1. Copper plate belt is the field with the highest barrier in copper processing industry.Connector as an important downstream of copper strip, the consumption of strip is large.As the chip carrier of integrated circuit, lead frame also belongs to connector.With the aid of bonding material, it realizes the electrical connection between the leading end of the circuit inside the chip and the external connection, and plays the role of bridge with the external conductor connection.In addition to high strength and high thermal conductivity, it also requires good brazing property, stamping property, etching property and adhesion of oxide film particles.Copper - iron series, copper - nickel - silicon series C70250 production.
2. Cu-ni-si and Cu-CR-ZR alloy strip belong to medium and high strength and high conductivity alloy. Domestic Bowie alloy has been mass-produced, and Xingye Shengtai Copper Industry can mass-produce Cu-Ni-SI alloy.Only Oriental tantalum industry can produce Beryllium copper (CU-BE) in China, but Cu-TI domestic companies cannot supply it.Cu-ni-si alloys, in particular, have been widely used in the field of electronics due to their excellent high-temperature stability.
3. Copper-nickel-silicon alloy has excellent comprehensive performance, increasing permeability and great potential.The trend of electronic products miniaturization and carrying capacity enhancement is obvious.In large current connection occasions, such as base station power connector, new energy vehicle connector and smart phone connector, highly conductive cu-Ni-Si alloy can suppress heat and temperature rise, forming a strong substitution effect for other copper alloys, such as brass, tin phosphor bronze, etc..
4. Car connectors are more heat resistant than smartphones.The temperature environment inside the car: engine 120℃, engine surface 135℃, instrument panel surface 120℃, interior floor 105℃, rear deck 117℃.When people take a car without air conditioning, the temperature inside the car can reach 120℃.Car connector brass, tin phosphor bronze has been unable to meet the requirements of use.Need to switch to titanium copper or copper nickel silicon with better stress relaxation resistance.Titanium copper is produced abroad only at present, processing fee is as high as 200 thousand yuan/ton.Copper, nickel and silicon processing cost in 20-30 thousand yuan/ton, comprehensive cost performance advantage is obvious.
5. High performance and low cost products such as C42500, C41125, PW33520 (exclusive patent product of Bowie Alloy) have been developed at home and abroad to replace tin phosphor bronze.Among them, the yield strength and conductivity of the domestically developed PW33502 alloy are 570Mpa and 34%, twice of the original C5191, which can meet the requirements of high transmission and low temperature rise.Bad direction bending performance is also better than the original C5191 obvious.The tin content is lower than C5191, and the tin and nickel plating can be recovered.Compared with tin phosphor bronze, it has excellent comprehensive performance and high cost performance.
6. China's copper processing industry has gone through three stages, and now it has entered the stage of high-performance materials represented by C7025.To meet the needs of telecommunications, electronics and automotive industries such as upgrading.Xingye Shengtai Copper Developed C7026 and C7035 copper-nickel silicon materials.C7035 has excellent performance and can partially replace low beryllium copper alloy.
7.C18150/C18400 -- strength 600MPa with 85%IACS conductivity and 330W/(m·k) thermal conductivity, it is the most ideal copper alloy in the area of high conductivity and medium strength, with very high stress relief and high temperature softening characteristics.Applications: high-current connectors, oil-electric hybrid charge-discharge connectors, battery flash charging, high-power relays, terminals and efficient thermal management solutions.
8. The future development of high-performance copper alloys may be in the following four directions :(1) double 70 alloys with tensile strength of 700MPa, conductivity of 70%IACS, thickness of 0.03-0.06mm;(2) environmentally friendly materials, tensile strength > 1000 MPa, yield strength > 950 MPa, conductivity > 45% IACS;(3) New composite materials can make use of the characteristics and advantages of various metal varieties to improve the comprehensive performance and optimize the cost;(4) Magnetic conductive materials, CFA copper and ferroalloy products, general iron content of 15-50%.
9. Japan's high-end strip is in short supply.Due to the rapid development of China's copper strip industry, Japanese enterprises can only produce high-end copper strip for survival, such as copper nickel silicon series, copper chromium zirconium series, beryllium copper, titanium copper, etc.Japanese copper belt (excluding brass) production rose from 190,000 tonnes in 1991 to 270,000 tonnes in 2018, accounting for 33 per cent of the copper processing industry, up from 15 per cent.The increment is mainly from :(1) semiconductor lead frame, etching type;(2) Automobile connector;(3) Low insertion force reflux tin plating process;(4) Tin bronze, Corson alloy, titanium copper, beryllium copper for mobile phones.As a result of enterprise merger and product upgrade, copper strip industry processing fees rose.
10. As demand improves and auto electronics grows, Japanese companies are starting a new round of investment.Downstream for Japanese companies: The Internet of Things, artificial intelligence, big data, autonomous driving, electric vehicles and other emerging industries on semiconductors and sensors.These downstream will drive long - term high - performance copper strip demand.
