Preparation method of surface modification layer containing iron and aluminum intermetallic compound

A surface modification layer and compound technology, which is applied in metal material coating process, coating, heating inorganic powder coating, etc., can solve the requirements of poor bonding force of modified layer/base, narrow coating thickness range, and preparation environment Advanced problems, to achieve the effect of high preparation efficiency, high efficiency and cost, and low preparation cost

Active Publication Date: 2016-12-21
GUANGDONG UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, the above preparation methods still have the following significant deficiencies: ① complex and expensive equipment, high requirements for the preparation environment, such as high vacuum (physical / chemical vapor deposition); ② complex pretreatment, the surface of the workpiece must meet the requirements of clean surface; ③ high preparation temperature , exceeding the tempering temperature of commonly used structural steel, the coating thickness range is narrow, generally less than 5 μm (physical / chemical vapor deposition); ④The modified layer / base bonding force is poor (thermal spraying), and defects such as multiple cracks and micropores are formed ( Laser cladding), the service effect is not ideal under severe working conditions such as high speed and heavy load

Method used

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  • Preparation method of surface modification layer containing iron and aluminum intermetallic compound
  • Preparation method of surface modification layer containing iron and aluminum intermetallic compound
  • Preparation method of surface modification layer containing iron and aluminum intermetallic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 Preparation of surface modification layer of iron-containing aluminum intermetallic compound

[0028] S1. Add 6gL to kerosene 7 -1 The aluminum powder 6 is continuously stirred for 30 minutes by a small propeller 8, and the aluminum powder is fully dispersed in kerosene to form an aluminum powder / kerosene mixed working fluid;

[0029] S2. Adopt the servo control system 1 of the electric discharge machining machine tool, control the gap between the aluminum powder tool electrode 2 and the ordinary low carbon steel workpiece 3 with a molding pressure of 10MPa to about 200 μm, and start the electric discharge machining pulse power supply 4 at ordinary low Pulse discharge is carried out between the carbon steel and the tool electrode; the pulse discharge parameters are set as follows: pulse width 100μs, peak current 6A, pulse-to-pulse 200μs, discharge time 5min.

[0030] S3. Use the pulse discharge to break down the working fluid, form a high-energy plasma dis...

Embodiment 2

[0037] The difference from Example 1 is that the pulse discharge parameters in step S2 are set as follows: pulse width 50μs, peak current 15A, pulse-to-pulse 20μs, discharge time 30min; The gap between them is controlled to about 200 μm, at this time the modified layer is made of FeAl and Fe 4 Al 13 Main phase, the total content of the two is about 90wt.%, Fe 3 C and Fe are the second phase.

Embodiment 3

[0039] Unlike Example 1, the concentration of aluminum powder added in step S1 is 1gL -1 The forming pressure of the aluminum powder tool electrode in step S2 is 30MPa; the pulse discharge parameters in step S2 are set as follows: pulse width 10μs, peak current 3A, pulse-to-pulse 100μs, discharge time 15min, aluminum powder tool electrode 2 in step S2 The gap between the common low carbon steel workpiece 3 is controlled to about 50 μm.

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Abstract

The invention discloses a surface modification layer containing an iron and aluminum intermetallic compound and a preparation method of the surface modification layer. The preparation method comprises the following steps: taking an aluminum powder pressing body as a tool electrode, taking aluminum powder and coal oil mixed liquid as working liquid, and taking common low-carbon steel as a workpiece; enabling pulse discharge to be generated between the electrode and the workpiece in the working liquid by using a common electric spark machine tool; enabling the electrode, aluminum in the working liquid and iron in the workpiece to carry out in-situ alloying reaction with the aid of discharge energy; and finally, forming the surface modification layer containing the iron and aluminum intermetallic compound on the surface of the workpiece. The modification layer prepared by the method has the advantages of compact structure, good basic binding force and the like, and is expected to be widely used in the field of surface modification for improvement of corrosion resistance and wear resistance of structure materials.

Description

technical field [0001] The invention belongs to the technical field of workpiece surface treatment methods, and more specifically relates to a method for preparing a surface modification layer of an iron-containing aluminum intermetallic compound. Background technique [0002] Iron-aluminum intermetallic compounds (including Fe 3 Al and FeAl) have low cost, low density, significant high temperature vulcanization, oxidation resistance, high hardness and excellent erosion resistance, and are extremely potential high temperature structural materials. However, the industrial application of Fe-Al intermetallic compounds is limited due to their poor toughness at room temperature and difficulty in processing. Using surface treatment technology, a layer of modified layer containing iron-aluminum intermetallic compound is prepared on the structural material, which not only avoids its disadvantages, but also fully exerts its excellent performance. [0003] At present, a variety of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08
CPCC23C24/106
Inventor 麦永津揭晓华连玮琦
Owner GUANGDONG UNIV OF TECH
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