TWI640495B - Composite component, use and manufacturing method of the same - Google Patents

Abstract

Composite member, manufacturing method thereof, and manufacturing method thereof, the method for manufacturing the composite member comprises the steps of: (a) providing a plurality of aluminum metal powders and a plurality of tantalum carbide powders, the purity of the aluminum metal powders and the tantalum carbide powder More than 99.5%; (b) the aluminum metal powder and the niobium carbide powder are subjected to a wet mixing process in an organic vehicle to form a slurry; (c) drying the slurry to form a plurality of An aluminum-cerium carbide composite powder; and (d) a molding and densification process of the aluminum-cerium carbide composite powder and a metal foil to form the composite member. The composite member can be applied as an element that dissipates heat, resists electromagnetic interference, or a combination thereof.

Description

Composite member, use thereof and manufacturing method

The present invention relates to a composite member, and more particularly to a composite member in which a metal foil and a tantalum carbide powder are composited together, and a use and a production method thereof.

Due to the high integration and miniaturization of electronic components, high-heat output is accompanied by the operation of electronic components. How to effectively dissipate heat from electronic components to avoid damage to components has become an important issue in system design. Among them, the use of heat dissipation materials to increase the heat dissipation area and efficiency is the most common and basic method in thermal management technology. For example, metal materials with high thermal conductivity, such as aluminum (thermal conductivity ~200W/m.K) and copper (thermal conductivity ~400W/m.K), are the most commonly used heat-dissipating materials, but aluminum (thermal expansion coefficient ~ 23ppm/K), copper (thermal expansion coefficient ~16ppm/K) has a very high thermal expansion coefficient, and the semiconductor material (thermal expansion coefficient ~5ppm/K) is very different, so that the above metal materials can be used for heat dissipation of semiconductor components. Thermal stress causes damage to the component.

Nowadays, new heat-dissipating materials with higher thermal conductivity, adjustable thermal expansion coefficient and lower specific gravity have been developed. For example, aluminum-deuterated composite materials can be used in various heat-dissipating applications, for example, for electronic applications. Component and microprocessor assembly and heat dissipation materials, printed circuit boards, LED and IGBT heat sink substrates, mobile phone casings, etc.

For example, the Republic of China Announcement No. I357788 invention patent case discloses a dip The aluminum-carbonized composite material is produced by the staining method, that is, the carbonized niobium preform having a porosity and a relative density of only 55 to 75% is first prepared, and then the aluminum or aluminum alloy is pressed into the niobium carbide preform by a high pressure method. in. However, since the melting point of niobium carbide is 2830 ° C, it is difficult to produce a porous niobium carbide preform having a certain strength, so it is necessary to add some ceramic additives to assist sintering, but this will reduce the heat conduction of niobium carbide. In addition, the porous preform partially forms closed pores, which causes the aluminum or aluminum alloy to be indented, resulting in a lower density of the aluminum-carbonized composite material.

In view of the above, it is necessary to provide a method for producing aluminum-carbonized tantalum which is different from the prior art to solve the problems of the conventional technology.

An object of the present invention is to provide a composite member in which an aluminum-cerium carbide composite powder and a metal foil are integrally formed and densified, and it is possible to improve the thermal conductivity without pre-fabricating a tantalum carbide preform for pressing into a metal material. density.

A second object of the present invention is to provide a composite member for integrally forming and densifying an aluminum-cerium carbide composite powder and a metal foil, which can be used for manufacturing an element having electromagnetic interference resistance and heat dissipation function.

A further object of the present invention is to provide a method for fabricating a composite member by integrally forming and densifying an aluminum-cerium carbide composite powder and a metal foil, without pre-fabricating a tantalum carbide preform for pressing into a metal material. Simplify the production process.

In order to achieve the above object, the present invention provides a method for fabricating a composite member, which may include the steps of: (a) providing a plurality of aluminum metal powders and a plurality of tantalum carbide powders, the aluminum metal powders and the tantalum carbide powder The purity is greater than 99.5%; (b) the aluminum metal powder and the tantalum carbide powder are subjected to a wet mixing process in an organic carrier to form a slurry; (c) drying the slurry to form a plurality of One An aluminum-cerium carbide composite powder; and (d) a molding and densification process of the aluminum-cerium carbide composite powder and a metal foil to form the composite member.

