共查询到8条相似文献,搜索用时 0 毫秒
1.
2.
3.
4.
光热偏转薄膜热导测试系统及其应用 总被引:2,自引:0,他引:2
根据光热偏转光谱(PTDS)原理,研制成功光热偏转法薄膜热导测试系统,对大量试样进行了测量,结果同文献参考值符合较好,测量重复精度优于50%,为材料科学有关热性质的研究,特别是有关光热偏转薄膜热导率的研究提供了有力的检测手段,为研制高质量金刚石薄膜提供了依据。 相似文献
5.
6.
Titanium and its alloys are currently considered as one of the most important metallic materials used in the biomedical applications, due to their excellent mechanical properties and superior biocompatibility. In the present study, a new effective method for fabricating high porosity titanium alloy scaffolds was developed. Porous Ti-6Al-4V scaffolds are successfully fabricated with porosities ranging from 30% to 70% using spaceholder and powder sintering technique. Based on its acceptable properties, spherical carbamide particles with different diameters (0.56, 0.8, and 1mm) were used as the space-holder material in the present investigation. The Ti-6Al-4V scaffolds porosity is characterized by using scanning electron microscopy. The results show that the scaffolds spherical-shaped pores are depending on the shape, size and distribution of the space-holder particles. This investigation shows that the present new manufacturing technique is promising to fabricate a controlled high porosity and high purity Ti-6Al-4V scaffolds for hard tissue replacement. 相似文献
7.
R. Vignesh Babu Kunwar Avanish Verma M. Charan S. Kanagaraj 《Advanced Powder Technology》2018,29(10):2356-2367
Copper (Cu) gained its importance in several applications due to its attractive thermal characteristics. However, its applications are limited, wherever high strength and high thermal conductivity are desirable. Thus, an attempt was made to develop Cu/CNT composites having the improved mechanical and thermal properties. Initially, Cu/CNT composite powder was synthesized through molecular level mixing technique, where the functionalized 20–40?nm and 40–60?nm diameter CNT with varying concentrations from 0.25 to 1.0?wt.% with an increment of 0.25?wt.% were used. The powder was uniaxially compacted at 800?MPa and sintered in the range of 2–8?hr at 900?°C. The best characteristics of Cu/CNT composites obtained from the present study are as follows: Relative density (RD) – 89.1%, Hardness – 61.2?±?0.58 VHN, Thermal conductivity – 343?W/mK and these characteristics obtained their maximum value at 0.25?wt.% CNT concentration and started to decrease irrespective of CNT diameter. 相似文献
8.
Zheyu Luo Yucun Zhou Xueyu Hu Weining Wang Yong Ding Weilin Zhang Tongtong Li Nicholas Kane Zhijun Liu Meilin Liu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(17):2208064
Reversible solid oxide cells based on proton conductors (P-ReSOCs) have potential to be the most efficient and low-cost option for large-scale energy storage and power generation, holding promise as an enabler for the implementation of intermittent renewable energy technologies and the widespread utilization of hydrogen. Here, the rational design of a new class of hexavalent Mo/W-doped proton-conducting electrolytes with excellent durability while maintaining high conductivity is reported. Specifically, BaMo(W)0.03Ce0.71Yb0.26O3-δ exhibits dramatically enhanced chemical stability against high concentrations of steam and carbon dioxide than the state-of-the-art electrolyte materials while retaining similar ionic conductivity. In addition, P-ReSOCs based on BaW0.03Ce0.71Yb0.26O3-δ demonstrate high peak power densities of 1.54, 1.03, 0.72, and 0.48 W cm−2 at 650, 600, 550, and 500 °C, respectively, in the fuel cell mode. During steam electrolysis, a high current density of 2.28 A cm−2 is achieved at a cell voltage of 1.3 V at 600 °C, and the electrolysis cell can operate stably with no noticeable degradation when exposed to high humidity of 30% H2O at −0.5 A cm−2 and 600 °C for over 300 h. Overall, this work demonstrates the promise of donor doping for obtaining proton conductors with both high conductivity and chemical stability for P-ReSOCs. 相似文献