A kind of preparation method of zirconia dispersion strengthened copper alloy

A technology of dispersion strengthening and zirconia, which is applied in the field of metal matrix composite materials and preparation, can solve problems such as complex process, low diffusion efficiency, and low solid solubility of oxygen, and achieve simple process, high diffusion efficiency, and solid solubility big effect

Active Publication Date: 2020-10-13
DALIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in the present invention is: overcome existing ZrO 2 The preparation method of the enhanced ODS-Cu alloy has complex procedures, long cycle, many influencing factors and low efficiency. The strengthening phase in the alloy has a large particle size and is easy to segregate. The solid solubility of oxygen in the solid crystal is small and the diffusion efficiency is low. Problems such as oxide floating caused by alloy melt due to large difference in component specific gravity

Method used

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  • A kind of preparation method of zirconia dispersion strengthened copper alloy
  • A kind of preparation method of zirconia dispersion strengthened copper alloy
  • A kind of preparation method of zirconia dispersion strengthened copper alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 ODS-Cu alloy with nominal composition Cu -0.2 wt.% Zr

[0017] Step 1, the preparation composition is Cu 75 Zr 25 Alloy Ingots and Amorphous Ribbons

[0018] Using Cu (99.99%) and Zr (99.9%) metal raw materials, the atomic percentage composition is Cu 75 Zr 25 Converted into weight percentage components, weighed and prepared Cu-Zr alloy, mixed the raw materials and placed them in the water-cooled copper crucible of the non-consumable arc melting furnace, and then evacuated to 5×10 -3 - 1×10 -2 Pa, and then filled with 0.01 - 0.08 MPa of pure argon protective gas for melting, the working current of arc melting is 150-200 A; then turn the alloy ingot up and down, and repeat the melting for 3 times to obtain an alloy ingot with uniform composition;

[0019] The alloy ingot is crushed and put into a quartz tube, and the diameter of the nozzle of the quartz tube is about 1-1.5 mm. Put the charged quartz tube in the induction heating coil, use the vacuum cop...

Embodiment 2

[0026] Example 2 ODS-Cu alloy with nominal composition Cu -10.0 wt.% Zr

[0027] Step 1, prepare atomic percentage composition Cu 50 Zr 50 Alloy ingots with amorphous strips:

[0028] Same as Step 1 in Embodiment 1. Cu was determined by X-ray diffraction 50 Zr 50 The amorphous map is attached figure 1 As shown, its crystallization temperature Tx is 460°C.

[0029] Step two, Cu 50 Zr 50 Oxidation of amorphous strips:

[0030] Same as Step 2 in Embodiment 1. Cu here 50 Zr 50 The oxidation treatment temperature of the amorphous is 360°C, and the heat preservation time is 3 h, the obtained Cu 50 Zr 50 The X-ray diffraction pattern of oxide amorphous figure 1 shown.

[0031] Step 3, melting and preparing ODS-Cu alloy

[0032] Same as Step 3 in Embodiment 1. The microstructure is similar to that of the alloy in Example 1, the particles of the oxide strengthening phase are slightly larger (average diameter 10 nm), and the distribution density is nearly 15% higher tha...

Embodiment 3

[0033] Example 3 ODS-CuCrZr alloy with nominal composition Cu-0.75 wt.%Cr-0.2 wt.%Zr

[0034] Step 1, the preparation composition is Cu 75 Zr 25 Alloy Ingots and Amorphous Ribbons

[0035] Same as Step 1 in Embodiment 1.

[0036] Step two, Cu 75 Zr 25 Oxidation of amorphous strips

[0037] Same as Step 2 in Embodiment 1.

[0038] Step 3, melting and preparing ODS-CuCrZr alloy

[0039] Same as Step 3 in Embodiment 1. Adding 0.75 wt.% Cr, direct smelting to obtain ZrO with both precipitation strengthening and dispersion strengthening effects 2 Dispersion-strengthened CuCrZr alloy, its microstructure and morphology are similar to that of Example 1. The performance test results show that the as-rolled hardness of the cast ODS-CuCrZr alloy is 145 HV0.2 / 20, the room temperature tensile strength exceeds 420 MPa, and its room temperature plastic strain is 10%, but its room temperature conductivity is only 35% IACS; After proper solution aging treatment, the room temperature ...

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Abstract

The invention relates to a preparation method of zirconium dioxide dispersion strengthened copper alloy, and belongs to the field of metal-based composite materials and preparation technics. Through oxidation of Cu-Zr amorphous master alloy, Cu-ZrO2 combination with specific gravity close to that of matrix Cu can be obtained in advance, the Cu-ZrO2 combination is used as raw material and is mixedwith pure metal materials of copper and chromium, the mixture is directly prepared and smelted to obtain ODS-Cu with uniform and controllable structure or ODS-CuCrZr alloy. The method overcomes the floating problem of ZrO2 powder caused by the large difference between the specific gravity of the oxide and the matrix in past smelting process, gives full play to the advantages of amorphous alloy structure, uniform composition, large solid solubility of oxygen and high diffusion efficiency in the amorphous alloy to control oxygen addition amount of the alloy, and realizes effective regulation andcontrol of the size, number density, morphology and distribution density of ZrO2 reinforced particles; and ODS-Cu with uniform structure and the ODS-CuCrZr alloy are obtained through a casting process, so that the technological process is simple, efficient, controllable and easy to realize large-scale production. The room-temperature conductivity of ZrO2 dispersion strengthened high-strength high-conductivity copper alloy prepared by the method can be better than 85% IACS, and the room-temperature tensile strength and the plastic strain can reach 400 MPa and 35% respectively.

Description

technical field [0001] A kind of zirconium dioxide (ZrO) of the present invention 2 ) The preparation method of dispersion strengthened copper alloy belongs to the field of metal matrix composite material and preparation technology. Background technique [0002] High-strength and high-conductivity copper alloy materials have broad application prospects in aerospace, high-speed rail, integrated circuits, and nuclear fusion. It belongs to new copper alloy materials, mainly including precipitation strengthened copper (PH-Cu) alloy and dispersion strengthened copper (DS-Cu) alloy. The precipitation phase precipitated in the PH-Cu alloy represented by CuCrZr alloy often has a coherent relationship with the matrix, and the strengthening effect is excellent. However, the biggest problem faced by PH-Cu alloys is that the thermal stability of the precipitates is poor. When the working temperature is high, the coarsening and remelting of the precipitates will be caused, and the tens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/03C22C9/00C22C32/00
CPCC22C1/1036C22C1/1078C22C9/00C22C32/0021
Inventor 王英敏羌建兵宋丽娇刘歆翌
Owner DALIAN UNIV OF TECH
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