- 發布時間：2022-01-11 19:56:58
一、浸滲簡介Introduction of impregnation
1、 什么是浸滲What is infiltration
浸滲又稱含浸、浸透、滲透、浸漬英文單詞impregnution porous sealing是一種微孔（細縫）滲透密封工藝，將密封介質（通常是低粘度液體）通過自然滲透（即微孔自吸）抽真空和加壓等方法滲入微孔（細縫）中，將縫隙充滿然后通過自然（室溫）冷卻或加熱的方法將縫隙里的密封介質固定，達到密封縫隙的作用。
Impregnation, also known as leaching, soak, osmosis, dipping English word impregnution porous sealing is a kind of microporous thin seam permeability sealing process, the sealing medium (usually a low viscosity liquid) by natural penetration (i.e., microporous self-priming) vacuum and pressure infiltration microporous (crack), The gap is filled and then the sealing medium in the gap is fixed by natural (room temperature) cooling or heating method to achieve the role of sealing gap.
2、為什么要浸滲Why do you want to soak
Pores appear in materials is a common phenomenon, especially in die casting and powder metallurgy manufacturing process due to the residual pores, crystal shrinkage and other reasons inevitably form a large number of micropores, trachoma, cracks, etc., micropore leakage will bring hidden dangers to the use of machinery and equipment. Even for applications without pressure requirements, electroplating solution and acid solution of electroplating, painting and surface treatment may enter the inner part of the casting, leading to internal corrosion, shortening the service life of the parts. Due to the existence of micropores, the surface painting, plating and other bubbles are formed or uneven. By leaching the product scrap is almost zero, greatly saving the cost, making full use of limited resources, and producing more perfect products.
3、浸滲的作用和目的The function and purpose of infiltration
A, endowed with pressure resistance, sealing function
Fill the micropores of the product with the immersion solution to seal the product.
B, endowed with corrosion resistance function
Internal corrosion can be prevented by blocking the connected or not connected microholes
C. Pretreatment of synthetic processing
Fill the concave seam inside, can prevent discoloration, corrosion, stripping expansion
D, improve the performance of cutting
The immersion fluid filled with metal acts as a lubricant to extend tool life and reduce machining costs.
E. Improve physical strength
The infiltration solution filled and blocked the micropore internal gap is reduced, the physical strength is improved, and the product design can be thin-walled
F. Improve insulation
By plugging the internal cavity, the protective resistance value can be increased
4、浸滲的意義The significance of infiltration
Make full use of limited resources to the maximum extent, turn waste into treasure, save social energy, protect the natural environment.
二.浸滲技術的應用范圍The scope of application of infiltration technology
1、鑄件的浸滲 Infiltration of castings
The main effect of casting infiltration is to seal and prevent leakage so that it can be used in hydraulic and gas systems. For example, automobile and tractor gearbox, fuel pump, hydraulic valve, carburetor, cylinder, compressor and hydraulic components, closed aircraft instruments and electronic instruments, pneumatic parts and various pneumatic instruments, etc.
Castings infiltration can also prevent internal corrosion and improve production. As we all know, the internal corrosion of castings often starts from the micropores, when the micropores are filled with infiltration agent, to be cured, it can prevent the immersion of corrosive liquid, play the role of corrosion prevention.
In addition, the casting infiltration can also be prepared for plating, paint and other surface treatment, because the infiltration agent fills the gap in the casting, to avoid these gaps to absorb electroplating solution, resulting in bubbles and uneven surface after plating.
Infiltration can be used as a remedy for the defects of casting and die casting, such as porosity and microporosity, and also promote the thin-walled and light design of casting products, and save the consumption of materials.
2、粉末冶金件的浸滲 Leaching of powder metallurgy parts
Powder metallurgy material with excellent performance, so the lining suite of automobiles, tractors, valve guide, gear, CAM, bearings, clutch friction plate, electric heating element, heat exchanger, cutting tool, work mould and some corrosion resistant, high temperature oxidation resistance and high temperature parts are widely used in powder metallurgy materials.
Powder metallurgy parts are made of metal powder (or a mixture of metal and non-metal powder) as raw materials, pressed into shape after sintering and made into various types of workpiece. P/M parts are characterized by the existence of a network of pores (about 15% of the total volume), including small air gaps between powder and metal particles. Such pores still exist even in high density P/M parts. Therefore, P/M parts cannot preserve liquids. The infiltration treatment of P/M parts can make the inner pores completely filled with infiltration agent and achieve a permanent seal, so that it can be used in hydraulic systems, such as it can be made of precision oil pump accessories, compressor housing.
In addition, powder metallurgy parts before plating or other surface coating treatment, such as leaching treatment, bath and cleaning agents will not be sucked into the pores, can obtain a smooth surface and corrosion resistant workpiece.
It must be pointed out that the P/M parts should be leached immediately after sintering because the pores are clean and easy to be filled completely by the leach agent. The cutting performance of the P/M parts after infiltration can also be improved (the cutting tool will change from interrupted cutting to continuous cutting after filling the microhole) to facilitate the control of the technological process.
3、電子器件的浸滲 Infiltration of electronic devices
The infiltration of electrical components such as transformers, capacitors and motors can increase their dielectric properties and insulation properties. For example, the motor stator and shell assembly components, after the impregnation, form a single whole microporous to seal after impregnation, and increase the strength and heat dissipation effect, solved the insulation of the motor due to the vibration reducing performance, at the same time after the impregnation of motor in damp environment can still keep good insulation performance, improve the reliability and service life of the motor.
4、非金屬件的浸滲 Infiltration of non-metallic parts
Non-metallic materials, such as wood (ties, telephone poles, etc.), ceramics and fibre-plastic composites, can be treated with infiltration to extend their service life and improve their water resistance. For EXAMPLE, THE COOLING SYSTEM COMPONENTS OF LARGE COMPUTERS ARE USUALLY MADE OF FRP REINFORCED PLASTICS, which can be effectively sealed by infiltration, thus preventing the leakage of liquids through the fine reinforced fibers as channels.
It can be seen from above that infiltration technology has a wide range of applications in the sealing of mechanical and electrical products and porous material parts.
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