共查询到20条相似文献,搜索用时 93 毫秒
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<正>由安徽、北京、重庆、福建、广东、广西、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、內蒙古、青海、山西、陕西、上海、四川、天津、新疆、云南、浙江等省(市、区)及成都、柳州、武汉、西安市等市铸造学会主办、四川省铸造学会承办的第十五届24省(市、区)4市铸造学术会议于2014年8月15-17日在成都市召开,来自全国铸造行业的150余名代表出席了会议。 相似文献
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《中国铸造装备与技术》2014,(4)
正受各兄弟省市铸造学会委托,由四川省铸造学会承办的第15届24省(市、自治区)4市铸造学术会议定于2014年8月15日起在成都市内新华饭店召开,同期将举办铸造设备、仪器、原辅材料推介展示会,热忱欢迎国内外专家、学者、广大铸造工作者前来进行学术和技术交流。会议主题:依靠技术进步促进铸造行业节能减排,科学推进铸造行业准入与建立铸造企业评价体系。主办单位:安徽、北京、重庆、福建、广东、甘肃、河北、河南、黑龙江、湖北、湖南、江苏、江西、内蒙古、青海、山西、陕西、上海、四川、天津、新疆、浙江、云南、广西等省(市、自治区)铸造学会及成都、柳州、武汉、西安等省辖市铸造学会。 相似文献
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转炉出钢过程常伴有钢水回磷现象,导致钢水磷含量上升甚至出格,影响钢材成品质量和经济技术指标。为有效控制转炉出钢过程回磷,通过现场取样、数据采集、模拟试验及FactSage软件分析了出钢过程钢水回磷机理,研究探讨了渣中FeO、SiO2、出钢温度、钢包渣碱度对回磷的影响。研究结果表明,出钢过程下渣,渣中FeO含量与出钢温度过高,钢包渣SiO2含量与碱度不在合适范围均会增大钢水回磷率,最高达41%。结合水钢生产实践,出钢温度控制为1 625~1 640 ℃、转炉终渣FeO质量分数为15%、钢包渣碱度为3.6~4.1、控制含硅合金加入、控制出钢过程下渣量的条件下,可高效调节出钢过程回磷,将回磷率降低至15%以下。通过控制出钢温度、终渣FeO、碱度等,可有效降低因下渣导致的回磷。 相似文献
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Z. Sun S.L. Zheng Y. Zhang 《金属学报(英文版)》2007,20(3):187-192
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process. 相似文献
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多元光谱拟合ICP-AES法同时测定铂中22个杂质元素 总被引:1,自引:0,他引:1
试样用HCl-HNO3溶解,采用多元光谱拟合(MSF)功能ICP-AES法同时测定铂中22个杂质元素:Pd、Rh、Ir、Ru、Au、Ag、Cu、Fe、Zn、Ni、Mn、Cr、Mg、Cd、Al、Ca、Pb、Sn、Bi、Si、Mo、Ti。对基体铂的影响、MSF功能、元素分析谱线、背景校正、仪器分析参数等进行了研究,确定了最佳实验条件。杂质元素测定范围Ag、Pd、Cu、Cr、Ti、Mn和Mo为0.0004%~0.05%;Rh、Ir、Pb、Fe、Mg、Al、Zn、Si、Bi、Ca、Cd、Sn、Au和Ni为0.0005%~0.05%;Ru为0.001%~0.05%;方法的相对标准偏差(RSD)和加标回收率分别为1.5%~8.1%和85.1%~118.5%。方法准确、快速、简便,已用于铂中杂质元素的分析。 相似文献
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目的: 总结重组人p53 腺病毒注射液(rAdp53)治疗的晚期实体肿瘤患者的资料, 初步评价其安全性与疗效。方法: 常规治疗失败的晚期实体肿瘤患者24 例, 其中肾癌5 例, 鼻咽癌4 例, 结直肠癌4 例, 黑色素瘤2 例, 非小细胞肺癌1 例, 食管癌1例, 贲门癌1 例, 胸腺癌1 例, 十二指肠癌1 例, 甲状腺癌1 例, 胰腺癌1 例, 子宫内膜癌1 例, 横纹肌肉瘤1 例。rAd-p53 给药方案为1 ×1012VP/次, 每周1次, 4 次为1 疗程。给药途径包括瘤内注射、支气管内喷洒、腹腔内注射、动脉灌注和静脉滴注。联合化疗18 例, 联合放疗2 例, 联合同期放、化疗1 例, 联合腹部热疗和吉非替尼1 例, 联合免疫治疗1 例,rAd-p53 单药治疗1 例。结果: 24 例患者中因早期进展而停药1 例, 接受1 疗程治疗20 例, 2 疗程治疗2例, 5 疗程治疗1 例。在可评价的21 例中, 部分缓解(PR) 5 例, 稳定(SD) 5 例, 进展(PD) 11 例, 有效率23.8%(5/21), 疾病控制率47.6%(10/21)。常见不良反应为自限性、I ~ II 度注射部位疼痛、寒颤、发热和肌肉酸痛。III 度发热2 例, 联合化疗者发生III ~IV 度骨髓抑制4 例, 骨痛加剧2 例, 一过性低血压1例。结论: 晚期实体瘤患者可耐受rAd-p53 治疗, 有必要进一步设计临床试验, 确定rAd-p53 联合常规治疗的有效性。 相似文献
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钢筋混凝土中钢筋锈蚀与防护研究概况 总被引:1,自引:0,他引:1
为了对进一步研究钢筋混凝土中钢筋的腐蚀与防护提供参考,本文通过查阅相关文献,对钢筋锈蚀对钢筋混凝土力学特性的影响、钢筋锈蚀的影响因素、钢筋锈蚀的检测与评定方法以及钢筋锈蚀的防护与修复技术进行了论述。结果表明,钢筋锈蚀对钢筋混凝土力学特性的影响有三个方面;氯化物、混凝土碳化、硫酸盐、水和氧气、环境温度、混凝土裂缝是影响钢筋锈蚀的因素;钢筋锈蚀的检测与评定方法有电位图法、电位梯度法、交流阻抗法、恒电流脉冲法、极化曲线法、线性极化法、光纤监测法。指出完善混凝土中钢筋锈蚀的智能检测方法,建立更符合工程实际的混凝土结构失效评估指标体系,研究具有实际应用价值的混凝土中钢筋锈蚀的防护方法及混凝土中已锈蚀钢筋的修复方法是今后研究的发展方向。 相似文献
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M.-F. Zhu W. Cao S.-L. Chen C.-P. Hong Y. A. Chang 《Journal of Phase Equilibria and Diffusion》2007,28(1):130-138
Driven by industrial demand, extensive efforts have been made to investigate microstructure evolution and microsegregation
development during solidification of multicomponent alloys. This paper briefly reviews the recent progress in modeling of
microstructures and microsegregation in solidification of multicomponent alloys using various models including micromodel,
