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离子色谱法测定高效聚合氯化铝中的硫酸根 总被引:1,自引:0,他引:1
研究了用离子色谱法测定高效聚合氯化铝中SO^2-4的方法,用离子交换法去除Al^3+等金属离子,利用HCL和H2SO4的沸点差去除Cl^-,然后用离子色谱法测定PACS中的SL^2-4,样品测定结果令人满意。 相似文献
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本文研究了应用ICP-MS法测定钢铁中微量杂质元素(As,Sn,Sb,Pb,Bi)的实验方法,考察了内标元素,试样溶解介质,酸度,分离,富集条件,样品基体等因素对测定结果的影响,用数学公式校正HCl对测定As的干扰。实验结果表明,用硝权或王水溶解样品,In为内标元素,数学校正消除谱线及非谱线干扰,按此方法测定标准钢样中上述微量杂质元素所得结果与推荐值吻合RSD小于8%,可直接进行钢铁样品中“五害” 相似文献
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ICP—AES法同时测定铝镁锗硅合金中铝,镁,锗,硅 总被引:1,自引:0,他引:1
本文报道了用具有二维电荷注入检测器(CID)和端视等离子体炬的全谱直读等离子体光谱仪,同时测定Al-Mg-Ge-Si合金中Al-Mg-Ge-Si的方法。试样用HNO3-HF溶解后,加H3BO3络合过量的F,并用其中的B为内标进行测定,以改善测量的精密度与准确度。合成试样的回收率为99.1%-101.0%,样品测定的相对标准偏差小于1%。方法简便、准确,用于样品分析,结果满意。 相似文献
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采用真空浸渗法制备了MgLiAl/SiC复合材料,系统研究了不同基体合金成分的MgLiAl/SiC复合材料组织,性能及界面结构。研究结果表明,MgLiAl/SiC复合材料界面结合良好,没有界面反应物。复合强化可明显提高MgLiAl合金的抗拉强度和弹性模量。 相似文献
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本文着重介绍了ZCuSn5Zn5Pb5、(ZCuSn6Zn6Pb3)、ZCuSn10P1、ZCuAl10Fe3、ZCuZn25A16Fe3Mn3、ZCuZn38Pb2Mn2、美国材料T—105、T—115等铜合金采用离心铸造时,如何控制铸件质量等方面的实践经验和主要工艺方法。 相似文献
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大气中五氧化二磷测定的研究 总被引:4,自引:0,他引:4
研究了用钼兰比色法测定大气中五氧化二磷的方法,使用过氧烯滤膜采集大气样品,用SnCl2甘油溶液为还原剂,研究了钼酸铵的用量,显色时的酸度等条件的影响,还对硅和砷的干扰和消除方法进行研究,本方法通过了标准方法验证程序,表明该的精密度和准确性高,适用于大气环境中五氧化二磷的测定。 相似文献
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使用S-360型高分辩扫描电镜及X-射线能谱仪、波谱仪对SiC颗粒、Cf纤维增强Al基复合材料的断口及合金结构进行了观察,对其中纤维排列与分布,界面元素的测定,纤维与基体结合的状况进行了分析,提出了在扫描电镜上定量计算Al基复合材料中纤维面积百分比含量的方法。 相似文献
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针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具。利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率。 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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Polyvinyl pyrrolidone-Iodine complex (PVP-I) molecules were impregnated into the anodic oxide of an aluminum disk specimen. It was rubbed against a silicon nitride ball specimen using a ball-on-disk type friction test rig. Over the limited range of parameters studied (load: 0.2-1.0 N, sliding velocity: 0.6 mm/s, and sliding distance: 1-7 m), the coefficient of friction decreased to a value as low as 0.01 from values of 0.3 to 0.7 for the anodic oxide surface. Single-crystal iodine rubbed against silicon nitride showed a coefficient of friction of 0.1. The low coefficient of friction is attributed to the thin PVP-I film on the relatively hard anodic oxide. The mechanism of coefficient of friction reduction is the same as that of a thin soft film on a hard substrate. 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献