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Low-oxygen-content and high-yield spherical aluminum bronze alloy powder for thermal spraying and preparation method thereof

A technology of alloy powder and bronze alloy, which is applied in the field of aluminum bronze coating materials and coating preparation, can solve the problems of low fluidity and loose ratio, high coating porosity, and low powder performance, and achieve fluidity and loose ratio High, low oxide content, good sphericity effect

Inactive Publication Date: 2011-08-24
BGRIMM ADVANCED MATERIALS SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with similar foreign products, there are mainly the following gaps: a) The prepared alloy powder is mostly ellipsoidal, with poor sphericity, low fluidity and loose ratio, which is not conducive to the spraying of mixed powder, and often leads to poor distribution of coating components. Uniformity and other problems; b) The powder performance is low, and the content of oxygen and impurities in the powder is high. At present, the oxygen content of the aluminum bronze coarse powder developed in China is generally above 800ppm, and the fine powder is above 1000ppm (the oxygen content in foreign countries is less than 400ppm). It hinders the metallurgical bonding between the powders during the spraying process, resulting in high porosity of the coating; c) the prepared aluminum bronze coating has a low bonding strength; d) the yield of primary powder is low, and the current domestic powder production method adopts aerosol air cooling method The primary powder recovery rate of the process is about 40%

Method used

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  • Low-oxygen-content and high-yield spherical aluminum bronze alloy powder for thermal spraying and preparation method thereof
  • Low-oxygen-content and high-yield spherical aluminum bronze alloy powder for thermal spraying and preparation method thereof
  • Low-oxygen-content and high-yield spherical aluminum bronze alloy powder for thermal spraying and preparation method thereof

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preparation example Construction

[0025] 1. Preparation of Alloy Powder

[0026] The preparation method of aluminum bronze coating material of the present invention comprises the following steps:

[0027] 1) Take metal material a): aluminum: 1-20wt%, iron: 0-5wt%, copper: balance; or take metal material b): aluminum: 1-20wt%, iron: 0-5wt%, copper The balance of aluminum-iron-copper alloy;

[0028] 2) Put the selected raw materials into a vacuum melting crucible; obtain aluminum bronze alloy powder through vacuum induction melting and inert gas atomization technology; the heating method and atmosphere control system are as follows: figure 2 shown;

[0029] 3) Sieving or grading to prepare aluminum bronze coating materials with a powder particle size in the range of 25-124 μm. image 3 and Figure 4 It is the 200 times and 2000 times magnified photos of the scanning electron microscope SEM of the aluminum bronze prepared by the present invention. It can be seen that the particle size of the aluminum bronze ...

Embodiment 1

[0035] Metal materials: aluminum: 12wt%, iron: 3wt%, copper: balance. Put it into the vacuum atomization equipment and use intermediate frequency induction heating. When the temperature is heated to 1150°C, keep it warm for 10-20 minutes. After the alloy liquid is homogenized, use nitrogen atomization. The atomization process parameters are: atomization pressure is 1.8 MPa, the atomizer angle is 60°, and the aluminum bronze alloy powder is obtained.

[0036] The particle size of silver-copper alloy powder of the coating material prepared by classifying is in the range of 45-124 μm. Thus, the coating material aluminum bronze alloy powder is prepared. Atmospheric plasma spraying is used to spray aluminum bronze alloy powder. The spraying process parameters are: arc current 550A; arc voltage 65V; argon pressure 2.80MPa; hydrogen flow rate 0.36L / min; powder feeding speed 60g / min; spraying distance 140mm.

[0037] The prepared coating is dense, uniform and continuous, the powder ...

Embodiment 2

[0039] Alloy composition aluminum: 10wt%, iron: 2wt%, copper: balance. Put it into the vacuum atomization equipment and use intermediate frequency induction heating. When the temperature is heated to 1150°C, keep it warm for 10 to 20 minutes. After the alloy liquid is homogenized, use argon to atomize. The atomization process parameters are: atomization pressure is 1.5MPa, the atomizer angle is 75° to obtain aluminum bronze alloy powder.

[0040] The particle size of silver-copper alloy powder of the coating material prepared by classifying is in the range of 25-124 μm. Thus, the coating material aluminum bronze alloy powder is prepared. Atmospheric plasma spraying is used to spray aluminum bronze alloy powder. The spraying process parameters are: arc current 550A; arc voltage 65V; argon pressure 2.80MPa; hydrogen flow rate 0.36L / min; powder feeding speed 60g / min; spraying distance 140mm.

[0041] The prepared coating is dense, uniform and continuous, the powder is in a good...

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Abstract

The invention relates to a low-oxygen-content and high-yield spherical aluminum bronze alloy powder for thermal spraying and a preparation method thereof. A vacuum melting-inert gas atomization method is used for preparing the aluminum bronze alloy powder. The aluminum bronze alloy powder comprises the following components: 1-20wt% of aluminum, 0-5wt% of iron, less than or equal to 120ppm of oxygen and the balance of copper. The granularity is 25-124mu m, the main body is in the range of 25-45mu m, and the one-time powder yield in the range of 25-124mu m is greater than or equal to 75%. A soft support wear-resistant coating prepared by adopting the powder has the characteristics that the hardness HR15T is greater than or equal to 89, the bonding strength is greater than or equal to 35MPa, the oxide content is 0.8-1.5wt%, and the porosity is 8-11%. The invention solves the technical problems of poor powder sphericity, low one-time powder yield, unqualified oxide content and hardness in the coating and the like. The powder can be used as a raw material for preparing a soft wear-resistant coating material and a copper-aluminum / nickel-graphite sealing coating material. Compared with the traditional aluminum bronze alloy powder, the powder provided by the invention has the advantages that the thermal spraying process adaptability of the powder and the performance of the coating are better, and the oxide content is lower.

Description

technical field [0001] The invention relates to a coating material. In particular, it relates to an aluminum bronze coating material and coating preparation technology with simple preparation process, easy control of the coating process, stable spraying quality and low comprehensive preparation cost. Background technique [0002] Due to its excellent physical properties, wear resistance and corrosion resistance, aluminum bronze alloy powder has been widely used in many fields such as electronics, machinery, chemical industry, national defense, etc., for example, petroleum refining equipment, water conservancy and hydropower industry, shipbuilding industry, aerospace Metal surface protection and anti-abrasion parts in the nautical industry and other fields play an important role in the development of national economy and science and technology. Especially in recent years, with the rapid development of surface technology, aluminum bronze alloy powder has been widely used and ...

Claims

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Application Information

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IPC IPC(8): C23C4/08B22F9/08
Inventor 任先京张淑婷于军杨永琦王辉马尧章德铭肖宁许根国
Owner BGRIMM ADVANCED MATERIALS SCI & TECH
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