CaTiO3：Pr3＋ was prepared by high-temperature solid phase carried out with H3BO3. Its emission spectrum, glow brightness and fluences of H3BO3 content on the emission intensity and luminescent discussed. The results show that the prepared CaTiO3 ： Pr3＋ is of the method, and doping afterglow time were modification was studied. The inperformance of CaTiO3 ： Pr3＋ were optimal afterglow performance when H3BO3 is at 15% molar fraction

Al-Ti-B-RE refiner was prepared by fusion casting. The influences of remelting temperature and times on the morphology and distribution of the second-phase particles and on the refinement result of Al- Ti-B-RE refiner were studied. The results show that the dispersive second-phase particles are aggregated after remelting,and gradually transform into massive, clubbed and acicular-flaky phase from fine particu- lates with the increase of remelting temperature. The refiner is hardly affected with remelting times, and still with refinement ability after remelted for many times.

The corrosive effects of the additives in WEDM working liquid on cemented carbide were studied by SEM and EDX. Some additives were selected as the cobalt leaching inhibitors. The results show that tri- ethanolamine in the working liquid can promote the leaching of cobalt from cemented carbide, while trietha- nolamine oleate, borax and benzotriazole can obviously inhibit cobalt from leaching.

The thermal fatigue tests of Co-P alloy coating prepared by electrolytic plating were performed on a self-restraint thermal fatigue testing machine. The initiation and propagation mode of the thermal fatigue cracks, which were on the surface of the coating and caused by thermal stress, and their morphology were investigated by optieal microscopes and scanning electron microscopes. The results show that there is plas- tic deformation near V-notch after 200 thermal cycles, and the thermal fatigue cracks initiate at the bottom of V-notch and propagate in the thermocycling direction. The initiation and propagation mechanism of the cracks are emphatically analyzed.

SiC whiskers were synthesized with SiO2 powders, graphite and NaaAlF6 as the raw materials. The products were analyzed by XRD and SEM. The results show that the products synthesized with Si/AI molar ratio of 4 ： 1 and at 1 500 ℃ is of the best quality. The whisker synthesis mechanism is discussed. It is presumed that the whisker growth follows VS mechanism and Na3AlF6 doesn＇t react during the actual synthesis process. About 0. 005 supersaturation degree of the gas reactants is calculated,as is good for the growth of whiskers.

In view of the low vanadium and carbon content of Huangshan carbonaceous shale in south An- hui, a new process of flotation decarburization-underlying vanadium ore roasting-acid leaching-vanadium extraction is proposed,where the carbon refers to the washed coal. Production practice shows that the total vanadium recovery of the process can be up to 75.10% ,and the quality of the obtained V2O5 product meet the GB 3283--87 metallurgy 98 level. This process can not only improve the vanadium recovery but also achieve the carbon comprehensive utilization of carbonaceous shale.

The G206 buttons of high-pressure drilling rigs are fragile when drilling hard rock. In view of the above problem,a G206H button is developed by adjusting the WC formula in raw material and improving the production process. The new button is of excellent wearability and bend strength, and no fragments were found in the field rock drilling test.

The emission spectrometry of trace antimony in tungsten concentrate was studied. The graphite powders was employed as the buffering agent containing the mixture carrier of sodium fluoride, sodium car- bonate and gallium oxide. The standard working curve of antimony is drawn based on three-standard-sam- ple method. The Sb detection limit of this spectrometry is 0. 003 % and its determination results are very close to those obtained by chemical method.

The chromogenic reaction between tribromoarsenazo and barium was studied as well as the influ- ences of coexistent ions on the reaction. The results show that barium reacts with the chromogenic reagent in 0.3 mol/L H3PO4 solution to form a stable purple complex,which exhibits an absorption maximum at 618 nm with an apparent molar absorptivity of 3.90 × 104 L/（mol cm）. Beer＇s law is obeyed with the barium content of 0-40 μg/25 mL. The chromogenic reaction is of high sensitivity and the speetrophotometry can be used to determine the barium content of Si-Ca-Ba alloy. The determined results are in agreement with the certified values, and the relative standard deviation （RSD） is less than 2%.

The latest development of sintered NdFeB permanent magnetic material is reviewed in respective of its formula, additive element and preparation technology. Its application in some industrial fields is in- troduced. Based on contrastive analysis, the research and application trend of sintered NdFeB in our country is pointed out.