Zero-sintering and hydrogen-expansion nano-diffusion reinforced Cu-Al2O3 alloy and its production

A dispersion-strengthening, cu-al2o3 technology, applied in the field of Cu-Al2O3 alloy and its preparation, can solve the problems of inability to use electric vacuum devices, expansion, etc., and achieve the effects of high electrical conductivity and high temperature resistance annealing softening performance

Inactive Publication Date: 2008-11-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, it is difficult for the above method to remove the remaining Cu-Al 2 o 3 Oxygen or other gases in the alloy are completely reduced or exhausted, which often causes the alloy to burn hydrogen at high temperature and expand, so it cannot be used in electric vacuum devices

Method used

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  • Zero-sintering and hydrogen-expansion nano-diffusion reinforced Cu-Al2O3 alloy and its production
  • Zero-sintering and hydrogen-expansion nano-diffusion reinforced Cu-Al2O3 alloy and its production
  • Zero-sintering and hydrogen-expansion nano-diffusion reinforced Cu-Al2O3 alloy and its production

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: Alloy composition is Al 2 o 3 -0.22wt%, B-300ppm, the rest is Cu. According to the method (1)~(6) described in the "invention details", the hot-pressed ingot of Φ100 is made, and then heated to 930 °C under the protection of hydrogen to be hot-extruded into a rod of Φ20 (extrusion ratio 25 : 1), and cold-drawn to Φ14 bar (deformation 50%), the cold-drawn bar is annealed by hydrogen protection at 900°C for 1h, and the measured alloy performance data are shown in Table 1. It can be seen that the measurement accuracy is Under the condition of μm, the alloy does not observe hydrogen burning expansion phenomenon. The metallographic structure, TEM structure and appearance of the sample after burning hydrogen in this embodiment are shown in image 3 (b), (c) and figure 2 (c). It can be seen that the alloy in this example is in a fully dense and fully metallurgical state, and 5-20nm Al is dispersed inside the alloy. 2 o 3 Particles, particle anchors to dis...

Embodiment 2

[0029] Embodiment 2: Alloy composition is Al 2 o 3 -0.22wt%, the rest is Cu. Compared with Example 1, only the secondary reducing agent B is not added, and the rest of the preparation and processing methods are the same as in Example 1, and the experimental conditions are also the same. The measured performance data of the alloy are shown in Table 2. It can be seen that even without the addition of the secondary reducing agent B, the C in the graphite mold still has a secondary reduction effect during vacuum autoclaving, and the vacuum can remove the gas in the alloy powder. The alloy also undergoes little hydrogen expansion (measured maximum size increase of only 3 μm).

[0030] Table 2 Cu-0.22wt% Al in this example 2 o 3 Alloy property data

[0031]

Embodiment 3

[0032] Embodiment 3: Alloy composition is Al 2 o 3 -0.22wt%, the rest is Cu and unavoidable impurities. Same as Example 2, no secondary reducing agent B was added. In addition to heat pressure is slightly greater than 10 5 Except carrying out in the high-purity Ar gas protection of Pa, all the other preparation methods are the same as in Example 2, and the experimental conditions are also the same. The measured alloy performance data are shown in Table 3. It can be seen that hot pressing in high-purity Ar gas will make Cu-Al 2 o 3 The alloy contains gas, resulting in slight hydrogen expansion (about 8-15 μm).

[0033] Table 3 Cu-0.22wt% Al in this example 2 o 3 Alloy property data

[0034]

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Abstract

Zero burning hydrogen swelling nanometer diffusion strengthens Cu-Al2O3 alloy and its preparation method. It includes the smelting of the Cu-Al alloy, atomizing Cu-Al alloy powder by using the high-purity N2, sieving , the preparation of the oxidant, the inner oxidize, the hydrogen restores once, solid reducer B restores again, vacuum heat pressing cementation , hot extrusion and cold forming process. The alloy provides in this invention the alloy compares with no oxygen copper, itssigma0.2 is 3-11times higher than no oxygen copper, the temperature of resisting anneal softening can be above 900DEG C, and the electric conduction rate may amount to 75%IACS-96%IACS, it has the characteristic of zero fever hydrogen swelling, it can be applied to the high-pressure cock electric conduction pole , automobile electric resistance welding electrode, the large-scale integrated circuit fuse frame, conticaster crystallizer , the fabrication of the heat sink component which is controlled by the thermonuclear reaction, it is also suitable to the fabrication of the electricity vacuum air seal documents and high precise documents such as microwave tube , X-ray tube , atomsmasher etc.

Description

technical field [0001] The present invention relates to a Cu-Al 2 o 3 Alloys and methods of making them. Background technique [0002] Pure copper (such as C10100, TU1, etc.) has high conductivity (98-102% IACS), but its strength is too low (σ 0.2 only 50MPa). Although the Cu-Fe-P series, Cu-Ni-Si series, and Cu-Cr-Zr series precipitation-strengthened copper alloys have high strength and high electrical conductivity, their resistance to high-temperature annealing and softening is not high, and they appear rapidly when the temperature is higher than 500°C. Annealing softens. Nano-dispersion strengthened copper alloy is a kind of copper alloy with high strength, high conductivity and resistance to high temperature annealing softening. Cu-Al 2 o 3 Alloys are one of its important categories. Because of these excellent properties, Cu-Al 2 o 3 Alloys have been widely used in electric vacuum microwave tubes, large-scale integrated circuit lead frames, high-voltage switch c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C1/00B22F3/00B22F9/00
Inventor 汪明朴李周娄花芬程建奕郭明星
Owner CENT SOUTH UNIV
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