Production and properties of micro‐porous glas bubble zinc and aluminium composites

Micro‐porous syntactic foams were produced by means of integration of glass bubbles into aluminium and zinc matrices. Preforms of glass bubbles were pressure infiltrated with the alloys AlSi9Cu9 ans ZnAl4Cu using squeeze casting. The preforms were sintered thermically without the use of bonding agents. Using the combination of different sintering steps syntactic foams with locally different densities could be produced. The mechanical properties of the foams were tested indicating a high compression strength of the foams and a very good compression energy absorption. Furthermore, corrosion behaviour and behaviour at higher temperatures were investigated.     

基本粒子简介

介绍了基本粒子的结构和模型，指出了人类对微观世界的认识是无穷无尽的，近代天文观测已证实了宇宙往大、往小都是不可穷尽的。     

高压水射流粉碎原盐

高压水射流粉碎技术是近年发展起来的一项新型粉碎技术。文中介绍了水射流粉碎机理和新研制的后混合靶式水射流粉碎装置 ,并通过原盐粉碎实验证明 ,水射流粉碎具有效率高、工艺简单、产品粒度可调等特点 ,是一项具有良好发展前景的粉碎技术。     

Pad effects on material-removal rate in chemical-mechanical planarization

The role of a porous pad in controlling material-removal rate (MRR) during the chemical-mechanical planarization (CMP) process has been studied numerically. The numerical results are used to develop a phenomenological model that correlates the forces on each individual abrasive particle to the applied nominal pressure. The model provides a physical explanation for the experimentally observed domains of pressure-dependent MRR, where the pad deformation controls the load sharing between active-abrasive particles and direct pad-wafer contact. The predicted correlations between MRR and slurry characteristics, i.e., particle size and concentration, are in agreement with experimentally measured trends reported by Ouma¹ and Izumitani.²     

纳米氧化铝的制备及应用

介绍了高科技产品纳米氧化铝的 3大制备方法 :固相法、气相法、液相法的优缺点 ,以及纳米氧化铝的应用与发展前景     

LLDPE及其催化剂技术进展

综述了线性密度聚乙烯（LLDPE）研究的最进展情况，特别对乙烯原位聚合工艺和后过渡金属镍、钯催化剂进行了详细的叙述，对我国LLDPE的生产提出了自己的看法。     

电子封装用金属基复合材料的制备

分析了电子封装用金属基复合材料的性能特点及其对制备工艺的要求，在此基础上论述了该种材料的各种制备工艺的特点及发展现状。     

纳米Fe/C复合材料的原位合成

在石油渣油中加入二茂铁，通过热缩聚反的位合成纳米级铁粒子均匀分散于炭基体中的新型复合材料，研究了在420℃热缩聚时停时间和二茂铁添加量对Fe/C形成的影响，并用TEM和XRD观测和分析了Fe/C的形态和结构，结果表明，在基体中铁粒子的粒径为25－50nm，在一定条件下，二茂铁添加量的增加和停留时间的延长均使Fe/C产率提高，停留时间对热缩聚反应的影响遵循一级反应动力学，二茂铁的添加能显著提高反应速率常数k值。     

Mechanical and thermal properties of HVOF sprayed Ni based alloys with carbide

The objective of the present study is to develop multi-functioned coating to the components, which are made of copper with electroplated Ni and are widely used for steel making industry. In this paper, we report the mechanical and thermal properties of Ni based superalloys with carbide sprayed by high velocity oxygen fuel (HVOF), and the detailed effects of sprayed material, spraying conditions, and initial powder structure on these properties. It was found that, among commercial Ni self-fluxing alloys (without fusing treatment), coating with a carbon content of 0.58 mass% had the most preferable properties, with a good balance of the hardness, strength, and thermal shock resistance. The thermal shock resistance depended not only on the strength of the coating but also on the volume contraction when tested at high temperatures. For the several developed Ni based superalloys with carbide, Ni20Cr8Mo5Fe–WC and Ni16Cr15Mo3–WC demonstrated the prominent adhesion strength and thermal shock resistance with high Galvanic corrosion resistance through optimized spraying condition. Also, 20 mass% NiCr–Cr₃C₂ coating sprayed by using employed relatively small primary particle succeeded in achieving the multi-superior properties; high adhesion strength, high corrosion resistance and thermal shock resistance.     

Synthetic resins: XV. Chelation ion exchange properties of 2,4- dinitrophenylhydrazone of resacetophenone-formaldehyde resin

A number of copolymers were synthesised by condensing the 2,4-dinitrophenylhydrazone of resacetophenone with substituted benzoic acids/ phenols and formaldehyde in the presence of sodium hydroxide or hydrochloric acid. The decomposition temperature, solubility and viscosity of the polymers have been determined. The ion-exchange properties have been studied by using a batch equilibrium method. The distribution of a number of metal ions between an aqueous solution and the resin have been measured. A wide range of pH and variable ionic strengths have been investigated.