A containing 1 ~ 5wt% b 2 o 3 Preparation method of alumina-based ceramic continuous fiber

Abstract

The invention provides a preparation method for an aluminum oxide-based ceramic continuous fiber containing 1-5 wt% of B2O3. The method comprises the following steps that alumina sol containing Al13 colloidal particles, a pseudo-boehmite nano-dispersion, silica sol, a boric acid aqueous solution and a high-molecular spinning auxiliary are mixed so as to obtain a mixed solution; then aging and concentrating are carried out until the viscosity of a system is 500-1000 Pa*s so as to obtain spinnable precursor sol; and dry spinning, drying and calcining are carried out so as to obtain the aluminumoxide-based ceramic continuous fiber. According to the preparation method, the electron deficiency effect of boron is utilized, and addition reaction of water is carried out on the boric acid to formB(OH)4<->, so that the boric acid can be stably combined with polyhydroxyl pseudo-boehmite nano-particles so as to prepare the spinnable precursor sol and the fiber with excellent properties. The method has the advantages that the raw materials are easy to obtain, and industrialized application is easy to realize; and the diameter of the prepared fiber is 5-8 microns, the strength of the single fiber can reach 2.0 GPa, the modulus can reach 149 GPa, and various excellent performances such as high temperature resistance, flexibility and spinnability are achieved.

Description

technical field [0001] The present invention relates to a kind of containing 1~5wt% B 2 o 3 The invention discloses a method for preparing alumina-based ceramic continuous fibers, belonging to the field of inorganic non-metallic materials. Background technique [0002] Alumina-based ceramic continuous fibers are mainly based on Al 2 o 3 Ceramic fiber as the main component has the advantages of high mechanical tensile strength and chemical corrosion resistance, but also has the disadvantages of easy pulverization, easy fracture, and non-softness; adding a second phase such as SiO 2 , ZrO 2 , B 2 o 3 , Fe 2 o 3 etc., can improve the internal structure and physical properties of the fiber; for example, mullite is Al 2 o 3 -SiO 2 A stable binary compound, adding boron oxide can increase the nucleation density of mullite, promote the transformation of mullite (see: J.Europ.Ceram.Soc.1996, 16:287) and reduce grain growth. [0003] Nextel TM -312 fiber is the first con...

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Problems solved by technology

As another example, Liu Wensheng et al. (see patent literature: CN106609404A) used inorganic aluminum salt, aluminum hypoacetate, silica sol and boron-containing additives as raw materials to prepare a low-density high-performance alumina ceramic fiber by sol-gel method. The density is 2.6~2.67g / cm 3 , with a diameter of 8-18 μm and a tensile strength of 1.4-1.65 GPa, but the diameter is still relatively thick and the tensile strength is relatively low

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