SMM9 March 18: today, at the 2020 (second) China Industrial Expo New Materials Forum-China Automotive New Materials Application Summit, and China (second) Copper processing Industry chain supply and demand Trading Summit, Xiao Xiangpeng, vice president of Jiangxi Advanced Copper Industry Research Institute of Jiangxi University of Technology, delivered a speech on the theme of "High performance Copper-based Materials for Automobiles and their Research and Development". In this paper, the copper-based materials for automobile charging piles and the copper-based materials for automobile wiring harness are described.

Copper-based materials for automobile charging piles

According to the Energy Saving and New Energy vehicle Industry Development Plan of the State Council (2012-2020), by 2020, the production capacity of pure electric vehicles and plug-in hybrid vehicles will reach 2 million vehicles, with a cumulative production and sales volume of more than 5 million vehicles.

The situation of copper-based materials for charging piles at home and abroad:

Abroad:

In the United States, the construction of charging piles has exceeded 50, 000 in 2014, and by 2019, the number has exceeded 100000, and is increasing year by year.

In France, 16000 new charging piles will be built in 2022, with a total investment of more than 80 million euros.

In Germany, by the end of 2019, the production of electric vehicles had reached 1 million, with less than 3000 charging piles.

In Japan, the number of charging piles in use has just exceeded 3000, which is far from enough to meet the demand for charging piles for electric vehicles.

Domestic:

Forecast of rechargeable pile market in China

Cu-Te alloy

C14500 has excellent cutting performance, arc resistance, corrosion resistance and electrical conductivity, which can meet the requirements of high current. The national Electroweb 900KW DC charging pile project has been established.

Cu-Cr-Zr alloy

High conductivity: up to 90% IACS; high strength: yield strength up to 560 MPa; high temperature resistance: high temperature softening resistance, good stress relaxation resistance.

Copper-based materials for automobile wiring harness

Wires and terminals account for 90% of the material cost of the harness and 90% of the weight of the harness, which is an important part of the harness.

Dozens of foreign-funded joint venture wire harness enterprises account for more than 80% of China's automobile wiring harness market.

C18150, C18080, C18070 copper alloy materials are used for frequency connector connectors in traditional internal combustion vehicles, hybrid vehicles and pure new energy-powered vehicles, such as window system, air conditioning system, engine management system, power system, audio system and so on.

Alloy Properties of High performance Connector Materials

Cu-Ni-Si alloy

Ultra-high strength: tensile strength up to 1000 MPa

Medium conductivity: 35-60% IACS

High temperature resistance: excellent resistance to high temperature softening and stress relaxation

Cu-Ti alloy

Cu-Ti is a high-strength, high-elastic and conductive copper alloy, whose physical properties are comparable to those of the representative beryllium-copper alloy strengthened by aging, and its high-temperature properties and stress relaxation resistance are better than those of beryllium-copper alloy. Although beryllium copper itself is non-toxic, it will emit invisible toxic gases in smelting, hot processing and heat treatment, which is harmful to health. Therefore, copper-titanium alloy will replace the application of beryllium-copper alloy in electrical and electronic industries, such as the preparation of high-strength springs, electrical contacts, mobile phone keys and so on.

Cu-Ni-Sn alloy

With the combination of high rigidity and high strength, good wear resistance

The turning performance is excellent, and it is easy to be machined into complex components.

The electrical stability is significantly better than that of beryllium copper alloy, and it does not produce magnetism, so it is a suitable material for high temperature connector and RF connector.

Cu-Fe alloy

Electrical conductivity, thermal conductivity, ductility, elasticity and other properties of copper

Wear resistance, strength, hardness, magnetism and other properties of iron

Show unique superior performance

Some views on Copper-based Materials for Automobile

The development trend of miniaturization, large electrofluidization, complex shape, dense installation and high temperature use environment of automotive connectors requires copper alloy materials to have higher strength, electrical conductivity, bending processability and stress relaxation resistance.

When selecting copper alloy materials for automobile connectors (wire harness terminals), special attention should be paid to the stress relaxation of copper alloy plates and strips. The requirement of strength is the second.

When selecting copper alloy materials for automobile connectors (wire harness terminals), special attention should be paid to the abnormal square of copper alloy plate and strip. That is, the bending processability parallel to the rolling direction is excellent, and the strength perpendicular to the rolling direction is higher.

The promotion and use of high-performance copper alloys need to be carried out under the joint efforts of the four parties of industry, university, research and application, and jointly promote the development of the automotive industry and the copper processing industry to a high-end direction.

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