全文获取类型
收费全文 | 192篇 |
免费 | 17篇 |
国内免费 | 8篇 |
专业分类
电工技术 | 13篇 |
综合类 | 10篇 |
化学工业 | 65篇 |
金属工艺 | 72篇 |
机械仪表 | 9篇 |
建筑科学 | 2篇 |
矿业工程 | 3篇 |
能源动力 | 3篇 |
轻工业 | 4篇 |
石油天然气 | 4篇 |
无线电 | 3篇 |
一般工业技术 | 23篇 |
冶金工业 | 1篇 |
原子能技术 | 1篇 |
自动化技术 | 4篇 |
出版年
2023年 | 6篇 |
2022年 | 8篇 |
2021年 | 9篇 |
2020年 | 16篇 |
2019年 | 9篇 |
2018年 | 13篇 |
2017年 | 8篇 |
2016年 | 7篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 10篇 |
2012年 | 7篇 |
2011年 | 11篇 |
2010年 | 9篇 |
2009年 | 14篇 |
2008年 | 10篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 8篇 |
2004年 | 10篇 |
2003年 | 7篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 7篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有217条查询结果,搜索用时 15 毫秒
211.
在高性能时间测量系统中,高性能时间数字转换芯片只能通过JTAG进行初始化和控制,为此选择了TBC控制器来实现的方法.介绍了TBC控制器对该转换芯片配置的方案,并详述了该方案的软件编程. 相似文献
212.
《Journal of the European Ceramic Society》2023,43(8):3694-3703
Wetting of thermal barrier coatings (TBCs) with calcium-magnesium- alumino-silicate (CMAS) leads to sintering and phase transition, which are major issues in the aerospace industry. We prepared Sr(Zr1−2xYbxGdx)O3−x (x = 0, 0.05, 0.1, and 0.15) coatings using solution precursor plasma spraying with inter-pass boundaries (IPBs) and vertical cracks, and analyzed the CMAS wettability at 1350 °C using the sessile-drop method. The wetting and diffusion dynamics of the CMAS melt on the surface of the coating were studied using a CCD camera, revealing that the Sr(Zr0.7Yb0.15Gd0.15)O2.85 coating had the lowest spreading speed (2.60 × 10−4 mm/s, spreading balance process). Furthermore, a greater extent of crack bending and smaller crack diameter can prevent the coatings from penetration of the CMAS melt. 相似文献
213.
《Ceramics International》2023,49(2):2157-2166
Plasma spray physical vapor deposition (PS-PVD) is a technology that combines the advantages of traditional atmospheric plasma spraying (APS) and electron beam physical vapor deposition (EB-PVD). As the feedstock of the PS-PVD, nano-agglomerated powder is critical on determining the microstructure of the obtained coating. In this study, a method to characterize the cohesion of nano-agglomerated powders was investigated. The nano-agglomerated powders fractured into smaller particles under ultrasonic waves. Their particle size distributions were measured to quantitatively compare their cohesiveness. The change rate in the percentage of powders with particle size less than 5 μm was selected as the value for the cohesion comparison. A high change rate corresponded to a faster fracture and lower powder cohesion. Furthermore, the fracture behavior and heat and mass transfer process of nano-agglomerated powders in the plasma torch were studied by combining 3-D simulation and observation of the microstructures of PS-PVD coatings sprayed with different powders. To obtain a quasi-columnar coating, the nano-agglomerated powder required high cohesion. Finally, a suitable powder was selected and quasi-columnar structure coatings were obtained by optimizing the PS-PVD parameters. 相似文献
214.
《Journal of the European Ceramic Society》2023,43(9):4146-4152
Sintering-induced increases in the elastic modulus and thermal conductivity of thermally sprayed Thermal Barrier Coatings (TBCs) under constraint by a bond-coated substrate due to thermal gradient exposure have been measured. The results suggest the degree of sintering due to this constrained thermal exposure to be significantly lower when compared to free standing exposed specimens. Overall, a ∼30% increase in elastic modulus and ∼12% increase in thermal conductivity have been measured in a ∼ 450 µm thick TBC after 12 h of gradient exposure. Here, the top surface of the TBC was kept at 1250 °C, and the gradient was determined based on a constant backside cooling air flow rate. The elastic modulus, measured across the thickness of coating, reveals that in the region near the top surface, the elastic modulus increased by ∼ 50%. Contrastingly, no significant increase in elastic modulus was observed near the metal/coating interface. The dynamic evolution of thermal conductivity and sintering under gradient exposure and constraint was calculated using an analytical model which was then used to rationalize the experimental observations. 相似文献
215.
为了减少氧气在大气等离子喷涂热障涂层(TBC)中的渗透通道,进而提高涂层抗高温氧化性能。采用溶胶凝-胶法制备Al2O3封孔剂,通过1100 ℃高温氧化试验,研究封孔作用对陶瓷层中氧气传输、TBC微观形貌以及热生长氧化物(TGO)生长行为的影响规律,阐明封孔对提高TBC抗高温氧化性能的作用机理。结果表明:Al2O3封孔有效阻碍了陶瓷层氧气的渗透,降低了TBC的氧化速率。直至氧化100 h,通过封孔的TBC始终具有更小的TGO厚度与氧化增重,而且抛物线氧化速率(Kp)相比传统TBC下降了14.99 %。 相似文献
216.
217.