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本文介绍了用空心阴极原子发射光谱法测定镍基高温合金中痕量元素铅、铋、碲、铊、银的方法。研究了空心阴极灯电流与元素蒸发行为的关系,从仪器工作条件的选择、电极尺寸选择,谱线选择等几个方面进行了试验,优化了分析参数,精密度和准确度结果表明,本方法简便、快速,可以用于高温合金中痕量元素的测定要求,RSD〈22%。 相似文献
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本研究建立了高分辨电感耦合等离子体质谱(HR-ICP-MS)法测定镍基高温合金中痕量元素。采用盐酸、硝酸和氢氟酸溶解镍基高温合金样品,根据待测元素同位素丰度大、干扰小、灵敏度高的原则,优化各待测元素的同位素和分辨率,有效消除了绝大多数多原子和双电荷离子的干扰。另外,考察了基体、合金成分和溶样酸对待测痕量元素的质谱干扰,通过选取合适的内标133Cs,可以克服基体效应并降低信号漂移。利用甲基异丁基酮萃取Cd,萃取效率达99.7%,消除了镍基高温合金中主成分Mo的质谱干扰。各痕量元素校准曲线的线性相关系数均大于0.999,方法检出限为0.002 1~0.074μg/g。用本方法分析镍基高温合金成分分析标准物质中的痕量元素含量,测定结果的相对标准偏差(RSD,n=6)在2.9%~7.8%之间,测定值与标准值非常接近。该方法前处理简单、分析速度快、结果准确可靠,能够满足镍基高温合金中痕量元素的检测需求。 相似文献
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试样采用盐酸、硝酸和氢氟酸溶解,用电感耦合等离子体原子发射光谱法(ICP-AES)测定镍基高温合金中铂(Pt)、钯(Pd)元素。本工作中优化了仪器工作参数,对待测元素分析线进行了选择试验,考察了高温合金基体和共存元素对待测元素的影响,最终确定了分析线分别为Pt 214.424 nm、Pd 340.458 nm,选定的待测元素分析线不受基体和共存元素的干扰,基体的其他影响可以通过在校准曲线溶液中进行匹配而消除。对高温合金中铂、钯元素测量的准确度、精密度和加标回收率进行了研究,回收率在96%~110%之间,RSD≤6%。 相似文献
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采用增重法测出了含铜和钛元素的镍基耐蚀合金在800℃空气中的高温氧化动力学曲线,并用扫描电镜及能谱仪对氧化膜的形貌和成分进行了分析,研究了铜和钛元素对合金高温氧化行为的影响。结果表明:随着铜元素含量的增多,合金的抗高温氧化能力逐渐变弱;在合金中加入一定量的钛元素可以使合金表面的氧化膜更加致密,增强合金的抗高温氧化能力。 相似文献
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氢化物发生-原子荧光光谱法测定Inconel 718合金中痕量硒 总被引:1,自引:0,他引:1
本文采用氢化物发生-原子荧光光谱法测定Inconel718合金中痕量硒。对影响其测定的负高压、灯电流、载气流量、屏蔽气流量、载流酸类酸度、硼氢化钾等因素进行了较为详细的研究,优化了测定条件,考察了Inconel718合金主要组成元素和基体元素对硒测定的影响。结果表明,用氟化氨溶液络合,柠檬酸溶液作干扰抑制剂能基本消除基体元素和主要组成元素的干扰。硒浓度在0~100μg/L与荧光强度有良好的线性关系,方法的检出限为0.0083μg/L。对铁镍基高温合金标准样品和Inconel 718合金样品进行9次测定,相对标准偏差为1.6%~3.5%。 相似文献
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介绍了采用电感耦合等离子体原子发射光谱法( ICP- AES)测定高温合金中贵金属元素Pt、Pd、Ir、Ru、Rh和Au的方法,试样采用盐酸、硝酸溶解,进行了仪器工作参数和待测元素分析线的选择试验,确定了仪器最佳工作条件,考察了合金基体和共存元素对待测元素的影响,确定的各待测元素分析线分别为Pt 265.945nm、Pd 340.458 nm、Ir 224.268 nm、Ru 240.272 nm、Rh 343.489nm、Au 242.795 nm.通过基体匹配消除基体的影响,实现了用电感耦合等离子体原子发射光谱法测定高温合金中贵金属元素Pt、Pd、Ir、Ru、Rh和Au的含量.进行了加入回收试验,回收率在84~112%之间,方法的检出限是0.003~0.01μg/mL,相对标准偏差小于8%. 相似文献
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本文选择了硝酸、王水、逆王水,进行碳钢、低合金钢溶样条件试验,以谱线强度为指标,溶解酸种类、溶解酸浓度、溶解酸用量、定容酸用量等四因素为变化条件,各因素中有三水平,即按正交实验表L_9(3~4)进行试验,编制计算程序,快速、科学地优选出最佳溶样条件—30ml NHO_3(1+5v/v)和3ml HCl,ICP-AES法同时测定铝、砷、铬、钴、铜、磷、锰、钼、镍、硅、锡、钛和钒13种元素。为确定测试方法的重复性(r)和再现性(R)而进行精密度试验。精密度数据是由10个实验室对7个样品作试验确定的。方法的回收率为94%-105%。精密度在8%以内。 相似文献
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采用ICP-AES法测定GH3128合金中硅、锰、钨、钼、铬、钛、铝、铁、锆等多种合金元素。系统研究了各元素4条分析谱线的光谱干扰情况,根据光谱干扰研究结果和分析谱线的灵敏度、信背比以及等效离子浓度等进行了分析线的选择。采用柠檬酸络合钨,基体匹配法消除共存元素干扰,效果良好。 相似文献
