CN100392145C - Method for preparing aluminum-copper-iron quasicrystal coating by vacuum evaporation - Google Patents

Abstract

The invention relates to the technical field of material surface engineering, in particular to a method for preparing an aluminum-copper-iron quasicrystal coating by vacuum evaporation. The preparation process steps are: weighing 65% Al, 20% Cu and 15% Fe aluminum-copper-iron quasicrystalline powder; preparation before plating; vacuuming to 2×10 ^-3 ~5×10 ^-3 Pa; adjustment of process parameters; vacuum evaporation; slow cooling and removal; finished product. Compared with the prior art, the present invention only needs to control the composition ratio of the quasi-crystalline powder for the preparation of the coating, and the adhesion of the coating is good. The metal ion bombarding the surface will produce an injection effect, which is beneficial to improve the adhesion of the coating, and the structure of the coating is uniform. , dense, which is conducive to the popularization and application of the coating. After the quasicrystalline powder is vacuum evaporated, an aluminum-copper-iron quasicrystalline coating is still formed on the surface of the sample. The obtained quasicrystalline coating has high hardness and low friction coefficient. It has good wear resistance and high temperature oxidation resistance.

Description

Method for preparing aluminum-copper-iron quasicrystal coating by vacuum evaporation

[technical field]

The invention relates to the technical field of material surface engineering, in particular to a method for preparing an aluminum-copper-iron quasicrystal coating by vacuum evaporation.

[Background technique]

Quasicrystalline materials were developed rapidly in the middle and late 1980s. They are new materials with many excellent properties, such as high hardness, low surface energy, extremely low coefficient of friction, excellent heat resistance and corrosion resistance, and excellent optical and electromagnetic properties. Therefore, the ceramic-like properties of quasi-crystalline materials have attracted extensive attention of coating technology workers. Due to the high brittleness of quasicrystal materials, the potential application fields of quasicrystal materials are greatly limited. Therefore, the engineering application research of quasicrystalline materials is currently mainly concentrated in two aspects of surface coating and composite materials.

From the perspective of overall development and research results, the formation of quasicrystalline coatings is generally considered to have two processes: the first step is the solid-state diffusion process; the second step is the purification process of the quasicrystalline phase. The preparation methods of quasicrystalline coatings are mainly divided into two categories: physical vapor deposition (PVD) and thermal spraying methods. Physical vapor deposition methods include vacuum evaporation, sputtering deposition, laser fusion synthesis, ion beam mixing, etc.

Vacuum evaporation is to sublimate metal or compound into gaseous state in vacuum, then deposit on the surface of substrate, and obtain quasi-crystalline coating after annealing. The disadvantage of the vacuum evaporation method currently used is that the composition of the coating is quite different from that of the base material.

[Content of the invention]

The purpose of the present invention is to overcome the deficiencies of the prior art, adopt a vacuum coating machine, use refractory metal molybdenum as a heating evaporation vessel, use aluminum-copper-iron quasicrystal powder directly as the alloy to be plated and evaporate in a vacuum to form a coating , a method for preparing aluminum-copper-iron quasicrystal coatings by vacuum evaporation to obtain quasicrystal coatings through a series of process parameter adjustments.

In order to achieve the above object, design a kind of method that vacuum evaporation prepares aluminum-copper-iron quasicrystal coating, and this preparation process step is: (1) take by weight 65%Al, 20%Cu and 15%Fe Aluminum-copper-iron quasicrystal powder; (2) Preparation before plating; (3) Vacuuming to 2×10 ^-3 ~ 5×10 ^-3 Pa; (4) Adjusting process parameters; (5) Vacuum evaporation; ( 6) slowly cooling and taking out; (7) finished product. The preparation before plating includes sanding, polishing and ultrasonic cleaning of the sample. The adjustment process parameters include adjusting the evaporation distance to 13 cm, the evaporation current to 340 amperes, and the evaporation voltage to 5 volts. The vacuum evaporation uses refractory metal molybdenum as a heated evaporation vessel, and the quasicrystal powder is directly used as an alloy to be plated and evaporated in a vacuum to form a coating. The aluminum-copper-iron quasi-crystal coating prepared by the method can be applied to the fields of machinery, automobile, petrochemical, electric power, chemical industry and aviation.

