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A method of preparing calcium oxide particle dispersion strengthened iron powder by internal oxidation method

A technology of particle dispersion strengthening and internal oxidation, which is applied in the field of preparation of calcium oxide particle dispersion strengthening iron powder, which can solve the problems of high cost, easy introduction of impurities, and insufficient fineness and uniformity of the dispersed phase, and achieve low cost, convenient operation, and dispersed phase small effect

Inactive Publication Date: 2015-08-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem that the dispersed phase in the dispersion-strengthened steel prepared by the mechanical alloying method is not fine and uniform enough, and impurities are easily introduced; and the problem that the process parameters of the traditional internal oxidation method are difficult to control and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: preparation mass fraction is that the calcium oxide particle dispersion strengthened iron powder of 0.5% should follow the following steps

[0010] 1-1 Melting:

[0011] 1-1-1 Ingredients: The raw materials used in the experiment are pure iron (purity: 99.9%) and calcium carbide (purity: 99.9%). Weigh 6965g of pure iron and 40g of calcium carbide.

[0012] 1-1-2 Put the weighed iron block into the induction furnace for smelting, the smelting temperature is 1650℃, and then put the calcium carbide into the molten iron to dissolve it.

[0013] 1-2 Water atomization: The smelted molten iron is hydrated with a closed V-shaped nozzle under a pressure of 14Mpa to produce calcium-containing iron powder.

[0014] 1-3 Surface oxidation treatment of powder particles: The prepared calcium-containing iron powder was subjected to surface oxidation treatment at 350° C. in air for 2.5 hours.

[0015] 1-4 Internal oxidation treatment of powder particles: put the surface...

Embodiment 2

[0017] Embodiment 2: preparation mass fraction is that the calcium oxide particle dispersion strengthened iron powder of 1.0% should follow the following steps

[0018] 2-1 Melting:

[0019] 2-1-1 Ingredients: The raw materials used in the experiment are pure iron (purity: 99.9%) and calcium carbide (purity: 99.9%). Weigh 6930g of pure iron and 80g of calcium carbide.

[0020] 2-1-2 Put the weighed iron block into the induction furnace for smelting, the smelting temperature is 1700℃, and then put the calcium carbide into the molten iron to dissolve it.

[0021] 2-2 Water atomization: The smelted molten iron is hydrated with a closed V-shaped nozzle under a pressure of 10Mpa to produce calcium-containing iron powder.

[0022] 2-3 Surface oxidation treatment of powder particles: The prepared calcium-containing iron powder is subjected to surface oxidation treatment at 400°C in air for 1.5h.

[0023] 2-4 Internal oxidation treatment of powder particles: The surface oxidized po...

Embodiment 3

[0025] Embodiment 3: preparation mass fraction is that the calcium oxide particle dispersion strengthened iron powder of 2.0% should follow the following steps

[0026] 3-1 Melting:

[0027] 3-1-1 Ingredients: The raw materials used in the experiment are pure iron (purity 99.9%) and calcium carbide (purity 99.9%). Weigh 6860g of pure iron and 160g of calcium carbide.

[0028] 3-1-2 Put the weighed iron block into the induction furnace for smelting, the smelting temperature is 1750℃, and then put the calcium carbide into the molten iron to dissolve it.

[0029] 3-2 Water atomization: The smelted molten iron is hydrated with a closed V-shaped nozzle under a pressure of 13Mpa to produce calcium-containing iron powder.

[0030] 3-3 Surface oxidation treatment of powder particles: The prepared calcium-containing iron powder was subjected to surface oxidation treatment at 400° C. in air for 2 hours.

[0031] 3-4 Internal oxidation treatment of powder particles: put the surface ox...

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Abstract

The invention provides a method for preparing calcium oxide particle dispersion strengthening iron powder by adopting an internal oxidation method, belonging to the field of oxide dispersion strengthening materials. The method is characterized in that a certain amount of pure iron briquettes and calcium carbide are put in an induction furnace so as to be smelted, and then water atomization powder preparation is carried out; and prepared primary powder is subjected to surface oxidation treatment for 1 to 3 hours at 300-500 DEG C, then the internal oxidation treatment is carried out for 2 to 5 hours at 850-1100 DEG C in a vacuum or N2 atmosphere, and finally the reduction treatment is carried out for 2 to 4 hours at 700-1000 DEG C in an H2 atmosphere. The dispersed phase calcium oxide of the calcium oxide particle dispersion strengthening iron powder prepared by the method has the characteristics of tiny particles and uniform distribution. The method is simple and convenient to operate, very low in cost and easy for realizing the industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of oxide dispersion strengthened (Oxide Dispersion Strengthened, ODS) materials, and particularly provides a method for preparing calcium oxide particle dispersion strengthened iron powder by adopting an internal oxidation method. technical background [0002] Oxide particle dispersion strengthened steel has a strong pinning effect on dislocations and grain boundaries due to the presence of a large number of fine and dispersed oxide particles, thereby improving the room temperature and high temperature strength of the alloy. Oxide particle dispersion strengthened steel belongs to the BCC crystal structure and has the performance of resisting neutron radiation. Moreover, oxide particle dispersion strengthened steel also has excellent oxidation resistance and corrosion resistance. Therefore, oxide particle dispersion strengthened steel has been widely used in severe high temperature environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02B22F9/08
Inventor 郭志猛徐延龙杨微微罗骥曹慧钦于潇于海华陈骏
Owner UNIV OF SCI & TECH BEIJING