phase field, front tracking, and cellular automaton approaches. A two-dimensional modified cellular automaton (MCA) model
coupled with phase diagram software PanEngine is presented for the prediction of microstructures and microsegregation in the
solidification of ternary alloys. The model adopts MCA technique to simulate dendritic growth. The thermodynamic data needed
for determining the dynamics of dendritic growth are calculated with PanEngine. After validating the model by comparing the
simulated values with the prediction of the Scheil model for solute profiles in the primary dendrites as a function of solid
fraction, the model was applied to simulate the microstructure and microsegregation in the solidification of Al-rich ternary
alloys. The simulation results demonstrate the capabilities of the present model not only to simulate realistic dendrite morphologies,
but also to predict quantitatively the microsegregation profiles in the solidification of multi-component alloys.
This article was presented at the Multi-Component Alloy Thermodynamics Symposium sponsored by the Alloy Phase Committee of
the joint EMPMD/SMD of The Minerals, Metals, and Materials Society (TMS), held in San Antonio, Texas, March 12-16, 2006, to
honor the 2006 William Hume-Rothery Award recipient, Professor W. Alan Oates of the University of Salford, UK. The symposium
was organized by Y. Austin Chang of the University of Wisconsin, Madison, WI, Patrice Turchi of the Lawrence Livermore National
Laboratory, Livermore, CA, and Rainer Schmid-Fetzer of the Technische Universitat Clausthal, Clauthal-Zellerfeld, Germany. 相似文献
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随着北极航行的发展及极地资源开发的需要,如何提高极地海洋环境服役材料的摩擦学性能愈发重要。在极地海洋环境中,碎冰、冰层和海水中的腐蚀性物质会使材料受到摩擦磨损、腐蚀及其耦合的影响;低温潮湿环境会增加材料的脆性、使材料表面覆冰、改变材料的摩擦磨损机理;强紫外线会加速涂层老化;这些因素都会降低材料的耐磨性能,最终导致材料失效。因此,极地海洋环境服役材料的摩擦学与材料的性能、服役寿命息息相关。本文介绍了极地探索所面临的摩擦磨损问题;阐述了极地温度、极地海洋大气及海水成分、海冰运动和极地微生物等极地海洋环境特点及其对材料摩擦学性能的影响;重点介绍了金属材料、无机非金属材料、高分子材料在极地海洋环境下的摩擦学进展;探讨了提升材料在极地海洋环境下的耐磨防腐技术,如改性、表面修饰等;最后,结合极地海洋环境服役材料摩擦磨损研究中所面临的问题及发展趋势,对未来极地海洋服役材料的摩擦学研究工作进行展望。 相似文献
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Carbon dioxide corrosion behavior of low-alloy pipeline steel with 1% Cr exposed to CO2-saturated solution was investigated by immersion experiment. SEM, EDX, TEM, EPMA and XRD were utilized to investigate the microstructure, corrosion morphologies, corrosion phases and elements distribution of corrosion scale. The results demonstrate that the microstructure of tested steel consists of ferrite and carbides. During the corrosion process, ferrite dissolves preferentially, leaving carbide particles behind. The residual carbide particles may promote the nucleation of FeCO3 crystal. The phase comprising of the inner layer is Cr compound, and the one of the outer layer is FeCO3. The formation process of corrosion scale can be illustrated as follows: Firstly, a thin scale consisting of thin inner layer and outer layer is formed, which represents poor corrosion resistance; then, the inner layer changes little, once it has been formed, and the outer layer becomes thick and compact, which demonstrates that a fine corrosion resistance is obtained. The chemical elements of chromium and molybdenum accumulate in the inner layer of corrosion scale. The corrosion behavior of low-alloy steel based on microstructure and morphology characterization is also discussed. 相似文献