阅读说明：本技术 一种高表面精度铜合金带材及其制备方法 (High-surface-precision copper alloy strip and preparation method thereof ) 是由 郁杨 于 2019-10-14 设计创作，主要内容包括：本发明提供了一种高表面精度铜合金带材,属于铜合金带材加工技术领域,所述制备方法包括以下步骤：将铜铪合金板材进行打磨处理,随后在混合气氛带式炉中进行微氧化反应,得到表面微氧化铜铪合金板材；将上述所得表面微氧化铜铪合金板材输送进入氢气还原炉中进行加热反应,使板材表面形成高硬度的纳米氧化铪弥散强化铜薄层；将所得纳米氧化铪弥散强化铜板材进行热轧、冷轧加工,制备得到高表面精度铜合金带材。本发明中合金制备方法操作简单、产品成品率高,所得铜合金带材具有较强的抗氧化性能。(the invention provides a high-surface-precision copper alloy strip, belonging to the technical field of copper alloy strip processing, and the preparation method comprises the following steps: polishing the copper-hafnium alloy plate, and then carrying out micro-oxidation reaction in a mixed atmosphere belt furnace to obtain a surface micro-oxidized copper-hafnium alloy plate; conveying the obtained surface micro-copper hafnium oxide alloy plate into a hydrogen reduction furnace for heating reaction to form a high-hardness nano-hafnium oxide dispersion strengthened copper thin layer on the surface of the plate; and carrying out hot rolling and cold rolling on the obtained nano hafnium oxide dispersion strengthened copper plate to prepare the copper alloy strip with high surface precision. The alloy preparation method provided by the invention is simple to operate, the product yield is high, and the obtained copper alloy strip has strong oxidation resistance.)

1. The preparation method of the copper alloy strip with high surface precision is characterized by comprising the following steps:

(1) Micro-oxidation of the surface of the plate: heating the copper-hafnium alloy plate in a mixed atmosphere belt furnace to obtain a surface micro-oxidized copper-hafnium alloy plate;

(2) Reducing the surface of the plate: conveying the surface micro-copper hafnium oxide alloy plate obtained in the step (1) into a hydrogen reduction furnace for heating reaction, so that a high-hardness nano-hafnium oxide dispersion strengthened copper thin layer is formed on the surface of the plate;

(3) Rolling and processing: and (3) carrying out hot rolling and cold rolling on the nano hafnium oxide dispersion strengthened copper plate obtained in the step (2) to prepare the copper alloy strip with high surface precision.

2. The copper alloy strip of claim 1, wherein the step of pre-treating the copper hafnium alloy sheet in step (1) comprises: polishing the copper-hafnium alloy plate by using abrasive paper, and cleaning the copper-hafnium alloy plate by using water for more than three times after polishing; wherein the granularity of the sand paper is 300# -500 #.

3. The copper alloy strip according to claim 1, wherein the mixed atmosphere in step (1) is at least one of a mixed gas of nitrogen and oxygen, and a mixed gas of argon and oxygen, and the volume fraction of oxygen in the mixed gas is 0.5-5%.

4. The copper alloy strip according to claim 1, wherein an oxygen concentration sensor is installed in the belt furnace in step (1).

5. The copper alloy strip according to claim 1, wherein the heating temperature in step (1) is 300-600 ℃ and the heating time is 0.5-2 h.

6. the copper alloy strip of claim 1, wherein the mass fraction of hafnium in the copper hafnium alloy sheet of step (1) is 0.1% to 0.5%.

7. The copper alloy strip according to claim 1, wherein the heating temperature in step (2) is 400-700 ℃ and the heating time is 0.5-2 h.

8. The copper alloy strip according to claim 1, wherein the specific steps of hot rolling and cold rolling in step (3) comprise: and (3) comprehensively heating the nano hafnium oxide dispersion strengthened copper plate obtained in the step (2) and carrying out hot rolling, after the hot rolling is finished, putting the obtained plate into an annealing furnace at 400-500 ℃ for annealing treatment for 10-30min, then rapidly and uniformly cooling to room temperature, and carrying out cold rolling deformation treatment at room temperature to obtain the copper alloy strip with high surface precision.

9. The copper alloy strip according to claim 8, wherein the hot rolling conditions are: hot rolling temperature is 300-450 deg.C, hot rolling pressure is 0.5-0.7Mpa, and hot rolling speed is 8-12 m/min; the cold rolling pressure is 1 x 10^-3-1×10^{- 1}Mpa。

Technical Field

The invention belongs to the technical field of copper alloy strip processing, and particularly provides a method for preparing a high-surface-precision copper alloy strip by using a copper-hafnium alloy as a raw material.

background

The copper alloy strip is an important variety in copper processing materials, and is widely applied to various fields of electronics, electricity, communication, instruments and meters, instrument control machinery, medicine, optics, aviation satellites, transportation and the like. Particularly, with the development of modern communication, electronic and semiconductor industries, the demand of the copper strip is increased sharply, and particularly, the market space of the high-precision and high-performance copper strip products is wide.

