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Method for preparing radiator element with complicated shape

A complex shape and heat sink technology, applied in the field of powder metallurgy, can solve problems such as difficulty in mold filling, achieve the effects of reducing processing costs, precise control of organization, and overcoming waste

Inactive Publication Date: 2009-09-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Micro-injection molding technology, because the processed parts are parts whose appearance size is only on the order of microns or the size of the characteristic functional area is on the order of microns, which leads to the fact that compared with the traditional injection molding method, the powder micro-injection molding technology uses raw materials The powder is fine, usually the average particle size of the powder is less than 5 μm, and the mold cavity needs to be manufactured by micro-machining technology, and it is very difficult to fill the mold during injection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using tungsten powder, iron powder and nickel powder with an average particle size of less than 20 microns as raw materials, the content of tungsten powder is 88-100%wt, the content of iron powder is 0-6%wt, and the content of nickel powder is 0-6% wt. The three kinds of powders are mixed with the organic mixture, the mixing ratio of the three kinds of powder mixtures and the organic matter is 60:40 by volume, mixed evenly at a temperature of 125-140°C, cooled and crushed, and the injection temperature is 160-175°C, and the injection pressure is Inject under the condition of 30-90MPa to obtain the injection body of the radiator element, immerse in trichlorethylene at a temperature of 10-40°C for 6-12 hours, take it out and dry it, and then heat it up at a rate of 0.5-1.5°C / min Heat to 500-600°C, keep warm for 0.5-1 hour, raise to 700-850°C at a speed of 2-5°C / min, and pre-sinter for half an hour. Move the preformed green body to the sintering furnace, in the flowing am...

Embodiment 2

[0021] Electrolytic copper powder with an average particle size of less than 20 microns is used as the powder raw material, mixed with organic mixture, the ratio of copper powder and organic matter is 45:55 by volume, mixed evenly at a temperature of 125-140°C, cooled and crushed, at the injection temperature Injection under the conditions of 160-175°C and injection pressure of 30-90MPa to obtain the injection green body of the radiator element, immerse in trichlorethylene at a temperature of 10-40°C for 6-12 hours, take it out and dry it, and then Heat at a heating rate of 0.5-1.5°C / min to 500-600°C, and keep warm for 0.5-1 hour. Move the green body to a microwave sintering furnace, use flowing hydrogen as a protective atmosphere, use silicon carbide powder as a sintering medium, heat it to 850 °C at a heating rate of 25 °C / min, and keep it for 20 min. The heat sink obtained under the preparation conditions has a relative density of 94-96.5 percent, a tensile strength of 234-...

Embodiment 3

[0023] Use aluminum nitride ceramic powder with an average particle size of less than 3 microns as raw material, mix with organic mixture, the ratio of aluminum nitride powder and organic matter is 48:52 by volume, mix evenly at a temperature of 125-140°C, cool and crush, Inject at an injection temperature of 160-175°C and an injection pressure of 30-90MPa to obtain an injection body of a radiator element, immerse it in trichlorethylene at a temperature of 10-40°C for 6-12 hours, take it out and dry it , and then heated to 500-600°C at a rate of 0.5-1.5°C / min, held for 0.5-1 hour, raised to 850°C at a rate of 2-5°C / min, and pre-sintered for half an hour. The green body is moved to a microwave sintering furnace, heated to 1550-1750°C at a heating rate of 25°C / min under vacuum state, and kept for 2-6 hours. The relative density of the radiator obtained under the preparation conditions is 95-99%, and the thermal conductivity at room temperature is 180-290W / (m.°C).

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Abstract

The invention relates to a method for preparing a radiator element with a complicated shape, which belongs to the technical field of powder metallurgy technology. The method is characterized by comprising the steps: the mixture of metal or ceramic powder and organic matters is used as a raw material, and the metal or ceramic powder and the organic matter are sufficiently mixed according to a volume ratio from 0.45 to 3.8; mixing is carried out for the mixture at the temperature from 110 DEG C to 145 DEG C for 40 minutes to 90 minutes, and the group components of the organic matters and metal or ceramic powder and the organic matters are sufficiently mixed and pelletized to obtain evenly mixed injection feeding materials; a preforming blank of the radiator element with microstructure is obtained by adopting a powder microinjection forming technology; a degreasing step is carried out through the dissolution of the organic matters in the solvent and the heat dissolving mechanism in a heating process to eliminate the organic matters; and then, the radiator element with the complicated shape is obtained by sintering function. The method overcomes the defects of lower efficiency of machine processing technology, waste of the raw materials and organization aliquation caused by casting and processing, accurately controls the organization, increases the production efficiency and greatly reduces processing cost.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and relates to a powder micro-injection molding technology. Background technique [0002] In recent years, Microsystems Technology (MST) has shown an increasingly important position, which puts forward increasingly urgent requirements for three-dimensional miniature complex components used in micro-engineering. These components include micro-molds, for Micromechanical structures on sensors and accelerators, biosensors, microfluidic elements, microreactors, etc. With the continuous expansion of the field of microstructure, there will be more demand for microstructure parts, and at the same time, it is required to meet the requirements of performance and large-scale production. [0003] However, the development of micro-system technology is restricted by processing, and traditional processing methods are far from competent. Existing micro-processing technologies, such as micro cutting, la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F21/00C04B35/08C04B35/10C04B35/565C04B35/583B22F3/115
Inventor 尹海清刘艳平曲选辉李平秦明礼
Owner UNIV OF SCI & TECH BEIJING
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