The chemical constituents of the pvd vacuum coating machine

The chemical constituents of the pvd vacuum coating machine
1. The thickness uniformity, which can also be interpreted as roughness, watching it on the scale of the optical thin film is 1/10 of a wavelength as a unit, is about 100 a, vacuum coating uniformity is good, easy to control the roughness 1/10 of the visible light wavelength range, that is for the optical properties of thin film, vacuum coating without any obstacles.But if it is refers to the uniformity of atomic scale layer, that is to achieve 10 a 1 a smooth, even under the specific control factors according to different coating gives a detailed explanation.
2. The uniformity chemically: that is to say in the film, compound atomic elements will be because of the scale is too small and it is easy to produce non-uniform features, SiTiO3 film, if the coating process is not scientific, so on the surface of the component is not actual SiTiO3, and may be in proportion to the other, the plating film is not want the chemical composition of the membrane, it is also the technical content of vacuum coating.The specific factors are given below.
3. The uniformity of the lattice degree of order: this determines the film is a single crystal, polycrystalline, amorphous, is the hot issue in the vacuum coating technology

Vacuum coating machine uneven deposition

Vacuum coating machine uneven deposition
With the development of coating technology, all kinds of vacuum coating machine also gradually appear, either vacuum coating machine, the uniformity of the film will be influenced by some factors. Now, we will by magnetic sputtering vacuum coating machine for the analysis of film forming uneven factor.
Uneven coating machine extraction can affect coating uniformity. Substrate clean is very important. Before making vacuum coating to the substrate surface is clean, achieve the workpiece to the purpose of the oil, decontamination and dehydration. Substrate surface contamination from parts in processing, transportation, etc in the process of all kinds of dirt, grease, polishing paste, perspiration, etc., in damp environment, easy oxidation of substrate surface, the formation of oxide film adsorbed gas. For these dirt, can use to clean oil or chemical methods. Clean substrate don't directly on the outside, the need to use a closed container storage, reduce contamination. Coating deposited indoor is, so to clean coating indoor, baking degassing, and place the machine in a clean environment. Pay attention to the diffusion pump oil. Coating raw materials are many, such as resin, silicone, silicone hydrochloric acid, polymer and so on, auxiliary materials, formulation is different than the column, thin film is also different.
Above is the vacuum coating machine film-forming uneven factor.

Vacuum coating technology advantage in where?

                Vacuum coating technology advantage in where?

Vacuum coating technology advantage in where? Vacuum coating technology of the most widely used in plastic products, vacuum coating factory said the plastic is easy molding, low cost, light weight, no corrosion and other characteristics, widely used plastic products, but because of its disadvantages restricted the expanded application. Through the application of vacuum coating technology, plastic surface metallization, combine organic materials and inorganic materials, greatly improved its physical and chemical properties. Vacuum coating technology advantage is mainly embodied in the following aspects:
1, make plastic surface conductivity;
2, easy to clean, no dust.
3, improve beautiful, smooth surface, the metallic color, adornment sex is greatly improved;
4, reduce water absorption, the larger the number of coating, the less pinhole, bibulous rate is lower, the product is not easy to deformation, improve the heat resistance;
5, improve surface hardness, the original plastic surface than metal soft and vulnerable, through vacuum coating technology, hardness and wear resistance increase greatly;
6, can improve the weatherability, general plastic outside can aging fast, the main reason is caused by ultraviolet irradiation, and after plating aluminum, aluminum with ultraviolet the strongest reflection, so the weather is greatly increased.

Progress in Surface Modification Technology

   

 With the development of scientific and technological progress and the edge of science and technology areas covered surface modification technology "vacuum c​oating" continues to extend and expand. Traditional carburizing, nitriding and other chemical treatment technology has become a fundamental part of surface modification technologies; ion implantation technology, laser and electron beam technology in surface modification of materials, for parts of the surface hardening and surface alloying offers new technology and methods.

(1) Salt Nitrocarburizing technology (TUFFTRIDE QPQ). TUFFTRIDE QPQ process is the part after a simple pre-washed and pre-heated to the air after 350 ~ 400 ℃, the alkali cyanate tank for Nitrocarburizing usually treatment temperature is 580 ℃, maintain 60 ~ 120min, special when the case can be reduced or elevated temperatures. Cold treatment using an oxidation at the cooling tank, at a temperature range of 350 ~ 400 ℃ cooling, followed by hot water jet cleaning of the workpiece. In addition to cooling slowly cooling oxidation, good for dimensionally stable parts, but also has the following advantages:

① significantly improved the corrosion resistance of parts;

② parts of the surface in the base product to produce cyanate tank oxide film;

③ better sliding properties.

(2) ion nitriding "multi-arc ion vacuum coating"gas phase analysis and application. In the plasma nitriding process, in addition to temperature and time, furnace gas composition is an important factor in determining the quality of the nitrided layer. Element N, H ratio changes significantly affect the structure of the compound, and the influence of hardness of the diffusion layer to some extent. In addition, the ion nitrocarburizing process, the compound layer is a dense, e single-phase layer can form, furnace gas composition is a decisive factor. Typically by controlling the furnace atmosphere into the nitriding furnace gas flow rate is set, but the actual flow rates at different points of the same partial pressure of the gas is often quite different, resulting in factors such differences are: from gas means a chemical reaction to occur at gas path characteristic nitriding furnace, the speed of change and the like inflatable gas ions between different conditions and the like.

