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含铅铋系 2212 相生长动力学研究
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作者 蔡玉荣 孙祥云 +2 位作者 史文方 张平祥 周 廉 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 1999年第4期198-201,共4页
从生长动力学角度研究了 ( Bi, Pb)2 Sr2 Ca Cu2 Ox 超导相反应历程及成相规律。应用差示热分析 ( D T A), X 射线衍射 ( X R D), 扫描电镜 ( S E M), 能量色散谱仪 ( E D S) 等手段详... 从生长动力学角度研究了 ( Bi, Pb)2 Sr2 Ca Cu2 Ox 超导相反应历程及成相规律。应用差示热分析 ( D T A), X 射线衍射 ( X R D), 扫描电镜 ( S E M), 能量色散谱仪 ( E D S) 等手段详细分析了所得样品的成分、成分改变过程和微观形貌。结果表明: ( Bi, Pb) 2212相形成过程符合按成核生长机理进行的固相反应动力学关系。较大的过冷度下, 长时间的退火处理过程有利于有织构的( Bi, Pb)2212 相形成。 展开更多
关键词 相生长动力学 铅铋系2212 过冷度 超导
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锗硅/硅异质结材料的化学气相淀积生长动力学模型 被引量:1
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作者 戴显英 金国强 +7 位作者 董洁琼 王船宝 赵娴 楚亚萍 奚鹏程 邓文洪 张鹤鸣 郝跃 《物理学报》 SCIE EI CAS CSCD 北大核心 2011年第6期440-446,共7页
基于化学气相淀积(CVD)的Grove理论和Fick第一定律,提出并建立了锗硅(SiGe)/硅(Si)异质结材料减压化学气相淀积(RPCVD)生长动力学模型.与以前锗硅/硅异质结材料生长动力学模型仅考虑表面反应控制不同,本模型同时考虑了表面反应和气相传... 基于化学气相淀积(CVD)的Grove理论和Fick第一定律,提出并建立了锗硅(SiGe)/硅(Si)异质结材料减压化学气相淀积(RPCVD)生长动力学模型.与以前锗硅/硅异质结材料生长动力学模型仅考虑表面反应控制不同,本模型同时考虑了表面反应和气相传输两种控制机理,并给出了两种控制机理极限情况下的模型.本模型不仅适用于低温锗硅/硅应变异质结材料生长的表征,也适用于表征高温锗硅/硅弛豫异质结材料生长的表征.将模型计算值与实验结果进行了对比,无论是625℃低温下的应变SiGe的生长,还是900℃高温下的弛豫SiGe的生长,其模型误差均小于10%. 展开更多
关键词 SiGe/Si异质结材料 化学气淀积生长动力学模型 Grove理论 Fick第一定律
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Formation mechanism and growth kinetics of TiAl_(3) phase in cold-rolled Ti/Al laminated composites during annealing 被引量:4
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作者 Jian-yu ZHANG Yan-hui WANG +3 位作者 Zheng LÜ Qing-an CHEN Ya-yu CHEN He-zong LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第2期524-539,共16页
Cold-rolled Ti/Al laminated composites were annealed at 525−625℃for 0−128 h,and the interfacial microstructure evolution was investigated.The results indicate that only the TiAl_(3) phase was formed at the Ti/Al inte... Cold-rolled Ti/Al laminated composites were annealed at 525−625℃for 0−128 h,and the interfacial microstructure evolution was investigated.The results indicate that only the TiAl_(3) phase was formed at the Ti/Al interface;most of TiAl_(3) grains were fine equiaxed with average sizes ranging from hundreds of nanometers to several microns and the TiAl_(3) grain size increased with increasing annealing time and/or temperature,but the effect of annealing temperature on the TiAl_(3) grain size was far greater than that of annealing time.The growth of the TiAl_(3) phase consisted of two stages.The initial stage was governed by chemical reaction with a reaction activation energy of 195.75 kJ/mol,and the reaction rate constant of the TiAl_(3) phase was larger as the Ti/Al interface was bonded with fresh surfaces.At the second stage,the growth was governed by diffusion,the diffusion activation energy was 33.69 kJ/mol,and the diffusion growth rate constant of the TiAl_(3) phase was mainly determined by the grain boundary diffusion owing to the smaller TiAl_(3) grain size. 展开更多
关键词 Ti/Al laminated composites ANNEALING growth kinetics TiAl3 phase formation mechanism
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Mechanism of Ag_3Sn grain growth in Ag/Sn transient liquid phase soldering
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作者 Hua-kai SHAO Ai-ping WU +2 位作者 Yu-dian BAO Yue ZHAO Gui-sheng ZOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第3期722-732,共11页
Transient liquid phase(TLP)bonding is a potential high-temperature(HT)electron packaging technology that is used inthe interconnection of wide band-gap semiconductors.This study focused on the mechanism of intermetall... Transient liquid phase(TLP)bonding is a potential high-temperature(HT)electron packaging technology that is used inthe interconnection of wide band-gap semiconductors.This study focused on the mechanism of intermetallic compounds(IMCs)evolution in Ag/Sn TLP soldering at different temperatures.Experimental results indicated that morphologies of Ag3Sn grains mainlywere scallop-type,and some other shapes such as prism,needle,hollow column,sheet and wire of Ag3Sn grains were also observed,which was resulted from their anisotropic growths.However,the scallop-type Ag3Sn layer turned into more planar with prolongingsoldering time,due to grain coarsening and anisotropic mass flow of Ag atoms from substrate.Furthermore,a great amount ofnano-Ag3Sn particles were found on the surfaces of Ag3Sn grains,which were formed in Ag-rich areas of the molten Sn and adsorbedby the Ag3Sn grains during solidification process.Growth kinetics of the Ag3Sn IMCs in TLP soldering followed a parabolicrelationship with soldering time,and the growth rate constants of250,280and320°C were calculated as5.83×10-15m2/s,7.83×10-15m2/s and2.83×10-14m2/s,respectively.Accordingly,the activation energy of the reaction was estimated about58.89kJ/mol. 展开更多
关键词 transient liquid phase soldering Ag3Sn morphologies of grains growth kinetics activation energy
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Metallurgical microstructure control in metal-silicon reactions 被引量:3
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作者 TU KingNing TANG Wei 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第3期505-519,共15页
A comprehensive review on interfacial reactions to form silicides between metal and Si nanowire or wafer is given.Formation of silicide contacts on Si wafers or Si nanowires is a building block needed in making curren... A comprehensive review on interfacial reactions to form silicides between metal and Si nanowire or wafer is given.Formation of silicide contacts on Si wafers or Si nanowires is a building block needed in making current-based Si devices.Thus,the microstructure control of silicide formation on the basis of kinetics of nucleation and growth has relevant applications in microelectronic technology.Repeating events of homogeneous nucleation of epitaxial silicides of Ni and Co on Si in atomic layer reaction is presented.The chemical effort on intrinsic diffusivities in diffusion-controlled layer-typed intermetallic compound growth of Ni2Si is analyzed. 展开更多
关键词 NUCLEATION atomic layer reaction nano-gap intermetallic compound Wagner diffusivity
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