全文获取类型
收费全文 | 220篇 |
免费 | 45篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 6篇 |
综合类 | 7篇 |
化学工业 | 60篇 |
金属工艺 | 53篇 |
机械仪表 | 1篇 |
建筑科学 | 1篇 |
矿业工程 | 22篇 |
能源动力 | 1篇 |
石油天然气 | 2篇 |
武器工业 | 1篇 |
无线电 | 4篇 |
一般工业技术 | 21篇 |
冶金工业 | 91篇 |
原子能技术 | 3篇 |
自动化技术 | 1篇 |
出版年
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 6篇 |
2020年 | 14篇 |
2019年 | 8篇 |
2018年 | 9篇 |
2017年 | 11篇 |
2016年 | 9篇 |
2015年 | 8篇 |
2014年 | 12篇 |
2013年 | 13篇 |
2012年 | 15篇 |
2011年 | 19篇 |
2010年 | 11篇 |
2009年 | 6篇 |
2008年 | 6篇 |
2007年 | 11篇 |
2006年 | 10篇 |
2005年 | 15篇 |
2004年 | 19篇 |
2003年 | 9篇 |
2002年 | 8篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 10篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1985年 | 2篇 |
排序方式: 共有274条查询结果,搜索用时 0 毫秒
1.
2.
3.
含钪Al-Cu合金的显微组织 总被引:4,自引:0,他引:4
采用硬度测试、金相观察、扫描电镜和透射电镜测试及能谱分析的方法,研究了稀土元素Sc含量对Al-4Cu合金组织的影响.结果表明:Sc可显著细化Al-Cu合金的网胞组织,减小枝晶间距,细化合金的晶粒组织,提高合金的显微硬度,提高幅度最约70%;将Sc添加到Al-4Cu合金中,当w(Sc)≈0.3%时,Sc除部分固溶于基体外,大部分与Al形成Al3Sc相,其与基体的共格或半共格界面促进了θ′(CuAl2)的析出;当w(Sc)>0.3%时,Sc除部分固溶和形成Al3Sc外,还与Al、Cu元素作用形成W(AlCuSc)相,降低Cu在α(Al)中的固溶度,减少Al2Cu(θ′)相的生成,从而降低了合金的性能. 相似文献
4.
5.
6.
从赤泥中回收钪的研究现状 总被引:5,自引:0,他引:5
简要介绍了钪的资源分布、主要用途及从赤泥中回收钪的途径,指出了从工业废渣赤泥中回收钪的发展前景。 相似文献
7.
A.-A. Bogno J. Valloton H. Henein D. G. Ivey A. J. Locock M. Gallerneault 《Canadian Metallurgical Quarterly》2018,57(2):148-159
This work addresses the microstructures and mechanical properties of Al-4.5 wt-% Cu alloys containing 0.1, 0.2 and 0.4 wt-% Sc that were solidified under low cooling rate conditions (0.01, 0.08, 0.3 and 0.8°C s?1) and then heat treated. The solidification and heat treatment processes were carried out in a differential scanning calorimeter. Two different approaches were used for heat treatment. The first approach, involved the traditional heat treatment sequences including solutionising for 18.5 h at 535°C then quenching, followed by aging at 240°C for 2 h. The second approach consisted of direct aging of the as-solidified samples. Under low solidification rate conditions, Sc is found to modify the grain morphology from elongated dendrites to equiaxed structures but is neither a grain refiner nor a strengthener. Indeed, much of it is tied up with Cu in the form of the intermetallic W-phase. Consequently, there appears to be no benefit to adding Sc, in the hypoeutectic composition, to Al-4.5 wt-% Cu if the traditional heat treatment route is followed. However, a minor improvement in hardness is observed upon aging immediately after solidification when 0.4 wt-% Sc is added, owing to excess Sc dissolved in the matrix and not precipitating as the W-phase. 相似文献
8.
High‐performance polymer‐supported extractants with phosphonate ligands for scandium(III) separation
下载免费PDF全文
![点击此处可从《American Institute of Chemical Engineers》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Hongmin Cui Ji Chen Hailian Li Dan Zou Yu Liu Yuefeng Deng 《American Institute of Chemical Engineers》2016,62(7):2479-2489
As the market demand for scandium has grown, a great deal of interest has been generated in its recovery. To substantially simplify the process and provide a green alternative for scandium separation, novel polymer‐supported extractants containing di(2‐ethylhexyl) phosphonate and bis(2,4,4‐trimethylpentyl) phosphonate, [D201][DEHP] and [D201][C272] are proposed because they demonstrate improved adsorption capacity and selectivity toward scandium(III). Scandium(III) adsorption is significantly affected by the solution pH, with the maximum adsorption occurring at a pH of approximately 0.78. The batch adsorption data fit well with the Langmuir isotherm and pseudo‐second‐order kinetic models. A combination of the Fourier transform infrared and XPS spectra suggest that the complexation of oxygen atoms in phosphate groups with scandium(III) is the predominant adsorption mechanism. Additionally, the two resins were used to recover scandium from leaching liquor of nickel laterite ore. [D201][DEHP] exhibits unusual selectivity for scandium and low competitive behavior with other metals, thus increasing its market potential. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2479–2489, 2016 相似文献
9.
研究了在赤泥-钛白废酸浸出液中微量钪(Ⅲ)的测定,采用铬天青S作显色剂,考察了反应条件对检测结果的影响,确定了酸浸液中钪的最佳检测条件。实验结果表明,有色溶液的最大吸收波长为615nm,表观摩尔吸光系数为1.57×105L·mol-1·cm-1。钪(Ⅲ)的质量浓度在0~14 g/50mL范围内符合比耳定律,分光光度法应用于赤泥-钛白废酸浸出液中微量钪的测定,结果满意。 相似文献
10.