BaSn1-xSbxO3 ceramic powder was synthesized by solid-state reaction and then immersed in cupric acetate and dried to prepare BaSn1-xSbxO3 CuO composite powder by solid-state reaction at first and then prepare Ag/BaSn1-xSbxO3 CuO composite powder by mechanical mixing with Ag powder.Meanwhile,Ag/BaSn1-xSbxO3 CuO composite powder was prepared by mechanical mixing of the powders.And then the composite powders from the above two processes were sintered by the same process to prepare Ag/BaSn1-xSbxO3 CuO electrical contact material.Density,bending strength and resistivity of the two electric contact materials were compared.The results show that CuO can be distributed more uniformly in BaSn1-xSbxO3 composite powder by solution immersion to greatly accelerate powder sintering and improve material microstructure and the comprehensive performance of Ag/BaSn1-xSbxO3 CuO electrical contact material.

CuSO4was reduced by precipitation transformation with C6H12O6 under alkaline conditions to obtain brick red Cu_2 O.And then Cu_2 O was transformed into Cu_2 S with Na2 S as the vulcanizing agent.Cu_2 S was calcined at different temperatures to prepare nonstoichiometric Cu_2-xS compound.Phase and morphology of Cu_2 S and Cu2-xS were analyzed by XRD and SEM,respectively.The results show that phase transition of Cu_2-xS happens at different temperatures.The molar ratio of Cu to S increases with the increase of roasting temperature.And Cu2-xS exists steadily in the form of Cu_2 S when the sintering temperature is up to 700 ℃.

The synthesis methods ofβ(β″)-Al2O3 electrolyte powder are mainly reviewed including solid state reaction method and wet chemical method.Some common preparation processes from the two synthesis methods are introduced.And the application development is reviewed ofβ(β″)-Al2O3 electrolyte ceramic in energy storage battery,thermodynamic study,sensor and so on.

WC-Co cemented carbide blend was prepared by addition of antioxidant,pH regulator and defoamer with pure water as the wet milling media to replace conventional reagents,i.e.ethanol,petrol,acetone,hexane and heptane.The properties of prepared WC-Co cemented carbide sample are the same with that of the sample prepared with conventional reagents.Meanwhile,this process has the advantages of high security,low cost and environmental friendliness.

WC powder was used as raw material with Fisher particle size of 13μm,which was blended based on total carbon content of 5.96%,5.94% and 5.91%,respectively,with 9% Co.The blend was prepared by rubber technology,then it was pressed and sintered to obtain cemented carbide product.Shrinkage coefficient of the cemented carbide product was investigated.The results show that the shrinkage coefficient of WC-9%Co cemented carbide product decreases with increased WC total carbon content in case of the same ball milling process,forming mode,sintering temperature and heat preservation time and the similar alloy magnetic saturation.

Laser welding of 45#steel to 4mm thick YG20 cemented carbide was achieved with 5kW fiber laser as the heat source.Distribution characteristics of weld microstructure were analyzed,and surface morphology was observed of the weld etched in HNO3,H2O2 and Murakami reagent,respectively.And then the influence was discussed of laser scanning speed on weld formation between dissimilar metals with relatively large thermal expansion coefficient difference.The results indicate that when welding materials are 4mm thick,YG20/45#steel welded joint with excellent metallurgical bond can be obtained under the conditions of 3.84 kW laser power,0.96m/min laser scanning speed and-8mm defocusing amount.

Cr-doped APT powders were prepared by doping chromium acetate during ammonium paratungstate crystallization,and then their physicochemical properties were studied.The results show that the impurity elements are in line with the standard of APT-0in GB/T 10116—2007(Ammonium Paratungstate)except for chromium element.Chromium exists in APT powders mainly in the form of amorphous chromium hydroxide.As growth of APT crystal is inhibited by amorphous chromium hydroxide precipitated before APT,Cr-doped APT has smaller particle size,lower bulk density and slightly wider particle size distribution than ordinary Cr-free products.Cr-doped APT powders have macroscopically and microscopically uniform composition.

Scandium was extracted and recovered from the acid leaching solution of tungsten residue with primary amine N1923 as the extractant.The effects were studied of solution acidity,extractant volume fraction,phase ratio and extraction time on scandium extraction as well as the effect of hydrochloric acid concentration on scandium stripping.The results show that the extractant of primary amine N1923 has a good selectivity to scandium.The optimum conditions for extraction are as follows:solution acidity 0.25mol/L,extractant volume fraction 10%,O/A phase ratio 1∶1,and extraction time 5min.The proper stripping agent is 3.5mol/L dilute hydrochloric acid.Under the above optimum conditions,the extraction rate of scandium reaches 96.42%,the stripping rate is 98.28%,and the total recovery rate of scandium extraction is 92.33%.

时光荏苒,岁月如歌,历经六十载的砥砺磨练,长沙有色冶金设计研究院有限公司迎来了甲子华诞。六十年前,新中国成立之初,国家一穷二白,百废待兴。国家'一五'计划发轫,加快工业化建设的步伐。

ScB2was prepared by carbon thermal reduction in vacuum at high temperature with Sc2O3,B4 C and C powder as the raw materials.Qualitative and quantitative analysis was made of product phase composition by XRD and Rietveld whole pattern fitting.The results show that ScB2 synthesis rate can be more than 99% by carbon thermal reduction with Sc2O3 and B4C as the raw materials and appropriate amount of C powder as the reactive agent.