Powder embedding calorizing agent and embedding caloriation method

A technology of powder embedding and aluminizing agent, which is used in metal material coating process, coating, solid diffusion coating and other directions, can solve the problem of excessive amount of iron and aluminum powder, difficult to control the aluminum content on the surface of the aluminized layer, unsatisfactory, etc. problem, to achieve the effect of simple process, easy industrialization and easy operation

Inactive Publication Date: 2003-06-25
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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] Aluminizing agent composition (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 fully mixing the infiltrating agent evenly, put it together with the sample in an infiltrating tank made of seamless stainless steel pipe welding and seal it, and carry out aluminizing treatment in a 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 aluminized layer of 20 steel after the above treatment is mainly FeAl phase, wherein the aluminum content is 50%at.

Embodiment 2

[0024] Aluminizing agent composition:

[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 fully mixing the infiltrating agent evenly, put it together with the sample in an infiltrating tank made of seamless stainless steel pipe welding and seal it, and carry out aluminizing treatment in a 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 Al phase, wherein the aluminum content is 25%at.

Embodiment 3

[0029] Aluminizing agent composition (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 fully mixing the infiltrating agent evenly, put it together with the sample in an infiltrating tank made of seamless stainless steel pipe welding and seal it, and carry out aluminizing treatment in a 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, wherein 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 embedding aluminizing method, in particular to an aluminizing agent and a method for embedding aluminizing by using the aluminizing agent. Background technique [0002] Powder embedded aluminizing of metals such as steel or iron is a process widely used in 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 brittleness of the aluminized layer will be high, and the aluminized layer will be easily peeled off during use; if the aluminum content of the aluminized layer is too low, the high temperature corrosion resistance will decrease not good. None of them can meet the requirements for use, so the aluminum content of the aluminized layer should be controlled within an appropriate range. [0003] The amount of aluminum on the su...

Claims

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Application Information

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Patent Type & Authority Applications(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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