TWI575079B - Composition of high heat dissipating aluminum and its manufacturing method - Google Patents

Description

Composition of high heat dissipation aluminum member and manufacturing method thereof

The invention relates to a composition of a high heat dissipation aluminum member and a manufacturing method thereof, in particular to a joint of pure aluminum and graphite, so that the aluminum component has the advantages of high heat dissipation and low loss.

It is known that aluminum is widely used in industry, and because of its good thermal conductivity, it is used in a large number of heat sink materials, and it can also increase the heat dissipation performance of aluminum heat sinks, often using other processing methods (for example: mold casting) Formed or cut into a fin shape or other shape to increase its contact area to improve heat dissipation; in fact, the above has the following shortcomings:

1. Although aluminum has good heat absorption, heat conduction and heat dissipation performance, its thermal conductivity is not the most ideal heat conduction and heat dissipation material because its material is fixed.

2. In order to increase the contact area, the aluminum sheet can increase the heat dissipation efficiency, but the relative need to increase the processing cost is a big problem in the heat dissipation application of aluminum sheet.

In addition, the industry has aluminum and graphite fusion, so that aluminum has a high thermal conductivity of heat dissipation, but the melting point of aluminum is about 660 degrees Celsius, graphite will begin to oxidize below 500 degrees Celsius, the hot melt aluminum and graphite directly mixed, During the mixing and mixing process, when the graphite is in contact with air, the gasification reaction is too fast, and the graphite is gradually oxidized due to the high temperature, causing a large amount of graphite loss, which makes the manufacturing cost too high and is difficult to be practical.

The main object of the present invention is to solve the above problems, and to provide a composition of a high heat dissipation aluminum member and a manufacturing method thereof, which have better practical effects, and the main techniques and purposes are as follows: The pure aluminum is heated and melted into a pure aluminum melt, and the aluminum carbide ingot is poured into the pure aluminum melt to be continuously stirred until the aluminum carbide ingot is completely melted; and the molten mixture is introduced into the mold to be naturally cooled to a normal temperature and cooled to form; The composition of the aluminum component containing graphite has the characteristics of high thermal conductivity and heat dissipation by the characteristics of graphite, and the graphite has a low loss effect by secondary fusion of graphite and aluminum.

Figure 1 is a flow chart of the manufacturing method of the present invention

In order to make the present invention more familiar with the present invention, a preferred embodiment and a drawing will be described in detail as follows: a composition of a high heat dissipation aluminum member comprising: 20% to 25% by weight pure The aluminum and the weight percentage are composed of 75% to 80% of aluminum carbide ingot; wherein the aluminum carbide ingot is made of graphite and aluminum powder, and the weight percentage thereof is as follows: graphite: 60%, aluminum powder: 40%.

Please refer to FIG. 1 , a method for manufacturing a high heat dissipation aluminum member, the steps comprising: (a) preparing a powdery weight percentage of 60% graphite and a weight percentage of 40% aluminum powder in a vacuum drum heating furnace, and adding 10 atmospheres of nitrogen gas. Press and heat to 680 ° C; (b) continue to stir for 6-8 hours, so that the melting point of molten aluminum powder can be sintered with the graphite into aluminum carbide powder, which is placed in the mold and stamped at 200 ~ 300 metric tons a high-density aluminum carbide ingot; (c) preparing pure aluminum and heating to 680 ° C to form a melt, and injecting the aluminum carbide ingot into the pure aluminum melt, and respectively, by weight of 20% to 25% pure aluminum and weight The mixing ratio of the percentage of 75% to 80% of the aluminum carbide ingot is continuously stirred until the aluminum carbide ingot is completely melted into the pure aluminum melt; and (d) the pure aluminum melt mixed with the aluminum carbide ingot is introduced into the mold and is naturally Drop to normal temperature and cool down By the above method, a composition of aluminum containing graphite is obtained and fused in two times, so that the aluminum component has the effects of high heat dissipation and low loss of graphite.