However, in the process of rolling and processing the copper alloy strip, instability of higher or lower heating temperature occurs, the surface of the copper alloy has serious oxidation problem, and the surface hardness is low, so that the surface quality of the copper alloy strip is reduced in the rolling and processing process, the defective rate is increased, and the economic benefit of an enterprise is seriously affected.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the copper alloy strip with high surface precision and the preparation method thereof.

the technical scheme of the invention is as follows:

A high-surface-precision copper alloy strip is prepared by the following steps:

(1) Micro-oxidation of the surface of the plate: heating the copper-hafnium alloy plate in a mixed atmosphere belt furnace to obtain a surface micro-oxidized copper-hafnium alloy plate;

(2) Reducing the surface of the plate: conveying the surface micro-copper hafnium oxide alloy plate obtained in the step (1) into a hydrogen reduction furnace for heating reaction, so that a high-hardness nano-hafnium oxide dispersion strengthened copper thin layer is formed on the surface of the plate;

(3) Rolling and processing: and (3) carrying out hot rolling and cold rolling on the nano hafnium oxide dispersion strengthened copper plate obtained in the step (2) to prepare the copper alloy strip with high surface precision.

the pretreatment step of the copper hafnium alloy plate in the step (1) comprises the following steps: polishing the copper-hafnium alloy plate by using abrasive paper, and cleaning the copper-hafnium alloy plate by using water for more than three times after polishing; wherein the granularity of the sand paper is 300# -500 #.

The mixed atmosphere in the step (1) is at least one mixed gas of a mixed gas of nitrogen and oxygen and a mixed gas of argon and oxygen, and the volume fraction of oxygen in the mixed gas is 0.5-5%.

And (2) installing an oxygen concentration sensor in the belt furnace in the step (1).

The heating temperature in the step (1) is 300-600 ℃, and the heating time is 0.5-2 h.

The mass fraction of hafnium in the copper-hafnium alloy plate in the step (1) is 0.1-0.5%.

In the step (2), the heating temperature is 400-700 ℃, and the heating time is 0.5-2 h.

The hot rolling and the cold rolling in the step (3) comprise the following specific steps: and (3) comprehensively heating the nano hafnium oxide dispersion strengthened copper plate obtained in the step (2) and carrying out hot rolling, after the hot rolling is finished, putting the obtained plate into an annealing furnace at 400-500 ℃ for annealing treatment for 10-30min, then rapidly and uniformly cooling to room temperature, and carrying out cold rolling deformation treatment at room temperature to obtain the copper alloy strip with high surface precision.

The hot rolling conditions are as follows: hot rolling temperature is 300-450 deg.C, hot rolling pressure is 0.5-0.7Mpa, and hot rolling speed is 8-12 m/min; the cold rolling pressure is 1 x 10^-3-1×10^-1Mpa。

the beneficial technical effects of the invention are as follows:

The invention puts the copper hafnium alloy plate on N₂+O₂Or argon + O₂Heating in a mixed atmosphere belt furnace to form a composite oxide surface layer of copper oxide and hafnium oxide on the surface of the plate, heating in a hydrogen reduction furnace to form a nano hafnium oxide dispersion strengthened copper thin layer on the surface, wherein the reaction equation is 2CuO + Hf-2 Cu + HfO₂And then hot rolling and cold rolling to obtain the copper alloy strip. The thin-layer hafnium oxide dispersion strengthening copper is generated on the surface of the copper-hafnium alloy, the surface hardness is improved, the oxidation resistance of a copper alloy strip is enhanced, the mechanical and physical properties of a base material cannot be influenced, the nano hafnium oxide is different from a precipitation phase, the copper base body has no solid solubility, the copper alloy strip has excellent high-temperature stability and high hardness, the size of formed particles is in a nanometer level, the dispersion strengthening effect is realized through an olorowan mechanism, the dislocation motion and the crystal boundary movement can be effectively hindered at high temperature, the growth of crystal grains is inhibited, and the mechanical properties of the copper material are greatly improved. Meanwhile, the nano hafnium oxide can slow down the diffusion of oxygen in the copper matrix at high temperature, thereby improving the oxidation resistance. And is beneficial to improving the surface finish and the surface precision of the copper alloy strip in the rolling process, and the surfaceThe surface roughness reaches 0.1 micron, thereby improving the yield.

According to the invention, the copper hafnium alloy is subjected to polishing pretreatment, the surface of the plate is roughened, the specific surface area is increased as much as possible, the reaction can be accelerated, and the micro-oxidation reaction can be uniformly and stably carried out.

The invention can well control the oxygen content in the system on line by modifying the belt furnace in the micro-oxidation reaction process and installing the oxygen sensor, thereby ensuring the stability of the oxygen content in the reaction process and leading the oxidation reaction to be carried out stably.

According to the invention, finally, hot rolling and cold rolling are sequentially carried out, the advantages of a cold rolling technology are combined, the strength and hardness of the reinforced material are further expanded, and the mechanical property of the material are reinforced by cooperating with the generated thin-layer hafnium oxide dispersion strengthened copper.

Detailed Description

The present invention will be described in detail with reference to examples.