In an embodiment of the invention, in step (a), the aluminum metal powder may be spherical or spheroidal.

In an embodiment of the invention, in step (a), the niobium carbide powder may be in an irregular shape.

In an embodiment of the present invention, in the step (a), the aluminum metal powder may be greater than 20% by weight, and the cerium carbide powder may be made up to 100%.

In an embodiment of the present invention, in the step (a), the niobium carbide powder may be tantalum carbide ceramic powder.

In an embodiment of the present invention, in the step (b), the organic vehicle may be selected from the group consisting of diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, terpineol, ethanol and isopropanol. One kind.

In an embodiment of the invention, in step (b), an operation time of the wet mixing program may be from 0.5 to 4 hours.

In an embodiment of the invention, in step (c), the slurry is dried by vacuum drying.

In an embodiment of the present invention, in the step (c), an operating temperature of the vacuum drying method may be 80 to 250 ° C, and an operation time of the vacuum drying method may be 0.5 to 4 hours.

In an embodiment of the invention, in step (c), the vacuum drying method may have a degree of vacuum of less than 760 Torr.

In an embodiment of the invention, in step (d), the metal foil may be made of aluminum, Made of copper, silver, gold or alloys thereof.

In an embodiment of the invention, in step (d), a thickness of the metal foil may be selected from 0.01 to 1 mm.

In an embodiment of the invention, in step (d), the forming and densification procedure can be a hot press.

In an embodiment of the invention, in step (d), the forming and densification process can be combined with an inert gas sintering process using a dry press process.

In an embodiment of the invention, in step (d), the inert gas used in the inert gas sintering process may be argon or nitrogen.

In an embodiment of the invention, in step (d), an operating temperature of the forming and densification procedure may be from 500 to 650 ° C, and an operation time of the forming and densification procedure may be from 1 to 4 hours.

In an embodiment of the invention, in step (d), at least a portion of the foil of the composite member may be exposed.

In order to achieve the above object, the present invention further provides a composite member which can be produced by the method for producing a composite member as described above.

In order to achieve the above object, the present invention further provides a use of a composite member which can be applied as an element having heat dissipation, electromagnetic interference resistance or a combination thereof.

1‧‧‧Composite components

11a‧‧‧Aluminum metal powder

11b‧‧‧Carbide powder

12‧‧‧Sheet

S1‧‧‧ steps

S2‧‧‧ steps

S3‧‧‧ steps

S4‧‧‧ steps

Fig. 1 is a flow chart showing a method of fabricating a composite member according to an embodiment of the present invention.

Fig. 2 is a partially enlarged cross-sectional view showing the composite member of the embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; Furthermore, the directional terms mentioned in the present invention, such as upper, lower, top, bottom, front, rear, left, right, inner, outer, side, surrounding, central, horizontal, horizontal, vertical, longitudinal, axial, Radial, uppermost or lowermost, etc., only refer to the direction of the additional schema. Therefore, the directional terminology used is for the purpose of illustration and understanding of the invention.

Referring to FIGS. 1 and 2, steps S1 to S4 of the method for fabricating a composite member according to an embodiment of the present invention are as follows, but are not limited thereto.

In step S1, a plurality of aluminum metal powders 11a and a plurality of tantalum carbide powders 11b are provided, and the purity of the aluminum metal powders 11a and the tantalum carbide powders 11b is greater than 99.5%. In one embodiment, the aluminum metal powder 11a and the tantalum carbide powder 11b may have a purity greater than 99.7%; the aluminum metal powder 11a may have a particle diameter of 1 to 10 micrometers (μm), and the tantalum carbide powder 11b may have a particle size of 1 to 15 micrometers; the aluminum metal powder 11a may be spherical or spheroidal, and the tantalum carbide powder 11b may have an irregular shape, for example, the tantalum carbide powder may be tantalum carbide ceramic powder or the like. The weight percentage of the aluminum metal powder 11a may be greater than 20%, and the remaining weight percentage may be the content of the tantalum carbide powder 11b for better production results.

