Low-temperature dehydration treatment method for metallurgical alloy powder

A technology of low-temperature dehydration and treatment method, which is applied in the direction of drying solid materials without heating, lighting and heating equipment, and drying. It can solve the problems of slow water sublimation, large specific surface area, and oxidation of alloy powder, and achieve simple operation and dispersion good sex effect

Active Publication Date: 2019-06-21
武汉市赟巨科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The chemical properties of aluminum and magnesium are active. Due to the large specific surface area of ​​magnesium powder, aluminum-magnesium and other alloy powders, their production, storage and use are easy to slowly react with oxygen and moisture in the air, resulting in a decrease in effective activity and affecting the use effect. It is easy to induce various safety hazards due to the exothermic reaction
[0003] The existing drying process of magnesium powder and aluminum-magnesium alloy powder has the following defects: 1. The drying process requires high-temperature heating and inert gas protection, and the airtightness of the equipment is high, otherwise it is easy to cause safety accidents such as alloy powder oxidation, combustion and explosion; 2. The protection effect of using cheap nitrogen gas is not ideal, while the cost of using other inert gases is high
[0005] Vacuum freeze-drying is currently recognized as the dehydration method with the best drying quality. It is widely used in the food and pharmaceutical industries. Cause energy waste; Temperature setting is higher, can make sample oxidative deterioration again, can't reach the purpose of vacuum freeze-drying; Present freeze-drying technology is all more (Zhou Guoyan et al., 2010; Pan Qingfang and Zhou Guoyan, 2011; Chi Chunshan, 2010), there is no report on the dehydration treatment of alloy powder samples in metallurgical research.

Method used

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  • Low-temperature dehydration treatment method for metallurgical alloy powder
  • Low-temperature dehydration treatment method for metallurgical alloy powder

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Effect test

Embodiment 1

[0030] This embodiment provides a low-temperature dehydration treatment method for metallurgical alloy powder, comprising the following steps:

[0031] S1. Pre-freezing: Put the alloy powder to be dehydrated into the freeze-drying equipment, start the compressor, set the temperature in the freeze-drying equipment to -20°C within 0.3-1.2h, and maintain it for 0.75h;

[0032] S2. Freezing: after the end of heat release, set the temperature in the freeze dryer to drop below -40°C within 0.8 hours, and then control the pressure in the freeze dryer to below 10Pa and maintain it for 6 hours;

[0033] S3. Sublimation: set the temperature inside the freeze-drying equipment at -5°C, and keep the vacuum below 10Pa, and keep warm for 2 hours; then adjust the vacuum degree to 50Pa, and keep the temperature inside the freeze-drying equipment at -5°C, and continue to keep warm for 3h;

[0034] S4. Analysis: After sublimation, set the temperature inside the freeze-drying equipment to 32°C, a...

Embodiment 2

[0040] This embodiment provides a low-temperature dehydration treatment method for metallurgical alloy powder, comprising the following steps:

[0041] S1. Pre-freezing: Put the alloy powder to be dehydrated into the freeze-drying equipment, start the compressor, set the temperature in the freeze-drying equipment to -20°C within 0.75h, and maintain it for 0.3-1.2h;

[0042] S2. Freezing: after the end of heat release, set the temperature in the freeze dryer to drop below -40°C within 0.8 hours, and then control the pressure in the freeze dryer to below 10Pa and maintain it for 6 hours;

[0043] S3. Sublimation: set the temperature inside the freeze-drying equipment at -5°C, and keep the vacuum below 10Pa, and keep warm for 2 hours; then adjust the vacuum degree to 50Pa, and keep the temperature inside the freeze-drying equipment at -5°C, and continue to keep warm for 3h;

[0044] S4. Analysis: After sublimation, set the temperature inside the freeze-drying equipment to 32°C, a...

Embodiment 3

[0050]This embodiment provides a low-temperature dehydration treatment method for metallurgical alloy powder, comprising the following steps:

[0051] S1. Pre-freezing: Put the alloy powder to be dehydrated into the freeze-drying equipment, start the compressor, set the temperature in the freeze-drying equipment to -20°C within 0.75h, and maintain it for 0.75h;

[0052] S2. Freezing: After the end of heat release, set the temperature in the freeze dryer to drop below -40°C within 0.2 to 1.2 hours, and then control the pressure in the freeze dryer to below 10Pa and maintain it for 6 hours;

[0053] S3. Sublimation: set the temperature inside the freeze-drying equipment at -5°C, and keep the vacuum below 10Pa, and keep warm for 2 hours; then adjust the vacuum degree to 50Pa, and keep the temperature inside the freeze-drying equipment at -5°C, and continue to keep warm for 3h;

[0054] S4. Analysis: After sublimation, set the temperature inside the freeze-drying equipment to 32°C...

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Abstract

The invention discloses a low-temperature dehydration treatment method for metallurgical alloy powder. The alloy powder has the moisture content lower than 0.5% after low-temperature vacuum freeze-drying by the aid of the vacuum freeze-drying technology, the alloy powder is free from the oxidation browning phenomenon during drying, powder particles are free from the adhesion or agglomeration phenomenon after being dried, the dispersity is high, and the influence on the performance of the alloy powder is relatively low; the whole drying process is performed at the low temperature, so that safety accidents such as oxidation, combustion and explosion of the alloy powder during high-temperature drying are avoided; and the method is easy to operate, relatively short in consumed time for freeze-drying and applicable to dehydration treatment of large batches of alloy powder samples.

Description

technical field [0001] The invention relates to the technical field of drying, in particular to a low-temperature dehydration treatment method for metallurgical alloy powder. Background technique [0002] The chemical properties of aluminum and magnesium are active. Due to the large specific surface area of ​​magnesium powder, aluminum-magnesium and other alloy powders, their production, storage and use are easy to slowly react with oxygen and moisture in the air, resulting in a decrease in effective activity and affecting the use effect. It is easy to induce various safety hazards due to the exothermic reaction. [0003] The existing drying process of magnesium powder and aluminum-magnesium alloy powder has the following defects: 1. The drying process requires high-temperature heating and inert gas protection, and the airtightness of the equipment is high, otherwise it is easy to cause safety accidents such as alloy powder oxidation, combustion and explosion; 2. The protec...

Claims

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Application Information

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IPC IPC(8): F26B5/06
Inventor 周建安周亮
Owner 武汉市赟巨科技有限公司
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