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Reduced metal particle high speed micro-forging forming process

A metal particle and forming process technology, which is applied in the field of high-speed micro-forging forming process for reducing metal particles, can solve the problems of low deposition rate, high energy consumption, and inability to eliminate oxygen, and achieve simple operation, strong reducing ability, and easy control of fluidity Effect

Active Publication Date: 2009-09-23
BAOSHAN IRON & STEEL CO LTD
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  • Application Information

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Problems solved by technology

[0006] The cold spray technology completely utilizes the kinetic energy of the particles for deposition, which has extremely high requirements for the surface state of the particles. Once an oxide film exists on the surface, the energy consumption is extremely high, and the oxygen in the structure cannot be eliminated. Only erosion often occurs, and the deposition rate is relatively low. Low

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Examples

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Embodiment 1

[0050] Copper alloy threads are prepared on the inner wall of the steel pipe. Using gas atomized copper alloy particles, the melting point of the particle material is 1050°C, and the average particle size of the particles is 35 microns. The copper alloy particles are fully reduced by the method of ammonolysis reduction, and the internal oxygen is eliminated. The particles were passed through in an air environment at 400° C., and the particle temperature was equalized for 5 seconds to obtain micro-oxidized copper alloy particles on the surface. The oxygen content is 3%. The micro-copper oxide alloy particles were rapidly heated to 500°C under nitrogen protection, and sent to a nitrogen-hydrogen mixed high temperature and high pressure reduction chamber with a hydrogen content of 1%. The temperature in the reduction chamber was 600°C and the pressure was 25 bar. Then, it is introduced into the accelerator, accelerated to 1.5 times the speed of sound, and formed by integral mic...

Embodiment 2

[0052] A streamlined aluminum-magnesium alloy composite structural skeleton is prepared in the cavity of the composite material structure. Aluminum-magnesium alloys are notoriously difficult to prepare and process. In this experiment, aerosolized aluminum-magnesium alloy particles were used, the melting point of the particle material was 760 °C, and the average particle size of the particles was 75 microns. The aluminum-magnesium alloy particles were reduced by the hydrogen reduction method, and the internal oxygen was eliminated. The particles were passed through in an air environment at 300°C, and the particle temperature was equalized for 3 seconds to obtain micro-alumina-magnesium alloy particles on the surface. The oxygen content is about 2.5%. Under the protection of helium, the micro-alumina-magnesium alloy particles are rapidly heated to 350 ° C, and sent to a nitrogen-hydrogen mixed high temperature and high pressure reduction chamber with a hydrogen content of 1%. ...

Embodiment 3

[0054] Preparation of stainless steel profiled rolling die. Use water atomized stainless steel powder. The melting point of the particle material was 1750° C., and the average particle diameter of the particles was 30 μm. The stainless steel particles are fully reduced by the method of ammonolysis reduction, and the internal oxygen is eliminated. The particles were passed through in an air environment at 700° C., and the particle temperature was equalized for 5 seconds to obtain micro-oxidized stainless steel particles on the surface. The oxygen content is 5%. Under nitrogen protection, the micro-oxidized stainless steel particles are rapidly heated to 600°C, and sent to a nitrogen-CO mixed high temperature and high pressure reduction chamber containing 6% CO. The temperature in the reduction chamber is 800°C and the pressure is 30bar. Then, it is introduced into the accelerator, accelerated to 2.0 times the speed of sound, and formed by integral micro-forging. A stainless...

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Abstract

The invention relates to a reduced metal particle high speed micro-forging forming process. The process comprises the following steps: a) preparing spherical metal particles through an atomization method, and carrying out the micro-oxidation treatment on the particles; b) reducing the metal particles in a high temperature high pressure reducing cavity so as to make the metal particles obtain high activity fresh surfaces, filling up the high pressure reducing cavity with a gas mixture of inert gas and hydrogen, setting the proportion of the hydrogen to between 1 and 6 percent, and setting the temperature of the metal particles inside the reducing cavity at 0.5Tm to 0.8Tm and the pressure at 20 to 40atm; and c) carrying out the high speed micro-forging forming of the metal particles on a die when the metal particles are accelerated by an accelerator, and obtaining a die surface-shaped material. The body material obtained through the high speed micro-forging forming of the fresh reduced metal particles with a high speed, a high temperature and high surface activity has a metallurgical integrated structure. The process is suitable for the preparation of metal materials with various complex shapes.

Description

technical field [0001] The invention relates to a reduction high-speed micro-forging forming technology for metal particles, in particular to a high-speed micro-forging forming process for reduced metal particles in which the surface micro-oxidized particles are directly micro-forged after reduction to form structural materials. Background technique [0002] Typically, metal structural materials are formed by solidifying a metal melt into a solid in a certain container. Some materials are also formed by solidifying into a solid under a specific mold-free condition. However, the formation of these materials is limited by the mold to a certain extent, and the prepared shape cannot be too complicated. If the structure is complex, it is difficult to process after the as-cast state is formed. The density of the metal is difficult to reach the ideal value, which affects the mechanical properties of the structure. The shape solidified into a solid under mold-free conditions is mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/17B22F9/22
Inventor 张俊宝梁永立宋洪伟张宇军
Owner BAOSHAN IRON & STEEL CO LTD
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