阅读说明：本技术 铝金刚石热沉片的制造方法 (Method for manufacturing aluminum diamond heat sink sheet ) 是由 李立 惠新庆 于 2021-06-22 设计创作，主要内容包括：本发明属于电子元器件导热材料制造技术领域,具体地涉及铝金刚石热沉片的制造方法,先将铝粒粉和金刚石粒料按质量比1:1均匀混合,得到铝/金刚石混合料；再将铝/金刚石混合料放入真空感应熔化炉后,在炉内抽真空到0.5Pa时,将氮气充入炉中,使炉压升至10Kpa,然后开启中频电源进行熔炼,熔炼过程中同步进行电磁搅拌,当炉温升至660～700℃时,二次向炉内充入氮气,使炉压升至101KPa,得到铝/金刚石共熔物；分次将铝/金刚石共熔物浇注到铸压机的模具中进行铸压,得到铝金刚石热沉片。本发明提供了一种可高效制备铝金刚石热沉片的制造方法,有利于满足电子元器件轻量化、高导热的加工需求。(The invention belongs to the technical field of manufacturing of heat conducting materials of electronic components, and particularly relates to a manufacturing method of an aluminum diamond heat sink sheet, wherein aluminum particle powder and diamond particles are uniformly mixed according to the mass ratio of 1:1 to obtain an aluminum/diamond mixture; putting the aluminum/diamond mixture into a vacuum induction melting furnace, filling nitrogen into the furnace when the furnace is vacuumized to 0.5Pa to increase the furnace pressure to 10Kpa, then starting a medium-frequency power supply to carry out melting, synchronously carrying out electromagnetic stirring in the melting process, and filling nitrogen into the furnace twice to increase the furnace pressure to 101Kpa when the furnace temperature is increased to 660-700 ℃ to obtain an aluminum/diamond eutectic; and pouring the aluminum/diamond eutectic into a die of a casting press for casting and pressing in multiple times to obtain the aluminum diamond heat-sinking sheet. The invention provides a manufacturing method capable of efficiently preparing an aluminum diamond heat sink sheet, which is beneficial to meeting the processing requirements of light weight and high heat conduction of electronic components.)

1. The manufacturing method of the aluminum diamond heat sink sheet is characterized by comprising the following steps:

1) mixing materials: uniformly mixing the aluminum particle powder and the diamond particles according to the mass ratio of 1:1 to obtain an aluminum/diamond mixture;

2) smelting: putting the aluminum/diamond mixture obtained in the step 1) into a vacuum induction melting furnace, vacuumizing the furnace to 0.5Pa, filling nitrogen into the furnace to increase the furnace pressure to 10Kpa, then starting a medium-frequency power supply to carry out melting, synchronously carrying out electromagnetic stirring in the melting process, and filling nitrogen into the furnace twice to increase the furnace pressure to 101KPa when the furnace temperature is increased to 660-700 ℃ to obtain an aluminum/diamond eutectic;

3) casting and pressing: pouring the aluminum/diamond eutectic obtained in the step 2) into a die of a casting press for casting and pressing in a grading manner to obtain the aluminum diamond heat-sinking sheet.

2. The method for manufacturing an aluminum diamond heat sink sheet according to claim 1, wherein: in the step 1), the granularity of the diamond granules is less than or equal to 500 mu m.

3. The method for manufacturing an aluminum diamond heat sink sheet according to claim 1, wherein: in the step 1), the aluminum particle powder is pure aluminum particle powder or aluminum-silver alloy particle powder, and the particle size of the aluminum particle powder is less than or equal to 500 mu m.

4. The method for manufacturing an aluminum diamond heat sink sheet according to claim 1, wherein: in the step 2), when the nitrogen is charged into the furnace for the second time, the furnace temperature is 680 ℃.

5. The method for manufacturing an aluminum diamond heat sink sheet according to claim 1, wherein: in the step 3), the thickness of the prepared aluminum diamond heat-sinking sheet is 1-5 mm.

Technical Field

The invention belongs to the technical field of manufacturing of heat conducting materials of electronic components, and particularly relates to a manufacturing method of an aluminum diamond heat sink sheet.

Background

With the continuous development of electronic technology, the power density of electronic components is continuously increased, and the generated Heat is more and more, how to improve the continuously increased Heat of electronic components and realize light weight processing has become a technical problem to be solved in the industry, wherein a Heat Sink (Heat Sink) is an important element for solving the problem, and the selection of Heat Sink materials is directly related to the performance of the element, so that the Heat Sink material has become an indispensable loop in the preparation and performance optimization process of electronic components.

