首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2323篇
  免费   240篇
  国内免费   530篇
电工技术   3篇
综合类   109篇
化学工业   82篇
金属工艺   1607篇
机械仪表   149篇
建筑科学   3篇
矿业工程   19篇
能源动力   82篇
水利工程   1篇
石油天然气   32篇
武器工业   25篇
无线电   38篇
一般工业技术   665篇
冶金工业   266篇
原子能技术   3篇
自动化技术   9篇
  2024年   17篇
  2023年   89篇
  2022年   133篇
  2021年   147篇
  2020年   101篇
  2019年   110篇
  2018年   131篇
  2017年   116篇
  2016年   81篇
  2015年   100篇
  2014年   115篇
  2013年   153篇
  2012年   181篇
  2011年   174篇
  2010年   104篇
  2009年   123篇
  2008年   101篇
  2007年   117篇
  2006年   154篇
  2005年   91篇
  2004年   86篇
  2003年   89篇
  2002年   96篇
  2001年   68篇
  2000年   41篇
  1999年   59篇
  1998年   51篇
  1997年   35篇
  1996年   46篇
  1995年   25篇
  1994年   27篇
  1993年   38篇
  1992年   22篇
  1991年   13篇
  1990年   22篇
  1989年   18篇
  1988年   10篇
  1987年   2篇
  1986年   1篇
  1984年   2篇
  1982年   1篇
  1981年   3篇
排序方式: 共有3093条查询结果,搜索用时 303 毫秒
31.
Evaluation of the superplastic formability of SP-inconel 718 superalloy   总被引:3,自引:0,他引:3  
The superplastic formability of SP- lnconel 718 superalloy was evaluated using the argon blowing method. Relationships among superplastic forming parameters (forming temperature, argon pressure, and forming time) and specific dome height (dome height/workpiece diameter) were investigated, as were changes in material properties after superplastic forming. Experimental results showed the optimum forming temperature range for SP- lnconel 718 to be between 975 and 995 °C. During the superplastic forming process, 5- phase precipitates formed at grain boundaries and limited the grain growth, which is considered beneficial for superplastic deformation. On the other hand, increasing the forming deformation also increased the formation of cavities, which can be attributed to the existence of niobium- rich inclusions. This degraded the superplasticity of the superalloy. Electrochemical tests showed that the corrosion resistance of SP- lnconel 718 after superplastic forming worsened because of the existence of both S- phase precipitates and niobium- rich inclusions.  相似文献   
32.
采用新研制的超高梯度定向凝固装置,研究了不同凝固速率下定向凝固高温合金DZ22枝晶臂间距和枝晶偏析。结果表明,冷运速率增大,枝晶臂间距显著细化,枝晶偏析被强烈抑制。当冷运速率为52.4K.s^-1时,一次、二次枝晶臂间距λ1和λ2分别为28.8和8.4μm,Nb,Ti,Al,Cr,Co,W等元素的偏析比均趋近于1。  相似文献   
33.
利用分形物理分析的方法定量地描述了定向凝固过程中MC型碳化物的生长形态发现随着凝固速率的增加,MC由宽大的枝叶状演化为三级分支的枝簇状,其信息维数随凝固速率呈指数规律上升,并结合非平衡热力学分析了在改变外界控制参数时MC型碳化物形态变化的物理机制  相似文献   
34.
The γ lattice mismatch of specimens of the monocrystalline nickel-base superalloy SRR 99 has been measured by a high-resolution X-ray diffraction technique for the undeformed state and after high-tem-perature creep deformation. During creep deformation beyond the minimum creep rate (total strain =0.5%), the lattice mismatches, measured in and perpendicular to the [001] stress axis, respectively, un-dergo changes in opposite directions. This reflects the buildup of a complex deformation-induced triaxial state of internal stress in the phases y and γ. The overall resolved shear stresses that act in γ and y due to the combined action of the external and internal stresses are estimated, and the conditions under which cutting of the γ phase by dislocations should occur are discussed.  相似文献   
35.
Effects of the hot-isostatic pressing (HIP) process on microstructures and mechanical properties of Ni-base single crystal superalloy CMSX-4 were investigated. In the overall heat treatment process, the HIP treatment remarkably induced the healing behavior of micropores and decreased the pore size and porosity of superalloy CMSX-4 compared with normally treated specimens. The microstructure of γ′ phase after the HIP process showed rather a coarsening tendency and could be developed by the partially solution and aging treatment. Consequently, the elimination of cast micropores using the HIP step resulted in the inhibition of crack initiation in microstructure and improved the stress-rupture lives of Ni-base single crystal superalloy by 185%.  相似文献   
36.
阎光宗  彭志方 《金属学报》2005,41(4):363-368
根据已知镍基合金成分和γ′相成分,运用分层宽容多目标优化法,分别计算了γ相成分及γ′相含量.优化测算过程的实现是通过建立使杠杆定律等式两端数值差最小和两相共格错配度最小的目标函数,并通过设置γ′相含量和基体相成分取值范围的约束条件而实现的.验证了该方法的可行性和准确性.  相似文献   
37.
IntroductionSLlperalloyandheat-resistingsteelarenowwidelyusedasstructurematerialsinaerospace,a\-lationalldshipbuildingindustries.Nickel-basesuperalloywasfirstlyrevealedasanengineeringmaterialduringtheearly1960swhenitwasrecognizedasbeingsuitableforllledium-temperaturegasturbinel'l.Now.nickel-basesuperalloyhasbeenpracticallyusedinhigheffectiveturbinestosatisfytheincreasingdemandsforhighertemperatureenvironmentsIZI.Insomeaerospaceengines,theimpellersshouldserveattemperatureof1000C~1100C,andala…  相似文献   
38.
This paper deals with an experimental investigation concerning steam reforming of methanol at 280, 340 and 380 °C over NiAl and Ni (Au, Rh or Ir)Al layered double hydroxides (LDHs) derived catalysts. Incorporation of noble metal ions into the NiAl-LDH framework was evidenced by XRD, TGA and TEM techniques. High selectivity to H2 and CO2 with less than 5% (volume) CO and trace CH4 was observed over the NiAl-LDH catalyst. Whereas CO and H2 are major products at lower temperatures after addition of Au, Rh and Ir to the NiAl-LDH system. They are significantly reduced with the concomitant increase in CH4 and CO2 as the temperature increased.  相似文献   
39.
Copolymerization of -norbornenyl polystyrene macromonomer (NBE-PS) with norbornene (NBE) using Ni-based catalysts in combination with methylaluminoxane (MAO) was investigated. The nature of the catalyst, the of the polystyrene macromonomer as well as the [NBE-PS]/[NBE] ratio have been shown to be important parameters to obtain graft copolymers with high NBE-PS incorporation (up to 43 wt%). The compatibilization ability of these graft copolymers has been checked for PS/PNBE blends. The length of the grafts was proved not to be an important parameter to consider compatibilization of the PS/PNBE blend.  相似文献   
40.
采用有限元软件对高温合金IN690管材挤压损伤进行预测,研究挤压速度对损伤的影响规律,得到不同的挤压条件下的挤压阈值。不同挤压速度下损伤的变化随着挤压速度变化呈现先增大后减小的趋势。模拟摩擦系数为0.01、0.05、0.1、0.2条件下的损伤,在摩擦系数为0.01时,坯料表面比较光滑,损伤比较轻;摩擦系数为0.2时,表面凹凸不平,损伤严重。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号