A kind of preparation method of alumina fiber blanket

Abstract

The invention belongs to the technical field of refractory materials, and in particular relates to a method for preparing an alumina fiber blanket, comprising the following steps: a) forming fibers from a spinning stock solution containing an aluminum source and a silicon source, and collecting the obtained fiber filaments to obtain A precursor fiber base with a moisture content of 5-35%; b) sequentially curing and acupuncture the precursor fiber base to obtain a precursor fiber blanket; the curing temperature is 30-200°C, and the relative humidity is 20 ~90RH%, the time is 10~60min; c) performing heat treatment on the precursor fiber blanket to obtain the alumina fiber blanket. The method provided by the present invention maintains the precursor fiber with a specific moisture content at a specific temperature and humidity, and ensures that the fiber has higher strength while ensuring the moisture content inside the fiber, reducing the gap between the fiber and the fiber. resistance, so that the precursor fiber base can be needle-punched and interwoven into a blanket without adding any grease.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method of an alumina fiber blanket. Background technique [0002] Alumina fiber is an ultra-light, heat-insulating, energy-saving, refractory fibrous material that is spun into fibers by the "sol-gel" chemical method, and the main crystal phase is transformed into mullite phase after high-temperature calcination. The main component is A1 2 o 3 , containing a small amount of SiO 2 , the maximum operating temperature is 1600°C, and the long-term operating temperature is 1300-1500°C. Alumina fiber can be processed into different types of products according to the requirements of use, including: alumina fiber cotton, alumina fiber needle-punched blanket, alumina fiber module, alumina fiber liner, alumina fiber board, etc. Among them, the alumina fiber needle-punched blanket is an alumina fiber needle-punched blanket prepared by needle-punchin...

AI Technical Summary

Problems solved by technology

The spinning solution containing aluminum source and silicon source is dispersed and dried in an instant through centrifugal spinning or blow spinning process, and the strength of the prepared fiber is relatively poor, and it is affected by multiple parameters, which fluctuates greatly, so it is difficult to directly spin stabbed into a blanket

[0004] In the production process of the traditional ceramic fiber needle-punched blanket, in order to reduce the needle-punching resistance of the fiber blank, reduce the wear of the needle, and realize the interweaving of fibers into a blanket, a certain amount of organic grease needs to be added while forming fibers, but this method exists Two problems: one is that the grease will produce tar under the action of high temperature, which will accumulate in the cotton collection equipment and the air-inducing pipeline, and the long-term accumulation may cause the risk of fire, which increases the safety hazard during production; the other is organic grease In the process of high temperature treatment, organic waste gas (VOCs) will be generated, causing environmental pollution

Images