The Research On Metal Oxides Doping Modification Of SiO₂-Al₂O₃-CaO-MgO High Strength Glass Fiber

Since1938, Owens Coming invented Non-alkali E glass fiber, and created an age of glass fiber reinforced composites. Based on its high strength, high modulus, high heat resistance and high corrosion resistance, high strength glass fiber can be used in aerospace, aviation, weapons, ship and chemical industry and so on. While the defect is that the forming temperature is high, the drawing technology is hard, and production cost is high. In our country, many high performance glass fibers still need to be imported. So the researches on high performance glass fibers are still the main direction of long-term development of high strength glass fiber.The purpose of this study is to do some basic researches for developing high strength glass fiber. According to the literature search results, three kinds of metal oxide, CeO2, TiO2and ZrO2, were selected as the research objects in this paper. In this paper, the effects of different oxides on the high strength glass fiber were researched through the performance tests. And the significance of the study is to provide the theoretical guidance and data support for the development of new high strength glass fiber. According to the results of this study it could be concluded that different modified oxides added into the high strength glass fiber components would affect the property of process and usability.Results showed appropriate CeO2would improve the tensile strength of SiO2-Al2O3-CaO-MgO glass fiber. When the content of CeO2is low, CeO2plays a role of "accumulation" and strengthens the glass network structure and stability. At the same time it also improves the density of the glasswork, dielectric properties and chemical stability. When the content of CeO2is high, it breaks the glass network structure. The CeO2optimum doping content is from0.5wt%to1wt%.Results showed appropriate TiO2would improve the dielectric properties of SiO2-Al2O3-CaO-MgO glass. When the content of TiO2is low, Ti4+enters the glass network in form of [TiO4] and strengthens the glass network structure. At the same time it also improves the density of the glasswork, tensile strength and chemical stability. The extreme unstability of Ti4+is significant when TiO2is increased. Glass network structure firstly increases then decreases by doping TiO2. The TiO2optimum doping content is about0.75wt%.Results showed appropriate ZrO2can be combined with the silica group in silicate glass structure to get into the glass network. It will enhance the strength of glass network structure to some extent. The results of the experiments show us that1wt%is an appropriate introducing quantity. With this amount of introduction the strength of the glass structure will be enhanced. At the same time, it caused some decrease of other properties. The TiO2optimum doping content is from0.75wt%to lwt%.