temperature is 577~612 ℃, while the copper radiator is soldered, and the welding temperature is lower than 450 ℃. The shear strength of the welded joint of the aluminum radiator is 50~58MPa, the tensile strength is 86~96MPa, and the torsional strength of the copper radiator tin welding is 34~37MPa, so the structural strength of the aluminum radiator is much higher than that of the copper radiator. . Considering the difficulty of maintenance of aluminum radiators , manufacturers must consider the reliability and service life of products when selecting materials. Therefore, the reliability of aluminum radiators is much higher than that of copper radiators. The user's post-use maintenance cost.
On the other hand, the fact that aluminum radiators are inferior to copper radiators in terms of corrosion resistance requires users to use stricter conditions for automotive aluminum radiators than copper radiators. The main reason is that the user must use the antifreeze and antirust fluid specified by the vehicle manufacturer. At present, most vehicle manufacturers standardize the antifreeze and antirust fluid for the medium and heavy trucks that leave the factory. The corrosion problem of the aluminum radiator has been solved. Compared with the aluminum radiator and the copper radiator under the same conditions, the trouble-free mileage of the aluminum radiator is much higher than that of the copper radiator.
Through the above analysis, the aluminum radiator is no less than the copper radiator in terms of strength and reliability, and its weight and price are more advantageous. Based on the current technical state and processing technology level of the aluminum radiator, the aluminum radiator is replaced by an aluminum radiator. Copper radiators can fully meet the heat dissipation performance requirements of medium and heavy-duty trucks and engines. With the increasing requirements for lightweight and energy-saving automobiles, radiators as important parts of automobiles are also developing in the direction of high efficiency and light weight. Aluminum heat dissipation Due to its obvious advantages such as light weight, high reliability, low price and environmental protection, the truck will be more used in medium and heavy trucks.