A novel technique for fabrication of metallic structures on polyimide by selective electroless copper plating using ion implantation

The successful use of palladium ion implantation into polyimide to seed an electroless plated film of copper on the polyimide surface is reported. Polyimide (Hitachi PIX 3400) was implanted with palladium ions to doses of 1.5 × 10¹⁵ − 1.2 × 10¹⁷ ions cm⁻² using a MEVVA ion implanter. The implanted ions acted as sites for nucleation of copper film. A copper film was then deposited on implanted polyimide using a commercial electroless plating solution. The ion energy was kept low enough to facilitate a low critical ‘seed’ threshold dose that was measured to be 3.6× 10¹⁶ Pd ions cm⁻². Test patterns were made using polyimide to study the adaptability of this technique to form thick structures. Plated films were studied with optical microscopy, Rutherford Backscattering Spectrometry (RBS) and Profilometry. The adhesion of films was qualitatively assessed by a ‘scotch tape test’. The film growth (thickness) was observed to be linear with plating time. A higher implantation dose led to greater plating rates. The adhesion was found to improve with increasing dose.     

石英砂物料气流冲击粉碎效果影响因素分析

通过对石英砂物料在不同实验条件下的粉碎结果分析，论述了流化床式超细气流粉碎机工艺参数对产品粒度的影响。     

激光法合成SiC超细粉末物理化学过程的研究——Ⅰ.实验规律及粉末特性

用50W连续波CO_2激光器为热源,诱发SiH_4和C_2H_4反应,合成SiC超细粉末。实验确定了反应腔体内压力p、气源中的C/Si原子比、喷嘴内径2r以及激光功率密度与粉末特性之间的关系,并对合成的产物进行物理、化学表征。     

高强度烧结钢

为开拓粉末冶金材料新的应用领域，近年来对高强度烧结钢进行了大量的研究与开发。本文简要介绍Ｈｏｇａｎａｓ公司开发的一些高强粉末冶金材料及对一些高强度烧结材料尺寸变化的控制。     

超细铁粉和氧化铁颗粒的研究

用透射电镜和图像分析仪等研究了超细铁粉和γ-Fe_2O_3粉末的结构、形貌、粒子的平均尺寸以及粒度分布。研究结果表明,多数超细铁粉粒子近似呈球形,并且,铁粉粒子由两相组成,粒子的核心部分是金屑a-Fe,表面的包裹层为氧化物层,它由Fe_3O_4和7-Fe_O_3的混合物组成。氧化层的平均厚度大约占整个粒子直径的20％左右。羰基铁粉粒子(含氧化层)的平均直径为16nm。直径在4～24nm范围的粒子数占总粒子数的91％,而7-Fe_2O_3粉末既有雪茄状粒子,也有小球状粒子。分析表明,球状粒子的平均直径为113nm,雪茄状粒子的平均直径(按<长 宽>/2计算)为148nm。由于超细铁粉粒子很细,且有磁性,制备电镜试样时分散比较困难。本文比较了几种分散方法后,使用了一种较好的分散方法——超声喷管分散法。     

TiO_2粉体性能对PTC热敏电阻性能的影响

ＴｉＯ_２的纯度、粒度及粒形对ＢａＴｉＯ_３系ＰＴＣＲ的性能影响很大，对所用ＴｉＯ_２加以选择非常重要，国产和日本产ＴｉＯ_２原料在粉体性能上存在差异。     

Flexible and light weight copper indium diselenide solar cells on polyimide substrates

Thin film flexible CuInSe₂ (CIS) solar cells have been fabricated for the first time on light-weight polymeric substrates. Evaporated Cu---In alloy precursors were selenized in H₂Se atmosphere at around 400°C to grow the CIS absorber layers. Low temperature techniques which are compatible with the polymeric substrates were used to deposit the window layers of CdS and ZnO. The demonstrated active area conversion efficiency of 9.3% makes this light-weight device very attractive for many terrestrial and space power generation applications where high specific power and mechanical flexibility are needed.     

相转移法制备高纯超细TiO2技术研究

报道了用相转移法制备高纯超细ＴｉＯ２的新技术；探讨了Ｔｉ（Ⅳ）从有机相转移到水相发生水解反应的机理 ；通过ＴＧ－ＤＴＡ分析以及ＸＲＤ物相分析对水解产物的组成、热分解机理，晶型转变规律进行了研究，建立了水解产物焙烧的最佳温度。     

固体推进剂中有关粒度分布的数学处理

介绍了固体推进剂中有关颗粒度分布的数学处理方法，用几种数据统计分析的理论分布函数－正态分布，对数－正态分布，Ｋ分布，并以铝粉和含铝推进剂燃烧残渣的颗粒分布为例进行了分析，根据Ｃｕｌｉｃｋ微粒阻尼的理论计算模型，讨论了粒度分析在阻尼效应计算中的应用。     

MECHANISM OF BREAK─UP OF LIQUID DROPLETS GENERATED BY ELECTROHYDRODYNAMIC TECHNIQUE

分析了电流体动力学技术制备纳米粉的液滴破碎机理，结果表明：外加电压、电场强度、液体金属性质直接影响金属液滴的破碎程度。