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Fe3Al/Cr7C3 powder and preparation method thereof and corresponding coating

A powder and coating technology, applied in the direction of coating, pressure inorganic powder coating, metal material coating process, etc., can solve the problems of uneven composition and high cost, achieve uniform and dense structure, reduce wear effect, and reduce possibility Effect

Inactive Publication Date: 2019-07-09
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some studies have used conventional composite powder preparation methods (such as adhesive agglomeration) to prepare Ni 3 Al-Cr 3 C 2 Powder, but there are disadvantages of uneven composition and high cost

Method used

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  • Fe3Al/Cr7C3 powder and preparation method thereof and corresponding coating
  • Fe3Al/Cr7C3 powder and preparation method thereof and corresponding coating
  • Fe3Al/Cr7C3 powder and preparation method thereof and corresponding coating

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preparation example Construction

[0025] Specifically, the composite Fe provided by the present invention 3 Al / Cr 7 C 3 The preparation method of powder may comprise the following steps:

[0026] Step A. Heat and melt the raw materials in a crucible. The temperature of the molten pool is measured by a "platinum rhodium 30-platinum rhodium 6" thermocouple, the vacuum degree is 25-40Pa, the melting time is 90-120min, and the melting temperature is kept at 1873K-2073K. Ar gas protection was used during the melting process.

[0027] Step B. Guide the liquid metal in the crucible of the gas atomization tower to flow out from the bottom guide tube of the crucible and enter the atomization chamber. The high-pressure and high-speed atomization gas Ar gas is used to impact the molten alloy liquid flow through the atomization nozzle, and the liquid flow is mist It turns into dispersed fine liquid particles, the atomization temperature is 1960-1965K, the nozzle diameter is 3-10mm, and the gas pressure is 3.3-3.5MPa. A...

Embodiment 1

[0039] A composite Fe 3 Al / Cr7C3 powder and coating, its preparation method can comprise the following steps:

[0040] Step A, according to the feed ratio: Al: 13.60wt%; Cr: 18.33wt%; C: 1.35; B: 0.2wt%; Fe: balance, calculate iron, chromium, high-carbon ferrochrome, aluminum, ferroboron Wait for the amount of raw materials to be fed, and put the raw materials into the crucible.

[0041] Step B. Seal the gas atomization equipment, vacuumize it, protect it with Ar gas during the melting process, and control the vacuum degree to 30Pa. The raw materials are heated and melted in the crucible, the thermocouple measures the temperature of the molten pool in real time, the melting temperature is kept at 1900K-2060K, and the melting time is 90 minutes.

[0042] Step C, guide the liquid metal in the crucible of the gas atomization tower to flow out from the bottom guide tube of the crucible, enter the atomization chamber, use high-pressure and high-speed atomization gas Ar gas to imp...

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Abstract

The invention discloses Fe3Al / Cr7C3 powder and a preparation method thereof and a corresponding coating, and belongs to the technical field of a medium and high temperature wear-resistant special coating material. Metal / ceramic composite powder with in situ synthesized Cr7C3 as a strengthening phase is prepared by a vacuum atomization process with inert gas protection, the in-situ generation of intermetallic compound bonding phase Fe3Al and ceramic reinforced phase Cr7C3 is realized, the ceramic phase is dispersedly distributed, the interface components of a ceramic hard phase and the bondingphase are naturally transited, and the combination is compact. An intermetallic compound-based metal-ceramic coasting with a basically-unchanged phase structure which is prepared by a thermal sprayingprocess with the powder as a raw material has the structural characters of controllable volume fraction of the ceramic hard phase and good dispersity. The coating has the advantages of high high-temperature hardness, good abrasive resistance, wide range of application and low cost.

Description

technical field [0001] The invention belongs to the technical field of medium and high temperature wear-resistant special coating materials, and relates to a 3 Al intermetallic compound as binder phase, carbide Cr 7 C 3 In-situ self-generated cermet powder, its preparation method and corresponding coating. Background technique [0002] Cermet wear-resistant coating is one of the main measures adopted for the wear protection of metal parts. At present, the wear-resistant coating materials of industrial parts are mainly cermets strengthened by chromium carbide or tungsten carbide hard phase. Such materials are used as protective coatings for high-temperature transmission friction parts when they are worn against specific friction pairs under continuous high-temperature boundary lubrication conditions. , often cannot meet the requirements of use under severe and complex working conditions. It is necessary to overcome defects on the basis of existing material systems, give pl...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/08C22C38/06C22C38/32C23C24/10C23C4/12C23C4/06C23C24/04
CPCB22F1/0003B22F9/082C22C38/06C22C38/32C23C4/06C23C4/12C23C24/04C23C24/103
Inventor 于月光袁建鹏沈婕衣晓红王玉高峰马尧张鑫
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD