Based on 60 kA bottom-cathode rare earth electrolysis cell,mathematical model was built of threedimensional electric field in rare earth electrolysis cell using finite-element analysis software.The electric filed distribution was simulated with different polar distances of 90 mm,100mm,110 mm and 120 mm,and the simulation results were analyzed.The results show that 100 mm is the best polar distance.

Extractive metallurgical technologies of tantalum-niobium are comprehensively introduced including alkalization decomposition,chlorination process,acid decomposition,fluoride fractional crystallization,solvent extraction,ion exchange and new extractive metallurgical technologies of tantalum-niobium.

Review is made of the main purification methods of gallium metal and their principles and characteristics,and the technical routes adopted by domestic companies for producing high-purity gallium.The advantages and disadvantages of various preparation technologies of high-purity gallium are compared.And the attentions are pointed out during high-purity gallium preparation.

Calcium,magnesium and boron were separated from lithium hydroxide completed liquid during carbonization with Bys-201 complexing reagent.Investigation is made on the effects of carbonization temperature and time,CO2 gas flow rate and dosage of complexing agent on complexation separation of calcium,magnesium and boron.And the optimal technical conditions were determined.The extraction rates of calcium,magnesium and boron can reach above 98% with the above process,and the produced lithium carbonate reaches the national standard for battery-grade lithium carbonate.

Flaky-cluster Co3O4super-hydrophobic surface was successfully prepared on on aluminum substrate via hydrothermal method.The phase composition and surface morphology of the precursor and terminal product were detected by X-ray diffraction and scanning electron microscopy.The effect of reaction time on Co3O4 surface morphology was investigated,and microstructure evolution with reaction time was analyzed in details.The lubrication performance of Co3O4super-hydrophobic surfaces were analyzed with Cassie-Baxter composite model.Finally,the impact resistant stability of Co3O4super-hydrophobic surface was tested with high pressure water column.The results show that flaky-cluster Co3O4super-hydrophobic surface prepared by 10 hreaction has the best super-hydrophobic performance and good water impact resistant stability.

Isothermal compression experiments of TA15 titanium alloy were conducted on Gleeble-3500 thermal simulator with strain rate of 1~0.01s-1 and deformation temperature of 900~1 050 ℃.The results show that thermal deformation behavior of TA15 titanium alloy near the phase transition point can be described by a constitutive equation in hyperbolic sine function form including Zparameter.Within the experimental parameter range,with deformation temperature and strain rate gradually increasing,microstructure and thermal deformation mechanism of TA15 titanium alloy change,resulting in deformation activation energy increased firstly and then decreased.Thermal processing map and deformation microstructure analysis show that when thermal deformation happens in the upper part of two-phase region(about 950℃)at a lower strain rate(0.1~0.01s-1),the energy dissipation efficiency of the alloy is higher and its microstructure has uniformly distributed fine grains due to complete dynamic recrystallization.

The effect was investigated of 0.5% Sb addition on microstructure and mechanical properties of Mg-5Y-3Sm-0.8Ca alloy by microstructure analysis and tensile tests.The results show that high meltingpoint Mg3Sb2 phase is formed and the grain size is refined in the alloy with 0.5% Sb.The room/high-temperature mechanical properties are improved of Mg-5Y-3Sm-0.8Ca-0.5 Sb alloy,with room-temperature tensile strength of 266 MPa and 300 ℃tensile strength of 208 MPa.Therefore,Mg-5Y-3Sm-0.8Ca-0.5Sb alloy has superior tensile stability to the commercial heat-resistant magnesium alloy WE43.

Cordierite-mullite multiphase material was prepared by solid sintering with iron tailings as raw material,and knar clay,Suzhou soil,burn talc and alumina powder as auxiliary material.Performance indexes of the multiphase material were measured including apparent porosity,water absorption,linear shrinkage ratio,bending strength and thermal shock resistance,and then the effects were investigated of the factors on material performance such as molar ratio of cordierite to mullite,amount of iron tailings and calcination temperature.The crystalline phase and microstructure of the multiphase material were analyzed by XRD and SEM.The results show that the highest bending strength is 29.79 MPa and thermal shock resistance experiment reaches 72 times for the synthetic material mainly composed of cordierite and mullite crystals with a small amount of liquid but no other impurity phase.

Molybdenum rods are cogged and processed using a new three-hammer radial rotary swaging machine,effectively improving quality of molybdenum material cogging and increasing production capability.

Research progress is introduced of preparing three-dimensional ordered macroporous(3DOM)inorganic material with various template methods.The advantages and disadvantages,application and development of the template methods are described in detail,providing a useful reference information for further exploration and research of 3DOM inorganic material.