Formation of composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system

The formation of aluminum matrix composites fabricated by exothermic dispersion reaction in A1-TiO2-B2O3 system was investigated. The thermal analysis results show that the reactions are spontaneous and exothermic. The Gibbs free energy of α-Al2O3 is the lowest among all the combustion products, followed by TiB2 and Al3Ti. It is noted that when the B2O3/TiO2 mole ratio is below 1, the reaction products are composed of particle-like α-Al2O3, TiB2 and rod-like Al3Ti. The α-Al2O3 crystallites, resulting from the reaction between A1 and TiO2 or B2O3, are segregated at the grain boundaries due to a lower wettability with the matrix. SEM micrographs show that rod-like Al3Ti phase distributes uniformly in the matrix. When the BEO3/TiO2 mole ratio is around 1, the Al3Ti phase almost disappears in the composites, and the distribution of α-Al2O3 particulates is improved evidently.     

2004年北京国际铁合金洽谈会暨展览会总结

由中国金属学会和中国铁合金工业协会联合举办的“2 0 0 4年北京国际铁合金交流洽谈会暨展览会”于 2 0 0 4年 9月 2 0～ 2 2日在北京国际会议中心举行。有来自 2 4个国家和地区约 180余家单位的 4 0 0多位代表参加了本次活动。这些代表中既有国内外知名的铁合金生产者、经营者     

“国际钛产业发展高峰论坛”举行

6月28日～29日，“国际钛产业发展高峰论坛”在江苏省东海县举行，此次论坛由香港新时代国际实业有限公司、东海县人民政府、东海新时代应用材料有限公司主办。国内外200多位钛产业相关人士出席了会议，本次论坛深入探讨了中国钛产业的现状及发展趋势，并探索如何深入挖掘钛产业的潜在市场。会议讨论了国内的钛产业发展格局和主要问题，     

钛的应用及前景展望

从传统应用及新兴应用两方面对钛的应用进行了综述,并对钛的应用前景进行了展望。     

Spin Dependent Hopping in Ti Doped La0.67 Ca0.33 MnO3

A systematic investigation of the magnetic and transport properties of Ti doped La0.67Ca0.33MnO3 was reported. The Ti substitution for Mn ions results in a reduction in ferromagnetism and conductivity. The metal-insulator transition temperature is close to Curie temperature which decreases from 274 to 82 K as x increases from 0 to 0.17. The most important effect of Ti doping is to introduce spin clusters in the samples due to the distortion of local lattice and the inhomogeneous magnetic structure induced primarily by the random distribution of Mn ions. A maximum magnetoresistance ratio as large as 90% in 1 T at 122 K was obtained for the sample with x =0. 055, which is four times larger than that obtained for LCMO sample at 272 K. There is a remarkable field-history dependent MR in the cooling process for the doped samples while such phenomenon disappears in the warming run. The resistivity follows well the variable range hopping behavior in paramagnetic state. Both the size effect and spin dependent hopping of carriers between the spin clusters should be considered in this system.     

钛精矿回转窑直接还原过程结圈可能性的探讨

通过煤种，入窑球冷态强度和还原过程强度，以及钛精矿与煤灰混合物的软化温度等分析探讨了钛精矿预热球团回转窑直接还原产生结圈的可能性，获得了可以避免结圈的结论。     

钛制设备在焦化行业中的应用

介绍焦化行业钛设备的应用,剖析了分块式钛泡罩塔盘的结构特点,并对其经济性作了分析。     

钛制硬盘的特性

谐振性能和阻尼性能可调节。随TiN层的不同厚度调节盘片的谐振峰值，适应不同的转速，降低磁道记录失真，提高硬盘性能。