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粘结NdFeB磁体用偶联剂 谢凯1,雷廷权2,韩晓静1,夏立芳2,许根生3,赵恂1,白书欣1,舒阳会3,张虹1 (1.国防科技大学材料科学与应用化学系,;2.哈尔滨工业大学,;3.中国航天磁材器件生产技术中心,) 摘要:粘结NdFeB的制备工艺中磁粉的表面预处理是非常重要的,选用钛酸酯与硅烷偶联剂进行了对比实验.结果表明,经钛酸酯处理过的磁体磁性能较高,用硅烷处理过的磁体抗压强度较高.对它们的作用机理进行了分析. 关键词:粘结NdFeB; 磁粉; 偶联剂; [全文内容正在添加中] ......
α-Fe金属磁记录粉表面化学改性 宋宝珍1,王其祥1,李洪钟1 (1.中国科学院过程工程研究所,北京100080) 摘要:金属磁记录粉表面包覆硅烷偶联剂(KH550)可以明显改善其氧化稳定性.采用TEM,FT-IR,TG-DSC,Mossbauer,EXAFS以及VSM等分析方法,研究表面有机物结构以及表面吸附有机薄膜对金属粒子本身原子结构的影响.结果表明,有机物分子一方面与粒子表面氧化层发生较强的化学键合作用形成Si-O-Fe,表面有机物薄膜影响粒子表面Fe原子,电子状态;对粒子基体中Fe原子的第二近邻结构具有明显的影响,而对第一近邻结构没有影响. 关键词:金属磁记录粉; 硅烷偶联剂......
="ChDivSummary" name="ChDivSummary">The influence of acetic acid on dynamic behavior of hydrolazation and film forming of an expoxy-silane compound (γ-GPS ) was investigated by conductivity meter, IR and AFM. The experimental results show that there is an optimal pH value(pH=4-5) for hydrolysis of silane solution, and with the prolongation of hydrolytic time, the promotion of acetic acid on the hydrolyzation......
, China; 2. State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China) Abstract: A solvent-extracting technique was proposed to prepare self-assembled monolayers of silane... photoelectron spectroscopy. The experimental results show that solvent- extractions with non-polar and polar solvents in inert gas atmosphere remove effectively the physiosorbed silane molecules......
by silylation between 3-methacryloxypropyltrimethoxyl silane(MPS) and silica’s surface hydroxyl groups. The freshly formed silica nanoparticles in flame were continuously functionalized by a fine spray of 3-methacryloxypropyltrimethoxyl silane(MPS) solution at a preferred temperature. The functionalization extent, morphology structure and size of silica nanoparticles were characterized by transmission......
silane layer exhibited a better anti-corrosion performance, nevertheless, the high concentration of La3+ ion modified was worse. Results showed that the preferable addition concentration of La3+ ion in the silane film was 5×10–4 mol/L in this experiment.关键词:......
(PVC) composites with the variations in additive concentrations of wood flour, silane coupling agent, organomodified montmorillonite (OMMT) and nano-cacium carbonate (nano-CaCO3). Their effects were.... Modification of WF with silane was beneficial to creep resistance, so did adding low ratio of OMMT (1.5 wt%) and nano-CaCO3 in composites. Thus, it was effective in reducing creep either......
-ethylene-butylene-styrene (SEBS-g-MA) and silane. The composites were injection molded and mechanical tests were applied to obtain tensile strength, elastic modulus and impact strength. Antibacterial efficiency test was applied on the injection molded composite plaques by viable cell counting technique. The results showed that the composites including SEBS-g-MA and silane coated TiO2 gave better......
silane layer exhibited a better anti-corrosion performance, nevertheless, the high concentration of La3+ ion modified was worse. Results showed that the preferable addition concentration of La3+ ion in the silane film was 5×10–4 mol/L in this experiment.关键词:......
consists of oxide and hydroxide of Ce(III), and the silane network is composed of the outer layer together with a small amount of Ce(IV) hydroxide. By adding silane and ZrO2 nanoparticles into Ce-based... alternatives, sol–gel derived organosilane films have attract much attention in recent years [8-10]. By immersing the substrate in hydrolyzed alcohol or water based silane solutions, a very dense self......
