Li activated H 2 reduction of WO 3 is carried out in four steps. During reduction of WO 3 with 200×10 -6 lithia at 900-950℃, the reduction duration can decrease by ～20%,The activation is greatly shown in the step of WO 2 W. The coarsening of W powder size and the effect of Li addition are clearly indicated in the step of WO 2.72 -WO 2,particularly in the step of WO 2-W. The mechanism of activation and grain coarsening during reduction is discussed.

Study is made of the preparation of WCl 6 by gas solid phase reaction.The reactor type, material morphology (W powder or briquette), furnace atmosphere, product quality, chloridization reaction velocity and the rectification of WCl 6 are investigated. Using the experiment results, the chloridization reaction velocity can accelarate, and the WCl 6 powder can be obtained with low oxygen(<0.5%).

Study is made of MoSi 2 sintering technology. Results show that compact and high hardness MoSi 2 can be obtained by one hour sintering at 1 400 ℃.

Study is made of YF 20 WC 20%(65%Fe 19%Co 16%Ni) hard alloy polyester cut off tools instead of YG 20 WC 20%Co tools. Results show that the physical/ mechanical property of YF 20 is close or up to that of YG 20 .

Analysis is made of the reasons of layering in compact of drill tooth alloys due to the die structures. Measures are taken to improve the die structures. The restructured dies can reduce the compact layering, resulting in better compact quality and higher qualification rate.

The new method includes CeO 2 wet doping in tungsten blue oxide, single step reducing, acid pickling, HIP process, rolling and roughing, etc. The test and application of the resultant WCe electrodes show that the electrodes have uniformly distribution of Ce, with good arc starting and very little ignition loss.

Description is made of the reaction principle of RE Stablizer on the PVC plastics and the test on PVC sheet preparation by the said stablizer. The test results show that 0.2%～ 0.4 % addition of RE thermal stablizer can result in uniform plasticization of PVC plastics, longer thermal decomposition of the sheet, and a >50% decrease of “fish eyes” in the transparent sheet, 10～16° increase of the whiteness of the opal sheet, and 3～5° increase of the glossiness.

In this paper, on the basis of anal ysis of guide plate's damage form, according to hard alloy's properties and characteristics, we put forward that guide plate is made from hard alloy. In order to improve the fracture resistance of the plate and decrease the production cost, we develop acomposite cast technology of hard alloy. The results obtained show that the composite guide plate is safe and reliable in use, its service effect is more excellent than that of high Ni Cr steel and high Cr cast iron (steel) guide plate. The adoption of the composite guide plate will result in high precision rolled products with good surface quality, as well as increase of production rate by 2%～4%.

A colored hydrogen depleted graph was proposed to replace molecular graph so as to obtain good discrimination of the complex organic compounds by dyeing both the edges and the vertices. Furthermore,the topological index Xu based on the adjacency matrix A and distance matrix D was derived and further adapted to the multiplybonds,heteroatom containing compounds by using the related bond length to C-C bond instead of the adjacent topological distance and the valence δ i instead of the degree of vertex ν i in this paper.The index was highly correlated with the heat capacity of alkanes, unsaturated hydrocarbons, aromatics and sulfur containing compounds,etc.,and the calculated values were in good agreement with experimental data. The proposed Xu index promised to be a useful parameter in QSPR/QSAR research.

In this article, recent advance of spectrophotometric analysis of indium in metals and alloys is reviewed. Systems of developing and its conditions, the maximum absorption, molar absorptivily absorptivily, limit of detection, obeyed range to Beer's law, as well as interference are discussed