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接触反应法制备颗粒增强型金属基复合材料 被引量:6
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作者 张二林 曾松岩 +1 位作者 曾晓春 李庆春 《材料导报》 EI CAS CSCD 1996年第1期68-71,共4页
介绍了一种新型的金属基复合材料的制备方法——接触反应法,对比分析用该法制得的复合材料的组织和性能表明,复合材料具有弥散和细小(<0.1μm),且均匀分布的组织特点和优良的室温和高温力学性能。
关键词 接触反应法 金属基 复合材料 微观组织
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碳对接触反应法制备TiC-Al_2O_(3P)/Al复合材料组织的影响 被引量:5
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作者 张瑞英 史志铭 李红霞 《材料热处理学报》 EI CAS CSCD 北大核心 2009年第5期30-34,共5页
以Al、TiO2、C为原材料,用接触反应法制备了TiC-Al2O3P/Al复合材料,采用XRD和SEM手段测定了材料的相组成、组织形貌及相分布,分析了碳含量对组织的影响。试验结果表明,该复合材料主要由分布于Al基体中的球状或近球状的TiC颗粒、不规则的... 以Al、TiO2、C为原材料,用接触反应法制备了TiC-Al2O3P/Al复合材料,采用XRD和SEM手段测定了材料的相组成、组织形貌及相分布,分析了碳含量对组织的影响。试验结果表明,该复合材料主要由分布于Al基体中的球状或近球状的TiC颗粒、不规则的Al2O3颗粒和少量的TiAl3组成,且随含碳量的增加,TiAl3减少;当C和TiO2比超过1.5后,TiAl3基本消失,但出现TiC2相。 展开更多
关键词 铝基复合材料 接触反应法 显微组织
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毛细管电泳接触反应法测定血清中铁传递蛋白的浓度 被引量:2
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作者 丁永生 林炳承 马银法 《分析化学》 SCIE EI CAS CSCD 北大核心 1998年第5期524-527,共4页
建立了一种测定血清中铁传递蛋白(transferrin)的毛细管电泳接触反应(catalyticmethod)方法.利用血清中铁传递蛋白计量化学结合铁的性质,用标准铁饱和铁传递蛋白,通过对铁准确定量,测定血清铁传递蛋... 建立了一种测定血清中铁传递蛋白(transferrin)的毛细管电泳接触反应(catalyticmethod)方法.利用血清中铁传递蛋白计量化学结合铁的性质,用标准铁饱和铁传递蛋白,通过对铁准确定量,测定血清铁传递蛋白的浓度。对0. 50~10.0 umol/L的标准铁溶液做回归曲线,线性回归系数r=0.995。对七个健康成人的血清铁传递蛋白进行分析,获得实验结果中铁传递蛋白的浓度(CTf)分别是23.9、25.7、26.9、24.5、23.2、25.5和 23.7 umol/L。此方法只需要30 uL血清,2h的样品预处理时间。毛细管电泳分离过程6 min. 展开更多
关键词 铁传递蛋白 血清 毛细管电泳 接触反应法 分析
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亚微米碳酸锰的制备及形貌控制 被引量:6
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作者 吕春玲 张景林 《硅酸盐学报》 EI CAS CSCD 北大核心 2007年第3期377-380,共4页
用硫酸锰和碳酸氢铵点接触反应法制备了亚微米级碳酸锰(MnCO3),分析了MnCO3的粒度和形貌控制。用透射电镜和粒度分析仪表征了实验结果。结果表明:由反应离子浓度决定的溶液过饱和度是影响MnCO3粒度和形貌的关键因素,当离子浓度比[CO32-]... 用硫酸锰和碳酸氢铵点接触反应法制备了亚微米级碳酸锰(MnCO3),分析了MnCO3的粒度和形貌控制。用透射电镜和粒度分析仪表征了实验结果。结果表明:由反应离子浓度决定的溶液过饱和度是影响MnCO3粒度和形貌的关键因素,当离子浓度比[CO32-]/[Mn2+]在1~10范围内增大时,MnCO3粒度呈递减趋势;当[SO42-]/[Mn2+]在1~6范围内增大时,MnCO3的结晶速度减慢,而且晶型由不规则型向立方型过渡。另外,较高的超声频率和较低的反应温度都有利于生成超细MnCO3沉淀。实验中获得了400~500nm的立方型MnCO3颗粒。 展开更多
关键词 碳酸锰 粒度 形貌控制 离子浓度 超声频率 反应温度 接触反应法
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厌氧膨胀颗粒污泥床处理高浓度链霉素含硫有机废水试验研究 被引量:9
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作者 吴根 赵秀梅 +1 位作者 吴红兵 宋存义 《环境污染治理技术与设备》 CSCD 北大核心 2003年第9期31-34,62,共5页
介绍了采用厌氧膨胀颗粒污泥床 (EGSB)反应器 -生物接触氧化法日处理 2 0 0t高浓度链霉素含硫有机废水的生产性试验研究。试验结果表明 ,厌氧EGSB反应器在控制中温发酵 (35± 1℃ )条件下 ,以低浓度CODCr2 0 0 0— 70 0 0mg/L ,CODC... 介绍了采用厌氧膨胀颗粒污泥床 (EGSB)反应器 -生物接触氧化法日处理 2 0 0t高浓度链霉素含硫有机废水的生产性试验研究。试验结果表明 ,厌氧EGSB反应器在控制中温发酵 (35± 1℃ )条件下 ,以低浓度CODCr2 0 0 0— 70 0 0mg/L ,CODCr/SO2 -4=7— 10进水 ,可有效降低反应器中毒性物质的抑制作用 ;进水CODCr在 70 0 0— 130 0 0mg/L ,水力停留时间(HRT)为 3— 5h ,pH值为 6 8— 7 2条件下 ,EGSB的最大容积负荷 15 8kgCODCr/m3 ·d ,对CODCr去除率可达 75 % ,对SO2 -4去除率也可有效地控制在 6 0 %— 70 %。进一步通过好氧生化处理 ,CODCr总去除率可达 91 3%。 展开更多
关键词 厌氧膨胀颗粒污泥床 有机废水 废水处理 EGSB 反应器-生物接触氧化 链霉素
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利用两级氧化工艺处理生物精细化工污水 被引量:4
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作者 杨祝平 郭淑琴 《水工业市场》 2009年第Z1期78-81,共4页
通过对广州小虎岛(小虎精细化工岛)污水处理厂的工程简介,浅述利用两级氧化工艺处理工业(生物精细化工)污水,其主体处理工艺为:水解酸化+接触氧化法+膜生物反应器(MBR)+活性炭吸附。
关键词 小虎精细化工岛 两级氧化 水解酸化+接触氧化+膜生物反应器(MBR)+活性炭吸附
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Purification of Lactic Acid by Heterogeneous Catalytic Distillation Using Ion-exchange Resins 被引量:9
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作者 马利 张阳 杨基础 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第1期24-31,共8页
