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Nd2 (Fe, C0, Al, Cr) 14B/α-Fe nano-composite structure and magnetic properties of magnetic materials

0nm. 1020K ~ 1070K in the 30s under the hot dense obtained after large magnets, particle size increased from 50nm ~ 90nm. XRD diffraction analysis using its organizational structure, observed during grinding, annealing before and after annealing at different stages of the powder morphology; with 9800EDAx analyzer to observe the structure and chemical composition; with HRTEM analysis of the product phase, image analysis, while using transparency and nano-level axial detection method. External magnetic field increased to 2.5MA / m case, with the hysteresis loop detected magnetic mapping. The corrosion experiments were 2003 through Metal Bulletin 1O cut had their 25 minutes of immersion corrosion test solution (3% NaCl solution and dissolved 50mV/min scanning speed) at 320K in the humid atmosphere of completion. All powders were prepared by HEBM magnetic isotropic. Late in the ball milling Fe and Co form a homogeneous mixture. During heat treatment, Co can replace part of Nd2Fel4B phase Fe, improving the hard magnetic phase of the Curie temperature, but also the formation of soft magnetic phase Fe-Co, to improve their saturation magnetic pole strength. Add Al, Cr can inhibit the grain growth and improve the magnet remanent polarization and hysteresis loop squareness. Hot N HR1EM also F1.49 observed a CozAi0.17.34B/a-Fe (1.%) Than two-phase nanocomposite structure, but the multi-phase structure, which is the main phase Nd2Fel4B, a small amount of NdFe4B4 ternary phase and small Fel7Nd5 binary phase mixing. Heterogeneous structure is composed of five energy steps and stages of the process formed the argon melting,[link widoczny dla zalogowanych], homogenization process, high energy ball milling, heat treatment and hot. The last one the most important process, because it can form a new phase or metastable phase disappear. XRD analysis showed that,-Fe phase content increased, remanent polarization of the thermal stability of temperature coefficient a (j) and the intrinsic coercivity temperature coefficient p (iI-L) have increased, the increase of excess iron can increase the Curie temperature and iHc still maintain better value. Added Cr and Co to speed up the passive role of adding at least lat% Cr useful antioxidant effect. Coated with Zn (10 / ~ m) of the magnet is very sticky, and humid environment in the corrosive medium in the power of good corrosion resistance,[link widoczny dla zalogowanych], oxidation resistance increased significantly, with a more stable remanence and coercivity. ~ 2Feli. 49CozA10.17Ct0.34g / ~ a Fe (3f7.5vo1.%) Of the remanent polarization is 1.02T, the intrinsic coercivity of 690kA / m. Can be made about the density of hot 7.6g/cm3, J of about 0.9T, iI-L of about 600kA / m, (BH) one of about 150kJ / m anisotropic magnets, the corrosion rate of 0.037mm / a; while that of soft magnetic phase (a-Fe 0) in the Nd2Fel4B remanence nanocrystalline magnetic low, a = Jr / J = 0.59, intrinsic coercivity iI-L = 875I/lm. (On the Ping) Australian Magnesium Magnesium corporate restructuring projects June 13,[link widoczny dla zalogowanych], 2003, Australian Magnesium Corporation project in Queensland and the shareholders to sign a restructuring agreement. The agreement will be the company and the company's magnesium Stoll (Stawel1) of magnesium in financial difficulties to restructure projects. Magnesium Corporation project will be based on the completion of its current, Magnesium technical progress and R & D alliances have been established to re-develop a business plan Magnesium. Stoll project is to build a magnesium plant, with an annual output of magnesium 9000t, magnesium alloy 7000t,[link widoczny dla zalogowanych], cost about 13 billion Australian dollars (8.65 billion U.S. dollars), plans a total investment of 1.7 billion Australian dollars. According to magnesium for the first time the company disclosed in April 2003, the project's basic engineering spent 200 million Australian dollars, currently in maintenance of the state, the company reduced staff from 230 to 350. The principal terms of agreements including the termination of Leiden (Leighton) entered into by the contractor and magnesium construction contract, the formation of joint ventures, maintenance, and increase the project assets for future development use. It is believed that restructuring is necessary because the magnesium within the stipulated time the company has been unable to maintain the balance sheet. Enables companies to deploy and re-evaluation of magnesium other development options,[link widoczny dla zalogowanych], continue to find new business partners. In 1997, the Magnesium Corporation and the U.S. auto magnate - Ford Motor Company signed a 10-year supply contract, would yield half of the magnesium plant Stoll (45000t / a) to sell this car company. This is Stoll project's main financial support. Australia's determination to support the provincial government and Stoll magnesium construction projects, but the investment will not be more than 370 million Australian dollars. (Zhang Wenyan Sun Hongzhi)

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