Crystalline hydrated yttrium carbonate and hydrated crystalline ammonium and yttrium carbonate compound are obtained by precipitation of yttrium sulphate solutions with different amount of ammonium bicarbonate under given conditions.The process and mechanism of conversion of amorphous precipitate into crystalline precipitate during precipitation and aging were studied by element anaysis,X-ray powder diffractometry,infra-red spectrometry,thermal analysis and scanning electron microscope.

Dense and adhesive hydroxyapatite bioceramic film was electro-chemically deposited on titanium substrate.The effect of H 2O 2 addition was studied with a solution containing 0.01mol/dm 3 calcium ion,0.006mol/dm 3 phosphate ion and at 55℃.All deposits were hydroxyapatite in this study,independent of H 2O 2 addition.But it is found that the cathodic current starts at ca.-0.2V with H 2O 2 addition while the corresponding potential is -1.4 V without H 2O 2 addition.The vigorous evolution of H 2 gas can also be eliminated after using H 2O 2.

Study is made on the use of Cu-based and Fe-Cr-based alloy as the binding phase of TiO-based Cermet gild material.The results showed that pure Cu and Fe-Cr alloy has lower wettability on Tio,as is not suitable for TiO binding phase.The addition of small amount of Mo,C in Cu can distinctly improve the wettability,while the addition of proper amount of Al,Ni and Si into Cu-Mo-C means alloy color similar to gold and good wearability as well as very high inferface bond strength with TiO,as are suitable as binding phase of TiO ceramic.The wettability of Fe-Cr alloy can be remarkably improved and the reaction at Fe-Tio interface can be controlled to form very high strength at the interface with TiO by addition of surface active substance A,Fe-Cr can be used as binding phaes of TiO Ceramic.

One newternary compound of Eu 3+ -AAOM-TTA(AAOM:acrylamide(70%)/acrylic acid(30%)oligomer,M n=10000;TTA:2-thenoyltrifluoroacetone)was synthesized and its fluorescent spectrum was measured.The luminescent intensity is greater than that of NaEu(TTA) 4,(a strong light emitter),and twenty times bigger than that of E 3+ -AAOM binary compound.The influence of synthetic conditions on luminescent intensity was investigated.The composite is a potential good luminescent material.

The study is made on technical conditions for measuring of HR hardness under different status of some steel-bonded WC widely used at home.The main factors influencing the accuracy of measured hardness of steel-bondee WC are presented.

Study is made of the variation mechanism of Nb 2O 5,main physical properties,ie grain shape,crystalline structure,average particle size,specific surface area and bulk density under calcination temperature.The law of the variation with the temperature variation is found out.Investigation is made on the reasons for the variation.Analysis is made of the relationship between Nb 2O 5 average particle size,specific surface area and bulk density so that the average particle size and specific surface area can be quickly calculated out by measuring the bulk density.

Description is made of the heat-shrinkable compounds and materials,which have arisen interests in the field of science and technology in the last 5 years.These materials are classified in three structural models:SC 2(WO 4) 3,AM 2O 7and cubic ZrW 2O 8 polymorphs.The cubic ZrW 2O 8 was introduced emphatically because it is an isotopic heat-shrinkable compound with as wide as one thousand temperature range.The improvement on cubic ZrW 2O 8 was discussed,too.

Study is made of the process for the production of zirconium sulfate from zircon.The main Steps are as follows:alkali fusion,water washing and conversion,primary and secondary crystallization;centrifugal packing.This unique process has solved the problems in Zr and Na separation,Zr and Fe separation and crystal morphology etc.The product quality can meet the requirements of the customers both at home and abroad.

This paper reviewed the development of the synthesis techniques of nanocrystalline WC-Co composite powders,summarized the sintering characteristics of nanocrystalline WC-Co cemented carbide.The present reaesach status is analyzed,the problems and research tendency are also discussed in the paper.

The development of lithium ion battery anode materials was described.The properties and preparation methods of lithium cobalt oxide and lithium nickel oxide were introduced in detail.