16 6月 Alu Refine Flux
Alu Refine Flux uses nitrogen chlorine or argon chlorine as the refining gas to deliver to the melt to achieve the refining effect. Generally, hoses and iron pipes are used to convey the refining gas.
After refining with refining gas, when closing the manual ball valve on the refining pipeline, because the hose and iron pipe are longer, usually more than 20 meters, so more refining gas remains in the hose and iron pipe.
When the iron pipe is pulled out, a large amount of yellow smoke is generated, which has a strong irritating smell. In addition, if it is exposed to the melt for a long time, the residual refined gas will continue to overflow out, which seriously affects the working environment and also has a certain corrosive effect on plant equipment.
After a long time of exposure, the refining gas reacts with the moisture of the air to have a certain corrosion and moisture regain on the iron pipe and ball valve. The moisture regain will also affect the product quality when it is used again.
Aluminum alloy has low density, but relatively high strength, close to or exceeds high-quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance, widely used in industry.
However, the casting aluminum alloy may cause a series of defects in the casting during the smelting process, such as pinholes, pores, slag inclusions, etc., which seriously affects the quality of the aluminum alloy casting.
In order to improve the quality of aluminum alloy castings, the treatment of aluminum alloy melt is an important link. The main task of aluminum alloy melt treatment is to improve the purity of the alloy liquid, and the means to improve the purity is refining.
Alu Refine Flux is very important for the aluminum alloy smelting process. Refining can remove hydrogen and remove oxide inclusions to achieve the purpose of eliminating pinholes in castings, thereby improving the mechanics and performance of aluminum alloy castings.
At present, although the aluminum alloy Alu Refine Flux can remove some inclusions and reduce the hydrogen content, the aluminum alloy smelting process with more inclusions, especially the inclusion removal effects of fine inclusions and non-metal oxides, etc., cannot meet the requirements, and It is also impossible to refine and modify the aluminum alloy melt while removing impurities from the aluminum alloy melt, thereby better improving the mechanics and performance of the aluminum alloy casting.
Aluminum alloy materials are widely used in the fields of automobiles, aviation, etc. due to their advantages of light weight, high strength, high elasticity and good elasticity. Especially with the vigorous development of the automobile industry in recent years, the use of aluminum alloy materials to prepare automobile parts has become the main means to achieve light weight.
A356. 2 aluminum alloy is an important material for the automotive industry, especially for casting wheels.
This kind of aluminum alloy belongs to the Al-Si-Mg series alloy, the mass content of Si is 6.5% -7.5%, due to the high mass content of Si, it belongs to the hypoeutectic structure, so it is usually used to add a refiner to modify Agents to achieve the effect of refinement and modification, thereby improving the final structure and properties of the alloy.
In the manufacturing process of A356. 2 aluminum alloy wheels, the most widely used Alu Refine Flux and modifiers are Al-5Ti-lB alloy and Al-10Sr alloy, respectively.
The refinement effect of Al-5Ti-lB alloy is closely related to the size and shape of TiB2 and TiA13 particles in the matrix.
TiB2 has a greater tendency to segregate during standing, resulting in the reduction of a-A1 nucleation particles. Therefore, when the residence time of the aluminum liquid is too long, its refining effect will be greatly weakened.
The modification agent Al-lOSr has a longer modification time and a better modification effect.
However, in the actual casting process, the modification effect of the Sr-containing modifier is not stable. During the addition process, Sr is easy to burn, and the modification effect is attenuated sharply after the modification life is exceeded. In addition, the Sr-containing modifier is easy to inhale, which leads to shrinkage. Defects such as holes.
With the continuous development and exploration of refiners and modifiers, it is found that rare earths have certain refinement and modification capabilities.
my country is the country with the largest reserves of rare earth. With the rapid development of the rare earth industry, the development costs of light rare earth elements such as lanthanum (La) and cerium (Ce) have dropped sharply, and it is expected to be widely used in aluminum alloy materials.
The addition of rare earth elements not only has the effect of refining and modifying, but also can play a role in purifying the melt, so it is considered to be the most developed potential aluminum alloy refining and modifying agent.
However, judging from the results of a large number of studies, the refinement and modification effect is still not ideal. The addition of rare earth elements to improve the structure and performance has become the focus of research in recent years.