铁铬铝材料高频磁导率的测量

通过理论分析和试验研究,得到铁铬铝合金材料在S波段的高频磁导率,为此种吸波材料的设计提供理论依据。     

反应液滴加次序对液相还原法制备纳米Co-Cu-B合金的影响研究

采用液相还原法,以KBH4作还原剂,PVP为分散剂,在二价钴、铜盐的纯水溶液中采用两种不同的反应液滴加顺序制备出纳米Co-Cu-B系合金粉体材料。运用XRD、EDS、AES、SEM和VSM等分析方法对制备的产物进行物相、成分、结构形貌、磁学性能的检测分析。检测分析结果表明:反滴工艺不易保证还原反应的充分进行,并且产物中存在氧化物夹杂,影响产物的磁学性能。因此,为了获得具有良好性能的合金粉末,反应物合适的滴加顺序应该是:将还原剂溶液缓慢地滴加至金属盐溶液中。     

Effect of aluminium and silicon on high temperature oxidation resistance of Fe-Cr-Ni heat resistant steel

Fe-Cr-Ni heat resistant steels with different contents of Al and Si were cast in intermediate frequency induction furnace with non-oxidation method. With oxidation weight gain method, the oxidation resistance of test alloys was examined at 1 200℃ for 500 h. The effects of Al and Si on oxidation resistance were studied through analyses of X-ray diffraction (XRD) and scanning electron microscope (SEM). It is shown that the composition of oxide scales is a decisive factor for the oxidation resistance of heat resistant steels. The compounded scale composed of Cr2O3, ar-Al2O3, SiO2 and Fe(Ni)Cr2O4, with flat and compact structure, fine and even grains, exhibits complete oxidation resistance at 1 200℃ Its oxidation weight gain rate is only 0.081 g/(m2·h). By the criterion of standard Gibbs formation free energy, a model of nucleation and growth of the compounded scale was established. The formation of the compounded scale was the result of the competition of being oxidated and reduction among Al, Si, and the matrix metal elements of Fe, Cr and Ni. The protection of the compounded scale was analyzed from the perspectives of electrical conductivity and strength properties.     

厦门钨业:电池材料将成为新增长点

主营业务分析:一、锂电池材料业务前景广阔:08年公司锂电池材料产量在500-600吨,按吨价格25万元计算,公司锂电池材料业务实现销售收入1-1.5亿,占公司销售收入约3%。公司预期09年     

用激光表面处理改善碳素钢耐蚀性的研究

本文研究用激光表面处理使碳素钢表面合金化,从而提高普通碳素钢的耐蚀性,且研究表明随着焊缝中铬含量的增加,耐蚀性提高。研究还表明用较高的扫描速度和较大的激光功率可获得稳定的焊逢形状。     

非晶态Fe-Cr合金镀层的电沉积机理探讨

本文研究了甘氨酸的加入对单金属镀液、Fe-Cr合金镀液的阴极极化曲线的影响,初步探讨了甘氨酸在三价铬电镀Fe-Cr合金镀层的镀液中的作用。加入甘氨酸后,可得到优良的镀层,而不含甘氨酸时,镀层中夹杂铬的化合物,镀层质量恶劣。在此镀液中,甘氨酸的作用可能为与Fe（Ⅱ）络合,使其析出电位负移,达到铁铬共沉积的目的。