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with that without vacuum, the microstructure of the LFC magnesium alloy under vacuum is more refined and has less precipitated β-phase, which is formed at the grain boundry and around the Al-Mn compound... of the magnesium alloy, a protective atmosphere of 0.1%SF6+CO2 was used to prevent its oxidation and burning. The metal was poured under vacuum of 0 and 0.02 MPa, and with the pouring temperature......
Trans. Nonferrous Met. Soc. China 22(2012) 2459-2464 Synthesis and photoluminescence properties of single-crystal ZnO hexagonal pyramids by PEG400-assisted thermal decomposition route LIU... pyramid structure may come from the special thermal decomposition reaction. The photoluminescence (PL) spectra of ZnO hexagonal pyramids exhibit strong near-band-edge emission at about 386 nm and weak......
Synthesis of Nano-sized Yttria via a Sol-Gel Process Based on Hydrated Yttrium Nitrate and Ethylene Glycol and Its Catalytic Performance for Thermal Decomposition of NH4 ClO4 Li Fengsheng1,Chen... exothermic peak to 337.7 ℃ by reduction of 114.6 ℃ and increases the apparent decomposition heat from 515 to 1240 J·g-1, reveals that nano-sized yttria shows strong catalytic property for AP thermal......
deleadization were carried out under vacuum. The influences of amount of sulphur, distillation temperature, vacuum degree and distillation time on deleadization were investigated and an optimal technical... be also removed effectively under certain conditions. Key words: vacuum distillation; sulphur deleadization; refined bismuth; high-purity bismuth CLC number: TF121 Document code: A 1 INTRODUCTION......
under atmospheric pressure, the vanadium separation from leachate by solvent extraction and stripping, followed by precipitation of ammonium vanadate and thermal decomposition. Under the optimum... fraction) sulphuric acid as stripping agent. After thermal decomposition the purity of powder vanadium pentoxide products is 99.18% and the overall vanadium recovery is over 81% in the whole process......
Syntheses, Crystal Structures and Kinetic Mechanisms of Thermal Decomposition of Rare Earth Complexes with Schiff Base Derived from o-Vanillin and p-Toluidine Feng Yunlong1,Wen Yihang1,Zhao.... Additionally, the kinetic mechanism of thermal decomposition of complex 3 was determined with a TG-DTG curves by both integral and differential methods. The functions of thermal decomposition reaction......
Mechanism of Thermal Decomposition of Rare Earth Acetate Hydrates王增林,庄文德,孙万明,牛春吉,唐功本,倪嘉缵摘 要:<正> The mechanism of thermal decomposition of rare earth acetate hydrates(Ln(Ac)3·nH2O,n=5,forLn=La;n=4,for Ln=Pr→Lu,Y,except Pm)has been studied by TG-DTG,DSC,infrared spectra,X-raydiffraction and chemical analysis.The thermal decomposition reaction......
EFFECT OF VACUUM HEAT TREATMENT ON OXIDATION BEHAVIOR OF SPUTTERED NiCrA1Y COATING M.H.Li1,X.F.Sun1,Z.Q.Hu1,Z.Y.Zhang1,W.Y.Hu2,H.R.Guan1 (1.Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China;2.College of Materials Science and Engineering, Hunan University, Changsha 410082, China) Abstract:A bond coat for thermal barrier coating (TBC), NiCrAlY coating......
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at several current densities to cut-off voltage of 1.4 V after being heated between two isothermal metallic tables (at 500 ℃) for 1 min. 3 Results and discussion 3.1 Thermal decomposition of NH4VO3 X-ray diffraction pattern of the product from thermal decomposition of NH4VO3 at 450 ℃ for 4 h is shown in Fig.1. The product consists of several vanadium oxides. They are V6O13, V3O7, V2O5 and VO2(B......
