The phase composition and microstructures of the combustion-synthesized products with ratios of W/(Ti+W) of 0.4 and 0.54 in Ti-W-C system were studied.The kinetic high-temperature reaction process in the combustion front was analyzed through quenching of combustion front.The study results showed that there existed two reaction models.The first is defined as melt-solution-precipitation mechanism;Ti powder in the combustion front is molten at high combustion temperature,W and C are dissolved into liquid Ti,Ti-W-C melt is formed and (Ti,W)C is precipitated from the Ti-W-C melt.The second is described as diffusion-solution-in-solid state;when the combustion temperature is not high enough to melt Ti powder in the combustion front,C diffuses rapidly along cracks formed during combustion process and reacts with Ti to form TiC,meanwhile W 2C is formed and transformed to WC through C diffusion,then WC is dissolved into TiC to form(Ti,W)C.

A new process is developed for gallium extraction from a lead-zinc smelter slag H 2SO 4 leach solution.The results showed Ga recovery can reach 98% by elimination of iron as jarosite;precipitation of gallium for gallium enrichment;extraction of gallium.

Two new types of YJ2.1 and YJ1.1 cemented carbides for mining were developed from WC powder at 13.5 μm particle size and high-purity Co powder ground by rod mill with special technology of disintegration and sintering.The product good performance is proven by site demonstration,its wearability and properties are evidently better than YJ1,YJ2.

Investigation is made on the production process of Low O 2 Ta rod from high-O 2 Ta powder,The results show that the Low-O 2 quality Ta rod can be obtained by carbon added pre-sintering and reduction of high-O 2 Ta Powder.The process is simple,energy-saving with less loss and distinct economic benefits.

Preparation process and commercial operation of high-purity dysprosium metal is studied.The results show that it is applicable to adopt the process flowsheet of HF gas fluoridization-preparation of intermediate alloy-vacuum distillation-low temperature-high temperature vaccum distillation for commercial production of high-purity Dy.

Study has been made of the influence of raw material,reduction temperature,H 2 flowrate,boat speed and boat charging capacity on the cobalt powder particle size.The paper has summarized the control of cobalt powder particle size.

In this article,the latest exploratory development of Azo reagents in spectrophotometrical analysis of rare metal alloys is reviewed.The paper also described the reaction conditions limit and range of detection,or sensitivity as well as interference of the corresponding spectrophotometrical analysis.

Summary is made on the several years of product development and design experiences.Analysis and comparison is made of the Mo disk process with emphasis on overall discussion regarding the process design and quality control of Mo wafers production by Mo plate punching and machining.

Brief description is made of the application and properties of various gilding materials.Emphasizes are put on the basic information and achievement in the deveopment of TiN-based gilding materials,the synthesis of new gilding material-TiO powder and latest development of TiO-based PM gilding materials.

With review of the role of Ti-containing catalysts in the modern catalytical industry and its impetus to the development of modern industry,the paper briefly describes the latest development of Ti- containing catalysts.The paper also introduces the related new achievements made by Chinese catalyst researchers and related literatures and references.