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Ni-Co合金镀层的硬度及结构研究刘林静,邹德宁,胡书茂,王冬,李科欣,张英波西安建筑科技大学冶金工程学院摘 要:在硫酸盐体系中采用单一变量法研究了电流密度,镀液温度和pH值对电镀Ni-Co合金镀层硬度的影响规律,确定了电镀Ni-Co合金镀层的优化工艺条件:镀液温度45℃,镀液pH值3,电流密度6A/dm2;于该条件下在铜铬锆合金基体上制备出了硬度高,结合性能良好的Ni-Co合金镀层,并研究了退火温度对Ni-Co合金镀层硬度及织构的影响规律.结果表明,Ni-Co合金镀层硬度随退火温度的升高先提高后降低,300℃时HV0.05最高为506.2;退火后镀层呈较强的(111)织构.关键词:电镀;Ni-Co合金镀层;单一变量法;硬度;结合性能;退火;......
固溶处理对Ni-Co基高温合金反常动态应变时效的影响田成刚1,崔传勇1,谷月峰2,孙晓峰11. 中国科学院金属研究所2. 日本国立材料研究所摘 要:研究了亚固溶和过固溶处理对Ni-Co基高温合金在400和450℃和不同应变速率下拉伸时的锯齿状塑性失稳现象的影响.实验结果表明,过固溶合金的晶粒尺寸和二次γ′相间距大于亚固溶合金.2种固溶处理后的合金都表现为反常动态应变时效,其锯齿状流变现象都是由置换固溶原子和可动位错的相互作用引起的.2种固溶处理后锯齿状流变的临界应变量的差别与合金内二次γ′相的间距和塑性变形时合金内位错密度有关;其应力差值的区别与塑性变形时合金内位错密度及由晶界控制的扩散有关.关键词:Ni-Co基高温合金;动态应变时效(DSA);激活能;置换固溶原子;临界应变量;应力差值;......
文章编号:1004-0609(2015)-05-1285-09 Co2+含量对镀Ti金刚石-Ni-Co复合电沉积的影响 张 鹂,王日初,彭超群,张 纯,谭时雨,王乃光 (中南大学 材料科学与工程学院,长沙 410083) 摘 要:采用电镀法制备镀Ti金刚石-Ni-Co复合镀层,研究镀液中Co2+含量对镀层形貌和性能的影响,并通过电化学阻抗谱研究Ni-Co复合电沉积过程.结果表明:当镀液中未添加Co2+时,所制备的镀Ti金刚石-Ni复合镀层内凹痕较多；镀液中添加Co2+后,镀Ti金刚石-Ni-Co复合镀层内凹痕消失,晶粒均匀.随着镀液中Co2+含量的增加,所制备的镀Ti金刚石复合镀层的显微硬度先增加后减少.当镀液中Co2+含量为6%(摩尔分数)时,在-0.85 V电位下Ni-Co共结晶电化学阻抗谱的电荷转移电阻最大,制备的镀Ti金刚石-Ni-Co镀层内金......
高频脉冲电镀Ni-Co合金在3.5%NaCl溶液中的耐蚀性 赵宇1,曹克宁1,许韵华1,杨玉国1,宫晓静1 (1.北京交通大学理学院化学所,北京,100044) 摘要:用电化学方法研究了高频脉冲电镀Ni-Co复合镀层在NaCl溶液中的耐蚀性,结果表明,随着频率的增加,沉积层表面更加致密,均匀,在3.5%NaCl溶液中Ni-Co镀层的腐蚀失重明显减小,腐蚀失重速率变慢;高频和直流电铸Ni-Co复合镀层的阳极极化曲线形状相似,随频率增加,自腐蚀电位正移,自腐蚀电流降低.可见,高频率对沉积层的细化有重要影响,并使镀层的耐蚀性提高. 关键词:高频脉冲电镀; Ni-Co; 耐蚀性; [全文内容正在添加中] ......
Flotation separation of marmatite from pyrrhotite using DMPS as depressant SUN Wei(孙 伟), LIU Run-qing(刘润清), CAO Xue-feng(曹学锋), HU Yue-hua(胡岳华) School of Minerals Processing and Bioengineering...; Abstract: Mercapto organic compound DMPS was used as the depressant for separation of copper activated marmatite from pyrrhotite in the presence......
J. Cent. South Univ. (2017) 24: 1252-1262 DOI: 10.1007/s11771-017-3529-2 Particle size distribution of coal and gangue after impact-crush separation YANG Dao-long(杨道龙)1, LI Jian-ping(李建平)1, DU Chang..., University of Utah, Salt Lake City, UT84112-0114, USA Central South University Press and Springer-Verlag Berlin Heidelberg 2017 Abstract: Based on the separation and backfilling system of coal......
J. Cent. South Univ. (2017) 24: 1727-1735 DOI: https://doi.org/10.1007/s11771-017-3580-z A hybrid zeolitic imidazolate framework Co-IM-mIM membrane for gas separation GAO Zheng-cai(高正才)1, LI Li-qing... potential applications for efficient H2 separation. Key words: Co-IM-mIM membrane; secondary growth; gas permeation; separation 1 Introduction In the past 10 years, metal organic frameworks (MOFs) have......
Insights in active pulsing air separation technology for coarse coal slime by DEM-CFD approachDONG Liang(董良), ZHAO Yue-min(赵跃民), XIE Wei-ning(谢卫宁), DUAN Chen-long(段晨龙), LI Hao(李浩), HUA Cheng-peng(华成... and extend its application, active pulsing air separation technology was investigated by DEM-CFD coupling simulation approach. The results show that the ash content of feed is reduced by 10%-15......
Ni-Co合金电铸工艺及性能研究 赵文轸1,卢秉恒1,王伊卿1,唐一平1 (1.西安交通大学) 摘要:通过Ni-Co合金的电铸工艺试验,考察了电铸工艺对电铸合金层中钴含量的影响,并对电铸层进行了硬度,应力测试.实验结果表明,随镀液中钴含量和电铸温度的升高,合金电铸层中钴含量升高;随阴极电流密度的增大,合金电铸层中钴含量降低.合金电铸层硬度随电铸层中钴含量增加而升高;随电铸层中钴含量升高,合金电铸层中拉应力减小,有向压应力转化的趋势. 关键词:电铸:镍钴合金:成分; 硬度:应力; [全文内容正在添加中] ......
J. Cent. South Univ. (2018) 25: 38-50 DOI: https://doi.org/10.1007/s11771-018-3715-x Effect of montmorillonite on hydrate-based methane separation from mine gas ZHANG Qiang(张强)1, 2, 3, WU Qiang(吴强... (SDS) and THF-SDS with/without MMT respectively to investigate the effect of montmorillonite (MMT) on separation characteristics of methane recovered from mine gas based on hydrate method......
