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Preparation method of spray granulation Fe-Al2O3 spraying composite powder

A fe-al2o3, spray granulation technology, applied in the direction of coating, molten spraying, metal material coating technology, etc., can solve the problems of high cost, complicated preparation process, not good enough oxidation resistance, etc., to achieve compactness Good, uniform particle size distribution, excellent chemical stability and high temperature oxidation resistance

Inactive Publication Date: 2020-03-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the article points out that iron powder can be coated with alumina to improve its oxidation resistance. To achieve this purpose, the methods currently used are relatively expensive or the oxidation resistance effect is not good enough and the preparation process is complicated.

Method used

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  • Preparation method of spray granulation Fe-Al2O3 spraying composite powder
  • Preparation method of spray granulation Fe-Al2O3 spraying composite powder
  • Preparation method of spray granulation Fe-Al2O3 spraying composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, slurry preparation:

[0025] Take 300g of ultrafine Fe powder and 1200g of ultrafine Al 2 o 3 Put the powder into a 10L roller milling tank, add 45g of binder PEI and 15g of defoamer, and add zirconia balls with diameters of 5mm and 10mm and a total weight of 3120g, and finally add 1560g of deionized water as a solvent , followed by ball milling for stirring and dispersing, the stirring time is 6 hours, and then the spray granulation slurry (viscosity 0.133Pa.s) is obtained.

[0026] The SEM morphology of the original powder used in this embodiment is as follows figure 1 As shown, it can be seen that the shape of the original powder is irregular, the particle size is small, and the distribution is uneven, so it cannot be used as a spray powder.

[0027] Step 2, spray granulation:

[0028] Use centrifugal spray granulation machine to carry out spray granulation to the slurry obtained above. Before granulation, heat the machine to 245°C, then control the inlet...

Embodiment 2

[0033] Step 1, slurry preparation:

[0034] Get 950g of ultrafine Fe powder and 2800g of ultrafine Al 2 o 3 Put the powder into a 10L roller mill jar, add 112.5g of binder PEI and 37.5g of defoamer, add zirconia balls with diameters of 5mm and 10mm, and a total weight of 7800g, and finally add 3900g of deionized water As a solvent, it was then dispersed by ball milling for 8 hours to obtain a spray granulation slurry (viscosity of 0.133 Pa.s).

[0035] The SEM morphology of the original powder used in this embodiment is as follows figure 1 As shown, it can be seen that the shape of the original powder is irregular, the particle size is small, and the distribution is uneven, so it cannot be used as a spray powder.

[0036] Step 2, spray granulation:

[0037] Use a centrifugal spray granulation machine to spray and granulate the slurry obtained above. Before granulation, the machine is heated to 240°C, and then the air inlet temperature is controlled at 260°C during the gran...

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Abstract

The invention belongs to a preparation method of metal / ceramic composite powder in spraying application, and particularly relates to a preparation method of spray granulation Fe-Al2O3 spraying composite powder. The preparation method is simple to operate, high in performance and free of screening. According to the preparation method, PEI is adopted as a binder, so that metal Fe powder and Al2O3 powder are tightly bonded and uniformly distributed; in addition, PEI also has the effect of a dispersing agent, so that the effect of two purposes is achieved, the requirement for preparing low-viscosity slurry is met, the possibility that the dispersing agent and the binder are adopted at the same time to react is avoided, and the obtained slurry is low in viscosity and high in solid content. Finally, on the premise that particles can be bonded with one another, the obtained powder is uniform in particle size distribution, high in sphericity degree and good in compactness and fluidity, the metal Fe powder has excellent oxidation resistance, and preparation of a subsequent spraying wave-absorbing coating is facilitated.

Description

technical field [0001] The invention belongs to the preparation method of metal / ceramic composite powder in spraying application, specifically a kind of spray granulation Fe-Al 2 o 3 A preparation method for spraying composite powder, the preparation method is simple to operate, has good performance and does not need sieving. Background technique [0002] With the rapid development of modern science and technology and economy, electromagnetic wave absorbing technology has been widely used in military and civilian fields. The increasingly miniaturization and integration of electronic equipment in daily life makes the demand for its ability to resist electromagnetic interference more and more urgent. In the military field, the application of wave-absorbing materials can greatly weaken or eliminate the ability of radar to detect targets. With the rapid development of modern science and technology, the requirements for absorbing materials in various related fields are not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F9/02C23C4/06C23C4/134
CPCB22F9/026B22F9/04C23C4/06C23C4/134
Inventor 王昕蒋先玉胡静刘志杰江绍亮张丽邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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