Method for preparing composite material in symmetrical gradient between metallic material and ceramic material

A technology of composite materials and ceramic materials, applied in the direction of chemical instruments and methods, conductive materials, conductive materials, etc., can solve problems such as poor wettability, difficult processing of gradient materials, and large difference in sintering temperature, so as to solve the problems of difficult combination, Good electrical conductivity, realize the effect of high temperature difference

Inactive Publication Date: 2007-02-21
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

However, due to the large difference in sintering temperature between aluminum nitride ceramics and metal copper (greater than 650 ° C), in addition, the wettability of metal copper on the surface of aluminum nitride is not good, which brings difficulties to the gradient material processing of metal copper and aluminum nitride. very difficult

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  • Method for preparing composite material in symmetrical gradient between metallic material and ceramic material
  • Method for preparing composite material in symmetrical gradient between metallic material and ceramic material
  • Method for preparing composite material in symmetrical gradient between metallic material and ceramic material

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[0017] The invention provides a method for preparing a symmetrical gradient composite material of metal material and ceramic material. Take the preparation method of cermet functionally graded composite material (copper (Cu) / aluminum nitride (AlN) / copper (Cu)) as an example. The symmetric pore gradient material of multilayer aluminum nitride ceramics is prepared first, and before sintering, it is necessary to add the mass percentage of coarse powder aluminum nitride to the coarse powder aluminum nitride in the process of preparing the symmetric pore gradient material of aluminum nitride ceramics. 2-10% copper powder; then metal copper is infiltrated into the pores of the porous aluminum nitride layer on the outer layer of the symmetrical pore gradient material of aluminum nitride ceramics to achieve the purpose of layered and gradient composite. Its process (such as figure 1 shown) is:

[0018] 1) Preparation of powder raw materials: use two kinds of aluminum nitride powders...

Embodiment 1

[0025] Two kinds of aluminum nitride powders are used, the particle size is 2.20-2.45 microns, 0.97 grams of fine aluminum nitride powder with a purity of 99.9%, and 0.03 grams of calcium fluoride powder with a purity of 99.99% are mixed evenly with a grinding bowl. Then take 0.776 grams of coarse aluminum nitride powder with a particle size of 10-26 microns and a purity of more than 99%, and 0.024 grams of the same calcium fluoride, and mix them uniformly with a grinding bowl to prepare two parts in total. In addition, 2.5 grams of metal copper powder was weighed, and two parts were weighed in total.

[0026] According to the order of coarse powder aluminum nitride / fine powder aluminum nitride / coarse powder aluminum nitride, press into a 20mm diameter graphite mold for spark plasma sintering, put it into a spark plasma sintering furnace after compaction, and pressurize to 40Mpa , evacuate to less than 7Pa, and measure the temperature with an infrared thermometer. The heating...

Embodiment 2

[0031] Two kinds of aluminum nitride powders are used, the average particle size is 2.35 microns, and the purity is 99.9%. Weigh 0.97 g of fine powdered aluminum nitride, and mix evenly with 0.03 g of calcium fluoride with a purity of 99.99% in a mortar. Add 8% copper powder and 3% calcium fluoride by mass percentage to 30.25 micron, 99.9% pure powdered aluminum nitride, and ball mill with a planetary mill at a speed of 200r / min for 1.5 hours. Afterwards, the ball-milled coarse aluminum nitride powder and the fine aluminum nitride powder added with calcium fluoride were mixed evenly in the ratio of 1:1 and 4:1 respectively, each weighing 0.3 g, and each proportion was divided into 2 parts. Take by weighing 2.5 grams of metal copper powder, and take two parts altogether.

[0032] According to coarse aluminum nitride / coarse aluminum nitride + 20% fine aluminum nitride / coarse aluminum nitride + 50% fine aluminum nitride / fine aluminum nitride / coarse aluminum nitride + 50% f...

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Abstract

This invention discloses a method for preparing symmetric gradient metal/ceramic composite. The method comprises: (1) sintering aluminum nitride ceramic at a low temperature by plasma-discharging sintering; (2) adding an appropriate amount of Cu powder into aluminum nitride coarse powder to improve its surface property; (3) preparing aluminum nitride symmetric porous gradient material, and infiltrating Cu into it at a low temperature. The method solves the problem of poor bonding between Cu and aluminum nitride ceramic, and can realize preparation of gradient composite with high temperature difference and poor compatibility. The composite has good insulation and thermal conductivity in the thickness direction and good planar electric conductivity, thus can be used as electric heater.

Description

technical field [0001] The invention belongs to the technology of functionally graded composite materials, in particular to a method for preparing a symmetrically graded composite material (Cu / AlN / Cu) of metal materials and ceramic materials. Background technique [0002] Thermoelectric power generation devices have received great attention in recent years due to the advantages of no mechanical movement, long-term operation without manual maintenance, and low-grade heat sources such as waste heat and solar energy for power generation. Its electrode material is one of the key technologies for developing high-performance thermoelectric power generation devices. The electrodes of thermoelectric devices need to have good electrical conductivity and connectivity in the plane direction, but good electrical insulation and high thermal conductivity in the thickness direction, so as to realize the series connection of multiple sets of thermoelectric P-N junctions. The material desig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05H01B1/00B32B15/00
Inventor 李敬锋张怀全
Owner TSINGHUA UNIV
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