According to the proton chemical displacement in the NMR spectrum,a method of calculating the Pauling group electronegativity was put forword. The relationship formula between the electronegativity of group R and the proton chemical displacement in CH 3-R has been given: x=10.65-8.555 2-(1.25δ) 2

A new sulfidizing agent instead of Na 2S and NaHS. has been used to prepare thiomolybdate from sodium tungstate solution. The process parameters in sulfidizing process has been investigated. When the concentration of sodium hydroxide in solution is 8-16 g/L, the concentration of free S 2- is 4 g/L, and the pH is less than 9, the extraction rate of molybdenum is more than 95%.

Influences of various parameters, such as average particle size, green density, sintering temperature, on the specific electric capacity of tantalum powder with high specific capacity were studied. The regression equation between the capacity and parameters was obtained. The temperature dependent characteristics of tantalum powder, furthermore, were investigated,by a comparison of some domestic powders with PL 22. The results show that the loss of the specific capacity during sintering increases with decreasing Ta powder particle size. Each paritcle size has an optimum sintering temperature for lowest loss of the capacity. The poor temperature characteristics of domestic Ta powder was due to non homogeneous distribution of the powder particles and their complicated shape.

Based on the Comparison between the continuous annealing of Ta wire with oxide film and the original technology, and on the analysis of the relation between the continuous annealing , oxygenated parameters ,and the wire flatness, it is proven that the continuous annealing of wire with oxide film has an advantage over the original stacked annealing, as is an important technical breakthrough in the Ta wire production.

The relationship between brittleness resistance and content of Fe Si B amorphous alloy have been determined experimentally. By analyzing the cause of brittleness in detail, a conclusion is formed that the brittleness of FeSiB amorphous all is influenced by Si and B content. The brittleness resistance will be improved greatly by properly control of B and Si content.

High temperature sintering process of Mo 3% Re alloy by dry hydrogen and final vertical system was investigated. It was shown that the Mo 3% Re alloy by dry hydrogen sintering features finer grain sizes, higher tensile strength, elongation and microhardness values than the alloy by final vertical sintering.

DGJW40 is a new kind of steel bonded carbide made by a new technology. By studying and comparing the microstructure of this alloy before and after forging, the results show that the microstructure and mechanical property of this alloy has been effectively improved after forging.

The supported catalyst Ln 2O 3/Al 2O 3 prepared by coprecipitation calcination has remarkable effect on the catalytic synthesis of DOM to larger specific surface and high dispersion.

Detailed analysis is made of the granulating mechanism of sintering material and drum liners. Based on comparison of lining materials for engineering purpose and its application, the paper indicated that during production, the ideal liner will adsorb a thin layer of mixed material at its surface, which will not be bonded and thickened gradually, resulting in better mixing and granulation and longer service life. The selection of proper liner is important for higher filling rate of the drum, and better permeability of the mixed material as well as larger output of the sintered ore.

Lattice constants in tungsten and cobalt were precisely measured by X ray diffraction. The results of measurement are that the lattice constant S in tugnsten is a=0.316468nm, and in cobalt is a=0.354410nm. The crystal structure of fcc is dominant in cobalt powder, and hcp only a few.