阅读说明：本技术 一种钼酸镉改性铜基复合电接触材料的制备方法 (Preparation method of cadmium molybdate modified copper-based composite electrical contact material ) 是由 谷文伟 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种钼酸镉改性铜基复合电接触材料的制备方法,该方法利用原位合成的方法使CdMoO<Sub>4</Sub>均匀的在铜粉颗粒表面形核长大,从而制备第二相均匀弥散分布的钼酸镉改性铜基(CdMoO<Sub>4</Sub>/Cu)复合电接触材料。本专利通过原位合成的方法不仅解决了CdO/Ag触头材料中Cd蒸气的污染问题和Ag资源短缺的问题,更加实现了CdMoO<Sub>4</Sub>的均匀弥散分布的目的；通过热挤压—轧制—冲压等环节,利用铜合金塑性好的特点,实现了CdMoO<Sub>4</Sub>/Cu复合材料高效的致密化,并且进一步提高了CdMoO<Sub>4</Sub>在铜基体中的均匀弥散程度,从而提高了电触头的微观组织性能以及服役性能。(The invention discloses a preparation method of a cadmium molybdate modified copper-based composite electrical contact material, which utilizes an in-situ synthesis method to lead CdMoO 4 Uniformly nucleates and grows on the surface of copper powder particles, thereby preparing the cadmium molybdate modified copper base (CdMoO) with the second phase uniformly and dispersedly distributed 4 /Cu) composite electrical contact material. The method solves the problems of Cd steam pollution and Ag resource shortage in the CdO/Ag contact material through the in-situ synthesis method, and realizes CdMoO 4 The purpose of uniform dispersion distribution; by hot extrusion-rolling-stamping and other links, copper is utilizedThe characteristic of good alloy plasticity realizes CdMoO 4 the/Cu composite material has high-efficiency densification and further improves CdMoO 4 The degree of uniform dispersion in the copper matrix improves the microstructure performance and service performance of the electrical contact.)

1. A preparation method of a cadmium molybdate modified copper-based composite electric contact material is characterized by comprising the following steps: the method comprises the following steps:

(1) taking the dosage of Na₂MoO₄Dissolving in water to obtain mixed solution, adding copper alloy powder with the dosage of 40-60% of the formula, stirring to form suspension, and adding CdCl₂Adding the water solution into the suspension, continuously stirring, filtering, washing and drying to obtain composite powder;

(2) and mixing the obtained composite powder with the residual copper alloy powder in the formula, performing compression molding and sintering, performing hot extrusion on the sintered composite material to obtain a plate, and then performing rolling, annealing treatment and stamping to obtain a contact element, namely the cadmium molybdate modified copper-based composite electrical contact material.

2. The method for preparing a cadmium molybdate-modified copper-based composite electrical contact material according to claim 1, wherein the cadmium molybdate-modified copper-based composite electrical contact material comprises the following steps: the copper alloy powder consists of copper, lanthanum and zirconium.

3. The method for preparing a cadmium molybdate-modified copper-based composite electrical contact material according to claim 1, wherein the cadmium molybdate-modified copper-based composite electrical contact material comprises the following steps: the compression molding is performed under 350-450 MPa.

4. The method for preparing a cadmium molybdate-modified copper-based composite electrical contact material according to claim 1, wherein the cadmium molybdate-modified copper-based composite electrical contact material comprises the following steps: the sintering temperature is 950-.

5. The method for preparing a cadmium molybdate-modified copper-based composite electrical contact material according to claim 1, wherein the cadmium molybdate-modified copper-based composite electrical contact material comprises the following steps: the blanking amount of the rolling is 0.2mm, the annealing treatment is 440-460 ℃, and the temperature is kept for 0.2-1 h.

Technical Field

The invention relates to the technical field of electric contact materials, in particular to a preparation method of a cadmium molybdate modified copper-based composite electric contact material.

