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Method and device for preparation of micron-sized iron-based hollow sphere material

A hollow sphere and micron-scale technology, which is applied in the field of building decoration materials, can solve the problems of few hollow spheres made of iron-based materials with high melting point, few researches on hollow powders, and many hollow powders, etc., to achieve fine structure and low oxygen content , the effect of high sphericity

Active Publication Date: 2013-12-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many methods for the production of hollow spheres, and the more mature methods are: template method, microemulsion method, interface self-assembly reaction method, template-interface reaction method, hydrothermal solvent reaction method, spray method, ultrasonic method and γ-ray irradiation method Wait, from the perspective of preparation methods, each method has its advantages and disadvantages. At present, the template method is the main method, but these technologies rarely carry out the preparation of hollow spheres of high melting point iron-based materials, and the technology is complicated and difficult to control. At the same time, hollow powders at the nanometer or micronano level are mostly produced, and hollow powders at the level of tens to hundreds of microns or even millimeters are rarely studied.

Method used

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  • Method and device for preparation of micron-sized iron-based hollow sphere material
  • Method and device for preparation of micron-sized iron-based hollow sphere material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Put 5kg of pure iron and pure manganese (99.7%) in the induction melting chamber according to the mass ratio of 87:13 ( figure 1 ) in the dry pot, adjust the protruding length of the nozzle guide tube to 3.5-9.5mm, and the inner diameter to 3.0-5.5mm.

[0017] 2. Turn on the power supply and air source of the electric cabinet ( figure 1 ), water cooling system, adjust the water pressure to 0.3-0.4MPa, turn on the power of the holding furnace to preheat the holding crucible, the preheating temperature is 1100°C-1550°C.

[0018] 3. Turn on the smelting power switch, adjust the water pressure, turn on the inverter switch, adjust the intermediate frequency to make it vibrate, and then slowly adjust the power to 30kW. After the alloy is melted, control the superheat to 220°C-420°C (infrared temperature measurement). When shutting down, slowly lower the power, reduce the intermediate frequency to 0, turn off the inverter, and finally turn off the smelting power switch ( ...

Embodiment 2

[0022] 1. Put 5kg of pure iron and pure manganese in the induction melting chamber according to the mass ratio of 83:17 ( figure 1 ) in the dry pot, adjust the protruding length of the nozzle guide tube to 3.0-9.0mm, and the inner diameter to 3.5-5.5mm.

[0023] 2. Turn on the power supply and air source of the electric cabinet ( figure 1 ), water cooling system, the water pressure is adjusted to 0.3-0.4MPa, turn on the power of the holding furnace to preheat the holding crucible, the preheating temperature is 1150°C-1550°C.

[0024] 3. Turn on the smelting power switch, adjust the water pressure, turn on the inverter switch, adjust the intermediate frequency to make it vibrate, and then slowly adjust the power to 30kW. After the alloy is melted, control the superheat to 250°C-420°C (infrared temperature measurement). When shutting down, slowly lower the power, reduce the intermediate frequency to 0, turn off the inverter, and finally turn off the smelting power switch ( fi...

Embodiment 3

[0028] 1. Put the high molybdenum cast iron in the induction melting chamber ( figure 1 ) in the dry pot, adjust the protruding length of the nozzle guide tube to 3.2-9.0mm, and the inner diameter to 3.5-6.5mm.

[0029] 2. Turn on the power supply and air source of the electric cabinet ( figure 1 ), vacuum, water cooling system, the water pressure is adjusted to 0.3-0.4MPa,

[0030] 3. Close all valves, and when the vacuum is within 10Pa, turn on the power of the holding furnace to preheat the holding crucible, the preheating temperature is 1150°C-1450°C.

[0031] 4. Turn on the smelting power switch, adjust the water pressure, turn on the inverter switch, adjust the intermediate frequency to make it vibrate, and then slowly adjust the power to 30kW. After the alloy is melted, control the superheat to 260°C-400°C (infrared temperature measurement). When shutting down, slowly lower the power, reduce the intermediate frequency to 0, turn off the inverter, and finally turn off...

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Abstract

The invention relates to a method and a device for preparation of micron-sized iron-based hollow sphere material, and belongs to the technical field of novel functional building decoration materials. The metal hollow sphere material is prepared by a gas atomization method; pressure of nitrogen gas is controlled within a certain range, so that superheated melt with dissolved gas and gas-forming property substance is atomized into micro-liquid-drops. The atomized liquid drops are cooled by an atomizing medium quickly, and the surfaces of the liquid drops are solidified to form solidified casings to prevent gas from separating out of the surfaces of the liquid drops; during temperature reduction of the liquid drops, gas solubility is decreased so that the dissolved gas is separated out to enter the insides of the liquid drops to form cavities therein; during solidifying, volume of the liquid drops is reduced quickly due to the liquid-solid volume change, and the liquid drops contract to form hollow metal spheres. By the method and the device, micron-sized and even millimeter-sized hollow spheres with high sphericity can be manufactured, particle size of the spheres ranges from several microns to hundreds of microns in normal distribution, and the spheres have small tissues, low oxygen content and high rigidity due to high cooling speed.

Description

technical field [0001] The invention relates to a method for preparing hollow spheres of micron-level materials, in particular to a method for preparing iron-based micron-level hollow sphere materials, and belongs to the technical field of building decoration materials. Background technique [0002] Hollow microspheres are porous materials with low density, high surface area and unique mechanical and thermal properties, which make them have important applications in lightweight materials. It can not only improve the properties of matrix materials, but also give new properties to materials. , such as sound insulation, flame retardant and heat insulation, etc. Therefore, hollow sphere materials have great potential application value in the fields of building decoration materials, coatings industry and other fields, and the hollow part can accommodate a large number of guest molecules or large-sized objects, resulting in some peculiar microscopic "packages" The nature of the "e...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 宋长江谢柯卢威杨洋赵仕超翟启杰
Owner SHANGHAI UNIV
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