Powder embedding calorizing agent and embedding caloriation method

A technology of powder embedding and aluminizing agent, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., and can solve the problem of excessive consumption of iron and aluminum powder, difficulty in controlling and unsatisfactory aluminum content on the surface of aluminized layer, etc. problem, to achieve the effect of simple process, convenient industrial implementation and easy operation

Inactive Publication Date: 2005-06-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The solid powder embedding aluminizing method using iron-aluminum powder as the aluminum supply agent overcomes the problem that the aluminizing agent is bonded to the surface of the workpiece, but the amount of iron-aluminum powder in the aluminizing agent is large, which increases the cost of aluminizing, and The aluminum content on the surface of the aluminized layer is not easy to control
[0004] All in all, the current method of embedding aluminizing is difficult to control the aluminum content on the surface of the infiltrating layer, which cannot meet the needs of relevant departments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Composition of aluminizing agent (weight):

[0020] 10% aluminum powder (Al, 180 mesh), 5% iron powder (Fe, 220 mesh), 2% ammonium chloride (NH 4 Cl), 83% alumina (Al 2 O 3 , 180 mesh);

[0021] Treatment process: After thoroughly mixing the infiltrant evenly, it is sealed with the sample in an infiltrating tank made of seamless stainless steel pipe welding, and then aluminized in the SX2-2.5-12 box-type electric furnace. First heat to 780°C for 2 hours, then heat to 1000°C for 6 hours.

[0022] Treatment result: The surface composition of the 20 steel aluminized layer after the above treatment is mainly FeAl phase, in which the aluminum content is 50% at.

Embodiment 2

[0024] Composition of aluminizing agent:

[0025] 2% aluminum powder (Al, 180 mesh), 10% iron powder (Fe, 220 mesh), 2.5% ammonium chloride (NH 4 Cl), 85.5% alumina (Al 2 O 3 , 180 mesh).

[0026] Treatment process: After thoroughly mixing the infiltrant evenly, it is sealed with the sample in an infiltrating tank made of seamless stainless steel pipe welding, and then aluminized in the SX2-2.5-12 box-type electric furnace. First heat to 780°C for 2 hours, then heat to 1020°C for 8 hours.

[0027] Treatment result: The surface composition of the aluminized layer of 20 steel after the above treatment is mainly Fe 3 In the Al phase, the aluminum content is 25% at.

Embodiment 3

[0029] Composition of aluminizing agent (weight):

[0030] 8% aluminum powder (Al, 180 mesh), 4% iron powder (Fe, 220 mesh), 2% ammonium chloride (NH4Cl), 86% alumina (Al2O3, 180 mesh);

[0031] Treatment process: After thoroughly mixing the infiltrant evenly, it is sealed with the sample in an infiltrating tank made of seamless stainless steel pipe welding, and then aluminized in the SX2-2.5-12 box-type electric furnace. First heat to 780°C for 3 hours, then heat to 1000°C for 4 hours.

[0032] Treatment result: The surface composition of the aluminized layer of HK40 steel after the above treatment is mainly NiAl phase, and the aluminum content is 50% at.

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Abstract

The present invention relates to powder embedding calorizing agent and embedding calorization process. The powder embedding calorizing agent is composite comprising aluminium powder 2-10 wt%, iron powder 5-10 wt%, ammonium chloride 0.5-2.5 wt% and alumina 82-86 wt%. The embedding caloriation process includes the following steps: setting well mixed calorizing agent and iron or steel part to be calorized inside sealed tank, heating to 650-1100 deg.c and maintaining for 2-8 hr. measurement results shows that the treated surface is mainly FeAl phase and Fe3Al phase with aluminium content of 23-50at%. The present invention can result in high calorization quality, and can control the aluminum content on the surface of calorized layer.

Description

Technical field [0001] The invention relates to an embedded aluminizing method, in particular to an aluminizing agent and a method for embedding aluminizing using the aluminizing agent. Background technique [0002] Powder embedding aluminizing of metals, such as steel or iron, is a widely used process in the industry at present, and has the advantages of simple equipment and low cost. However, the aluminum content on the surface of the aluminized coating is not easy to control. If the aluminum content on the surface of the aluminized layer is too high, the layer will be brittle, and the aluminized layer will easily peel off during use; if the aluminum content of the aluminized layer is too low, the high temperature corrosion resistance not good. The aluminum content of the aluminized layer should be controlled within an appropriate range. [0003] The level of aluminum content on the surface of the aluminized layer is related to the composition of the infiltration agent and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/48
Inventor 黄志荣徐宏李培宁
Owner EAST CHINA UNIV OF SCI & TECH
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