Description is made of the development of coating technology for cutting tools in Sandvik Coromant Company.It has summarized the development of cemented carbide coating products of the company since 1979.

Based on the review of the recent-year output and sales volume of the Ta main products and the company's financial statement of Australia Sons of Gwalia Ltd.the paper focused on the general description of the background and production process and expansion of the its subsidiaries-Greenbushes Ltd and Wodgina,the world largest and second largest Ta mines.

In the environment of strong base,ultrafine Ce-Zr-O powders were prepared.At the same time,the properties of the ultrafine powders were studied with aids of XRD,TG,laser particle sizer,specific surface measuring and testing instruments etc.The experiment showed that Zr-Ce-O particle size tends to become bigger with the increase of the zirconium content.Ethanol absolute is a good cleaning compound,the efficiency under the dry ball milling is better than that under the wet method milling.As a kind of reaction raw material,nitric salt is more suitable than chloride salt under the strong base.

This article introduces the concept of Ga recovery technology from In raffinate by two-stage solvent extraction and electrowinning with hydroximic acid YW-100 with high carbon chain+kerosene+isooctanol and N503+kerosene isooctanol The principle process flowsheet for Ga recovery is presented.

Study is made of the process of violet tungstic oxide preparation and the influnce of APT raw material on the production of violet tungstic oxide are studied.Phase compositions of the products are analyzed by X-ray diffraction;morphology of powder is studied by SEM;microproperties of powder is studied by TEM.Properties of fine tungsten powder and fine tungsten carbide powder from violet tungstic oxide are studied.The result shows that the process of violet tungstic oxide preparation is advanced and reasonable,tungsten powder and tungsten carbide powder from violet tungstic oxide is fine and uniform with good dispersion property and good raw material for the high-performence cemented carbide.

Precipitation reaction of NH4HCO3 with RECl3 is determined through study of pH variations during precipitation and the analysis of composition of the precipitants.Discussionis are made on the effect of the technological conditions on the product purity.

Study is made of the influence of RE elements on tungsten electrode in order to improve the tungsten electrode thermionic-emissivity to ensure successful plastic working of the material.The results showed that with Y2O3=(La2O3+CeO2)=3∶2,the tungsten electrode will have best combination property.

The welding joints between YG30 and S45C by using Ni-Fe-C alloys as weld metal were obtained by TIG welding.The welding joints were studied by means of optical microscope, SEM, EPMA, X-rays, micro hardness etc. The results showed that the welding joints between YG30 and S45C by TIG welding, can be obtained by using Ni-Fe-C alloys as weld metal,The harmful η phase can be restricted by the addition of C element into Ni-Fe alloys.So the inadequate carbide of the W-Co-C system induced by the C diffusion and the high ingredient Fe are the two vital factors to η phase formation, and η phase was M6C, M12C type carbides

The MoSi2 dispersion-strengthened copper alloy (DSC)has been preparaed by high-performance ball milling and cold pressing and sintering.The paper analyzed the effect of sintering temperature,ball milling method and compact density on the density of MoSi2 disperslion-strengthened copper alloy.The results show that the largest effect is sintering temperature,the optimal sintering temperature of Mosi2 DSC was 950 ℃;the effect of ball milling metlhod comes the second,but wet-way ball milling is better than dry-way ball milling.There is no distinct effect of compact density on the sintering density.

Enriched Ti material with TiO2≥74% is prepared by crushing,grinding,magnetic separation after preheated briquette direct reduction in the rotary kiln based on microfine Ti concentrate from Pangzhihua Mine as raw material and coal from Yunnan Luhe Mine as reductant with the addition of new binder and additive.