Research progress in preparation of alumina filaments by sol-gel method
The technical research progress in the three stages of sol preparation,fiber forming and high-temperature treatment in the process of preparing alumina(α-Al2O3)filaments by sol-gel method was reviewed.For the sol preparation stage,the raw materials mainly include inorganic aluminum salts and organic alcohol aluminum salts.The research mainly focuses on the influ-ence of factors such as the feed ratio,feeding method,reaction temperature,reaction time and pH value of aluminum sol on the preparation of α-Al2O3 filaments,but is lack of theoretical research on colloids,especially the relationship between colloid prop-erties and fiber morphology and properties.For the fiber forming stage,the spinning method is relatively simple due to the main use of dry spinning technology.For the high temperature treatment stage,the research mainly focuses on the methods of inhibiting the grain growth,controlling the grain size and improving the fiber density.It was suggested to strengthen the research on the in-fluence of each stage on the structure and properties of fibers,as well as the correlation,influencing factors,and mechanism of each stage.
alumina filamentsol gel methoddry spinningtechnical progress
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