共查询到19条相似文献,搜索用时 140 毫秒
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水基改性碳化硅陶瓷料浆流变性的研究 总被引:7,自引:0,他引:7
用有机硅偶联剂处理SiC粉体,在适合的上,经聚合反应再将有机的单体接枝于SiC颗粒表面上,在SiC颗粒表面上形成聚电解质包覆层,以改善SiC粒子在水介质中的分散性质。同时研究了改性SiC粉在水介质中的稳定条件,荷电性及在高固体含量下,用改性SiC粉所制备的陶瓷料浆的流变性。研究结果表明:改性后碳化硅粉在水中的分散稳定性能大大优于未改性碳化硅粉,所制备料浆体系的固体含量,分散稳定性能,粘度等参数有满足注浆成型工艺的要求。 相似文献
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硅烷偶联剂对碳化硅粉体的表面改性 总被引:2,自引:0,他引:2
采用KH-550硅烷偶联剂对SiC粉体表面进行改性,得到了改性最佳工艺参数,分析了表面改性对SiC浆料分散稳定性的影响.结果表明:SiC微粉经硅烷偶联剂处理后没有改变原始SiC微粉的物相结构,只改变了其在水中的胶体性质;减少了微粉团聚现象.与原始SiC微粉相比,改性SiC微粉表面特性发生了明显变化,Zeta电位绝对值提... 相似文献
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微米、纳米SiC表面涂覆、改性的方法及研究现状 总被引:3,自引:0,他引:3
介绍了微米、纳米SiC表面涂覆、改性的实验方法,探讨了各种方法的特点.从微米、纳米SiC的三种不同形态入手,详细介绍了微米、纳米SiC的表面涂覆、改性的研究进展,并对微米、纳米SiC表面涂覆、改性技术给出了简要评价. 相似文献
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有机硅改性丙烯酸酯树脂的研究进展 总被引:4,自引:0,他引:4
详细介绍了有机硅改性丙烯酸酯的方法。目前主要有物理混合和化学改性两类改性方法,其中以化学改性的效果较好。在化学改性法中,硅氢加成法的反应条件温和、产率高,被广泛用于合成各种高性能的含硅高聚物,有着广阔的发展前景。 相似文献
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Junjie Duan Menghang Zhang Pengju Chen Zhuan Li Liang Pang Peng Xiao Yang Li 《Ceramics International》2021,47(14):19271-19281
Due to the favorable tribological, mechanical, chemical, and thermal properties, carbon fiber reinforced ceramic composites, especially carbon fiber reinforced carbon and silicon carbide dual matrix composites (C/C–SiC), has been considered as high-performance frictional materials. In this paper, current applications and recent progress on tribological behavior of C/C–SiC composites are reviewed. The factors affecting the friction and wear properties, including the content of silicon carbide and carbon matrix, carbon fiber preform architecture, as well as the matrix modification by alloy additives and C/C–SiC composites under various test conditions are reviewed. Furthermore, based on the current status of researches, prospect of several technically available solutions for low-cost manufacturing C/C–SiC composites is also proposed. 相似文献
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块状硅土矿是一种由隐晶质石英组成的松软硅质岩,通过气流粉碎与表面改性制备出的活性超细石英粉是一种优质的橡塑填料。 相似文献
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室温硫化硅橡胶胶粘剂粘接增强改性研究进展 总被引:1,自引:1,他引:1
室温硫化(RTV)硅橡胶胶粘剂具有很多优异的性能,因而在电子电器、汽车、机械、建筑和医疗等行业中得到广泛应用。但由于其对各种基材的粘接性能较差,因此对其进行粘接改性的研究很多,主要包括交联剂、聚硅氧烷物理化学增强和粘接面的表面处理等方面的改性研究。从交联剂的选择、树脂的增强改性和粘接面的表面处理方面综述了RTV硅橡胶胶粘剂的增强改性机理和国内外的研究进展,并提出了未来的研究方向。 相似文献
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木质素来源丰富,理化特性优良,将其改性后做为絮凝剂,具有充分利用资源和高效治理废水的双重意义.对木质素的性质、提取方式、改性方法及絮凝剂效果进行了探讨,认为木质素类絮凝剂的研究及利用具有很好的经济效益和发展前景. 相似文献
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先驱体法制备含异质元素SiC陶瓷纤维的现状与进展 总被引:9,自引:6,他引:9
先驱体聚碳硅烷进行物理与化学改性,可以制备出各种含Ti,Zr,Al,B等异质元素的耐温型和吸波型SiC陶瓷纤维。含异质元素的SiC陶瓷纤维,已成为当今SiC陶瓷纤维的发展主流,着承介绍了Si-C、O,Si-Ti、C-O,Si-B-Ti-C,Si-Zr-C-O,Si-Al-C纤维的先驱体的制备及其纤维的性能。介绍了我国含异质元素SiC纤维的现状与进展,指出国内SiC纤维的发展要立足于创新的基础上开发各种高性能SiC纤维,力争做到高起点、高瞻远瞩地发展新型SiC纤维,建立拥有自主知识产权的制备工艺。 相似文献
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Small graphite-like boron nitride inclusions have been detected, using transmission electron microscopy, in silicon nitride particulate-reinforced silicon carbide composites hot isostatically pressed in tantalum cans. The inclusions are thought to arise indirectly from fine particles of boron nitride sprayed onto the internal surface of the tantalum can to prevent a chemical reaction between the tantalum and the silicon carbide. Boron oxide present on the surface of these particles is able to evaporate and penetrate the powder compacts during hot isostatic pressing and then react with silicon nitride and silicon carbide to form the observed inclusions. 相似文献
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《Ceramics International》2021,47(18):25551-25557
Silicon carbide surface modification is still a challenging task. Its modification mechanism is also still unclear. This paper provides a study of the surface modification mechanism of KH5X0 (X = 5, 6, 7, 8, 9) on the silicon carbide (111) using density functional theory. The electronic structures and densities of states of KH5X0 (X = 5, 6, 7, 8, 9) on SiC surfaces indicates that the surface modification mechanism is attributed to the electronic effects of the functional groups of KH5X0 (X = 5, 6, 7, 8, 9). From the results the easier it is for a functional group to obtain electrons, the better the modifying performance of silane coupling agent will be. Furthermore, the interface energy results showed that silicon carbide (111) modification performance by KH580 silane and KH590 silane is better than KH550, KH560, and KH570. The present work provides theoretical guidance for the fabrication of SiC heat sink products. 相似文献