Technical requirements UV lamp vacuum coating paint

Vacuum coating due to radiation-curable coatings green and high efficiency, makes the technology in the world gained widespread attention and rapid growth, its applications more widely. UV coating layer having excellent surface smoothness, is suitable as a primer for the vacuum metal coating technology, available very bright metal appearance on the plastic substrate.

With the development of the automobile industry, many metal replacement technology has been applied, the current car headlight reflector applications, has been fully adopted in the PC, BMC and other plastic surface by vacuum metallized to increase the reflection effect for this area the UV coating requires a good leveling, high temperature resistance (for PC substrates require more than 120 ℃, BMC substrates up to 180 ℃)....

In the design of PC reflector headlights when using UV primer, pay attention to increase the crosslink density coating the coating to ensure a good closure, by adjusting the ratio of reactive diluent formulations to the coating and the substrate, adhesion between the coating and the coating to achieve the best, the complex structure of the workpiece, pay special attention to ensure that the site is not sufficient UV radiation can be completely cured. The main reason for the vacuum coating UV primer requirements before vacuum coating to a plastic substrate surface UV coating has the following two points:

First, when the base is closed by UV coating, vacuum coating, or prevent the use of the escape of volatile impurities in the substrate workpiece, affect coating quality. Like when the lamp reflector applications, due to the use of the process temperature rises above 100 ℃, if volatile impurities in the substrate will release the aluminum layer hair color, color, affect the reflection effect. Figure 1 (omitted) for the DSC curve PC plastic, this figure shows the PC when the substrate has a temperature of about 90 ℃ significant heat flux, may be considered material to release a glass transition temperature Tg of about 140 ℃, the material use temperature should be below this temperature.

Second, to improve the flatness of the substrate surface, ensure the coating mirror effect. Generally plastic surface roughness 0.51nn around itself, vacuum coating thickness does not exceed 0.2μm, was unable to fill the uneven surface of the substrate, are not ideal mirror effect, UV coating thickness of 10-20μm, surface flatness 0.1μm or less, you can fill the substrate coating defects and get the desired effect. For PC material headlight reflector of UV coating must have the following basic characteristics:

(1) leveling state is good, bright paint film, so you can make sure that there is a complete vacuum coating of reflective film.

(2) coating with seal action, ensures the escape of PC substrate does not affect the coating composition at 120 ℃ time.

(3) the coating itself has a certain heat resistance, 120 ℃ will not have material effect on the decomposition release coating.

PVD plating method before plating surface purification treatment

         

The basic method before plating PVD plated surface cleaning solvent purification treatment is a relatively common method of application. In this method, the cleaning fluid often has:

(1) demineralized water or aqueous systems, such as those containing detergent in water, acid or alkali;

(2) an anhydrous organic solvent, such as ethanol, isopropanol, ketones, such as acetone;

(3) petroleum fractions, chlorinated or fluorinated hydrocarbons;

(4) emulsions or solvent vapors;

(5) metal cleaning agent (commercially available). Gold metal cleaning agent can be divided into acidic, basic and neutral to slightly alkaline three,

its use are: acidic oxide used for cleaning, rust and corrosion; alkaline surfactant-containing, for removing lightweight oil; neutral to slightly alkaline pH of the surface to avoid damage.

Choice of which depends on the nature of a cleaning solvent contamination. For example, the plating solution available base oils chemical plants and animals on the surface to the oil; mineral oils can be used to remove the organic solvent. Various types of oil but in fact often exist, so when washing has often need to take several different cleaning solvents.

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DLC vacuum coating can improve adhesion film

         

DLC coating to improve the instantaneous energy and the sputter target bombardment ionization rate (up to 50% to 60%), close to the ionization rate of the arc. DLC coating by the action of an electromagnetic field can greatly increase the energy of the ion deposition, DLC coatings to improve film adhesion and density.
 
DLC coating to improve the quality bombardment cleaning, in particular, can realize the non-conductive plating before cleaning, assisted deposition coating, increasing the energy deposition particles, improve adhesion film. DLC coating nano-deposition technology, DLC coating is the future direction of the coating structure, DLC coatings deposited layers of different components of the composite structure of the film thickness by nanoscale to achieve greatly enhanced coating performance.

DLC coated single color PVD coating has failed to meet the needs of the market, and then put between color plating requirements, which is the development direction of decorative coatings, plating color quality between a representative of PVD processing enterprise production technology level mark. DLC coatings reduce ignition of the workpiece, increasing ion energy deposition, enhanced adhesion strength, improve the deposition rate.

DLC coating by low temperature condensation effects, rapid trapping residual gas in the vacuum within the system, in particular water vapor, greatly reducing the time to vacuum, to obtain a clean vacuum environment. DLC coating green, greatly reducing energy consumption, the vacuum system pumping speed stability, coating process is stable and reliable, and reproducible.

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