A STUDY OF FATIGUE WEAR PERFOR MANCE OF TiN COATED SURFACE BY PHYSICAL VAPOR DEPOSITION

１．ＩｎｔｒｏｄｕｃｔｉｏｎＲｏｌｌｉｎｇｃｏｎｔａｃｔｆａｔｉｇｕｅｗｅａｒｉｓａｐｈｅｎｏｍｅｎｏｎｏｆｇｒｅａｔｐｒａｃｔｉｃａｌｓｉｇｎｉｆｉｃａｎｃｅｔｏｍａｎｙｅｎｇｉｎｅｅｒｉｎｇａｐｐｌｉｃａｔｉｏｎｓｉｎｖｏｌｖｉｎｇｃｏｎｃｅｎｔｒａｔｅｄｃｏｎｔａｃｔｓ．Ｉｎｓｕｃｈｓｉｔｕａｔｉｏｎｓ,ａｆｅａｓｉｂｌｅｓｏｌｕｔｉｏｎｉｓｓｕｒｆａｃｅｔｒｅａｔｍｅｎｔｏｎｏｎｅｏｒｂｏｔｈｏｆｒｏｌｌｉｎｇｃｏｍｐｏｎｅｎｔｓｔｏｉｍｐｒｏｖｅｉｔｓｆａｔｉｇｕｅｗｅａｒｐｅｒｆ…     

合成氨碳化尾气中氨的回收

对于小氮肥,多讨论再生气,驰放气,贮罐所回收、利用,本文主要介绍碳化尾气中氨的回收、利用和工艺改造。     

Crystallization studies on phase-change optical recording media by use of a two-dimensional periodic mark array

We present the results of crystallization studies in thin-film samples of amorphous and crystalline Ge(x)Sb(y)Te(z). The experiments, conducted at moderately elevated temperatures, are based on measurements of the first-order diffraction efficiency from a two-dimensional periodic array of recorded marks. When the samples are slowly heated above room temperature, changes in the efficiencies of various diffracted orders give information about the on-going crystallization process within the sample. Two different compositions of the GeSbTe alloy are used in these experiments. Measurements on Ge(2)Sb(2.3)Te(5) films show crystallization dominated by nucleation. For the Sb-rich eutectic composition Ge-(SbTe), crystallization is found to be dominated by growth from crystalline boundaries. We also show that crystalline marks written by relatively high-power laser pulses are different in their optical properties from the regions crystallized by slow heating of the sample to moderate temperatures.     

脱吸气冷激式SO2转化器的最优化条件式

本文主要以脱吸气冷激，四段转化为例，推导出ＳＯ２转化器的最优化条件式。     

Optical switching properties of Pd--Ni thin-film top-capped switchable mirrors

Switchable mirrors based on magnesium--nickel alloy thin films capped with catalytic Pd--Ni alloy thin films were prepared by a DC magnetron sputtering method. Their composition, structure and surface morphology were studied by XPS, XRD and AFM. Herein, the optical switching properties and durability of the switchable mirrors were investigated by varying the Ni content in the Pd--Ni alloys. Comparing pure Pd catalyst with Pd--Ni top-capped switchable mirrors, the latter show better hydrogenation and dehydrogenation kinetics, and the speed of hydrogen desorption is obviously improved with increasing Ni content in the Pd--Ni alloy. The Pd--Ni capped switchable mirrors also have better optical switching durability. The catalytic Pd layer with the addition of Ni does not influence the transmittance (hydride state) and reflectance (metallic state) of the switchable mirrors. In addition, replacing Pd with Pd--Ni alloy decreases the cost of the switchable mirrors: employing nickel in the alloy Pd_89.2Ni_10.8 can save about 11% use of Pd. Therefore, the Pd--Ni alloy can provide a cheaper catalytic thin film, and it is expected to have applications in energy-saving windows, hydrogen sensors and hydrogen storage materials.     

Effect of Cyclic Loading on Cracking Behaviour of X-70 Pipeline Steel in Near-Neutral pH Solutions

The cracking behaviour of X-70 pipeline steel in near-neutral pH solutions was studied under different modes of cyclic loading. The crack propagation process of X-70 pipeline steel under low frequency cyclic loading condition was controlled mainly by stress corrosion cracking (SCC) mechanism. Under mixed-mode cyclic loading, both higher tensile stress and shear stress made cracks easier to propagate. Applied cathodic potentials and high content of carbon dioxide in solutions also promoted the propagation of cracks. The propagation directions of cracks were different under different cyclic loading conditions. Under mode I (pure tensile stress) cyclic loading condition, cracks were straight and perpendicular to the tensile stress axis, while under mixed-mode I/Ill (tensile/shear stress) cyclic loading, cracks were sinuous and did not propagate in the direction perpendicular to the main tensile stress axis. Under the mixed-mode cyclic loading, cracks were much easier to propagate, suggesting that shear stress intensified the role of tensile stress. In addition, shear stress promoted the interaction between cracks, resulting in easier coalescence of cracks.     

县臂板固有特性几种情况的分析比较

采用两种有限单元（矩形板弯元、三角形板弯元）和两种质量矩阵形式（集中质量矩阵、一致质量矩阵）计算等厚度方形悬臂板的固有频率和固有振型，对四种单元／质量矩阵组合形式的固有特性进行了分析比较；指出这些组合形式的数值解与理论解相比产生误差的原因及其改进办法；对变厚度正方形悬臂板（翼而）和等厚度梯形悬臂板（翼面）的固有特性作了启示性分析说明；从中看出不同结构形式悬臂板的固有特性的特点．     

问题解答

致读者:本刊1980年第11期刊载了“爆炸成型大型封头”后,收到不少读者来信,现请作者就大家提出的问题综合答复如下。〔答〕:爆炸成型的原理是利用雷管引爆,炸药在爆炸的一瞬间释放出的能量使坯料成型。爆炸瞬时产生的冲击波到达坯料表面时,峰值压力可达数千大气压,故坯料成型也是在一瞬间,因此,爆炸成型与机械模压不一,它属于高能高速成型技术。无模爆炸成型不需要压机和金属模具,但也有用胎模圈和压边圈限制     

TS分子筛的催化氧化性能研究

用自掣是四丙基溴化铵（ＴＰＡＢｒ）部分取代四丙基氢氧化铵（ＴＰＡＯＨ）为模板剂,在Ｎａ＾＋离子存在下,合成出结构优良的ＴＳ－１分子筛。在丙烯Ｈ２Ｏ２氧化制环氧丙烷反应中,考察了合成的ＴＳ－１分子筛的催化活性,催化剂的预处理。用量、利用次数、再生和反应温度与时间对反应的影响。研究表明,不同的模板和合成条件明显影响分子筛的晶粒大小。晶粒度为０．４￣０．７μｍ的ＴＳ－１分子筛经１０％ＮＨ４Ａｃ预处理后,