Manufacturing method for high-purity iron-chromium-aluminum alloy powder

An iron-chromium-aluminum alloy and manufacturing method technology, applied in metal processing equipment, transportation and packaging, additive processing, etc., can solve problems such as creep deformation, poor plasticity and toughness, and brittle fracture of heating elements, etc., and achieve reduction Effects of inclusions, uniform resistivity, and prevention of powder oxidation

Active Publication Date: 2019-08-16
JIANGSU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are three major defects in smelting and processing Fe-Cr-Al alloys: (1) Low high-temperature strength, prone to creep deformation; (2) High brittleness, poor plasticity and toughness, which is not conducive to processing; (3) After high-temperature use , the grain grows and becomes brittle, the higher the temperature, the longer the time, the more serious the embrittlement after cooling, and the brittle fracture of the heating element will be caused by the abnormal coarse grain
[0007] Since there is almost no research and development on the preparation of iron-chromium-aluminum alloy powders for electrothermal alloys in China at present, it is urgent to explore a preparation process for iron-chromium-aluminum alloy powders for electrothermal alloys

Method used

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  • Manufacturing method for high-purity iron-chromium-aluminum alloy powder
  • Manufacturing method for high-purity iron-chromium-aluminum alloy powder
  • Manufacturing method for high-purity iron-chromium-aluminum alloy powder

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Embodiment approach 1

[0032] This embodiment provides a method for manufacturing high-purity iron-chromium-aluminum alloy powder, including the following steps:

[0033] S1: Raw material preparation: Alloy ingredients are composed of the following components by weight percentage: Ti: 0.11%, Al: 5.9%, Cr: 22%, Co: 0.015%, Zr: 0.16%, Y: 0.5%, Fe is the balance , The total weight of ingredients is 640kg. Prepare fused magnesia sand crucible or fused magnesia spinel crucible; (the furnace before smelting is a nickel-based superalloy, considering the residual components of the crucible, so no nickel strips are added) 150*1100 precision seamless steel pipes are used as 4 mold pipes , 1 chute, and 3 diverter plates; metal raw materials must be clean, dry, and rust-free. New crucibles or crucibles must be carefully baked after repairing, otherwise they cannot be used.

[0034] : Preheat the steel ingot assembly mold to 530°C, keep it warm for 3 hours, hang it in the furnace while it is hot, align it with ...

Embodiment approach 2

[0059] This embodiment provides a method for manufacturing high-purity iron-chromium-aluminum alloy powder that is exactly the same as Embodiment 1, which will not be described in detail here. The only difference is that the alloy ingredients in this embodiment are composed of the following components in weight percentage: Ti: 0.11%, Al: 5.9%, Cr: 22%, Co: 0.015%, Zr: 0.16%, Y: 0.5%, Fe is the balance, and the total weight of ingredients is 420kg.

Embodiment approach 3

[0061] This embodiment provides a method for manufacturing high-purity iron-chromium-aluminum alloy powder that is exactly the same as Embodiment 1, which will not be described in detail here. The only difference is that the alloy ingredients in this embodiment are composed of the following components in weight percentage: Ti: 0.07%, Al: 5.7%, Cr: 22%, Co: 0.010%, Zr: 0.1%, Y: 0.5%, Fe is the balance, and the total weight of ingredients is 615kg.

[0062] The following table 1 is the alloy composition after smelting and the atomized powder alloy composition table (unit %)

[0063]

[0064] Table 2 below shows the particle size distribution, specific surface area, and oxygen content of the Fe-Cr-Al alloy powder prepared in Embodiment 1.

[0065]

[0066] It can be seen from Table 2 that the powder has low oxygen content and good surface activity, which can provide high-quality raw materials for subsequent powder molding processing.

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Abstract

The invention relates to the technical fields of metal smelting and powder preparation, and discloses a manufacturing method for a high-purity iron-chromium-aluminum alloy powder. The manufacturing method comprises the two phases of melting and gas atomization. Compared with the prior art, the manufacturing method is capable of effectively preventing powder oxidation and avoiding impurity elements; and meanwhile, a powder is adequately dispersed in a cooling process, and the generation of a satellite spherical powder in the powder is reduced, so that preparation for the spherical alloy power with a small particle size is realized. The prepared alloy powder is small in particle size, high in sphericity degree and flowability, low in oxygen content and satellite spherical powder content, good in atomization effect, and capable of effectively preventing the powder oxidation, realizing high purity of alloy, refining crystalline grains, reducing inclusions, reducing separation for the brittle phase of nitride, and providing raw materials with excellent performance for the subsequent powder metallurgy process.

Description

technical field [0001] The invention relates to the technical field of metal smelting and powder preparation, in particular to a Fe-Cr-Al alloy vacuum furnace smelting and powder-making process thereof. Background technique [0002] In order to reduce coal-burning pollution in winter and improve air quality, my country has promoted the policies of "coal to electricity" and "coal to gas" since 2017, which has ushered in an opportunity for the development of my country's electric heating alloy industry. Metal-type electric heating materials are the most widely used heating elements for household and industrial heaters at home and abroad, especially Fe-Cr-Al alloys are the most common. For example, industrial diffusion furnaces and high-temperature furnaces require metal heating elements to maintain a temperature as high as 1300°C for a long time. Iron-based alloys have the advantages of high resistivity, good thermal stability, long service life, abundant resources, and low c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/08C22C33/02C22C38/02C22C38/04C22C38/06C22C38/28C22C38/30C22C38/50C22C38/52
CPCB22F9/082C22C38/02C22C38/04C22C38/002C22C38/06C22C38/50C22C38/52C22C38/005C22C33/0207C22C33/0264C22C38/28C22C38/30B22F2009/0848B22F1/065B33Y70/00
Inventor 杨华兴杨建红彭伟平周志坚王绍爽
Owner JIANGSU UNIV
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