MEMS压力传感器上柔性化凸点制备方法

介绍了一种适用于MEMS压力传感器的低成本、柔性化凸点下金属层(Under Bump Metal,UBM)和凸点(Bump)的制备工艺。其中凸点下金属层分为Ni-P/Cu两层,使用化学镀的方法沉积在Al焊盘表面;凸点通过焊膏印刷回流预制于陶瓷基片上,再通过转移工艺移植到焊盘上。为了检验此套工艺制出的凸点结构是否具有足够的强度,对凸点进行了剪切破坏试验。结果表明,凸点与凸点下金属层、凸点下金属层与Al焊盘均结合牢固,破坏主要发生在焊料凸点内最薄弱的金属间化合物层(Intermetallic Compound,IMC)。     

Ni-Fe-C ALLOY EFFECT ON η PHASE FORMED DURING TIG WELDING OF WC-Co WITH 45 STEEL

Ni-Fe-C filler metal based on WC-30Co/Ni-Fe-C/45 steel is developed using TIG welding method. The weld joints are studied by means of optical microscope, SEM, EPMA, X-rays and micro hardness test etc. The results show that the weld joints of WC-30Co and 45 steel can be obtained by TIG welding using Ni-Fe-C alloys as filler metals. The harmful η phase formed in the joints is M6C, M12C type carbides. The poor carbon content of the W-Co-C system resulted from the carbon diffusion and the high ingredient Fe are the two vital factors inducing to η phase formation. It could be restricted by the addition of carbon element into Ni-Fe alloys.     

节能减摩剂及其对一些使用问题的看法

介绍了节能减摩剂出现的背景、节能减摩剂的类型和作用机理,并就一些使用问题提出了看法。     

Emei Semiconductor Material Factory

Emei Semiconductor Material Factoryincluding Emei Research Institute ofSemiconductor Material is an importantcomplex unit combining factory with insti-tute specialized in production,trial-produc-tion and scientific research of semiconductormaterials in China.It is not only a key en-terprise in China National Nonferrous Met-als Industry Corporation,but also an im-     

聚醚砜中空纤维超滤膜的双向拉伸

提出了中空纤维的“双向拉伸”这一新概念，研究了纵向拉伸、径向张力、凝固浴浓度对膜性能的影响，为设计具有合适性能的聚醚砜中空纤维膜提供参考．     

电渣重熔优质塑料模具钢A718的冶金质量和生产成本分析

研究了电渣重熔法生产的塑料模具钢A718的生产工艺和冶金质量,并对电渣重熔法生产的A718钢和电弧炉生产的A718钢的生产成本进行了对比分析。结果表明:电渣重熔法生产的A718钢具有高的纯净度和组织均匀性,选用适当的渣系和生产工艺路线,生产总成本有所下降。     

粉末冶金法生产SiCp／MR64复合材料及其超塑性的研究

本文用粉末冶金法生产SiCp/MR64复合材料,并对其超塑性进行了研究。在500℃～520℃、应变速率为8.33×10~(-3)s~(-1)获得最大延伸率为210％。SiCp数量和尺寸对超塑性有很大影响,复合材料超塑性低的原因在于变形过程中产生大量孔洞,孔洞是应变软化的主要原因。     

STRUCTURE AND PROPERTIES OF HYDRATION OF DOPED DICALCIUM SILICATES

In this paper,several dicalciumsilicates(β-C_2S)obtained from impuritieshave been studied.A study of the structureand properties of these doped dicalciumsilicates reveals that the doping with MgO ofBaSO_4 enhanced their activity and rate ofhydration,K_20 has a similar effect roughless pronounced.The lattice distortion and crystal size inβ-dicalcium silicates are measured by X-raypowder diffraction technique,the bindingenergies of 2P~3 for Ca and 2P for Si areobtained by X-ray photoelectric spectrum,thevibrations of the chemical bonds in silicateanion [SiO_4]_(4-) are examined by FT-IR andLaser Raman spectra and the heat evolutionduring hydration reaction for β-dicalciumsilicates are determined by microcalorimetry.From the results of XRD,XPS,FT-IR,Raman and micro-DSC,the relationshipbetween the microstructure and properties ofdoped dicalcium silicates and the mechanismof activation due to impurities are discussed.     

镧元素对钨钴硬质合金的影响

通过正交设计实验方法分析了合金元素对钨钴硬质合金YG6性能的影响规律。结果表明镧元素能同时提高YG6硬质合金抗弯强度11％,HRA.硬度值0.2.计算确定出制备过程的最优工艺参数为:烧结温度在1396～1410℃,镧含量在0.92％～1.04％范围内。镧元素对结构的影响表现为:细化WC晶粒。     

粉末材料的爆炸烧结

论述了爆炸烧结的方法及装置，讨论了烧结过程的机理及影响其过程的主要参数。