A rare earth oxide-doped molybdenum-copper alloy composite material and preparation method thereof

A rare earth oxide and composite material technology is applied in the field of rare earth oxide doped molybdenum-copper alloy composite material and its preparation, which can solve the problems of reduced electrical and thermal conductivity, limitation, poor wettability of molybdenum and copper, and achieves toughness, thermal conductivity and electrical conductivity. The effect of improving performance, improving compactness and improving sintering performance

Inactive Publication Date: 2017-07-07
HENAN UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

The electrical and thermal conductivity of the material will be significantly reduced by adding a small amount of nickel to the activation sintering method; the use of ultra-fine powder sintering can refine the particle size of the molybdenum-copper alloy powder and increase the density of the molybdenum-copper alloy. When the ultra-fine powder is sintered, the molybdenum-copper alloy is dense The dominant mechanism of granulation is particle rearrangement. Because the capillary force of fine particles is relatively large, it is conducive to the rearrangement process, but the uniformity of composition and powder particle size will have a huge impact on particle rearrangement; the infiltration method is used When preparing molybdenum-copper alloy, because the wettability of molybdenum-copper is worse than that of tungsten-copper, especially when preparing molybdenum-copper alloy with low copper content, the density of the material after infiltration is low, resulting in air tightness, electrical conductivity, and thermal conductivity. The requirements are not met, the application is limited, and this method is cumbersome and difficult to operate

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  • A rare earth oxide-doped molybdenum-copper alloy composite material and preparation method thereof
  • A rare earth oxide-doped molybdenum-copper alloy composite material and preparation method thereof
  • A rare earth oxide-doped molybdenum-copper alloy composite material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0035] A preparation method of a rare earth oxide-doped molybdenum-copper alloy composite material of the present invention specifically comprises the following steps:

[0036] 1) using molybdic acid or soluble molybdate, copper nitrate and rare earth nitrate as raw materials, respectively preparing an aqueous solution, then adding an appropriate amount of ammonia water to the copper nitrate solution, and adding an appropriate amount of weak acid to the rare earth nitrate solution;

[0037] The add-on of described ammoniacal liquor is: NH 3 The molar ratio to copper nitrate is 2 to 3:1, and the concentration of ammonia water used is 15mol L -1 The amount of the organic weak acid added is: the molar ratio of the organic weak acid to the rare earth nitrate is 2 to 3:1; the organic weak acid is added in the form of an acid solution, and the concentration of the organic weak acid in the acid solution is 0.2mol L -1 ;

[0038] The soluble molybdate is one or more of ammonium dimoly...

experiment example 1

[0047] The rare earth oxide-doped molybdenum-copper alloy composite material obtained in Example 1 was analyzed. The result is as figure 1 , 2 shown.

[0048] figure 1 It is the microstructure diagram of the rare earth oxide-doped molybdenum-copper alloy composite material powder obtained in Example 1; figure 2 It is the EDS energy spectrum of the lanthanum oxide-doped molybdenum-copper alloy composite powder obtained in Comparative Example 1. From figure 1 , 2 It can be seen that the composite material powder obtained in Example 1 is soft agglomerated, the particle size distribution is uniform, and the average particle size is about 1 μm.

[0049] Adopt the same method to analyze the rare earth oxide-doped molybdenum-copper alloy composite material obtained in Examples 2-6, and the result is the same as in Example 1: the composite material powder is softly agglomerated, the particle size distribution is uniform, and the average particle size is 0.5-1.5 μm.

experiment example 2

[0051] The rare earth oxide-doped molybdenum-copper alloy composite material obtained in Example 1 was vacuum hot-pressed and sintered to obtain Mo-30%Cu-1.5%La 2 o 3 For the alloy, the density of the alloy is measured by the Archimedes principle, and the relative density of the billet is calculated; the electrical conductivity is tested by the FD101 digital portable eddy current conductivity meter; the Brinell hardness is measured by the THB-3000E electronic Brinell hardness tester. The properties of the composite materials are shown in Table 3 below. Simultaneously using comparative example 1 without La 2 o 3 The molybdenum-copper alloy composite powder was sintered by vacuum hot pressing to obtain Mo-30%Cu alloy as a comparison.

[0052] It can be seen from Table 3 that after adding rare earth oxides, under the same sintering process conditions, the density, compactness and electrical conductivity of the alloy are all improved.

[0053] Table 3 Properties of Mo-30Cu com...

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Abstract

The invention discloses a rare earth oxide-doped molybdenum-copper alloy composite material and a preparation method thereof. The composite material is composed of the following components by mass percentage: 10% to 39.9% of copper, 0.1% to 3.0% of rare earth oxide, and the balance is molybdenum and inevitable impurities. The rare earth oxide-doped molybdenum-copper alloy composite material of the present invention is composed of molybdenum, copper and rare-earth oxide. The rare-earth oxide is added into the molybdenum-copper alloy as a second phase doping, which significantly improves the sintering performance of the molybdenum-copper alloy. It is coated with copper to form a complete crystal around the rare earth oxide, and the molybdenum element and the copper element have good wettability under the action of the rare earth oxide, which realizes the molecular level mixing of molybdenum and copper, which greatly improves the The compactness of the molybdenum-copper alloy, and the final strength, toughness and thermal conductivity of the molybdenum-copper alloy are significantly improved.

Description

technical field [0001] The invention relates to the technical field of molybdenum-copper alloy composite materials, in particular to a rare earth oxide-doped molybdenum-copper alloy composite material and a preparation method thereof. Background technique [0002] Molybdenum-copper alloy has broad application prospects because of its high electrical conductivity, high thermal conductivity, high strength, adjustable low expansion coefficient, non-magnetic properties and excellent high temperature resistance. The main application scopes are: ①vacuum contacts, which are currently being promoted and applied in a large area in China; ②conductive heat dissipation components, which can meet the high electrical conductivity, thermal conductivity, heat resistance, vacuum performance and constant temperature of high-power integrated circuits and microwave devices. Requirements such as thermal expansion coefficient; ③ As some special requirements of instrumentation components, to meet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/10B22F9/22
Inventor 李继文赵清万成王展马窦琴张国赏徐流杰魏世忠
Owner HENAN UNIV OF SCI & TECH
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