The purification of lactic acid based on the esterification of raw lactic acid from fermentation broth and then the catalytic distillation hydrolysis of methyl lactate simultaneously to achieve pure lactic acid is rep... The purification of lactic acid based on the esterification of raw lactic acid from fermentation broth and then the catalytic distillation hydrolysis of methyl lactate simultaneously to achieve pure lactic acid is reported. The esterification kinetics of lactic acid with methanol catalyzed by strong-acid cation-exchange resins (Amberlyst-15,D001, D002, NKC, 002) was studied under the condition that simulates the real catalytic environment. Experimental results were correlated by a Langmuir-Hinselwood model and the nonideality of the solution was taken into account by using activities calculated by the universal quasichemical functional group activity coefficient (UNIFAC) method.A good agreement between the model and the experimental data was achieved. Continuous purification experiments were conducted to find the optimum column configuration and operation condition for the system. The effects of various parameters, e.g. the length of different section of the column, feed rate and ratio of reactants, packing material and catalyst type, were studied. This novel system shows good separation results in lab scale, and is potential for industrial application. 展开更多
关键词 lactic acid catalytic distillation PURIFICATION ion-exchange resin HYDROLYSIS
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Real Time Math Simulation of Contact Interaction during Spacecraft Docking and Berthing 被引量:2
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《Journal of Mechanics Engineering and Automation》 2014年第1期1-15,共15页
Contact reactions of guide surfaces of assembly interfaces lead to the decreasing of theirs lateral and angular misalignments. The focus of this paper is the development of algorithms for computation of guide surfaces... Contact reactions of guide surfaces of assembly interfaces lead to the decreasing of theirs lateral and angular misalignments. The focus of this paper is the development of algorithms for computation of guide surfaces contact forces with acceptable engineering accuracy for real time simulation of assembly operations. Therefore, each complex guide surface is described as a set of contacting elements. Each contacting element for one's part can be represented by a finite set of geometric primitives which geometry is described by low order algebraic equations. So contact conditions and geometric parameters for all pairs of primitives are determined by analytical expressions. Math models are developed for two classes of contact interaction. The first class includes all cases when each contacting surface has several degrees of freedom of motion. Therefore, contact reactions introduced into differential equations of motion are calculated by using contacting elements penetrations, stiffness and damping parameters. The second class corresponds to all cases when one of contacting surfaces has insignificant inertia and only one degree of freedom of relative displacement counteracted by a spring. Here contact reactions are calculated from spring tension with any practical accuracy. This is very useful in some practical applications. Presented algorithms provide real time simulation together with some approaches for reduction of redundant comnutations. 展开更多
关键词 DOCKING BERTHING contact interaction real time math simulation.
