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Properties and applications of beryllium and beryllium copper alloys (1)

2021-05-31 01:44:06
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Beryllium (be) was discovered in the limbalite in 1797. It is not too much in the surface, about 0.006%, which belongs to non-ferrous metals. Beryllium metal materials were produced only in 1916. In 1926, the experiment of beryllium aluminum alloy was studied gradually by adding copper. A good properties of be Cu aluminum alloy has been produced. After that, beryllium and beryllium copper alloy have become a special construction material for major purposes.

In 1940s, beryllium and beryllium copper alloy were promoted in scientific research and applied in nuclear power industry. After the 1950s, especially in recent years, the development trend is very rapid. At present, the application of beryllium and beryllium copper alloy in industrial production has been changed from the beryllium dialog box of X-ray tube in the early stage. The reducer of nuclear reactor has been transferred to the application of aerospace and airlines, and some of them have replaced the application of lead, magnesium, titanium and sodium. Because the relative density of beryllium is small, it is only 70% of lead and 40% of titanium. In addition, the elastic die of beryllium is large, so the rapid propagation of sound in beryllium is accelerated, which is more than 1.5 times larger than that of sound in steel. Beryllium or a kind of antimagnetic chemical. Beryllium also has excellent heat transfer, and its thermal conductivity is just second to silver, copper and gold. Beryllium or a very good neutron reducer digestion and absorption, the cross-section of thermal neutron is not large. In addition, there is a special feature, that is, beryllium has a high X-ray transmission coefficient, which is 16 times larger than aluminum. Therefore, it has been used in the tube windows of X-ray tube, and has also been widely used in many light-shaped structures in China's nuclear industry. Since then, beryllium has been known as nuclear metal materials and cosmospace metal materials.

Beryllium is a kind of light nonferrous metal, which has many excellent physical, physical and nuclear properties. It is decided by its internal atomic crystal structure. Beryllium has two crystal structures, the crystal change temperature is 1250C, the ultra-low temperature molecular structure is hexagonal lattice constant, namely a-be. At 180C, its lattice constant is usually calculated as a = 2286a (x10-10m), C = 3584ax10-10m). Beryllium is compared with all other metal materials and aluminum alloy. In the category of 4300c/ font>6500c, the instantaneous specific strength is larger. The solubility heat of beryllium in all metal materials is also larger, which is 3 times of aluminum, 6 times of magnesium and 4.3 times of iron.

The solubility of beryllium is higher, 1284 ° C, the ratio of aluminum and magnesium is nearly 1 times higher than that of aluminum and magnesium. Beryllium has a large specific strength, which has exceeded the titanium alloy and aluminum alloy profile, which is 4 times larger than that of steel, and maintains the compressive strength at high temperature. The specific elastic die of beryllium is also large (i.e. elastic die / relative density) is 6 times of that of stainless steel plate. The relative atomic mass of beryllium is small, the neutron capture cross section is small and the scattering cross section is especially high. Therefore, beryllium copper alloy is suitable for one of the special construction materials specified by China nuclear industry.

Beryllium has special physical properties, which has the dual properties of metal and non-metallic materials. Beryllium has a very small atomic radius, less than half of the molecule of magnesium. Beryllium has close organic chemical properties to the middle of magnesium and aluminum, and has a very common place with aluminum. Beryllium has strong air oxidation characteristics, and it can be converted into "BeO" air oxide film on the surface of beryllium in air oxygen. These metal oxides are very stable in normal temperature and high temperature red heat.



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Address: building 2-D, Qixing science and Technology Innovation Park, 666 Qixing Road, Wuxing District, Huzhou City, Zhejiang Province

Company email: cbcalloy@163.com

Company Tel: 0572-2176171

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