全文获取类型
收费全文 | 52篇 |
免费 | 2篇 |
国内免费 | 10篇 |
专业分类
综合类 | 4篇 |
化学工业 | 2篇 |
金属工艺 | 34篇 |
机械仪表 | 1篇 |
矿业工程 | 5篇 |
一般工业技术 | 11篇 |
冶金工业 | 6篇 |
自动化技术 | 1篇 |
出版年
2020年 | 1篇 |
2018年 | 2篇 |
2016年 | 1篇 |
2012年 | 2篇 |
2011年 | 1篇 |
2010年 | 5篇 |
2008年 | 2篇 |
2007年 | 6篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 13篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 2篇 |
排序方式: 共有64条查询结果,搜索用时 15 毫秒
21.
A thermodynamic assessment of the Cu-Cd system has been carried out by CALPHAD technique.The liquid phase, FCC_A1(Cu)and HCP_A3(Cd)terminal phases are described by a simple substitutional model,their excess Gibbs energy is formulated with the Redlich-Kister expression.The system contains four intermediate compounds,includingβ(Cu2Cd),γ(Cu4Cd3), δ(Cu5Cd8)andε(Cu3Cd10).Theδphase is described by a two-sublattice model and the other three intermediate phases are treated as stoichiometric phases.The optimization is carried out in the Thermo-Calc package.A set of self-consistent thermodynamic parameters are obtained.The calculated phase diagram and thermodynamic properties agree well with the available experimental data. 相似文献
22.
23.
1 INTRODUCTIONChemicalvapordeposition (CVD)diamondholdsgreatpromiseinsolvingthermalmanagementprobleminhigh performancemulti chipmodules (MCMs) .However ,thismaterialdoespresentsometechnologi calchallenges ,onebeingthedevelopmentofreliablemetallizationsystems[1] .Thedesirablecharacteristicsofametallizationsystemare goodadhesiontothesubstrate ,lowstress ,goodelectricalconductivityandminimalreactionsatsubsequentprocessingtempera tures (upto 4 0 0℃ ) [2 ] .Goldisusuallychosenasthemetalfor… 相似文献
24.
1 INTRODUCTIONBecauseoftheirhighstrength ,goodplasticityandcorrosionresistance ,especiallylowdensityandexcellentfracturetoughness , 相似文献
25.
1 INTRODUCTIONNi Tabinaryalloyhasbeenthesubjectofmuchresearchowingtoacombinationofscientificandtech nologicalinterest .Ononehand ,t 相似文献
26.
Based on the phase diagram of the Fe-Pr system available,the thermodynamic optimization and calcula-tion of the system have been carried out by the least square method.The lattice stabilities of Fe and Pr aredescribed by the expression recommended by SGTE organization.The liquid phase is described by thesubregular solution model.The intermetallic compounds,Fe_(17)Pr_2 and Fe_2Pr,are treated as stoichiometriccompounds.The optimized parameters describing phases in the system are presented.The comparision be-tween the calculated and experimentally determined phase diagram shows that the agreement is generally verygood except for the liquid δ-Fe equilibrium.It is suggested to measure this part of phase diagram again. 相似文献
27.
The purpose of the present paper isto determine the composition range ofthe θ intermediate phase and establishthe phase equilibria relation in theW-Fe-Co ternary system.The experimentalresult was compared with the calculationof phase diagrams in Guillermet's work.1.Experimental ProcedureThe diffusion couple specimen usedin this investigation was prepared fromthe tungsten bar (99.96 wt-%),electro- 相似文献
28.
采用扩散偶试样,借助电子探针、X射线衍射等分析方法,测定了W-Ni-Cu三元系1017℃等温截面。在该温度下,W-Ni二元系存在体心四方结构的Ni_4W和正交结构的NiW,没有观察到NiW_2。钨在Ni_4W中的固溶度范围为16.95—20.51at.-%(39.00—44.70wt-%),Cu在Ni_4W中的固溶度范围为0—4.36at.-%(3.40wt-%).钨在γ(Ni)固溶体中的最大固溶度为13.11at.-% (32.10wt-%). 相似文献
29.
Thermodynamic optimization of Mg-Nd system 总被引:3,自引:0,他引:3
Based on the reported experimental data,the phase diagram of Mg-Nd binary system was optimized using the CALPHADapproach.Gibbs energies of the disordered BCC_A2 and ordered BCC_B2 phases were modeled with a single expression based on a2-sublattice model.Liquid and terminal solutions,such as dHCP and HCP,were modeled as substitutional solutions.Intermediatephases Mg2Nd,Mg3Nd and Mg41Nd5 were treated as stoichiometric compounds.The optimization was carried out in theThermo-Calc package.A set of thermodynamic parameters is obtained.Calculated phase diagram,enthalpies of formation and Gibbsenergies of formation are in reasonable agreement with the experimental data. 相似文献
30.
The isothermal sections of Ni-Cr-Nb ternary system at 1 323 K and 1 423 K were determined by means of diffusion triple and energy spectrum analysis (ESA). By analyzing the diffusion layers in the diffusion couples, the compounds forming in this system were identified. There are three similar compounds found at these two temperatures: Ni3 Nb, NiNb and NbCr2-R, and four similar three-phase regions are found : (Ni) (Cr) Ni3 Nb, Ni3Nb NbCr2-R NiNb, NbCr2-R (Cr) Ni3 Nb, NbCr2-R NiNb (Nb). The results show that no phase transformation happens between these tow temperatures. But the solid solubilities of the binary compounds at 1423 K become bigger than those at 1 323 K, especially the solid solubility of NbCr2-R. No ternary compound is observed. 相似文献