Study is made of the preparation of niobium suboxide by Mg reduction.Niobium Suboxide powder is prepared by mixture grinding-reduction roasting-acid washing for impurity removal-drying.Study is made through XRD and SEM on the product phase and microscopic morphology.Anode is made from niobium suboxide powder with the process similar to that of tantalum electrolytic capacitor.The anode electrical property is tested with anode testing method of electrolytic capacitor.The results showed that Mg reduction process is difficult to control with complex product phase,coarse particle size,simple particle shape.The resultant anode is characterized by low specific capacity,high ESR and high leakage current.

The high-temperature anti-oxidized Si-Cr-Ti coating improved on C-103 niobium alloy is prepared by slurry sintering with the addition of active Zr element and Y_2O_3.Static anti-oxidization test at 1 200 ℃,thermal shock test from room temperature up to 1 200℃ and intermittent oxidization weighting test at 1 200℃ were made.Investigation is made into the morphology, structure,and element distribution and phase distribution of the coating by SEM,EDS,and XRD.The results showed that the coating consists of tow layers.The out layer,the main body of the coating,is made of the complex phase of(Nb,Cr,Ti,Zr)Si_2, the inner layer,the intermediate diffusion transition layer,is made of the dense NbSi_2 phase and associated with minor amount of Nb_5Si_3.The addition of modified Zr and Y_2O_3 can increase the density of the coating and widen the diffusion transition layer to improve the anti-oxidation properties of the coating system with flat interface between the diffusion transition layer and the substrate/main body of the coating.The diffusion transition layer is dense and can effectively prevent the further extension of cracks and oxygen diffusion into the substrate.

<Abstrcat>Study is made of the effect of Ti(CN) content on the structure and mechanical property of cemented carbides through tests by stepwise sintering and with different Ti(CN) contents.The test results showed that the increasing of Ti(CN) content can result in thicker gradient layer,larger hardness,greater magnetic force and lower strength and density.

<Abstrcat>Description is made of the basic principle of mechanical activation and its importance for decomposition of some minerals.It is pointed out that mechanical activation can accelerate the decomposition process and also improve the leaching rate for the purpose of energy- saving and lower consumption.The paper describes the research and application in Russia.of mechanical activation for decomposition of tungsten concentrate.

<Abstrcat>Study is made of the effect of hot-rolling heating temperature and deformation rate on Mo plate structure,property and product rate.The results showed that higher hot-rolling temperature resulted in larger brittleness and smaller elogation and bending angle,as will distintlt reduce the cold-rolling processing property and directly affect the finished product property and product rate.The ～1 300 ℃ cogging temperature and >20% deformation rate is good for Mo plate rolling.

<Abstrcat>Detailed description is made of the performance,the structure,Li ion extraction-insertion mechanism,preparation method,and the doping modification of LiFePO_4.The promising future application of LiFePO_4 lithium-ion battery cathode material is also pointed out.

<Abstrcat>In the paper is reviewed the direct pyrolysis and roasting processes by rotary kiln,reverberatory furnace,multiple hearth furnace,fluidized bed,flash roaster as well as additives co-roasting process for molybdenite.Suggestion is put forward on the development of molybdenum roasting process.

<Abstrcat>In this paper is described various preparation methods of TiB_2 powder and film.It summarized the latest development of TiB_2 both at home and abroad.

<Abstrcat>In view of the deficiency of the belt drive in the agitation system of the box-type mixer-settler,the paper introduces a new agitation system controlled by SCM,as can stabilize the operating mode of the box-type mixer-settler in flexible and active way

<Abstrcat>In the paper is reviewed the development status of cemented carbide coating technology and products of in Kennametal Inc.since 1979.