Technetium is a chemical element. Chemical symbol Tc, atomic number 43, belongs to group VII B of the periodic table and is an artificial radioactive element. All technetium isotopes with mass number of 90 ~ 1 10 have been found, and the isotope with the longest half-life is technetium 98. 1937, Italian C. Periel and American E.G. segre bombarded molybdenum with deuterium, and made element 43 for the first time, and named it technetium, which comes from the Greek technetium and means "artificial". Technetium is the first chemical element synthesized by artificial method. Later, some technetium isotopes were separated from the fission products of uranium, and many technetium isotopes were also made by the nuclear reaction of molybdenum, ruthenium and niobium. Only a very small amount of technetium 99 has been found in nature.
Technetium is a silver-gray metal with melting point of 2 172℃, boiling point of 4877℃ and density of 1 1.487 g/cm3. At high temperature, technetium reacts with oxygen to generate volatile Tc2O7, which is a pale yellow solid, and another stable oxide is TcO2. The oxidation states of technetium are+1, +2, +3, +4, +5, +6 and +7, among which compounds with valence of +4 and +7 are the most stable. Technetium 7 exists in the form of TcO4- in solution, which is oxidizing and can be reduced by divalent tin salt, concentrated hydrochloric acid and ascorbic acid. In alkaline solution, TcO4- can be easily reduced to. In neutral solution, disproportionation will occur:
Tetravalent technetium exists as positive ion Tc4+ in acidic solution and as form in alkaline solution.
Technetium in tons can be obtained by separating the fission products of the reactor. At 500 ~ 600℃, technetium sulfide or high technetium ammonium can be reduced by hydrogen to produce metal. Technetium 99 is the most widely used medical nuclide in clinical diagnosis of nuclear medicine, which can be used for imaging diagnosis. High technetium salt is a good corrosion inhibitor for steel.
In 1936- 1937, it was made by hand for the first time. 1at the end of 936, the young Italian physicist Siegel went to Berkeley for further study. There he used an advanced cyclotron to irradiate molybdenum with deuterium to obtain technetium. However, separating technetium from molybdenum is an arduous task, so he took the irradiated molybdenum back to the University of Palermo, Italy. With the help of Pierre, a chemistry professor, he separated the 99Tc isotope of 10- 10 g in the past six months, and determined that the properties of this new element are very similar to rhenium, but not very similar to manganese.
Technetium is known to have four isotopes, all of which are radioactive, and the longest half-life is 98Tc, 4.2× 106. Technetium has now reached several tons of output, which is extracted from the fission products of nuclear fuel. Technetium is silvery white, but it is usually gray powder, which has oxidation resistance and little solubility in acid, so it can be used as anticorrosion material for atomic energy industrial equipment.
Suzhou solid technetium
The company is mainly engaged in diode manufacturing and packaging testing, ranking fifth in the domestic discrete device industry in 2005. Among the top enterprises, only Suzhou Solid Technetium specializes in diode manufacturing and packaging testing, and the income of other enterprises includes a large number of sales income of integrated circuits, triodes and power tubes. The growth of discrete devices in semiconductor industry is lower than that of integrated circuits, while the growth of diodes in discrete devices is relatively stable. Therefore, the company's business is too concentrated on diodes, which has affected the rapid growth of sales revenue in recent years.
The company's comprehensive gross profit margin reached 23% in 2003 and decreased to 18.7% in 2004. As can be seen from the change of gross profit margin of the company's main products, it is mainly affected by the decline of gross profit margin of shaft, shaft (VGS) and MB, which accounted for 83.5% and 72. 1% of revenue in 2003 and 2004 respectively.
The decline in gross profit margin of main products was affected by the decline in product prices, and the prices of raw materials such as copper and monocrystalline silicon rose, among which the prices of the most important raw materials, crystal grains and wafers, rose by 28.2% and 65,438+06.5% respectively in 2003-05.
Affected by the high gross profit margin of LLP products, the gross profit margin stopped falling in 2005 and increased in the first half of 2006.
Our company is a professional company specializing in diode manufacturing and sales. The advantage of this major is that it can be done well, but the disadvantage is that its profitability is easily affected by the overall development of the diode industry.
