Method for preparing ultrahard erosion-resistant amorphous steel coating

An amorphous steel, erosion-resistant technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of unsatisfactory coating structure and performance, unfavorable amorphous phase, low spraying speed, etc. Achieving good glass forming ability, low porosity and concentrated jet

Inactive Publication Date: 2010-08-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

The most widely used plasma spraying in the existing industry is mainly air plasma spraying. Due to the serious oxidation and low spraying speed i

Method used

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  • Method for preparing ultrahard erosion-resistant amorphous steel coating
  • Method for preparing ultrahard erosion-resistant amorphous steel coating
  • Method for preparing ultrahard erosion-resistant amorphous steel coating

Examples

Experimental program
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Example Embodiment

[0033] Example 1

[0034] Firstly, the master alloy of the alloy is prepared by vacuum induction melting method, the alloy composition is Fe54.2; Cr 18.3; Mo 13.7; Mn 2.0; W 6.0; B 3.3; C 1.1; Si 1.4 (wt.%). Then the master alloy was placed in an ultrasonic gas atomization heating furnace, and the process was optimized to prepare amorphous steel powder. The specific process parameters of gas atomization are: atomization temperature 1400K, atomization pressure 7MPa. The powder particle morphology is shown in Figure 1. It can be seen from the figure that the powder is mostly spherical with a small amount of satellite tissue. The powder has excellent fluidity and filling properties, about 0.25s / g. It is suitable as a precursor powder for thermal spraying. The X-ray diffraction results of the powder are shown in Figure 2. The figure shows that due to the cooling rate during atomization and the limited amorphous forming ability of the material, there is a certain crystalline phase...

Example Embodiment

[0039] Example 2

[0040] The difference from Example 1 is:

[0041] The alloy composition of this embodiment is Fe 59.3; Cr 19.8; Mo 5.5; Mn 2.1; W 6.8; B 3.8; C 1.5; Si 1.2 (wt.%). The plasma thermal spraying process parameters used are: powder feeding amount 90g / min, spraying distance 125mm, spraying current 220A. As a result, the prepared ultra-hard and high erosion-resistant amorphous steel coating has a thickness of 700 microns, increased porosity and oxygen content, an amorphous phase volume content of about 70%, and a microhardness of about 1170HV. The erosion performance is slightly better than that in Example 1, but the corrosion performance is somewhat reduced.

Example Embodiment

[0042] Example 3

[0043] The difference from Example 1 is:

[0044] The alloy composition of this embodiment is Fe 58.4; Cr 17.3; Mo 8.2; Mn 2.6; W 7.8; B 2.3; C 1.8; Si 1.6 (wt.%). The high-speed three-electrode thermal plasma spraying process parameters used are: powder feeding The amount is 90g / min, the spraying distance is 150mm, and the spraying current is 220A. As a result, the prepared ultra-hard high erosion resistance amorphous steel coating has a thickness of 750 microns, a slight increase in porosity and oxygen content, an amorphous phase volume content of about 77%, and a microhardness of about 1050HV. There is no obvious change in performance and erosion resistance.

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Abstract

The invention provides a method for preparing ultrahard erosion-resistant amorphous steel coating, which relates to an amorphous steel alloy with good glass-forming capability and the high strength, high hardness and excellent corrosion resistance and erosion resistance of the amorphous steel alloy, in particular to a preparation method for amorphous steel coating and the potential application fields of the amorphous steel coating. The method is characterized in that: amorphous steel powder is prepared by utilizing the ultrasonic gas atomization technique, the amorphous steel coating is prepared by utilizing high-speed three-electrode plasma spraying, the technique is flexible, the cost is low, and industrialization can be easily implemented. The high-performance amorphous steel coating obtained by the method has properties such as compact structure, low oxygen content, extremely high hardness, high corrosion resistance, excellent erosion resistance and the like, and has a great application prospect in fields such as hard chromium substitution, ships, oil and gas fields, hydraulic facilities and nuclear waste treatment. In addition, the possible application range of the technique is wider, and the technique can provide good concept and method for protective costing preparation and has certain guiding significance.

Description

technical field [0001] The invention relates to an iron-based amorphous alloy (amorphous steel) with good glass forming ability, and in particular provides a technical method suitable for preparing a superhard and highly erosion-resistant amorphous steel coating, and the amorphous steel coating potential applications in many fields. Background technique [0002] Amorphous alloys (also known as metallic glass) are regarded as the third revolution in the development of the material field after "steel" and "plastic". Compared with conventional polycrystalline metal materials, amorphous alloys exhibit structural characteristics of long-range disorder and short-range order, and have many excellent mechanical and physical properties. Amorphous steel is a very important alloy system in the field of metallic glass. It not only has excellent high-strength properties, but also exhibits outstanding performance in corrosion resistance and wear resistance. In addition, its preparation ...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/12C22C45/02C22C33/02C23C4/134
Inventor 刘晓强王建强常新春侯万良张甲
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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