Cu-Ti2 AlC functionally gradient material and preparation method thereof

A functionally graded material, gradient distribution technology, applied in chemical instruments and methods, layered products, metal layered products, etc., to achieve high melting point, prolong service life, and overcome the effects of corrosion resistance

Inactive Publication Date: 2013-05-08
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing technology has not combined Cu and Ti 2 Bibliographical reports on the preparation of functionally graded composites by hot pressing and sintering AlC

Method used

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  • Cu-Ti2 AlC functionally gradient material and preparation method thereof
  • Cu-Ti2 AlC functionally gradient material and preparation method thereof
  • Cu-Ti2 AlC functionally gradient material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking the 4-layer gradient change as an example, Cu and Ti 2 The total volume of AlC is calculated as 100%, Cu and Ti in the gradient distribution layer 2 The volume fraction of AlC is shown in Table 1:

[0024] Table 1 Cu and Ti in gradient distribution layer 2 Volume percentage of AlC

[0025] raw material Tier 1 layer 2 layer 3 layer 4 Cu 100% 80% 60% 40% Ti 2 AlC 0 20% 40% 60%

[0026] Weigh Cu and Ti respectively in proportion 2 After the AlC powder is mixed, it is ball milled with alcohol for 4 hours to mix evenly, and it is loaded into a graphite grinding tool layer by layer to form a gradient distribution layer, and it is hot-pressed and sintered in a vacuum environment. The heating rate is 8°C / min, the sintering temperature is 850°C, the pressure is 30MPa, and the temperature is kept for 1.5 hours. The relative density of the obtained sintered body is 97%, and the resistivity is less than 2.0*10 -7 Ω m, change of ...

Embodiment 2

[0028] Taking the 4-layer gradient change as an example, Cu and Ti 2 The total volume of AlC is calculated as 100%, Cu and Ti in the gradient distribution layer 2 The volume fraction of AlC is shown in Table 2:

[0029] Table 2 Cu and Ti in gradient distribution layer 2 Volume percentage of AlC

[0030] raw material Tier 1 layer 2 layer 3 layer 4 Cu 97% 70% 50% 30% Ti 2 AlC 3% 30% 50% 70%

[0031] Weigh Cu and Ti respectively in proportion 2 After the AlC powder is mixed, it is ball-milled with alcohol as the medium for 6 hours to mix evenly, and it is loaded into the graphite grinding tool layer by layer to form a gradient distribution layer, and it is hot-pressed and sintered under the Ar atmosphere. The heating rate is 10°C / min, the sintering temperature is 930°C, the pressure is 35MPa, and the temperature is kept for 2 hours. The relative density of the obtained sintered body is greater than 98%, and the resistivity is less tha...

Embodiment 3

[0033] Taking the 5-layer gradient change as an example, Cu and Ti 2 The total volume of AlC is calculated as 100%, Cu and Ti in the gradient distribution layer 2 The volume fraction of AlC is shown in Table 3:

[0034] Table 3 Cu and Ti in gradient distribution layer 2 Volume percentage of AlC

[0035] raw material Tier 1 layer 2 layer 3 layer 4 layer 5 Cu 95% 80% 60% 40% 20% Ti 2 AlC 5% 20% 40% 60% 80%

[0036] Weigh Cu and Ti respectively in proportion 2 After the AlC powder is mixed, it is ball-milled with alcohol as the medium for 8 hours to mix evenly, and it is loaded into the graphite grinding tool layer by layer to form a gradient distribution layer, and it is hot-pressed and sintered in a vacuum environment. The heating rate is 10°C / min, the sintering temperature is 950°C, the pressure is 40MPa, and the temperature is kept for 2 hours. The relative density of the obtained sintered body reaches more than 98%, and the r...

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Abstract

The invention relates to a preparation method of a Cu-Ti2 AlC functionally gradient material. The preparation method is characterized in that a composite material which contains pure Cu or main ingredient Cu is formed at one side of the prepared gradient material; the compound which contains pure Ti2AlC or main ingredient Ti2AlC is arranged at the other side of the prepared gradient material; 1-4 interlayers are arranged; the contents of Cu and Ti2AlC change in gradient along with the thickness direction, and gradually change along with the performance; the hardness and strength of the material are obviously improved along with the direction from Cu to enriched Ti2AlC; the oxidation resistance and the anti-high temperature performance are improved; the wear-resisting property and the elastic modulus are gradually improved; and the toughness, the electric conductivity and the thermal conductivity are obviously improved along the direction from Ti2AlC to enriched Cu. The material has significance as to a special environment which has different operational performances as to different contact surfaces; the material is prepared from Cu and Ti2AlC powder used as raw materials in a manner of hot-pressed sintering under certain atmosphere after evenly mixing and layered charging, wherein the sintering temperature is 800-1000 DEG C; the heating rate is 8-20 DEG C/min; the pressure is 20-40 MPa; and heat preservation time is 0.5-3 hours. By adopting a hot-pressed sintering method, the prepared gradient material is high in compactness, excellent in performance, and good in industrialized prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of gradient composite materials, and in particular relates to a method for preparing dense metal / ceramic functionally graded materials using vacuum hot pressing technology, in particular to a Cu-Ti2AlC functionally graded material and a preparation method thereof. technical background [0002] At present, the commonly used conductive functional materials in industry are silver-based composite materials, but silver metal is an expensive rare metal, and its consumption is increasing year by year. According to the report prepared by the US GFMS for the World Silver Association in 2011, only electrical and The industry's demand for silver is 7555.21 tons. Therefore, reducing the consumption of silver metal is a very important task. Due to the high conductivity of Cu, the industry generally seeks to replace Ag with Cu. As a conductive and thermally conductive functional material, copper is widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B18/00B32B15/04
Inventor 陈艳林曾成文严明熊焰李宗育
Owner HUBEI UNIV OF TECH
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