共查询到17条相似文献,搜索用时 156 毫秒
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本文主要论述了离心球墨铸铁管生产中原铁水的五大元素的直读光电光谱分析,以及球化处理后铁水中五大元素及残留镁的直读光电光谱分析。由于采用快速急冷的薄片样,试样完全白口化,解决了灰铸铁及球墨铸铁试样白口化难的问题;采用60#刚玉砂轮预磨,46#刚玉砂纸研磨试样,实践证明,选择合适的光谱分析条件,灰铸铁及球墨铸铁中五大元素及镁的分析结果完全达到生产要求。 相似文献
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灰口铸铁中碳的光电直读光谱分析 总被引:1,自引:0,他引:1
本文研究了火花光源的脉冲频率与灰口铸铁预激发区(预燃区)的金相组织的关系,优选了灰口铸铁中碳的光电直读光谱分析的最佳条件,对灰口铸铁试样的分析获得满意的结果。 相似文献
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介绍了铁基线材、高铬铸铁、高锰钢等3种钢铁的光电光谱定量测定方法。该方法是通过选用与分析材质同基体,主成分接近的标准样品绘制校准曲线,采用自编的计算机校正程序,找出试样的光谱分析值和化学分析值之间的关系模型,并将模型通过计算机程序拟合到控制样品中,当进行材质测定时,只需要在日常标准化操作后将拟合好的控制样品对校准曲线进行控样校正,就可以直接进行试样的测定。该测定方法实用,结果可靠,适用于无相同标准样品条件下的试样光谱定量分析。 相似文献
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钇基重稀土变质处理对高铬铸铁冲击韧度的影响 总被引:2,自引:0,他引:2
高铬白口铸铁由于硬度高且具有一定的冲击韧度,因而成为当前及今后最为实用的抗磨材料之一。研究发现,决定高铬铸铁抗磨性能的不仅是其硬度指标,更为重要的则是其冲击韧度。因此,如何提高高铬铸铁抗磨材料的冲击韧度成为提高材料抗磨性能的关键。通过材料设计、铸造和热处理工艺试验探索了如何提高高铬铸铁抗磨材料的冲击韧度。 相似文献
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研究了不同密度和厚度的碳气凝胶薄片的制备及其表面致密层去除工艺。在以间苯二酚、甲醛为原料制备有机及碳气凝胶块体材料的基础上,结合自制活动式微模具成型工艺,制备了厚度在80~350 μm,密度在50~600 mg·cm-3范围内变化的碳气凝胶薄片。采用场发射扫描电镜、X射线相衬成像和表面轮廓仪-台阶仪等手段对其表面和内部微观结构进行了表征。测试结果表明,碳气凝胶薄片与块体的内部结构相同,但薄片表面存在一层和内部结构截然不同的致密层。采用不同粗糙程度的材料对薄片进行了表面微处理,成功去除该致密“皮”层。 相似文献
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研究了不同密度和厚度的碳气凝胶薄片的制备及其表面致密层去除工艺。在以间苯二酚、甲醛为原料制备有机及碳气凝胶块体材料的基础上,结合自制活动式微模具成型工艺,制备了厚度在80~350 μm,密度在50~600 mg·cm-3范围内变化的碳气凝胶薄片。采用场发射扫描电镜、X射线相衬成像和表面轮廓仪-台阶仪等手段对其表面和内部微观结构进行了表征。测试结果表明,碳气凝胶薄片与块体的内部结构相同,但薄片表面存在一层和内部结构截然不同的致密层。采用不同粗糙程度的材料对薄片进行了表面微处理,成功去除该致密“皮”层。 相似文献
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Thin high-carbon iron films were deposited by pulsed laser deposition onto grids for transmission electron microscopy using pre-combined carbon/iron targets with equal area ratio. The deposited films of about 20 nm in thickness were directly characterized by transmission electron microscopy. The films showed a variety of phases, surprisingly also including the NaCl-type FeC phase, which was theoretically predicted in the literature. For comparison, thin high-carbon stainless-steel films were deposited onto oxidized Si wafers with different carbon ratios in the targets (10, 20, 40 and 50 at.%). These films were characterized by means of Mössbauer Spectroscopy, the magneto-optical Kerr-effect, grazing incidence X-ray diffraction and Rutherford backscattering spectrometry. With these methods clearly defined multilayer-structures were observed which could lead to interesting magneto-resistance phenomena if the thickness of the multilayers can be controlled by the processing parameters. 相似文献
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通过各种材料的试验和压机设备因素的测定,总结了金刚石生长过程的特性:金刚石晶体是在石墨(G)-触媒(Me)界面上生长;因电阻R(G)>R(Me)、温度T(G)>T(Me)以及与外界热交换等原因,使合成腔内产生压力、温度梯度,成为金刚石生长之驱动力。梯度过大过小对金刚石生长均不利;金刚石晶体在G-Me界面两侧是非对称性生长;每个晶粒表面有一特殊结构约20 μm左右厚的金属薄膜,它起到运载碳源和催化的双重作用。要合成粗粒高强金刚石,需要有一个稳定的合成体系。本文分析了该体系状态的性质及稳定的必要性与稳定的具体方法。 相似文献
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本文提出了一种将镀锆管及镍-锆二元基体改进剂联合用于测量钢铁及合金中微量硼的技术。对其效能进行了考察,发现它能明显地提高测硼的分析灵敏度和降低记忆效应。应用该技术测定了七份实样,均获得满意结果。 相似文献
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《Current Applied Physics》2003,3(2-3):141-147
Photoirradiation effects of poly(p-pyridyl vinylene), PPyV/poly(3-hexylthiophene), P3HT and polypyridine, PPy/poly(2-methoxy-5-dodecyloxy-p-phenylene vinylene), MDOPPV heterostructure photoelectric conversion devices have been investigated. The photovoltaic characteristics of the heterostructure photoelectric conversion device are considerably improved from those in a single-layer photoelectric conversion device. Quenching of photoluminescence both in the PPyV layer film and in the P3HT layer film has been observed in the PPyV/P3HT heterostructure film. The observed photoirradiation effects of the heterostructure device have been discussed in terms of interfacial photoinduced charge transfer between P3HT and PPyV. 相似文献
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P. LEMERLE 《Journal of sound and vibration》2002,250(2):181-196
Wave propagation methods allow the deduction of the viscoelastic damping properties of materials from the waveform pattern of a transitory wave: the wave profile is recorded at two travel distances in a thin bar made of the medium studied. In the case of linear viscoelasticity, the characteristics of the material are deduced directly from the transfer function of the two pulses measured. From a theoretical point of view, these methods are of great interest as they bridge a gap between vibratory methods and ultrasonic methods, allowing results to be obtained in a frequency range covering one and a half to two decades in the audiometric range (20 Hz-20 kHz). However, they have not been used much in industrial applications due to the difficulty and cost involved in producing samples in the form of bars. This study shows how this type of method can be adapted to measuring the viscoelastic properties of damping materials using reduced size and common shaped samples such as end-stop buffers. 相似文献