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Vacuum heat treatment technology for magnesium alloy casting

A technology of vacuum heat treatment and magnesium alloy, which is applied in the field of investment casting of magnesium alloy, can solve problems such as equipment corrosion, hazards, and air pollution, achieve health and environmental protection, meet material technical requirements, and reduce air pollution.

Inactive Publication Date: 2017-05-17
GUIZHOU ANJI AVIATION PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a vacuum heat treatment process for magnesium alloy castings to solve the problems that a large amount of sulfur dioxide gas will be generated in the existing magnesium alloy heat treatment process, which will easily cause corrosion of equipment, cause great harm to workshops and personnel, and pollute the atmosphere.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Turn on the air pump and water pump, prepare two bottles of high-purity 99.99% argon gas and connect the argon gas bottle to the inflation pipeline, turn on the switch of the argon gas bottle, let the pressure of the argon gas output end be about 8kg; open the lock ring and put it in the lock ring When the open position light is on, open the vent valve to put the air into the furnace body, so that the air pressure inside and outside the furnace body is the same as the external atmospheric pressure; The forklift loads the magnesium alloy castings into the furnace of the heating furnace; after the castings are placed, the forklift leaves and closes the furnace cover and locks the lock ring to realize the sealing of the furnace; turn on the vacuum pump, vacuumize for 2 hours, and charge the normal temperature and air pressure in the furnace to the gauge pressure of 42Pa. Fill to 40Pa; open the gas charging valve to inject inert gas into the furnace, the pressure in the furn...

Embodiment 2

[0030] Turn on the air pump and water pump, prepare two bottles of high-purity 99.99% argon gas and connect the argon gas bottle to the inflation pipeline, turn on the switch of the argon gas bottle, let the pressure of the argon gas output end be about 3kg; open the lock ring and put it in the lock ring When the open position light is on, open the vent valve to put the air into the furnace body, so that the air pressure inside and outside the furnace body is the same as the external atmospheric pressure; The forklift loads the magnesium alloy castings into the furnace of the heating furnace; after the castings are placed, the forklift leaves and closes the furnace cover and locks the lock ring to realize the sealing of the furnace; turn on the vacuum pump, vacuumize for 0.5h, and charge the normal temperature and air pressure in the furnace to the gauge pressure of 38Pa. Fill the furnace to 36Pa; open the gas filling valve to inject inert gas into the furnace, and the pressure...

Embodiment 3

[0032] Turn on the air pump and water pump, prepare two bottles of high-purity 99.99% argon gas and connect the argon gas bottle to the inflation pipeline, turn on the switch of the argon gas bottle, let the pressure of the argon gas output end be about 5kg; open the lock ring and put it in the lock ring When the open position light is on, open the vent valve to put the air into the furnace body, so that the air pressure inside and outside the furnace body is the same as the external atmospheric pressure; The forklift loads the magnesium alloy castings into the furnace of the heating furnace; after the castings are placed, the forklift leaves and closes the furnace cover and locks the lock ring to realize the sealing of the furnace; turn on the vacuum pump, evacuate for 1 hour, and the normal temperature and air pressure in the furnace is charged to gauge pressure 33Pa, and the furnace is heated Fill the furnace to 31Pa; open the gas charging valve to inject inert gas into the ...

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PUM

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Abstract

The invention discloses a vacuum heat treatment technology for a magnesium alloy casting. According to the technology, vacuum pumping is conducted firstly, oxygen molecules do not exist in a hearth after vacuum pumping, then the hearth is inflated with high-purity inert gases, the pressure of the inert gases is slightly higher than the atmospheric pressure, it is guaranteed that air outside the hearth cannot enter the hearth, then heat treatment is conducted, and then oxidization and combustion of the casting are prevented. According to the technology, gases such as sulfur hexafluoride, sulfur dioxide and carbon dioxide do not need to be used, iron pyrite preventing oxidization does not need to be added neither, accordingly, the sulfur dioxide corrosive gas cannot be generated in the heat treatment process, and equipment can be effectively prevented from being corroded; and meanwhile, a protection function is achieved for health of operators and environment protection, atmospheric pollution is reduced, and energy saving and environment friendliness are achieved.

Description

technical field [0001] The invention relates to the technical field of investment casting of magnesium alloys, in particular to a vacuum heat treatment process for magnesium alloy castings. Background technique [0002] Similar to other metal materials, magnesium alloys are often heat treated to improve their performance and process performance. Common heat treatment methods for magnesium alloys include annealing, solution treatment, and aging. [0003] Magnesium alloys can be heat treated in air, but when the heat treatment temperature exceeds 400°C, protective gas should be used during heat treatment. The commonly used shielding gas contains three gases, namely sulfur hexafluoride, sulfur dioxide and carbon dioxide. Adding 0.5% to 1.5% sulfur hexafluoride to carbon dioxide can prevent the natural temperature above 600°C; sulfur hexafluoride is more expensive than sulfur dioxide or carbon dioxide, but has a strong "greenhouse effect". Sulfur dioxide is also more expensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22F1/02
CPCC22F1/06C22F1/02
Inventor 黎敬
Owner GUIZHOU ANJI AVIATION PRECISION CASTING