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Preparation process of pure Fe3C blocks

A preparation process and block technology, which is applied in the field of Fe3C material preparation, can solve problems such as explosion, difficulty in obtaining precise control, high risk, etc., and achieve the effect of simple process and excellent mechanical performance indicators

Inactive Publication Date: 2015-04-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas reduction method has the following disadvantages: a) it is carried out between solid and gas, the raw materials are difficult to react completely, and it is easy to cause the product to be impure; b) a slight change in the reaction conditions will seriously affect the purity of the product, and these conditions in the presence of gas It is difficult to get precise control when participating; c) This method is more dangerous, and the gas participating in the reaction has the risk of explosion in the air
And about obtaining pure high density (more than 99%) Fe 3 Block C has not yet been reported

Method used

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  • Preparation process of pure Fe3C blocks

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, reduced Fe powder (purity and particle size: 99.9% and 200 μm, respectively) and amorphous C powder (purity and particle size: 99.9% and 200 μm, respectively) were prepared by Fe 3 In the C molecular formula, the atomic ratio and the atomic weight of each element are converted into a weight ratio, weighed and packed into a stainless steel ball mill jar, and simultaneously add Fe powder and 0.3% phenolic resin of the amorphous C powder gross weight to vacuumize (vacuum degree: 10 -1 Pa).

[0021] Then, put the ball mill tank into the ball mill and turn it on, the ball mill speed is 400rpm, and the ball mill time is 120 hours. After the ball mill is completed, the mixed powder is cooled to room temperature with the tank, and the mixture of Fe powder, amorphous C powder and phenolic resin Fill into a graphite crucible.

[0022] Finally, put the graphite crucible containing the mixture of Fe powder, amorphous C powder and phenolic resin into the plasma activation s...

Embodiment 2

[0025] The technological process of the present embodiment is the same as embodiment 1, but following technological parameters have different changes:

[0026] The particle size of the reduced Fe powder is 60 μm, and that of the amorphous C powder is 50 μm.

[0027] The ball milling time is 60 hours.

[0028] In the first stage, the sintering temperature is 300°C, and the heat preservation is 30 minutes; in the second stage, the sintering pressure is 50Mpa, the sintering temperature is 700°C, and the heat preservation is also 5 minutes.

[0029] The pure Fe obtained in the present embodiment 3 The relative density of C block is 99.8%. The microstructure analysis of the block sample was carried out, and the photos of the fracture morphology are as follows: figure 1 shown. It can be seen from the figure that the grains are well bonded, and there is basically no hole.

Embodiment 3

[0031] The technological process of the present embodiment is the same as embodiment 1, but following technological parameters have different changes:

[0032] The particle size of the reduced Fe powder is 100 μm, and that of the amorphous C powder is 100 μm.

[0033] The ball milling time is 100 hours.

[0034] The sintering temperature of the first stage is 250°C, and the temperature is kept for 45 minutes; the sintering pressure of the second stage is 45Mpa, and the sintering temperature is 650°C.

[0035] The pure Fe obtained in the present embodiment 3 The relative density of C block is 98.6%.

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Abstract

The invention discloses a preparation process of pure Fe3C blocks. The preparation process comprises the following steps: firstly, weighing reducing Fe powder and amorphous C powder in a weight ratio converted from the atomic ratio and the atomic weights of various elements in the molecular formula Fe3C, putting the weighed materials into a ball milling jaw, and meanwhile, adding a certain amount of phenolic resin and vacuumizing; secondly, putting the ball milling jar into a ball mill for ball milling for 60-120 hours, taking the mixture of the reducing Fe powder and the amorphous C powder and arranging the mixture into a graphite crucible; finally, putting the graphite crucible into a plasma activating sintering furnace for two stages of vacuum sintering, namely slow pressureless sintering at a temperature ranging from 150 to 300 DEG C at the first stage and fast pressure sintering at a temperature ranging from 500 to 700 DEG C at the second stage, and cooling along with the furnace, thereby obtaining the pure Fe3C blocks.

Description

technical field [0001] The invention relates to a Fe with high hardness and good corrosion resistance and wear resistance. 3 The preparation method of C material. Background technique [0002] Fe 3 C is used as a hard phase in ordinary white cast iron to resist wear and corrosion. This compound belongs to an orthorhombic lattice and is an interstitial compound with a complex lattice structure. The carbon content is 6.69% (weight percent), Allotropic transformation does not occur, its hardness is high, and it has good chemical corrosion resistance and wear resistance. Currently, the preparation of Fe 3 C commonly used methods are: 1) reduction carburizing method; 2) thermal decomposition method; 3) laser method and chemical vapor deposition method, etc. [0003] The reduction carburizing method includes the gas reduction carburizing method and the solid reduction carburizing method, both of which have deficiencies. The gas reduction method has the following disadvantages...

Claims

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Application Information

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IPC IPC(8): C01B31/30
Inventor 皇志富郑宝超邢建东高义民
Owner XI AN JIAOTONG UNIV
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