The diamond/aluminum composite material not only has the characteristics of high thermal conductivity and low expansion, but also has the density (2.9-3.2 g/cm3) which is far lower than that of other common high thermal conductivity materials, and has wide market prospect in the aspect of electronic component application. Therefore, it is necessary to provide a method for manufacturing an aluminum diamond heat sink sheet to efficiently manufacture the aluminum diamond heat sink sheet, so as to satisfy the processing requirements of light weight and high thermal conductivity of electronic components.

Disclosure of Invention

In order to solve the technical problem, the method for manufacturing the aluminum diamond heat sink sheet provided by the invention comprises the following steps:

1) mixing materials: uniformly mixing the aluminum particle powder and the diamond particles according to the mass ratio of 1:1 to obtain an aluminum/diamond mixture;

2) smelting: putting the aluminum/diamond mixture obtained in the step 1) into a vacuum induction melting furnace, vacuumizing the furnace to 0.5Pa, filling nitrogen into the furnace to increase the furnace pressure to 10Kpa, then starting a medium-frequency power supply to carry out melting, synchronously carrying out electromagnetic stirring in the melting process, and filling nitrogen into the furnace twice to increase the furnace pressure to 101KPa when the furnace temperature is increased to 660-700 ℃ to obtain an aluminum/diamond eutectic;

3) casting and pressing: pouring the aluminum/diamond eutectic obtained in the step 2) into a die of a casting press for casting and pressing in a grading manner to obtain the aluminum diamond heat-sinking sheet.

Preferably, in the step 1), the diamond granules have the grain size of less than or equal to 500 microns, and are convenient to melt and mix.

Preferably, in the step 1), the aluminum particle powder is pure aluminum particle powder or aluminum silver alloy particle powder, and the particle size of the aluminum particle powder is less than or equal to 500 μm, so that the aluminum particle powder is convenient to melt and mix.

Preferably, in the step 2), when the nitrogen is charged into the furnace for the second time, the furnace temperature is 680 ℃, so that aluminum can better fill gaps among diamond particles, and the thermal resistance of the material is reduced.

Preferably, in the step 3), the thickness of the prepared aluminum diamond heat sink sheet is 1-5 mm, so that secondary processing can be conveniently carried out according to the processing requirements of electronic components.

The invention also comprises other steps which can lead the preparation method of the composite heat radiation body to be normally used, and all the steps are conventional technical means in the field. In addition, the technical means which are not limited in the invention adopt the conventional technical means in the field.

The working principle of the invention is that the aluminum/diamond mixture is rapidly smelted in a vacuum induction melting furnace under the inert atmosphere and the high temperature condition of 660-700 ℃, the bonding strength of aluminum and diamond is improved, the bonding gap between aluminum and diamond is reduced, the thermal resistance of the material is reduced, the aluminum/diamond eutectic is poured into a die of a casting press for casting and pressing, the forming is rapid, the energy consumption is less, and the processing efficiency of the aluminum diamond hot sinking piece is favorably improved.

Compared with the prior art, the invention has the following beneficial effects: the manufacturing method for the aluminum diamond heat sink sheet can be used for efficiently preparing the aluminum diamond heat sink sheet, and is beneficial to meeting the processing requirements of light weight and high heat conductivity of electronic components.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic process flow diagram of the present invention.

Detailed Description

The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which some embodiments of the invention are shown and described, but are not intended to limit the invention. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.

Examples

Referring to fig. 1, the method for manufacturing the aluminum diamond heat sink sheet according to the present invention comprises the following steps:

1) mixing materials: uniformly mixing aluminum particle powder with the particle size of less than or equal to 500 mu m and diamond granules according to the mass ratio of 1:1 to obtain an aluminum/diamond mixture, wherein the aluminum particle powder is aluminum-silver alloy particle powder.

2) Smelting: putting the aluminum/diamond mixture obtained in the step 1) into a vacuum induction melting furnace, vacuumizing the furnace to 0.5Pa, filling nitrogen into the furnace to increase the furnace pressure to 10Kpa, then starting a medium-frequency power supply to carry out melting, carrying out electromagnetic stirring synchronously in the melting process, and filling nitrogen into the furnace twice to increase the furnace pressure to 101KPa when the furnace temperature is increased to 680 ℃ to obtain an aluminum/diamond eutectic;

3) casting and pressing: pouring the aluminum/diamond eutectic obtained in the step 2) into a die of a casting press for casting and pressing in multiple times to obtain the aluminum diamond heat-sinking sheet with the thickness of 5 mm.

The working principle of the invention is that the aluminum/diamond mixture is rapidly smelted in a vacuum induction melting furnace under the conditions of inert atmosphere and high temperature of 680 ℃, the bonding strength of aluminum and diamond is improved, the bonding gap between aluminum and diamond is reduced, the thermal resistance of the material is reduced, the aluminum/diamond eutectic is poured into a die of a casting press for casting, the forming is rapid, the energy consumption is less, and the processing efficiency of the aluminum diamond hot-sink piece is favorably improved.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.