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ZrB_2-SiC陶瓷基复合材料抗氧化性能的研究 石晓斌1,宋扬1,张跃2,付景莹2,高栋2 (1.先进功能复合材料技术国防科技重点实验室,北京,100076;2.北京航空航天大学,空天材料与服役教育部重点实验室,北京,100191) 摘要:将C纤维增强不同成分配比的ZrB_2-SiC复相陶瓷在1400 ℃下进行静态抗氧化实验,研究了成分配比及氧化时间对材料氧化过程的影响.通过分析氧化后材料的氧化增重率,氧化试样的背散射电子照片,研究氧化过程中ZrB_2-SiC陶瓷微观结构的变化,在此基础上探讨该温度下材料氧化的微观机制.结果表明,氧化初期形成的玻璃相在试样表面形成了一层有效的保护层,这......
常压烧结制备ZrB_2-SiC复相陶瓷材料 黄政仁1,张辉1,刘学建1,闫永杰1 (1.中国科学院上海硅酸盐研究所,上海,200050;2.中国科学院研究生院,北京,100049) 摘要:以溶胶凝胶法合成的亚微米级和市售微米级ZrB_2粉体为原料,B4C和Mo为烧结助剂,在氩气气氛下,常压烧结制得ZrB_2-SiC复相超高温陶瓷材料.研究结果表明,亚微米级ZrB_2超细粉体的加入对ZrB_2-SiC复相陶瓷的常压烧结致密化有一定的促进作用,但对材料性能的影响不太明显.当超细粉体占到粉体质量的30%时,材料的相对密度约为97%.复相材料的三点抗弯强度为(327±56) MPa,弹性模量为(......
Microstructure of nickel foam/Mg double interpenetrating composites ZHAO Long-zhi(赵龙志)1, 2, 3, ZHAO Ming-juan(赵明娟)2, LI Na(李 娜)2, YAN Hong(闫 洪)1, ZHANG Jin-song(张劲松)4 1. School of Mechanical... of Sciences, Shenyang 110016, China Received 23 September 2009; accepted 30 January 2010 Abstract: The magnesium matrix double interpenetrating composites reinforced by nickel foam were fabricated......
J. Cent. South Univ. (2019) 26: 2569-2577 DOI: https://doi.org/10.1007/s11771-019-4195-3 Reinforcement by polyurethane to stiffness of air-supported fabric formwork for concrete shell construction... weight of concrete and less stiffness of fabric formwork. Polyurethane can be used not only as a bonding layer between fabrics and concrete but also as an additional stiffening layer. However......
The Aging Behavior of Polyurethane Adhesive in Medium倪晓雪University of Science and Technology BeijingWuhan Research Institute of Materials Protection摘 要:The aging behavior of polyurethane adhesive in medium was investigated and compared by means of scanning electronic microscopy(SEM), infrared spectroscopy(IR), interface analysis and shearing strength......
Y, CHO H. Macrocyclic nickel(Ⅱ) complex and hydrophilic polyurethane film electrodes for the electrocatalytic oxidation and selective detection of norepinephrine[J]. Electrochimica Acta, 2004, 49(24...15);NAS在自然条件下放置62 d后,其除铜效果仍然能够满足生产要求,且NAS在除铜过程中没有引入有害离子进入溶液. 关键词:镍电解阳极液;除铜;电子等排原理 中图分类号:TF 811 文献标识码: A Removing copper from nickel electrolyte solution......
Radiation Effect of Neutrons in a Reactor on Polyurethane黄玮Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics摘 要:The radiation effect of neutrons in a reactor on polyurethane was studied.The gases produced by irradiated samples were analyzed by gas chromatography,and the dynamic mechanical and compression properties......
Nickel Electroplating Toru Murakami1,Kazutoshi Komori2,Yasuo Uchikoshiki3 (1.C. Uyemura. & Co.,Ltd. ,Osaka, Japan;2.Uyemura(Shanghai;3.Uyemura-Solar(Shenzhen) 摘要:Nickel electroplating has been... use. At first the basics of nickel electroplating, for example, purpose, use, merit & demerit, nickel plating solution, current efficiency,limiting current density, additional agents and their behaviors......
surface of the nickel foams, the original polyurethane foams always need to stretch to a certain extent during the progress of production before they are produced into nickel foams. By specific method... analyzed. 2 Experimental The specimens used in this experiment were open-cell nickel foams, which were electro-deposited on the surface of the polyurethane foams at first. Then, a suitable heat treatment......
attention to. The latter is generated by the engagement impacts of the rotating key on the spline bush. In order to absorb the pressing energy and reduce the noise radiated, polyurethane cushions were... of polyurethane go beyond its critical application temperature, using the finite element method. According to the characteristic that the deforming memory alloy can restore the remembered shape......