Time：2023.08.28Browse：1
The factors that affect the impregnation effect include: firstly, the impregnation process conditions (such as temperature and pressure), and secondly, the physicochemical properties of the impregnation.
Influence of process conditions
(1) Temperature (product preheating temperature, impregnation tank temperature, impregnation agent temperature), depending on the impregnation process: 1. The product is preheated too high and is prone to oxidation; The temperature is too low, and when it comes out of the preheating box, it quickly cools down and enters the impregnation tank. When the impregnating agent encounters cold products, its viscosity increases and its fluidity deteriorates, resulting in poor impregnation effect. 2. If the tank temperature is too high, asphalt is prone to oxidation condensation reaction, viscosity will also increase, and flowability will deteriorate; The tank temperature is too low, the fluidity of asphalt is also poor, and the impregnation effect is not ideal.
(2) Pressure (vacuum degree of the impregnation tank, pressure and time of pressurization)
The influence of the physicochemical properties of impregnating agents
(1) The higher the density of the impregnating agent, the higher the coke residue rate and the better the impregnation effect.
(2) It is better to have an appropriate viscosity. The smaller the viscosity of the impregnating agent, the better its fluidity, and it is easier to penetrate into smaller pores. However, if the viscosity is too small, the amount of coke formation will inevitably decrease.
(3) The higher the surface tension of the impregnating agent liquid, the better. The higher the surface tension, the smaller the wetting contact angle on the surface of the product, resulting in a higher capillary osmotic pressure and better wetting of the product, resulting in a better impregnation effect.
(4) The smaller and more spherical the suspended solids in the impregnating agent, the better. If the penetration force of spherical fine particles is strong, the impregnation effect is better.
2023-12-12There are weak van der Waals forces between layers in the structure of graphite, and these interactions are disrupted under high temperature conditions, leading to interlayer detachment of graphite.
Graphite powder is a wear -resistant material, and its self -lubrication performance is its most important feature. Graphn powder has a good self -lubrication performance due to its special layer -shaped crystal structure. The following are the analysis of the reasons for the self -lubricating property of graphite powder:The carbon atoms in graphite lattles are arranged in hexagonal on different planes. The distance between the carbon atoms in the same plane layer is 1.42 meters, and the distance between the carbon atom of each plane layer is 3.35. They are staggered along the same direction, repeat the position of the first plane in the third plane, the fourth plane repeats the position of the second plane, and so on. In each plane layer, because the carbon atoms are relatively tight, the binding forces between them are relatively large, and the carbon atom between layers and layers is far from each other, which is easy to separate and relatively slide. This is the main reason why gr2023-04-07Graphite powder has the cause of self -lubrication performance analysis
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