磁场对石油污水管线钢的腐蚀行为研究

采用第3代永磁材料NdFeB(钕铁硼),研究了在施加永磁场条件下,模拟油田污水介质对20号钢的腐蚀过程,采用增重法、X射线衍射以及电化学方法对磁场作用下石油污水管线钢的腐蚀行为进行分析和评价。研究结果表明,磁场对Fe3O4的形成、自腐蚀电位正移幅度有促进作用,磁场对腐蚀产物的增重率影响较大,但它们与磁感应强度之间存在着极值关系。     

浇筑式沥青混凝土心墙型式改进的建议

本文根据浇筑式沥青混凝土主、副心墙材料的性能，分折了沥青混凝土心墙施工或运行中破坏的原因，建议用编织一无纺复合布取代预制块，以避免主、副心墙材料变形性能相差悬残对心墙运行的不利影响，从而发挥浇筑式沥青混凝土心墙的优越性。     

注射成形粘结NdFeB磁体:工艺·性能·应用

综合介绍了几种适于注射成形粘结NdFeB磁体的磁粉制备方法及特点；讨论了粘结剂、改性剂及磁场取向对注射成形NdFeB磁体最终磁性能的影响及其应用市场。在此基础上，指出了今后开展研究工作的方向。     

Effects of a Nd—Fe—B magnetic filler on the crystallization of poly(phenylene sulfide)

The crystallization of poly(phenylene sulfide) (PPS) in a polymer–magnetic Nd—Fe—B powder suspension was studied. Isothermal crystallization behavior was analyzed by way of differential scanning calorimetry, and the kinetics were described via the Avrami equation. The Avrami parameters and the crystallization times were strongly affected by both the particle size and the presence of a coupling agent coated on the filler particles. The small Nd—Fe—B particles exhibited long induction and half‐times, whereas the large particles tended to have short crystallization times. Particles ranging from 38 to 150 μ appeared to have similar crystallization times and to have no significant change in the value of Avrami index with melt crystallization temperature. As a result of these analyses, the dynamic mechanical properties were determined to correlate the fundamental polymer crystallization characteristics and the physical properties of the PPS binder. The enhancement of the wetting of the filler to the binder was promoted through the coupling agent, as confirmed by dynamic mechanical testing performed on the samples. The storage modulus typically decreased because of the presence of the uncoated small particles. Conversely, the loss modulus was enhanced because of the presence of the coated small particles in the PPS binder. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1091–1102, 2002     

采用一次模压成形工艺生产高性能烧结NdFeB磁环

介绍了采用一次模压成形工艺批量生产高性能烧结钕铁硼磁环的新工艺 ,指出了目前该工艺仍存在的一些问题 ,同时概述了该工艺的应用前景     

X-Ray Measurement of Residual Stress in Plastic Bonded Explosives

The X-ray diffractive technology was adopted for tentative study of plastic bonded explosive. The datum of some new diffractive peaks in standard PDF cards were added. The effects of strain to interplanar distance and crystal size of the explosive were studied. The results show that grain size of plastic bonded explosive is decreasing with the increasing of the pressure, and the residual stress of the explosive is draw stress.     

应用10mm薄板铸锭制备的NdFeB烧结磁体

NdFeB薄板铸锭具有晶粒细，富钕相分布均匀及在稀土含量较低时可以防止α－Fe相出现的特点，是一种适合制备高性能烧磁体的合金铸锭，本文介绍了一种用10mm薄板铸锭和球磨制粉方法制备烧结磁体的工艺，在设备要求较低的情况下制备得到了Br=1.37T,(BH)max=320kJ/m^3(40MGOe)的烧结磁体，同时比较了使用常规铸锭和常规工艺的结果，强调了氢爆法在该工艺中的重要作用，最后对该工艺的改进方向和10mm铸锭的应用前景进行了阐述。     

石英砂在菱苦土磨具中的作用机理

本文利用物质结构与化学键的有关理论对石英砂的菱苦土磨具中的作用机理进行分析，并以实验对分析结果进行验证。结果表明：金刚砂晶体中Si-C共价键的离子性百分数仅为9％，石英晶体中Si-O共价键的离子性百分数为47％，因此，石英与主要以离子键结合的菱苦土结合剂之间有较强的静电作用力，石英与菱苦土的结合力强于金刚砂，可提高菱苦土磨具的耐磨性。     

太阳电池板结构应力-应变状态分析

多层胶接是太阳电池板的结构特点,由于不同材料的弹性模量、热膨胀系数和泊松比不同,在温度场 作用下会产生热应力应变,在多次热交变过程中热应力．应变累积最后导致结构层间剥离,因此研究温度场作用 下太阳电池板结构应力应变状态具有非常重要的实际意义。本文推导了模拟太阳电池板结构应力-应变状态的一 维模型,该模型同样适用于分析多层胶接结构应力应变状态。     

Factors Affecting the Squareness of Hysteresis Loops of Sintered NdFeB Magnets

Investigation into the magnets with different squareness of hysteresis loop (SHL) reveals that the microstructure of sintered NdFeB magnets has great effects on the SHL of the magnets. The abnormal grain growth deteriorates the SHL seriously. The shape of the grain and the grain boundary affect the intensity of demagnetization field, and consequently on the SHL. The added elements have effects on the phase structures and distributions in the magnets, which influences the uniform of demagnetization field.