Background

Electrical contact elements for low-voltage circuit breakers usually employ copper-based electrical contact materials prepared by powder metallurgical sintering. The electric contact element is used in complex load environments such as mechanical impact wear and partial arc ablation, and therefore high requirements are put on the mechanical wear resistance and the arc ablation resistance of the electric contact element.

The CdO/Ag contact material has the advantages of good arc ablation resistance, good fusion welding resistance, low contact resistance, stability and the like, has very wide application, and is once called as a universal contact. However, the CdO/Ag contact material can generate toxic Cd steam due to the pyrolysis of CdO in the arc extinguishing process, and the pollution problem of Cd also exists in the production and recovery processes, and the forced elimination problem is gradually faced with the enhancement of environmental awareness of people. And as one of noble metals, the silver resource in the world is limited, Ag is gradually consumed due to damage in the using process, and the Ag cannot be recycled to cause a large amount of waste of Ag, so that people have to develop a novel high-performance contact material. Copper is used as a material similar to silver in electrical property, has low cost and abundant resources, and is expected to replace silver to become a substrate of a new generation of contact material. However, the mechanical and physical properties and electrical contact properties of the electrical contact material prepared by the conventional powder metallurgy sintering process cannot meet the requirements of practical application.

Disclosure of Invention

In order to solve the technical problem, the invention uses an in-situ synthesis method to make CdMoO₄Uniformly nucleates and grows on the surface of copper powder particles, thereby preparing the acid cadmium modified copper base (CdMoO) with the second phase uniformly dispersed and distributed₄/Cu) composite electrical contact material. The method solves the problems of Cd steam pollution and Ag resource shortage in the CdO/Ag contact material through the in-situ synthesis method, and realizes CdMoO₄The purpose of uniform dispersion distribution; the CdMoO is realized by the links of hot extrusion, rolling, stamping and the like and by utilizing the characteristic of good plasticity of the copper alloy₄the/Cu composite material has high-efficiency densification and further improves CdMoO₄The degree of uniform dispersion in the copper matrix improves the microstructure performance and service performance of the electrical contact.

The invention provides a preparation method of a cadmium molybdate modified copper-based composite electric contact material, which comprises the following steps:

(1) taking the dosage of Na₂MoO₄Dissolving in water to obtain mixed solution, adding copper alloy powder with dosage of 40-60% to form suspension, and stirringCdCl₂Adding the aqueous solution into the suspension, continuously stirring, filtering, washing and drying to obtain composite powder;

(2) and mixing the obtained composite powder with the residual copper alloy powder in the formula, performing compression molding and sintering, performing hot extrusion on the sintered composite material to obtain a plate, and then performing rolling, annealing treatment and stamping to obtain a contact element, namely the cadmium molybdate modified copper-based composite electrical contact material.

Further, the copper alloy powder consists of copper, lanthanum and zirconium.

Further, the compression molding is performed at 350-450 MPa.

Further, the sintering temperature is 950-.

Furthermore, the blanking amount of the rolling is 0.2mm, the annealing treatment is 440-460 ℃, and the temperature is kept for 0.2-1 h.

The invention has the beneficial effects that:

(1) the invention provides a preparation method combining an in-situ synthesis method with strong deformation and heat treatment to realize CdMoO₄The copper alloy is synthesized in situ with the copper alloy matrix and is uniformly dispersed and distributed, and the microstructure, the mechanical and physical properties and the electrical contact property of the composite material are regulated and controlled.

(2) The process is characterized in that the in-situ synthesis method leads the second phase CdMoO₄The nucleation and growth on the copper matrix are uniform, the interface bonding strength of the composite material is high, and the CdMoO is realized₄The purpose of uniform dispersion distribution; the CdMoO is realized by the links of hot extrusion, rolling, stamping and the like and by utilizing the characteristic of good plasticity of the copper alloy₄High-efficiency densification of copper-based composite material and further improvement of CdMoO₄The degree of uniform dispersion in the copper matrix improves the microstructure performance and service performance of the electrical contact.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The experimental methods in the following examples, which are not specified under specific conditions, were generally conducted under conventional conditions. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.