全文获取类型
收费全文 | 148篇 |
免费 | 1篇 |
国内免费 | 18篇 |
学科分类
工业技术 | 167篇 |
出版年
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 5篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 2篇 |
2011年 | 10篇 |
2010年 | 7篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 14篇 |
2006年 | 19篇 |
2005年 | 15篇 |
2004年 | 15篇 |
2003年 | 6篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1992年 | 2篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1985年 | 1篇 |
排序方式: 共有167条查询结果,搜索用时 640 毫秒
1.
Summary We introduce a very simple model for thermally activated atomic migration on a lattice, and several techniques to handle it. For thermodynamical systems, the model can be used for simulating decomposition paths taking into account relevant metallurgical features. Close to equilibrium, the simplest mean-field approximation of the model can be linearized with respect to the departure from equilibrium; one then gets a microscopic interpretation of classical phenomenological coefficients, such as mobility, interfacial transfer coefficient, rate constants for the coupled relaxation of concentration and order fields. Further away from the equilibrium, the nonlinearities can be taken into account in a consistent way. For driven alloys, i.e. alloys submitted to external forcing, forced atomic migration is added to the model and new features emerge: the model is supported by several experimental results some of which confirmed its predictions a posteriori. 相似文献
2.
MENG Fan-Jun XU Bin-Shi ZHU Sheng MA Shi-Ming ZHANG Wei ZHU Zi-Xin National Key Laboratory for Remanufacturing Beijng China 《材料热处理学报》2004,(5)
Fe-Al intermetallics with remarkable high-temperatureintensity and excellent erosion,high-temperatureoxidation and sulfuration resistance are potential lowcost high-temperature structural material.ProducingFe-Al/WC composite coating by high velocity arcspraying(HVAS)on structural materials would notonly obviate the problems faced in fabrication of thesealloys into useful shapes,but also allow the effectiveuse of their outstanding high-temperature performance,which might thus promisingly mak… 相似文献
3.
Fe-Al/WC intermetallic composite coatings were prepared by high velocity arc spraying (HVAS) technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings was studied. The results demonstrate that the kinetics curve of oxidation approximately follows the logarithmic law and the oxidation velocity of Fe-Al/WC composite coatings is less than that of 20G steel after 5 h. The composition of oxidized coating is mainly composed of Al2O3, Fe2O3, Fe3O4 and FeO. These phases distribute unevenly. The protective Al2O3 film firstly forms and preserves the coatings from further oxidation. 相似文献
4.
The Fe-Al/WC intermetallic composite coatings have been prepared by high velocity arc spraying(HVAS)technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings has been studied by means of thermogrativmetic analyzer. The results demonstrate that the kinetics curve of oxidation approximately follows the logarithmic law. The composition of the oxidized coating surface mainly is composed of Al2O3, Fe2O3, Fe3O4 and FeO which distribute unevenly. The protective Al2O3 film firstly forms and preserves the coatings from further oxidation. 相似文献
5.
针对钢-铝铅半固态复合界面的特点,采用界面铁铝化合物比率对钢-Al-28Pb半固态铸轧复合界面进行了定量研究,并且利用人工神经网络技术建立了界面铁铝化合物比率与复合参数(如钢板预热温度、Al-28Pb半固态浆料固相率、铸轧速度等)之间的关系模型.结果表明:与复合界面最大界面剪切强度相对应的界面铁铝化合物比率为71.5%,也就是说,合理的钢-Al-28Pb半固态铸轧复合界面应由71.5%的铁铝化合物构成. 相似文献
6.
高速电弧喷涂Fe-Al金属间化合物涂层 总被引:4,自引:1,他引:4
采用粉芯丝材和高速电弧喷涂技术(HVAS)制备了Fe-Al金属间化合物涂层,并研究了涂层的显微组织和室温至650℃的滑动摩擦磨损性能.结果表明:Fe-Al涂层的平均成分为Fe-20.0Al-14.1O(摩尔分数,%),主要相是Fe3Al,FeAl,α-Fe,Al2O3及少量Al;涂层具有较高的结合强度和硬度、较低的孔隙率及较高的高温耐磨性;高温下磨损面形成了大面积的氧化物保护层,降低了涂层的摩擦因数,而剥层磨损是涂层的主要磨损机制.涂层中Fe3Al和FeAl金属间化合物相较高的高温强度和硬度能有效地阻碍裂纹的产生、扩展及扁平颗粒的断裂,从而使Fe-Al涂层表现出优异的高温耐磨性. 相似文献
7.
8.
二元Al基粉末扩散反应的研究 总被引:3,自引:0,他引:3
为了研究二元Al基混合粉末的扩散反应,采用粉末冶金方法,利用光镜、扫描电镜和X射线衍射技术研究了Cr-Al、Fe-Al和Cu-Al生坯、烧结体的显微组织和相结构。结果表明,Cr、Fe和Cu粉末与Al粉末经过固相烧结,在粉末颗粒界面处形成扩散反应区域,在扩散反应区域中形成了相应的Cr-Al9、Fe2Al5和Cu9Al4、CuAl金属间化合物,金属间化合物的生成规律与二元扩散偶反应扩散规律密切相关。 相似文献
9.
10.