Compared with the prior art, the present invention only needs to control the composition ratio of the quasi-crystal powder in the preparation of the coating, and the adhesion performance of the coating is better, and various metal ions bombard the surface to produce an injection effect, which is beneficial to improve the adhesion of the coating. The coating structure is uniform and dense, which is conducive to the popularization and application of the coating. After the quasicrystalline powder is vacuum evaporated, an aluminum-copper-iron quasicrystalline coating is still formed on the surface of the sample. The obtained quasicrystalline coating has high hardness and friction resistance. Low coefficient, good wear resistance and high temperature oxidation resistance.

[Description of drawings]

Fig. 1 is a process flow diagram of the present invention.

See attached drawing 1, 1 is quasi-crystalline powder weighing 65% Al, 20% Cu and 15% Fe by mass percentage; 2 is preparation before plating; 3 is vacuuming to reach 2×10 ^-3 ~ 5×10 ^-3 Pa; 4 is for adjusting process parameters; 5 is for vacuum evaporation; 6 is for slow cooling and removal; 7 is for finished product

[Detailed ways]

The present invention will be further described below, and the present invention is relatively clear to those skilled in the art.

Weigh 50 g of aluminum-copper-iron quasicrystal powder with mass percent of 65% Al, 20% Cu and 15% Fe.

Preparation before plating: smooth the sample to be plated with sandpaper, then polish the sample, and finally perform ultrasonic cleaning.

Put the above sample into the position where the sample is placed in the vacuum evaporation chamber of the vacuum coating machine, and put the weighed 50g aluminum-copper-iron quasicrystal powder into the evaporation vessel heated by refractory metal molybdenum, and then seal the vacuum Evaporation chamber, after vacuuming the vacuum evaporation chamber to 2×10 ^-3 ~ 5×10 ^-3 Pa, adjust various process parameters to make the evaporation distance to 13 cm, the evaporation current to 340 amperes and the evaporation voltage to 5 V, start vacuum evaporation, after evaporation for 20 minutes, slowly cool and take out the sample to obtain the quasicrystalline coating. The hardness of the aluminum-copper-iron quasicrystal coating prepared by this process can reach more than 7.6GPa, and the elastic modulus can reach 219.5GPa. The corrosion resistance of the coating in 10% nitric acid solution is nearly 10 times higher. Oxidation at a constant temperature of 400 ° C for 1 hour, the oxidation weight gain of the coating is only one-fifth of that of the non-coating, indicating that its oxidation resistance is 5 times higher than that of the non-coating.

Claims (5)

1. a vacuum evaporation prepares the method for aluminium-copper-ferrum quasi-crystal coating, the preparation that it is characterized in that coating is with the evaporator boat of refractory metal molybdenum as heating, the aluminium-copper-ferrum quasi-crystal powder is directly formed coating as treating alloy plating and evaporating in a vacuum, and processing step is: (1) takes by weighing the aluminium-copper-ferrum quasi-crystal powder that mass percent is 65%Al, 20%Cu and 15%Fe; (2) prepare before the plating; (3) vacuumize and reach 2 * 10 ^-3～5 * 10 ^-3Pa; (4) vacuum evaporation; (5) slow cooling is taken out; (6) finished product.

2. a kind of vacuum evaporation as claimed in claim 1 prepares the method for aluminium-copper-ferrum quasi-crystal coating, it is characterized in that: be prepared as sample sand papering, polishing and ultrasonic cleaning before the described plating.

3. a kind of vacuum evaporation as claimed in claim 1 prepares the method for aluminium-copper-ferrum quasi-crystal coating, it is characterized in that: the technical parameter of described vacuum evaporation is that 13 centimetres, evaporation current are that 340 amperes, vaporization voltage are 5 volts for regulating the evaporation distance.

4. a kind of vacuum evaporation as claimed in claim 1 prepares the method for aluminium-copper-ferrum quasi-crystal coating, it is characterized in that: described vacuum evaporation is with the evaporator boat of refractory metal molybdenum as heating, and accurate crystalline flour end is directly formed coating as treating alloy plating and evaporating in a vacuum.

5. a kind of vacuum evaporation as claimed in claim 1 prepares the method for aluminium-copper-ferrum quasi-crystal coating, it is characterized in that: the aluminium-copper-ferrum quasi-crystal coating of this method preparation can be applicable to machinery, automobile, petrochemical industry, electric power, chemical industry, aviation field.

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