In recent years, the semiconductor market and industry in China have developed quite rapidly, far exceeding the global average. However, the development of integrated circuits and discrete devices in the two main sub-industries of semiconductors is different. The scale of discrete devices is relatively small, and the growth of integrated circuits is stronger than that of discrete devices. In 2005, for example, the market size of discrete devices was only 17% of that of integrated circuits. The compound growth rate of discrete devices from 0/kloc-0 to 05 is 26. 1%, and the compound growth rate of integrated circuits is 35.0%.
According to CCID forecast, the compound growth rate of output value of integrated circuits in China will be above 25% in the next few years, while that of discrete devices will be about 19%.
This difference is caused by the integration trend of semiconductor industry. After long-term integration development, all the devices that are easy to integrate have been integrated, and the rest are not suitable for integration, and those that are uneconomical after integration remain in the discrete device industry. Discrete device products are mainly universal, and the update is slow. Therefore, the development of discrete devices mainly increases with the demand of downstream products. As China is becoming a global manufacturing center, the demand for discrete devices is growing rapidly, and the manufacturing capacity of foreign manufacturers is transferred, the domestic growth is much higher than the international average.
The growth in the field of discrete devices is also mainly manifested in the growth of some new products such as photoelectric devices and products with faster replacement such as power devices. The growth of diodes and triodes is relatively stable. From 2003 to 2005, the domestic diode market sales increased by 24.5%, 37. 1% and 10. 1% respectively. In 2005, domestic diode sales amounted to 7.73 billion yuan, accounting for 12% of the total market value of discrete devices. According to CCID's forecast, the compound growth rate of domestic diode demand in 2006-20 14. 1% will reach149.53 million yuan by 20 10.
At present, more than 90% of the company's sales revenue comes from exports, mainly in Europe, America and Greater China (including Hongkong, Taiwan Province and Southeast Asia). Europe and America are the main sources of OEM customers. Due to the strong demand of electronics processing industry in Greater China, this area is also the traditional key area for export sales of the company; Because of their important position in the consumer electronics industry, Japan and South Korea are also the key sales areas of the company.
As the RMB is currently in the process of appreciation, too much export share will lead to greater exchange rate risk for the company. At present, more than 90% of the company's income comes from exports, and overseas procurement accounts for more than 60% of the total procurement. According to our calculation, the company's overseas procurement accounts for 40% of overseas sales revenue. After offsetting this part, 54% of the company's sales revenue still faces exchange rate risk. If the company does not take measures such as price increase, the company's profit per 1 billion yuan will be reduced by nearly 500,000 yuan for every appreciation of RMB.
In recent years, the company's OEM accounts for 40-50% of sales revenue, with a high proportion. At present, the company's OEM customers include VGS, VSA, SHD and NIEC, all of which are major manufacturers of semiconductor discrete devices in the world, among which VGS and VSA are wholly-owned subsidiaries of VSH, one of the largest manufacturers of discrete devices in the world.
Although the company can improve its popularity, reduce sales expenses and market risks and obtain relatively stable market demand by OEM for internationally renowned manufacturers, overall, the gross profit margin of OEM products is lower than the overall gross profit margin of the company, and the company is suspected of working for a big factory.
Therefore, companies should strive to increase the proportion of their own brands and domestic sales. However, at present, the competition in the domestic market is fierce. On the one hand, international brands occupy an important position; On the other hand, there are about 130 domestic manufacturers engaged in diode production, among which well-known enterprises such as Changdian Technology, Huawei Microelectronics, Leshan Phoenix, Shenzhen Saiyifa, Wuxi Huarun Huajing and Tianjin Zhonghuan have considerable strength in discrete devices, so it is not easy for the company to expand its domestic sales.
All the funds raised by the company are used for the technical transformation projects of glass passivated super rectifier diode (GPP) and Schottky diode (Sky) production lines. This project will increase the proportion of middle and high-grade products in the company's product structure, improve the chip self-sufficiency rate and reduce the cost.
The main products of Liang Dong New Materials Company include electrostatic powder spraying, fluorocarbon resin spraying, electrophoretic coating, stainless steel color-coated aluminum profiles, etc.
Both companies are average, and it is estimated that Suzhou Gushu will increase even more on the first day of listing.
Personally, I think it's better to subscribe to Golden Mantis.