Preparation And Characterization Of SbSn Intermetallic Compound

Intermetallic compounds have many outstanding properties, such as mechanicsproperties,catalytic properties and chemical stability, so there are more and moreintermetallic compounds being developed and applied as new functional materials andstructural materials. It will impel modern science and technology greatly. Now theresearch of intermetallic compound has become an important part of the new materialfield.The study on the preparation of intermetallic SbSn was described in this paper,and the analysis and characterization of SbSn was carried out with the aid of modernanalytical techniques, including XRD,SEM,TEM,DSC and AES etc. In the paper,the probability of the preparation of intermetallic SbSn using mechanical alloying(MA), the ball milling methodology, the influence of the proportion of raw materialand the addition of ball milling aids on the MA were studied , and MA mechanismalso was discussed. At the same time, the method of sintering for preparingintermetallic SbSn was studied too. The results showed that:(1) The intermetallic SbSn could be prepared by mechanical alloying with rawmaterial mass ratio of 49/51. This result has not been found in literatures.(2) Large lattice distortion occurred due to the fast diffusion induced by highdensity of lattice defects. It was found that the grain size and particle size of SbSndecreased with the milling time.(3) Under the condition of lower rotation speed(100r/min), the formation ofintermetallic SbSn during mechanical alloying was characterized by diffusion andsolid solution, but with lower ball-to-powder mass ratio(10:1), intermetallic SbSncould be prepared only partly. While under the condition of higher rotationspeed(270r/min), intermetallic SbSn was formed via the mechanically- inducedself-propagating reaction.(4) With the increase of ball milling time, the particle size of intermetallic SbSnwould increase at the beginning, then decrease. The grain size would decrease with i南京工业大学硕士学位论文 Abstractthe milling time. When rotation speed was 270r/min, ball-powder ratio was 10:1andthe ball milling time was 24 hours, the grain size of the product was about 20nm andthe particle size were in the range of 1.0~2.0μm.(5) The intermetallic SbSn with fine particle and crystallization could beprepared using suitable ball milling aids in a certain milling time.(6) When the sintering methodology was used, the crystallinity and density ofthe product would be improved with the increase of the sintering temperature. Thelonger the sintering time was, the better the crystallinity and density was, but theinfluence of sintering time was less than that of sintering temperature. The defectconcentration and amorphous state component would be increased because of thequenching.(7) With addition of suitable sintering aids, the wetting property between Sb andSn would be improved, so the sintering temperature would be reduced notably.(8) The surface of intermetallic SbSn consisted of element Sb mainly.