The composition of the present invention is described in detail as follows: As shown in Fig. 1, a flow chart of the manufacturing method of the present invention is a method in which powdered graphite is first dried (the graphite is in the form of a block and needs to be ground into water prior to water, in water). The grinding system avoids the violent oxidation of the powdered graphite), and then the powdered graphite is placed in an electric vacuum heating furnace for heating, and dried at 180 ° C to 220 ° C, and the heating time takes 5-7 hours to make the powdery graphite dry. (Drying the non-aqueous powdered graphite to avoid the subsequent combustion with aluminum powder, and supporting it due to water content), and then placing it in a vacuum drum heating furnace with 60% by weight of graphite and 40% by weight of aluminum powder. Heating it to 680 ° C, and applying nitrogen gas at 10 atmospheres, the pressure of the vacuum drum heating furnace is increased, and the increase of the pressure in the furnace will further increase the temperature in the vacuum drum heating furnace, and also the non-combustion of nitrogen gas. The characteristic is that the vacuum drum is heated in the furnace without the help of the gas, so that the powdery graphite and the aluminum powder are not oxidized to produce a qualitative change; and the heating is continuously maintained to maintain the temperature and the rolling and stirring is continued for 8 hours during the period, the powdery graphite and the powdery graphite The powder will be sintered into aluminum carbide powder. After the aluminum carbide powder is naturally lowered to normal temperature, the aluminum carbide powder is placed in a stamping die and punched into an aluminum carbide ingot from 200 metric tons to 300 metric tons, which is subjected to high pressure stamping of aluminum carbide. The density of the ingots will increase dramatically.

Then, the pure aluminum (ingredients are pure aluminum blocks) is heated at a normal temperature and normal temperature higher than the melting point of the aluminum 680 ° C in a pure aluminum melt state, and the aluminum carbide ingot is put into the pure aluminum melt, and respectively, by weight percentage The proportion of 20%~25% pure aluminum and 75%~80% by weight of aluminum carbide ingot is continuously stirred, and the high-density aluminum carbide ingot will slowly melt in the pure aluminum melt, so that the melting speed is too fast. When the graphite is brought into contact with air, the gasification reaction is too fast, and the graphite is excessively depleted; the loss of graphite produced by the manufacturing method of the present invention is less than 5% of the total weight; for example, 300 kg (% by weight: 23%) ) 1000 kg of aluminum carbide ingot (weight percentage: 77%) is put into pure aluminum melt. The finished product is about 1,250 kg (loss is about 3.8% by weight of total weight), and the aluminum carbide ingot in the pure aluminum melt is completely melted and completely mixed with the aluminum melt, and then the mixed melt is poured into the mold, and the mixture is poured into the mold. The cooling is caused by normal temperature, and a composition of an aluminum member can be obtained. The proportion of graphite contained in the aluminum component can make the stress intensity stronger than that of pure aluminum; and the aluminum component has high heat conduction and heat dissipation characteristics. .

However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the features of the present invention. The re-creation of the technical means and the creation principle of the present invention is still an equivalent structural idea of the present invention. category.

In summary, the structure of the present invention is extremely industrially useful; and it has not been found that the same or similar inventions appear in domestic and foreign publications or in public use, and indeed have excellent practicality and enhanced efficacy, and are in line with patents. The provisions of the law, the application of the law.

Claims (4)

A method for manufacturing a high heat dissipation aluminum member, comprising the steps of: (a) preparing a powdery weight percentage of 60% graphite and a weight percentage of 40% aluminum powder in a vacuum drum heating furnace, and injecting nitrogen gas pressure and heating to 680 ° C; Continuously stirring for 6-8 hours, so that the melting point of the molten aluminum powder can be sintered with the graphite into aluminum carbide powder, and the aluminum carbide powder is placed in a mold and punched into a high-density aluminum carbide ingot at 200 to 300 metric tons; c) preparing pure aluminum and heating to 680 ° C to obtain a slurry, and injecting the aluminum carbide ingot into the pure aluminum melt, and respectively, using 20% to 25% pure aluminum by weight and 75% to 80% by weight of aluminum carbide ingot The mixing ratio is continuously stirred until the aluminum carbide ingot is completely melted into the pure aluminum melt; and (d) the pure aluminum melt mixed with the aluminum carbide ingot is introduced into the mold and naturally cooled to a normal temperature and cooled; In the above method, a composition of aluminum containing graphite is obtained and fused in two times, so that the composition of the aluminum member has high heat conduction, heat dissipation and low loss of graphite. A method of manufacturing a high heat dissipation aluminum member according to claim 1, wherein the nitrogen gas is injected at 10 atmospheres. A composition of a high heat dissipation aluminum member manufactured by the manufacturing method of claim 1, comprising: 20% to 25% by weight of pure aluminum and 75% to 80% by weight of aluminum carbide ingot. The composition of the high heat dissipation aluminum member according to claim 3, wherein the aluminum carbide ingot is a mixture of graphite and aluminum powder, and the weight percentage thereof is as follows: graphite: 60%, aluminum powder: 40%.