In step S2, the aluminum metal powder 11a and the niobium carbide powder 11b are subjected to a wet mixing process in an organic vehicle to form a slurry. In one embodiment, the organic vehicle may be selected from the group consisting of butyl carbitol, butyl carbitol acetate, terpineol, and ethanol. And one of isopropanol; the wet mixing procedure can be operated for 0.5 to 4 hours to achieve better production results.

In step S3, the slurry is dried to form a plurality of aluminum-carbonium carbide composite powders. in In one embodiment, the slurry may be dried by a vacuum drying method, for example, an operating temperature of the vacuum drying method may be 80 to 250 ° C, and an operation time of the vacuum drying method may be 0.5 to 4 hours, the vacuum drying The vacuum of the method can be less than 760 torr to achieve better production results.

In step S4, the aluminum-cerium carbide composite powder and a metal foil 12 are subjected to a molding and densification process to form the composite member 1. In an embodiment, the metal foil 12 may be made of a highly thermally conductive metal. For example, the metal foil 12 may be made of aluminum, copper, silver, gold or an alloy thereof, but not limited thereto; A thickness may be selected from 0.01 to 1 millimeter (mm); the forming and densification procedure may be a hot pressing, or a die forming may be used in conjunction with an inert gas sintering process (sintering) For example, the inert gas used in the inert gas sintering process may be argon or nitrogen; an operating temperature of the molding and densification procedure may be 500 to 650 ° C, and an operation time of the molding and densification procedure may be 1 to 4 hours; at least a portion of the metal foil 12 of the composite member 1 (such as a smooth surface) may be exposed for attaching a heat generating material such as various data processing components for use in optoelectronics, semiconductors, and computers. , mobile communications and other industries. The following is an example of the embodiments of the present invention, but is not limited thereto.

Example 1: This example is exemplified by the fabrication of a metal aluminum foil composite aluminum-carbonium carbide heat dissipating member. First, according to the weight percentage of 60% aluminum and 40% niobium carbide, an aluminum metal powder (average particle diameter of 6 μm) having a purity of 99.7% or more and a niobium carbide powder having an purity of 99.9% or more (average particle diameter) are provided. It is 10 microns). Next, the aluminum metal powder and the niobium carbide powder were placed in an organic vehicle of diethylene glycol monobutyl ether to carry out the wet mixing procedure, and the operation time was 4 hours.

Then, the uniformly mixed aluminum-carbonized tantalum slurry is placed in a vacuum oven, and a vacuum drying process is performed under a vacuum of 76 torr, wherein the drying temperature is 160 ° C. When the drying time is 4 hours, an aluminum-cerium carbide composite powder can be obtained.

Finally, a pure aluminum foil having a thickness of 0.01 mm (mm) is placed in a dry pressing mold, and then the aluminum-cerium carbide composite powder is poured into the dry pressing mold for molding, and then the formed aluminum foil-aluminum-carbonized crucible is formed. The embryo body is fired into an aluminum-aluminum-carbonium carbide heat-dissipating member by a normal pressure sintering method at 600 ° C for 2 hours under a nitrogen atmosphere. The heat dissipating member has a thickness of 3.5 mm, a relative density of 98.7%, and a thermal conductivity of 200 W/m. K, thermal expansion coefficient is 11.9ppm / K.

Example 2: This example is exemplified by the production of a metal copper foil composite aluminum-carbonium carbide heat dissipating member. First, according to the weight percentage of 50% aluminum and 50% niobium carbide, an aluminum metal powder (average particle diameter of 10 μm) having a purity of up to 99.7% or more and a niobium carbide powder having a purity of 99.9% or more are provided (average particle diameter) It is 15 microns). Next, the aluminum metal powder and the niobium carbide powder were placed in an organic vehicle of ethanol to carry out the wet mixing procedure, and the operation time was 1 hour.

