Self-reinforcing type ceramic fibre pouring material and preparation thereof

Abstract

The invention discloses a self-enhanced type ceramic fiber castable and a method for preparing the same. The ceramic fiber castable is mixed by a matrix slurry and a grading ceramic fiber particle which is mixed by a ceramic fiber particle with a grain size of 3-8mm and a ceramic fiber particle with a grain size of 1-2mm, wherein each component content(weight) range is as follows: grading ceramic fiber particle 70%-10% and the matrix slurry 30%-90%. The matrix slurry is mixed by a based burden and a polyvinyl alcohol solution accounting for 30%-45% of the based burden weight, wherein each component content range (by total weight 100%) of the based burden is as follows: short ceramic fiber with a length less than or equal to 7mm 10-40%, ceramic powder with a grain size less than or equal to 0.088mm 70%-40%, foaming agent 5%-10%, plasticizer 0.5%-5% and high temperature binding agent 14.5%-5%. The castable of the invention has advantages of good high temperature resistance and heat insulation performance, high intension and nonchalking of the ceramic fiber in the furnace lining after long time usage at high temperature.

Description

technical field [0001] The invention relates to a casting material and a preparation method thereof, in particular to a self-reinforced ceramic fiber casting material and a preparation method thereof, which can be widely used in the fields of processing and construction of lining materials of industrial high-temperature kilns (boilers), as well as in the chemical industry The processing and construction of some insulation layer materials such as high-temperature reactors and high-temperature pipelines. Background technique [0002] Ceramic fiber is a light-weight refractory material with good performance. The heat storage of ceramic fiber lining is 1 / 3 of that of brick lining, but its weight is only 1 / 10 to 1 / 20; the use of ceramic fiber can greatly reduce the furnace body. Weight, speed up the heating speed of the thermal kiln. The current ceramic fiber blankets, felts, boards and other products have low strength and will be pulverized after use, resulting in a shorter lif...

AI Technical Summary

Problems solved by technology

Although the existing patented refractory fiber castable (application number 200510038071.1) uses a large number of short ceramic fibers in the castable, it only utilizes the reinforced structure of the ceramic fiber; and the heat insulation effect of the castable is It is borne by the tiny voids left by the polystyrene particles and floating beads in the castable during post-treatment, so the excellent heat insulation performance of ceramic fiber itself is not effectively used

There is also the granular refractory fiber castable (application number 03210913.X) that has been applied for patents at present, which utilizes the heat insulation performance of ceramic fibers, but the matrix part of the castable adopts the material and structure of ordinary refractory castables. This will make the granular ceramic fiber castable construction obtain the overall furnace lining, the heat insulation and thermal insulation properties of the furnace lining will be uneven, resulting in a decline in its thermal insulation ability; in addition, the granular ceramic fiber in the patent (for ease of description) , hereinafter referred to as "ceramic fiber particles") adopts an organic resin shell for waterproofing. It needs to increase the operation process of burning off the organic resin in the subsequent heat treatment of the castable, causing smoke and dust pollution on the construction site; In the material structure, a large number of fiber particles and the gaps caused by the detachment of the matrix will be left, which will weaken the combination between the matrix and the aggregate (granular ceramic fiber), and reduce the overall structural strength of the furnace lining.

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