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Mott scattering factors are needed for the quantitative interpretation of elastic scattering phenomena in electron spectroscopy and microscopy. The inelastic mean free path of electrons has been deduced from the elastic peak intensity. The theoretical approach is based on the effective elastic cross section derived from the differential elastic cross sections. In the present work they are calculated using the partial wave expansion method, supplying as well the Mott scattering factors. Tabulated data are presented for a number of elements and 500–3000 eV electrons in steps of 2° or 5° of the scattering angle θ. The effective and total elastic scattering cross sections are also presented. 相似文献
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石油焦中Fe、Ni、V、Na、Si、Ti的ICP-AES测定 总被引:1,自引:0,他引:1
本文提出用ICP-AES法直接测定石油焦中Fe、Ni、V、Na、Si、Ti含量,该测试方法能满足我厂石油焦中金属元素的检测,测定结果的准确度和精密度均满足分析要求。 相似文献
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《仪器科学与技术》2013,41(4):439-440
ABSTRACT This paper presents some results of experimental research addressing the influence of different thermal insulation fillings on dynamic properties of industrial resistance temperature probes, based on a thin-film platinum resistance temperature detector. The experiments were carried out with four jacket thin-film resistance temperature probes, all having identical protection tube geometry, yet differing in the thermal insulation filling materials. Further, a comparison between transient response characteristics in water established experimentally and those based on simulations with electric–thermal analogy, is given. The results of these analyses can be applied to enhance the dynamic response of temperature measurement made by temperature probes in water. 相似文献
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Isaac GH Thompson J Williams S Fisher J 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》2006,220(2):119-133
When first introduced, total hip replacements offered pain relief and improved mobility in elderly patients. The success of this procedure in terms of long-term durability and restoration of function has led to its use in younger, more active patients. This has resulted in a commensurate increase in patient expectation regarding longevity and the degree to which function and lifestyle is restored. The bearing surface is a key feature of the performance of replacement joints. It is generally accepted that excessive amounts of wear debris preclude their long-term survivorship and hence there is an ongoing requirement for bearing surfaces which minimize debris generation. The purpose of this paper is to review the factors which affect the performance of so-called metal-on-metal bearings, to compare their performance with that of the other commonly used contemporary alternatives, metal and ceramic articulating against highly cross-linked polyethylene, and ceramic-on-ceramic, and finally to consider the potential solutions offered by new developments such as ceramic-on-metal and coatings applied to metal-on-metal bearings. 相似文献