Method for preparing Cu/Cr2O3 composite material from Ce-CuCr prealloy powder

A pre-alloyed powder and composite material technology, which is applied in the field of metal matrix composite material preparation, can solve the problems of slow oxidation rate, oxide grain boundary segregation, and wide application of limited internal oxidation methods, so as to achieve grain refinement and high temperature improvement. performance effect

Inactive Publication Date: 2010-09-29
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is Al or Cr in the internal oxidation of copper, the oxidation rate is slow and the formed oxides are segregated at the grain boundary in the later stage of internal oxidation, which limits the wide application of internal oxidation methods.

Method used

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  • Method for preparing Cu/Cr2O3 composite material from Ce-CuCr prealloy powder
  • Method for preparing Cu/Cr2O3 composite material from Ce-CuCr prealloy powder
  • Method for preparing Cu/Cr2O3 composite material from Ce-CuCr prealloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Drill a copper rod, put thin strips of Ce into the hole, seal it with copper powder and put it in a crucible, use a ZRS-18Q microcomputer program-controlled vacuum sintering furnace for melting, and smelt it into Cu-Ce with Ce accounting for 10% of the total weight master alloy. The melting process is: the degree of vacuum is 10 -2 Pa, raise the temperature to 900-920°C in 40 minutes, keep it warm for 20 minutes, then continue to raise the temperature to 1180-1200°C, hold it for 30 minutes, and finally cool it with the furnace to get a Cu-Ce master alloy; atomize into powder, and sieve the powder to obtain Cu-Ce master alloy powder with a particle size of 100-200 microns.

[0027] Take respectively the copper powder 50g of average particle size 55 microns, the chromium powder 1.5g of average particle size 55 microns and the Cu-Ce master alloy powder 0.3010g that last step makes (make Ce content be 0.05wt% of copper, so required Ce The amount of Cu-Ce is 0.025g, then t...

Embodiment 2

[0031] Prepare Cu-Ce master alloy powder by the method described in embodiment 1, control vacuum tightness is 10 -3 Pa, the smelting process is: raise the temperature to 900°C in 40 minutes, keep it warm for 25 minutes, then continue to raise the temperature to 1180-1200°C, and hold it for 35 minutes.

[0032]Take respectively the copper powder 50g of average particle size 55 microns, the chromium powder 1.5g of average particle size 55 microns and the Cu-Ce master alloy powder 0.6020g that last step makes (make Ce content be 0.1wt% of copper, so required Ce The amount of Cu-Ce is 0.05g, then the amount of master alloy Cu-Ce to be added during ball milling is 0.05÷(10%×83.06%)=0.6020g, wherein the master alloy for smelting is Cu-10Ce, and the absorption rate of Ce is 83.06% ).

[0033] Put 0.6020g of Cu-Ce master alloy powder, 1.5g of chromium powder and a small amount of alcohol into a horizontal ball mill at 100-120r / min for ball milling, control the ball milling speed to 1...

Embodiment 3

[0036] Prepare Cu-Ce master alloy powder by the method described in embodiment 1, control vacuum tightness is 0.5 * 10 -2 Pa, the smelting process is: raise the temperature to 900-920°C in 40 minutes, hold it for 23 minutes, then continue to raise the temperature to 1180-1200°C, hold it for 33 minutes.

[0037] Take respectively the copper powder 50g of average particle size 55 microns, the chromium powder 1.5g of average particle size 55 microns and the Cu-Ce master alloy powder 0.7224g that last step makes (Ce content is 0.12wt% of copper, so required Ce The amount is 0.06g, then the amount of master alloy Cu-Ce to be added during ball milling is 0.06÷(10%×83.06%)=0.7224g, wherein the master alloy for smelting is Cu-10Ce, and the absorption rate of Ce is 83.06%) .

[0038] Put 0.7224g of Cu-Ce master alloy powder, 1.5g of chromium powder and a small amount of alcohol into a horizontal ball mill at 100-120r / min for ball milling, control the ball milling speed to 110r / min, an...

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Abstract

The invention discloses a method for adopting the powder of a Ce-CuCr pre-alloy to prepare the compound material of Cu / Cr2O3 which includes as follows: firstly preparing the powder of the middle alloy of Ce-Cu; then respectively adding the powder of Cr into the powder of the middle alloy of Ce-Cu to carry out ball milling to obtain the powder of the pre-alloy; then carrying out ball milling on the powder of the pre-alloy and the powder of cuprous oxide to obtain the compound powder; finally pressing the compound powder in a cooling way and shaping and sintering in a vacuum, thus preparing thecompound material of Cu / Cr2O3. The compound material prepared by the method of the invention has a high density; the generating rate of a reinforcing particle of Cr2O3 is high; besides, the compound material is uniformly arranged on a copper substrate.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite material preparation, and in particular relates to a method of preparing Cu / Cr by using Ce-CuCr pre-alloyed powder. 2 o 3 Composite approach. Background technique [0002] Copper-based composites reinforced with oxide particles have broad application prospects in electrode materials, electrical contact materials, and integrated circuit lead frame materials due to their high strength, high electrical conductivity, and good high-temperature performance. [0003] In order to achieve both high strength and high conductivity of oxide dispersion strengthened copper matrix composites at high temperature, the oxide dots must be uniformly distributed in the copper matrix with a fine size. In order to achieve this goal, the current research is mainly focused on optimizing the preparation process and improving the preparation method. Among the existing preparation methods, the internal oxida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F3/12
Inventor 梁淑华代卫丽范志康
Owner XIAN UNIV OF TECH
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