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Cu-La2O3/Al2O3 composite material and its preparing method

A composite material, al2o3 technology, applied in the field of metal matrix composite materials, can solve problems such as easy to produce segregation, expensive equipment, shape of particle reinforcement, and non-complementary size of distribution law, so as to reduce segregation, reduce equipment investment, and reduce volume Score can control the effect

Inactive Publication Date: 2008-08-27
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing in situ synthesis technology is difficult to precisely control Al 2 o 3 particle volume fraction, and the process is complicated and the equipment is expensive; and a single Al 2 o 3 Particle reinforcements are not complementary due to their own shape, distribution and size, and are prone to segregation, and composite particle reinforcements can just improve this situation

Method used

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  • Cu-La2O3/Al2O3 composite material and its preparing method
  • Cu-La2O3/Al2O3 composite material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 1g by weight of 1% La 2 o 3 Dissolve in 30ml of 65% concentrated nitric acid, and then add 3g of 3% Al by weight after completely dissolving 2 o 3 , Al 2 o 3 The particle size is 40-100nm, fully stirred and allowed to stand for 1 hour;

[0036] Add distilled water according to the ratio of diluting the concentration of nitric acid to 20%, then add 96g of copper powder accounting for 96% of the mass of the composite material, stir fully and let it stand for 2 hours until the copper is completely converted into copper nitrate;

[0037] Put the above nitrate solution in a box-type resistance furnace and dry at 400°C for 3 hours, then raise the temperature to 900°C for 3 hours, so that lanthanum nitrate and copper nitrate are cracked into lanthanum oxide and copper oxide respectively;

[0038] Put the cracked mixed oxide powder in the atmosphere protection furnace, exhaust it for 50 minutes first, and after the hydrogen can be ignited safely, raise the temperature...

Embodiment 2

[0041] Take 0.2g by weight of 0.2% La 2 o 3 Dissolve in 30ml of 65% concentrated nitric acid, and then add 0.6g of 0.6% Al by weight after it is completely dissolved 2 o 3 , Al 2 o 3 The particle size is 40-100nm, fully stirred and allowed to stand for 0.5 hours;

[0042] Add distilled water according to the ratio of diluting the concentration of nitric acid to 30%, then add 99.2g of copper powder accounting for 99.2% of the mass of the composite material, stir well and let it stand for 1 hour until the copper is completely converted into copper nitrate;

[0043] Put the above nitrate solution in a box-type resistance furnace and dry at 300°C for 1 hour, then heat it up to 800°C for 3 hours, so that lanthanum nitrate and copper nitrate are cracked into lanthanum oxide and copper oxide respectively;

[0044] Put the cracked mixed oxide powder in the atmosphere protection furnace, exhaust it for 50 minutes, and after the hydrogen can be ignited safely, raise the temperature...

Embodiment 3

[0047] Take 0.5g by weight of 0.5% La 2 o 3 Dissolve in 25ml of 65% concentrated nitric acid, and then add 1.5g of 1.5% Al by weight after it is completely dissolved 2 o 3 , Al 2 o 3 The particle size is 40-100nm, fully stirred and allowed to stand for 1 hour;

[0048] Add distilled water according to the ratio of diluting the concentration of nitric acid to 25%, then add 98g of copper powder accounting for 98% of the mass of the composite material, stir fully and let stand for 1.5 hours until the copper is completely converted into copper nitrate;

[0049] Put the above nitrate solution in a box-type resistance furnace and dry it at 400°C for 1 hour, then raise the temperature to 850°C and keep it for 5 hours, so that lanthanum nitrate and copper nitrate are cracked into lanthanum oxide and copper oxide respectively;

[0050] Put the pyrolyzed mixed oxide powder in an atmosphere protection furnace, exhaust it for 50 minutes, and after the hydrogen can be ignited safely, ...

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Abstract

The invention discloses Cu-La202 / Al203 composite material that is made up from 0.2-1wt% La 203, 0.6-3wt% Al203, and the rest is Cu. The producing process includes the following steps: dissolving La203 into 65% aqua fortis to make lanthanum nitrate solution, adding Al203. After adding distilled water to dilute, adding copper powder to make copper nitrate, drying the mixture solution, cracking to gain lanthana, copper oxide, and alumina powder, taking deoxidization to the mixture powder by hydrogen to gain Cu-La 203 / Al203 composite powder, pressure molding the powder, sintering and hot extruding, the material would be gained. The invention has the advantages of simple technology, low cost and more excellent capability than Cu / Al203.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite materials, in particular to a Cu-La 2 o 3 / Al 2 o 3 The composite material, the invention also relates to the preparation method of the material. Background technique [0002] Alumina dispersion strengthened copper matrix composites are favored due to their combination of high strength and high conductivity at high temperature. At present, the methods for preparing such composite materials include the method of adding particles and in-situ synthesis. The process of adding particle method is relatively simple, and Al in the composite material 2 o 3 The volume fraction of particles is controllable, the disadvantage is that Al 2 o 3 The specific gravity of particles and copper is quite different, and the wettability of the two is also poor, so it is difficult to avoid segregation; in addition, because Al 2 o 3 Particles are added from the outside, and other impurities such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C1/05B22F9/16B22F3/12
Inventor 梁淑华肖鹏范志康
Owner XIAN UNIV OF TECH
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