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Study on the Carbon-Methanation and Catalytic Activity of Ru/AC for Ammonia Synthesis 被引量:4
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作者 祝一锋 李小年 +1 位作者 季德春 刘化章 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第3期384-387,共4页
The effects of promoters K, Ba, Sm on the resistance to carbon-methanation and catalytic activity of ruthenium supported on active carbon (Ru/AC) for ammonia synthesis have been studied by means of TG-DTG (thermalgrav... The effects of promoters K, Ba, Sm on the resistance to carbon-methanation and catalytic activity of ruthenium supported on active carbon (Ru/AC) for ammonia synthesis have been studied by means of TG-DTG (thermalgravity-differential thermalgravity), temperature-programmed desorption, and activity test. Promoters Ba,K, and Sm increased the activity of Ru/AC catalysts for ammonia synthesis significantly. Much higher activity can be reached for Ru/AC catalyst with bi- or tri-promoters. Indeed, the triply promoted catalyst showed the highest activity, coupled to a surprisingly high resistance to methanation. The ability of resistance of promoter to methanation of Ru/AC catalyst is dependent on the adsorption intensity of hydrogen. The strong adsorption of hydrogen would enhance methanation and impact the adsorption of nitrogen, which results in the decrease of catalytic activity. 展开更多
关键词 RUTHENIUM CATALYST METHANATION ammonia synthesis
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Factors affecting the dynamic response of pre-stressed anchors after transient excitation 被引量:1
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作者 Xu Huijun Li Qingfeng 《Mining Science and Technology》 EI CAS 2011年第3期395-399,共5页
The wide application of pre-stressed bolting technology in coal mine tunnels has made the nondestructive stress wave reflection method of determining bolting quality an important one. The effect of the support plate o... The wide application of pre-stressed bolting technology in coal mine tunnels has made the nondestructive stress wave reflection method of determining bolting quality an important one. The effect of the support plate on the dynamic response of the pre-stressed anchor is of particular interest. A theoretical analysis and numerical simulations are used to identify the factors affecting the contact stress between the support plate and the rock wall. A formula allowing the calculation of contact stress is presented. Stress wave propagation through the nut, support plate, and rock wall are predicted. The dynamic response signals were measured in the field using prestressed anchors pre-tightened to different torques. The effects from the support plate on the dynamic response were recorded and the results compared to the predictions of pre-stressed anchor. This work provides a theoretical reference for the signal processing of dynamic reflected wave signals in anchor bolts. 展开更多
关键词 Support plate effectContact stressPre-stressed anchorDynamic response
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Mg含量对原位TiC/Al-4.5Cu复合材料微观组织与拉伸性能的影响 被引量:1
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作者 梁艳峰 董晟全 李高宏 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2013年第7期1377-1381,共5页
采用接触反应法制备了原位TiC/Al-4.5Cu复合材料,借助光学显微镜、透射电子显微镜研究了向基体合金中添加不同含量的Mg对复合材料微观组织和拉伸性能的影响。结果表明:随着Mg的添加量由0.8%(质量分数,下同)增加到2.0%,TiC/Al-4.5Cu复合... 采用接触反应法制备了原位TiC/Al-4.5Cu复合材料,借助光学显微镜、透射电子显微镜研究了向基体合金中添加不同含量的Mg对复合材料微观组织和拉伸性能的影响。结果表明:随着Mg的添加量由0.8%(质量分数,下同)增加到2.0%,TiC/Al-4.5Cu复合材料的延伸率下降,而抗拉强度在1.5%Mg时,达到极值。与同等条件下制备的不含Mg的TiC/Al-4.5Cu复合材料相比,抗拉强度提高了17.7%,但延伸率下降了17.9%。TiC颗粒的细化有助于复合材料力学性能的提高,但针状Al2CuMg相的析出阻碍了复合材料塑性的进一步提高。TiC/Al-4.5Cu-Mg复合材料中TiC颗粒尺寸为100nm左右。 展开更多
关键词 原位TiC Al—4 5Cu复合材料 接触反应法 微观组织 拉伸性能
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TiAl_3相对原位TiC/Al-4.5Cu复合材料高温磨损行为的影响
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作者 梁艳峰 董晟全 +1 位作者 何子博 李高宏 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2017年第12期3843-3848,共6页
采用接触反应法制备了原位TiC/Al-4.5Cu复合材料,研究了微观组织中TiAl_3相对复合材料100~250℃高温下干摩擦磨损行为的影响。结果表明:高温下原位TiC/Al-4.5Cu复合材料磨损量均随载荷(15~55 N)增加而增加,但含TiAl_3相的复合材料磨损... 采用接触反应法制备了原位TiC/Al-4.5Cu复合材料,研究了微观组织中TiAl_3相对复合材料100~250℃高温下干摩擦磨损行为的影响。结果表明:高温下原位TiC/Al-4.5Cu复合材料磨损量均随载荷(15~55 N)增加而增加,但含TiAl_3相的复合材料磨损量始终较高。当载荷大于35 N,复合材料存在一个磨损加剧的临界转变温度;含TiAl_3相的复合材料该临界转变温度较低。TiAl_3相的存在降低了复合材料的耐磨性。 展开更多
关键词 原位TiC/Al-4.5Cu复合材料 接触反应法 干摩擦磨损
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