Continuous aluminium oxide base ceramic fibre preparation method

Abstract

The invention provides a method for preparing a continuous alumina-based ceramic fiber, which relates to an alumina-based ceramic fiber, in particular to a method for preparing a continuous alumina-based ceramic fiber which takes alumina as a main component and adds a second component as a crystalling phase inhibitor. The invention provides a method for preparing the continuous alumina-based ceramic fiber, which is simple in technique and low in cost. The method comprises the steps: preparing alumina sol; preparing silicon dioxide sol; mixing the alumina sol and the silicon dioxide sol to obtain biphase sol, and adding a spinning addition agent into the biphase sol; condensing the biphase sol added with the addition agent and spinning by a dry method to obtain the gel fiber; pyrolyzing the gel fiber to obtain the ceramic fiber; and sintering the ceramic fiber to obtain the continuous alumina-based ceramic fiber.

Description

technical field

[0001] The invention relates to an alumina-based ceramic fiber, in particular to a preparation method for a continuous alumina-based ceramic fiber which takes alumina as the main component and adds a second component as a crystal phase inhibitor. Background technique

[0002] Alumina (Al 2 o 3 ) based ceramic fiber with Al 2 o 3 As the main component, its content is generally greater than 70%, and some also contain other metal oxides (such as SiO 2 ), in the form of long fiber, short fiber, etc., is a high-performance inorganic fiber. The outstanding advantages of alumina fiber are high strength, high modulus, heat resistance and high temperature oxidation resistance. Compared with carbon fiber and metal fiber, its surface activity is good, it is easy to compound with metal and ceramic matrix, not only can maintain good tensile strength in high temperature oxidative environment, but also compared with other high-performance inorganic fibers such as silic...

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