With the rapid development of electronics in China, especially the rapid development of the mobile communication industry and the trend of high-performance, miniaturization and integration of electronic information products, the power density and calorific value of electronic equipment and electronic devices have increased significantly, resulting in The risk of circuit instability is increasing, so the heat dissipation problem of the equipment is becoming more and more prominent. Especially for products such as aerospace electronic devices, portable appliances, and electronic information on vehicles that are sensitive to weight loss requirements, the requirements of the heat dissipation system will be Higher and more complex, not only requires excellent thermal conductivity-heat dissipation performance, but also must have the characteristics of light weight, high strength, convenient transportation and installation, low cost, low environmental interference, recyclable and so on. In addition, the 5G network being deployed by the country, the city distribution density will be 5-6 times that of 4G, and the power load of a single 5G base station will be more than 5 times that of 4G base station. It can be seen that while the 4G network continues to advance, it will deploy 5G With the increase of base stations, the demand for heat sink materials for base station components will increase more than twenty times.
The heat dissipation materials of current mobile communication base stations and mobile communication equipment are mainly aluminum alloys and copper alloys. The thermal conductivity of copper material (thermal conductivity at room temperature) is 397 W / m · K, and that of brass is 109 W / m · K. Because of its high density and high device quality, its application is limited; the current mainstream radiator material is aluminum alloy and pure aluminum The thermal conductivity at normal temperature is 238 W / m · K, but the thermal conductivity of ordinary aluminum alloy is less than 150W / m · K; the thermal conductivity of pure magnesium at room temperature is 157 W / m · K, while the existing commercial magnesium Alloys such as AZ31 have a thermal conductivity of about 78 W / m · K, AZ91 has a thermal conductivity of about 55 W / m · K, and AM60 has a thermal conductivity of about 61 W / m · K, which is much lower than that of pure magnesium .
Recently, the team of China Light Alloy Material Technology Leader CDTZ Lightweight Technology Co., Ltd. and Xi'an Jiaotong University Transportation Equipment Lightweight Research Institute have successfully developed a high-performance, high thermal conductivity and superplastic magnesium alloy. The thermal conductivity is up to 165 W / m · K, the tensile strength is 270 MPa, and the elongation is up to 30%. Its thermal conductivity is comparable to that of high thermal conductivity aluminum alloys, higher than most aluminum alloys, even higher than bronze (32 ~ 153 W / m · K) and brass (70 ~ 109 W / m · K), and the heat dissipation rate of magnesium alloy devices is about 3 times that of aluminum alloy devices, and the density is 64% of aluminum alloy devices. If the magnesium alloy and the aluminum alloy (thermal conductivity 150 W / m · K) are used to manufacture the same heat sink, then “specific heat dissipating capability” is used to measure the heat dissipation capacity of the two heat sinks per unit mass The ratio is 1.71: 0.36, that is, the heat dissipation efficiency of the magnesium alloy radiator is 4.7 times higher than that of the aluminum alloy radiator. It can be seen that the cost performance of this magnesium alloy radiator is much higher than that of the aluminum alloy.
High-conductivity ultra-high plasticity magnesium alloy avoids the use of expensive elements and high-value, high-content rare earth element alloying schemes through rational and economic composition design and original smelting and casting methods, and optimizes the smelting-forming process to ensure high strength On the basis of low cost, the comprehensive mechanical and physical properties of magnesium alloys are improved, especially the high thermal conductivity (135 ~ 165 W / m · K) and good room temperature plasticity (> 30) comparable to aluminum alloys %), Which provides better material options for highly functional and lightweight applications in the field of electronic information. At present, the material preparation and processing technology of the high thermal conductivity magnesium alloy have applied for national invention patent protection.
Therefore, the development and promotion of high thermal conductivity and ultra high plastic magnesium alloy radiator materials will achieve the following major progress:
(1) Efficient heat dissipation, improve the safety and service life of electronic information systems, extend maintenance and repair cycles, and escort the long-term safe use of 5G base stations, upgrade and accelerate the construction of digital infrastructure;
(2) Lightweight equipment, portable, easy to install and maintain, reducing operation and maintenance costs;
(3) Make full use of China's own huge amount of magnesium metal resources to achieve green and sustainable development;
(4) The high electromagnetic shielding properties of magnesium alloys will play a major role in the electromagnetic protection and information confidentiality (special communication equipment) of operation and maintenance personnel.
About CDTZ Lightweight Technology Co., Ltd.
CDTZ Lightweight Technology Co., Ltd. was founded in 2003. It is a high-tech material research and development enterprise established by members of the Southwest Jiaotong University Transportation Equipment Lightweight Research Team to develop and produce transportation equipment lightweight technology and products, technology and industrialization consulting. Etc. are the main business. At the same time, the company is also a lightweight material and product test R & D base for the “National Laboratory of Rail Transit”, “State Key Laboratory of Traction Power” and “Research Institute of Key Materials of Rail Transit” of Southwest Jiaotong University. "Achievement transformation base.
The company is committed to the development, processing and application of lightweight metal structural materials (magnesium alloys, aluminum alloys, titanium alloys and their composite materials), and is a high-tech enterprise engaged in research and transformation of applied technologies. It is mainly oriented to rail transportation equipment, new energy vehicles, and aerospace. Lightweight design of structure, material preparation and processing, optimization of structure and mechanism design, vibration and noise reduction materials and structures, numerical simulation of material forming process, forming processing technology, product development and production, and mold design. At present, it has more mature conditions for the research, development, design and manufacture of lightweight materials such as magnesium alloys and aluminum alloys.
Products
Magnesium alloy precision profiles
Magnesium alloy / aluminum alloy forged products
Magnesium alloy / aluminum alloy welding products
Magnesium alloy / aluminum alloy honeycomb products
Self-soluble magnesium alloy products
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In December 2017, the company's R & D and production of extruded side wall profiles and floor guide groove magnesium alloys was successfully accepted and delivered to the "Fuxing" high-speed train. The total length of this batch of products reached about 10,000 extension meters, which was successfully installed on 11 trains in this batch. The company also delivered two batches of approximately 10,000-meter-long extruded magnesium alloy profiles, which are expected to be installed on 25 subway trains. Tianzhi Company successfully opened the full technical process of material design, extrusion molding simulation, mold optimization design, extrusion process parameter optimization, on-site fine regulation and control, orthopedic sizing of profiles. Alloy precision extrusion profiles have made important progress and breakthroughs in magnesium alloy precision extrusion technology. Fuxing is a high-speed train with the highest operating speed in the world. After the installation of magnesium alloy profiles, the lightweight interior of the EMU has been upgraded and the important goals of energy saving and weight reduction have been achieved.