ugg italia YBCO film surface reaction and the stab

YBCO film surface reaction and the stability of long

Ⅲ spit by ammonium carbonate and aluminum, magnesium, zirconium salts of the interaction of the reaction. Subsequent thermal oxidation of medium enrichment and thermal decomposition to produce a MgO ZrO2 A1203 a series of ultra-fine powder, particle size from O. 0m to 0.5 # ra. The use of such powders to form a high thermal shock sintering materials. Ah03 a 2 is the specific surface area powders decomposed in solution followed by 10.5m, g. Different types of solutions are usually dry (acetone, alcohol, kerosene, aerosol, refrigeration, powder annealing). L5 ・ can be listed zirconium oxide powder production methods based on individual group. Parameter selection should be changed to eliminate uncontrollable reaction of lanthanum. Obtained by these methods of powder particle size of 0.1 ~ 0. Pyrolysis in the powder pan followed by 1 ~ m. Therefore, the oxidation and the oxidation of Nuo Nuo system based Preparation of powder characteristics and methods are closely related. - Production method of choice depends on the material used in the field, production and powder to be achieved, the necessary level of performance. (Zhang only) floating in the water density of magnesium alloys 1.74g / ~ ~ 3, is the smallest structural metallic materials. 2o0 ℃ above the good processability, optical match with aluminum units. But when less than 200 ℃. Magnesium alloy hexagonal structure, processing of the poor. At room temperature for plastic processing, the whole crack, which mainly uses the casting shape. When more than 6wt% magnesium lithium and Canada, can a body-centered cubic crystalline phase, cold resistance has been significantly improved. When adding 12wt% Li, for single-phase organization. More good cold resistance. Can be nearly 100% of the processing. Taijin lithium content increases the density increases with the decrease. The lithium content was 33%, the density of Iglcm3. Yang et al Japanese island of La was prepared by melting the density of 0.95g / C ~ 23,[link widoczny dla zalogowanych], that is floating in the water of the Mg-Li system Taijin, and to investigate its processing properties and mechanical properties. In order to obtain 0.95g / ~ ~ 3.3-density Mg-Li alloy, must be added about 37% Li. Adding solid solution strengthening or precipitation strengthening 5wt% A1 or Zn,[link widoczny dla zalogowanych], step 3 elements. Must add more lithium. Of the alloy melting point 400 ~ 50o ℃. Even more than with lithium content, as long as temperatures remain low, due to evaporation, oxidation caused by the loss of control turning raw materials containing lithium 20v ~% at the same level, so that the use of lithium was 90%. However, when melting around a small amount of moisture, lithium will instantly gasification. Thus difficult to melt human magnesium, but also dangerous. Magnesium melt in the atmosphere itself can also cause nitrogen and oxygen and exothermic reactions and severe burns. Yang, who take advantage of the island the previous study Mg-Li alloy smelting technology know-how. High frequency induction furnace in an argon atmosphere, flux-free alloy melting, the alloy composition according to the target density of 0.95 calculated l6 ・ weighing, the magnesium (purity 99.9%) and aluminum (purity 99.7% ) or zinc (purity 99.9%) in a soft steel crucible, lithium (purity 99.97%) is to maintain the furnace in addition spoon. First, the vacuum furnace up to 2.7 × 10-2Pa,[link widoczny dla zalogowanych], and then filled into 2.0 × 10Pa pressure of hydrogen, magnesium and aluminum or zinc to be completed after the melt, heated to 800 ℃, add lithium, to be completely molten lithium later. At 700 ℃ by high-frequency power on and off. For melt flow, so that homogenization, immediately cast into the inside spray BN 150ram ~ 100mm × 30mm metal mold. Mg-Li alloy from the density by the Archimedes method to 0,95 g/cm3. Mg-Li binary Taijin Vickers hardness (Hv) of about 11, add the aluminum alloy is 12, adding zinc to 8,5. Various Mg-Li system Taijin reduction in the rate of 90% under the cold, investment has lead to hardening. After processing by 90% edge cracking, which is too binary Taijin the edge cracking, edge cracking triple gold homes were smaller. This is because by the end of the test material off the surface precipitation of lithium-magnesium oxide solid solution caused the increase of aluminum or zinc Taijin, the surface layer than the binary alloy stability, and inhibit the removal of lithium. Reduced edge cracking. Reduction rate of 95% of the test material stress / strain curve. Show that the increase with the stress Taijin. Strain was straight up. After reaching the yield strength,[link widoczny dla zalogowanych], decreased marrow stress, strain increases, that is, the Taijin at room temperature also shows the creep behavior. Increase the yield strength of aluminum alloy, followed by the binary alloy, the smallest is the control and zinc alloy, which in turn is 3o, 22 and 20MPa. Tian and zinc alloy, the elongation,[link widoczny dla zalogowanych], with almost 200%. Tian added about 130% aluminum alloy.

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