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Preparation of MgB2 superconducting materials breakthrough


Cooperation contract. Specified in the contract, the two tantalum and niobium tantalum and niobium mine no matter how volatile the market, should be their most annual production of tantalum-niobium raw materials sold to Ningxia Dongfangtanye Co., Ltd., the company will also be relatively fixed every year to buy two mines tantalum-niobium raw materials provided. In addition, the company will actively promote the two mines with multi-faceted cooperation, such as tantalum and niobium inside and outside the joint development of resources. (2) and the world's largest tantalum raw material suppliers - Australia Kuala Australia the company is contacted to both sides and the world of the healthy development of tantalum industry co-operation programs. (3) integration of the company of the former domestic and overseas resources development sector, vigorously develop the use of domestic and external resources of tantalum and niobium, extensive search inside and outside partners, in the next 2 years to 3 years, to take sole proprietorship, joint venture and cooperation are set up at home and abroad from 1 to Block 2 of sufficient size tantalum and niobium mine. (Tu Chun-Gen) National Superconducting arrangements coral reef Yi Cheng was a new type of superconducting MgB material, the critical temperature () is relatively high, low price, easy preparation, in the superconducting magnets and superconducting cable has a very good application. MgB superconducting materials in the preparation of the test coil and electromagnetic properties of the production of research to lead the world. Recently, the Institute of Electrical Engineering, Chinese Academy of superconductivity in the Northwest Institute for Nonferrous Metal Research Institute and the Institute of Electrical Engineering Chinese Academy of Sciences Key Laboratory of Applied Superconductivity prepared MgB wire and strip for the critical temperature and the AC loss of the test. The test batch of MgB 2 superconducting material is loaded with powder tube method (PIT) ~ IT, and then by rolling,[link widoczny dla zalogowanych], drawing and heat treatment is made. 1 The structure of wire radius circle 0.2mill the MgB superconducting core outsourcing thick layer of 0.2min iron, the outermost layer of 0.2min and then wrapped in thick copper: the structure of the radius of the wire 2, the MgB over 0.4min guided circular core outsourcing thick iron layer 0.35min; strip structure of MgB2 superconducting 2mmx0.2min side iron core wrapped in 3.1mmx0.5min in. The results show that: ① the critical temperature () stable,[link widoczny dla zalogowanych], the basic about the 36.5K; ② superconducting transition area (△) decrease from the previous 3K ~ 4K, now down to 1K, diversion temperature () basically in 35.5K or so; ③ electromagnetic performance has been greatly improved. Critical temperature stabilization and the decrease of superconducting transition region can improve the superconducting material MgB stability in practical applications. MgB superconducting material to achieve practical, but also in reducing AC loss, optimizing wire structure, preparation of a long wire size, lower electromagnetic properties of iron-based magnetic effect on other aspects for further research. (Zhang Zhengchen) Phoenix International Chung pennant narrow \Western levels of molybdenum oxide prices have risen a few dollars per pound, molybdenum alloy prices rose nearly 10 dollars, rose to $ 89 / l 【g ~ 91 美元 / l 【g. The late 20th century, 70,[link widoczny dla zalogowanych], Standard Specification for the highest price has risen to 100 U.S. dollars / l 【g. According to the analysis of a trader, molybdenum prices because of supply shortages in the final analysis, although weak demand,[link widoczny dla zalogowanych], but due to lack of capacity calcined ore, resulting in insufficient supply. Not only that the European market, the world is true. Some other traders of Chinese exports of molybdenum alloy with molybdenum oxide to reduce the international market prices of important reasons. It is reported that China's iron alloy molybdenum prices have risen to $ 82, kg ~ 84 美元 g, after the $ 79 / l 【g ~ 82 美元 g. Due to rising raw material prices of tungsten concentrates and the Chinese government cut the export tax rebate of tungsten. APT export prices rose sharply in China, has now risen to $ 285 / t ° ~ 287 U.S. dollars / ton degrees. Traders said: APT demand remains strong, prices are expected to soon reach 300 dollars / ton degrees. As the largest manufacturer - Jiangxi Tungsten Industry Corporation for equipment maintenance, will be discontinued in mid-July about 2 months, this will result in the spot market supply will decrease, therefore, market analysts believe that prices will ferrotungsten continue to rise. Allegedly, the Government will impose export duties on iron tungsten, and if the message does, tungsten prices will have increased iron potential. Magazine correspondent

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