1 Products Description
Bonding mechanism of bimetal composite
Energy theory
In 1958, AN Semulov put forward the energy viewpoint of metal bonding. He thinks that two metals are connected with each other.
At the time of contact, even if the metal atom is close to the order of lattice parameters, if the atom does not have the lowest energy for actual binding, it cannot be combined. This theory uses the view of atomic activation and believes that only when the activated atoms get enough energy and contact a certain distance between them, can a metal bond realizing the bonding between metals be formed.
However, this theory also has defects: the work hardening that leads to the increase of metal atomic energy does not promote the combination between metals but makes the binding ability between metals worse.
2 Products Features
Bonding mechanism of bimetal composite
Diffusion Theory
In the 1970s, H Kazakov proposed the diffusion theory of metal bonding, and he believed that.
In the process of deformation, due to the effect of deformation heat, the temperature of the metal contact area increases, and the metal atoms are activated, forming a very thin interdiffusion zone near the interface to achieve the bonding between metals. The role of diffusion is to increase the chance of interaction between two metal atoms and promote the combination between two metals. This theory explains the interface bonding of dissimilar metals from the perspective of metallurgy, which is an advanced aspect. However, it does not take into account the activation process of metal contact surfaces and the limitation of mutual diffusion on the bonding process of the entire contact zone. It cannot explain the fact that when the thickness of the diffusion zone reaches a certain level, the subsequent increase of the diffusion zone reduces the interface bonding performance of composite materials.
3Application of Clad Plate
A new type of kitchenware material has also appeared in China, which is made of Aluminum stainless steel bimetal clad plate. The middle layer is made of lead material, which not only combines the characteristics of bright and easy cleaning stainless steel surface, but also reduces the quality of kitchen utensils and increases the overall thermal conductivity of kitchen utensils. Therefore, in order to realize the high-quality connection of Zhaogang, the connection of Shaoxing stainless steel is of great significance in terms of demand.
However, it is very difficult to realize the spring joint of Shaoxing Steel, because the physical and chemical properties of the main element iron and copper in steel differ greatly.
4 FAQ
Bonding mechanism of bimetal composite
The above-mentioned mechanical plug extrusion and inlay function is a way to form the initial combination of Aluminum stainless steel bimetal clad plate. Of which the number of cracks and broken blocks is not very large, which only accounts for a part of the proportion. However, in the non crack areas and places without broken blocks, this mechanism of mechanical action obviously does not work. The TLK model considers that the surface of metal crystal is composed of a platform with a low exponential crystal face and monatomic steps with a certain density. These steps themselves contain twists of a certain density. These twists play an important role in the formation of surface defects or volume defects. With the increase of temperature, the number of twists will increase, that is, the roughness of the surface will increase. During metal plastic deformation, these convex concave will contact with each other and cause deformation and friction, which will generate deformation heat and friction heat, and raise the temperature of metal surface, and promote the combination between metals. After rolling, static friction exists on the contact surface due to the difference in the linear expansion coefficient of the clad and base metal and the recovery of part of the elastoplastic deformation, and some parts may be locked in contact. The existence of this static friction makes the composite layer and base metal more firmly combined. According to the properties of the object surface, when the metal is heated, the boss on its surface will increase, making the surface more rough, and the side wall of the boss will also be exposed to the surface, thus increasing the contact surface area of the metal. In addition, the side wall of the boss is composed of fresh metal atoms, whose side wall atoms are in the unsaturated state of metal bonds, which are conducive to the bonding between metals. However, if the heating temperature is too high, the combination will deteriorate due to serious oxidation. This is the so-called friction mechanism, which is another reason for the formation of initial bonding at the interface of rolled composite plates.
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