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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 the problems of easy segregation, expensive equipment, particle reinforcement shape, distribution law and size cannot complement each other, to reduce segregation, less equipment investment, volume The effect that the score can control

Inactive Publication Date: 2007-03-28
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 1g of La by weight as 1% 2 O 3 Dissolve in 30ml of 65% concentrated nitric acid, and then add 3g of 3% Al by weight after complete dissolution 2 O 3 , Al 2 O 3 The particle size is 40 ~ 100nm, fully stir and let stand for 1 hour;

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

[0037] The above nitrate solution was placed in a box-type resistance furnace and dried at 400°C for 3 hours, then heated to 900°C for 3 hours, so that lanthanum nitrate and copper nitrate were respectively cracked into lanthanum oxide and copper oxide;

[0038] The cracked mixed oxide powder was placed in an atmosphere protection furnace, exhausted for 50 minutes, and after the hydrogen could be safely ignited, the temperature was raised to 400 °C at ...

Embodiment 2

[0041] Take 0.2g of La with a weight percentage of 0.2% 2 O 3 Dissolve in 30ml of 65% concentrated nitric acid, and then add 0.6g of 0.6% Al by weight after complete dissolution 2 O 3 , Al 2 O 3 The particle size is 40 ~ 100nm, fully stir and let 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 composite material mass, fully stir and let stand for 1 hour, until the copper is completely converted into copper nitrate;

[0043] The above nitrate solution was placed in a box-type resistance furnace and dried at 300°C for 1 hour, then heated to 800°C for 3 hours, so that lanthanum nitrate and copper nitrate were respectively cracked into lanthanum oxide and copper oxide;

[0044] The cracked mixed oxide powder was placed in an atmosphere protection furnace, exhausted for 50 minutes, and after the hydrogen could be safely ignited, the temperat...

Embodiment 3

[0047] Take 0.5g of La with a weight percentage of 0.5% 2 O 3 Dissolve in 25ml of 65% concentrated nitric acid, and add 1.5g of 1.5% Al by weight after complete dissolution 2 O 3 , Al 2 O 3 The particle size is 40 ~ 100nm, fully stir and let stand for 1 hour;

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

[0049] The above nitrate solution was placed in a box-type resistance furnace and dried at 400°C for 1 hour, then heated to 850°C and kept for 5 hours, so that lanthanum nitrate and copper nitrate were cracked into lanthanum oxide and copper oxide respectively;

[0050] The cracked mixed oxide powder was placed in an atmosphere protection furnace, exhausted for 50 minutes, and after the hydrogen could be safely ignited, the tem...

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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 present invention also relates to the preparation method of the material. Background technique [0002] Alumina dispersion-strengthened copper matrix composites are favored due to their high strength and high conductivity at high temperatures. At present, the methods for preparing such composites include external particle method and in situ synthesis method. The process of the external particle method is relatively simple, and the Al in the composite material is relatively simple. 2 O 3 The volume fraction of particles is controllable, the disadvantage is that Al 2 O 3 The specific gravity of the particles and copper is quite different, and the wettability of the two is also poor, so it is difficult to avoid segregation; 2 O 3 The particles are added from the outside, and other impurities such ...

Claims

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Application Information

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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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