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Numerical Analysis of Powder Properties in Low Power Plasma Torch AN Lian-tong1,GAO Yang1,Yan Zhi-jun1,HEI Zhu-kun1 (1.Marine Engineering Collage, Dalian Maritime University, Dalian Liaoning 116026, China) 摘要:A mathematical model was presented to describe the particle trajectory, velocity and temperature properties in the low power plasma spraying torch (3.6 kW)in which powder particles were......
电感耦合等离子体原子发射光谱法测定船用钢中硼锆铌钨李绿叶,杜米芳中国船舶重工集团公司第七二五研究所摘 要:钢是船舶设计和建造的关键合金材料之一,化学成分影响其性能,现有分析方法的分析范围满足不了一些船舶先进材料成分范围的分析要求.针对目前船舶用钢中硼,锆,铌,钨的分析,采用9mL盐酸-3mL硝酸-1mL氢氟酸溶解样品,选择B 182.528nm,Zr 339.197nm,Nb 316.340nm,W 207.912nm为分析线并采用两点校正法扣除背景,建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定船用钢中硼,锆,铌,钨的方法.各元素的校准曲线线性相关系数在0.999以上;方法检出限均低于0.000 5%.按照实验方法测定两个标准物质(中低合金钢YSB C11219-94和......
锆,铜及均匀化处理对高导耐热铝合金电工圆杆性能的影响巩向鹏,张晓燕,黄鑫,张俊杰,林廷艺贵州大学材料与冶金学院摘 要:通过扫描电镜,X射线物相分析等方法,研究了Zr,Cu元素及均匀化工艺对高导耐热铝合金电工圆杆组织及性能的影响.结果表明,通过"添加Zr(0.10%)Cu(0.08%)+300℃×16h均匀化+83%轧制"处理后,试样综合性能较优,试样导电率为59.5%IACS,抗拉强度达到149 MPa,230℃保温1h,强度残存率为94.3%.关键词:锆,铜;高导耐热铝合金电工圆杆;抗拉强度;导电率;强度残存率;......
of the raw powders used in this study. The Zr, Ta and Ti powder particles are of irregular shapes. The mean particle sizes of the Zr, Ta and Ti powder are 11.86, 5.45 and 18.34 μm, respectively, as given... sintering temperature, and Ti promotes the diffusion of Ta powder during the flow, thereby promoting the densification. Figure 4(b) shows that the micro-hardness of Zr-Ta-Ti alloy is much higher than......
镀锌钢板表面氟锆酸盐/乙酰苯胺复合转化膜制备与性能研究马继辉1,郭瑞光1,钟萍21. 西安建筑科技大学西北水资源与环境生态教育部重点实验室2. 肇庆学院环境与化工学院摘 要:为了提高镀锌钢的耐蚀性能,以氟锆酸钾,乙酰苯胺为成膜物质,在镀锌钢表面制备了氟锆酸盐/乙酰苯胺有机无机复合转化膜.采用扫描电子显微镜(SEM),能谱仪(EDS),傅里叶变换红外光谱仪(FTIR),电化学工作站,中性盐雾试验(NSS)对复合膜进行了分析测试.结果表明:含乙酰苯胺特征官能团的复合膜为无定形结构,膜厚7μm,由Zn,Zr,C,O,F元素组成.经转化处理后,试样的腐蚀电位增加了97 mV,腐蚀电流密度降低了1个数量级,耐中性盐雾时间达96 h,耐蚀性能显著增强.关键词:镀锌钢;氟锆酸钾;乙酰苯胺;转化膜;耐蚀......
纯锆作中间层扩散连接TC4钛合金的接头组织与力学性能王东,曹健,代翔宇,亓钧雷,冯吉才哈尔滨工业大学先进焊接与连接国家重点实验室摘 要:采用纯Zr作中间层实现了TC4钛合金的扩散连接.通过扫描电镜(SEM),能谱分析(EDS),X射线衍射(XRD)等方法分析了接头界面的微观组织,研究了扩散连接工艺参数对接头界面组织及力学性能的影响.结果表明,界面处生成了成分均匀,连续的钛锆固溶体扩散层,同时扩散层中含有大量板条状的α′-Ti(钛马氏体)相;随着连接温度的升高和保温时间的延长,扩散层的厚度逐渐增加,接头室温抗剪强度呈现出先升高后降低的趋势;当连接温度为800℃,保温时间为40 min,连接压力为5 MPa时,接头室温抗剪强度最高,达到190 MPa.关键词:纯Zr中间层;TC4钛合金;扩散......
, Zhe-an SU, Xin YANG, Liu-xu CAO, Qing-zhong HUANG State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China Received 29 July 2013; accepted 27 February 2014 Abstract... developed such as powder doping, chemical vapor infiltration and liquid precursor impregnation, to introduce ZrC into C/C composites, which have been widely studied in previous works. LI et al [11......
.%) were prepared via powder metallurgy and hot working. The results indicate that the Ti-Zr alloys exhibit Zr-rich and Zr-lean areas with the same α-phase structure, and the Zr-rich area shows a slightly... content for the ductile-to-brittle transition of Ti and does not degrade the ductility. Key words: oxygen; Ti-Zr alloys; ductility; powder metallurgy 1 Introduction Titanium (Ti) and its alloys have......
X射线荧光光谱法测定矿物及试剂中氧化锆和氧化铪 赵宏风1,童晓民1,张伟民1 (1.东北大学分析化验中心,辽宁沈阳,110004) 摘要:采用四硼酸锂和硝酸锂作为熔剂熔融制备样品,同时加入Nb和Ta两种元素,分别作为Zr和Hf的内标,通过讨论各种谱线重叠干扰校正效果,分析比较各种内标校正方式,选择了二次干扰曲线法并依据一定顺序校正谱线重叠干扰和加内标元素校正基体效应,建立了测定氧化锆试剂及其矿物中含量范围较宽的氧化锆和氧化铪的X射线荧光光谱分析方法.对3个ZrO2含量差别较大的样品分别制样测定10次,相对标准偏差(RSD)为:ZrO2为0.098%,0.14%,0.78%;HfO2为0.71%,0.64%,3.52%.本方法ZrO2检出限为0.005 1%,HfO2为0.008 4%.通过模拟样品分析,本法测量值与理论加入值相一致;用于实际样品分析,测量值与化学值相吻合. 关键词......
KINETIC MODEL FOR POWDER INJECTION DESULFURIZATION S.R. Yu1,X.G. Bi1,Y. Jin1 (1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China) Abstract:The kinetic model for desulfurization using CaO-based powder injection has been proposed,which accords with the actual process of the experiment......