Then, the uniformly mixed aluminum-carbonized tantalum slurry was placed in a vacuum oven, and a vacuum drying process was performed under a vacuum of 190 torr, wherein the drying temperature was 80 ° C and the drying time was 2 hours. An aluminum-carbonium ruthenium composite powder can be obtained.

Finally, a copper foil having a thickness of 0.03 millimeters (mm) is placed in a graphite mold (hot press mold), and then the aluminum-carbon tantalum composite powder is poured into the hot press mold by hot pressing at 550 ° C. The copper foil and the aluminum-carbonized niobium powder were pressed into a copper-aluminum-carbonized niobium heat-dissipating member under the condition of holding for 2 hours, and the heat-dissipating member had a thickness of 3.5 mm, a relative density of 99.4%, and a thermal conductivity of 187 W/ m. K, thermal expansion coefficient is 9.7ppm / K.

The manufacturing method of the composite member according to the above embodiment of the present invention is characterized in that: The metal foil having high thermal conductivity is compounded with the aluminum-cerium carbide powder to form a dense metal-aluminum-cerium carbide composite member. Since the outer layer of the composite member has a high thermal conductivity metal material, it can provide a smooth surface having both workability, heat dissipation and electromagnetic interference resistance (EMI) function; the inner layer of the composite member is a high thermal conductivity aluminum a niobium carbide composite, and the ratio of the aluminum-niobium carbide can be varied to adjust the coefficient of thermal expansion of the composite member.

Compared with the prior art impregnation method, the composite member of the above embodiment of the present invention is formed by integrally forming and densifying the aluminum-cerium carbide composite powder and the metal foil without pre-fabricating the tantalum carbide preform for pressing. Into the metal material to simplify the production process. Moreover, the manufacturing method can be directly applied to the manufacture of components having heat dissipation, electromagnetic interference resistance or a combination thereof in industries such as optoelectronics, semiconductors, computers, and mobile communication.

The manufacturing method of the composite member according to the above embodiment of the present invention can be used to provide a composite member which is made by the manufacturing method of the composite member as described above; the composite member can be applied as a heat dissipation and electromagnetic interference resistance. Or an element of its combined function, the implementation of which has been described above, and will not be described herein.

The present invention has been disclosed in its preferred embodiments, and is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

Claims (9)

A method for manufacturing a composite member, comprising the steps of: (a) providing a plurality of aluminum metal powders and a plurality of tantalum carbide powders, the aluminum metal powder and the tantalum carbide powder having a purity greater than 99.5%; (b) The aluminum metal powder and the tantalum carbide powder are subjected to a wet mixing process in ethanol for 1 hour to form a slurry; (c) drying the slurry in a vacuum of 190 Torr Performing a vacuum drying process at a drying temperature of 80 ° C and a drying time of 2 hours to form a plurality of aluminum-cerium carbide composite powders; and (d) forming the aluminum-cerium carbide composite powder and a copper foil The densification procedure was carried out by hot pressing at a temperature of 550 ° C and holding for 2 hours. The method for producing a composite member according to claim 1, wherein in the step (a), the aluminum metal powder system is spherical or spheroidal. The method for producing a composite member according to claim 1, wherein in the step (a), the tantalum carbide powder system has an irregular shape. The method for producing a composite member according to claim 1, wherein in the step (a), the aluminum metal powder is greater than 20% by weight, and the cerium carbide powder is made up to 100%. The method for producing a composite member according to claim 1, wherein in the step (a), the tantalum carbide powder is a tantalum carbide ceramic powder. The method for fabricating a composite member according to claim 1, wherein in the step (d), a thickness of the copper foil is selected to be 0.03 mm. The method of manufacturing a composite member according to claim 1, wherein in the step (d), at least a portion of the copper foil of the composite member is exposed. A composite member produced by the method for producing a composite member according to any one of claims 1 to 7. A use of the composite member according to claim 8 is applied as an element having heat dissipation, electromagnetic interference resistance or a combination thereof.