CN115611650A

CN115611650A - Method for manufacturing high-temperature-resistant ceramic fiber board

Info

Publication number: CN115611650A
Application number: CN202211235895.8A
Authority: CN
Inventors: 王国庆
Original assignee: Luoyang Xuke New Material Co ltd
Current assignee: Luoyang Xuke New Material Co ltd
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2023-01-17

Abstract

The invention provides a method for manufacturing a high-temperature-resistant ceramic fiber board, which mainly comprises six steps of mixing and preparing materials, preheating a dispersing agent, flocculating and scattering, blank making, drying, firing and the like.

Description

Method for manufacturing high-temperature-resistant ceramic fiber board

Technical Field

The invention belongs to the technical field of ceramic fiber board manufacturing, and particularly relates to a manufacturing method of a high-temperature-resistant ceramic fiber board.

Background

The basic components of ceramic fiber boards are ceramic fibers and fillers, which, after mixing, are added with a dispersant to form a milky suspension. In order to improve the heat insulation performance, high temperature resistance and the like, various fillers such as silica, alumina, zirconia and the like are often added in the forming process. The ceramic fiber board has the advantages of high heat resistance, good heat insulation effect, good thermal shock resistance, small linear shrinkage, light weight and convenient construction, and is an ideal energy-saving material for kilns, pipelines and other heat-preservation equipment. It is mainly made up by using ceramic fibre cotton, filling material, dispersing agent and binding agent through a certain preparation process. Wherein the ceramic cellucotton accounts for a large proportion of about 65-90 percent, and the alumina cellucotton is usually adopted. The binder needs to be treated by adding a solvent, so that macromolecular chains of the binder are opened to form naked hydroxyl groups, the cellucotton and the filler can form stable floccules on the basis of molecular bond bonding, and the original powdery binder forms a uniform and transparent solution. Therefore, the molecular chain of the binding agent can be mixed to prepare better spreading degree in the preparation of the fiber board, and is very important for the preparation of the fiber board. The conventional preparation method is to mix the bonding agent and the solvent according to a certain proportion, stir the mixture and then add the mixture into the mixed suspension of the fiber board, and can well form the fiber board. However, the consumption of the bonding agent is large, and the bonding degree of the cellucotton and the filling material is not high, so that the problem of manufacturing the high-performance high-temperature-resistant fiberboard is solved.

Disclosure of Invention

In order to solve the technical problems pointed out in the background art, the invention provides a manufacturing process which has the advantages of low consumption of a bonding agent and high bonding degree of a fiber cotton mixed solution and can be used for continuously producing high-temperature-resistant fiberboards in a large scale.

In order to achieve the aim, the invention discloses a preparation method of a ceramic fiberboard, which comprises six steps of mixing and preparing materials, preheating a binding agent, flocculating and scattering, blank making, drying, firing and the like, and specifically comprises the following steps:

preparing a preparation material: mixing ceramic fiber cotton and a solvent, stirring the mixture into floccule by a stirrer, adding a filler, continuously stirring, and adding a certain amount of a dispersing agent to obtain an emulsion suspension;

preheating a bonding agent: heating organic binder and methanol or water to obtain transparent and uniform pasty solution;

flocculation and scattering: adding a binding agent into the suspension prepared in advance, and scattering the suspension into small floccules by using a stirrer;

blank preparation: adding the floccule into a mould, and pressing into a blank with certain strength;

and (3) firing: and drying, firing and molding the blank.

Preferably, the ceramic fiber cotton is one or a combination of more of alumina fiber, alumina silicate fiber, zirconia fiber and quartz fiber.

Preferably, the solvent is one or a combination of methanol, n-butanol and water.

Preferably, the filler is one or a combination of more of silicon carbide, zirconium oxide, aluminum oxide and silicon oxide.

Preferably, the dispersant is one or more of aluminum sol, silica sol and zirconium sol.

Preferably, the binder is one or a combination of more of cellulose, starch and polyvinyl alcohol.

Preferably, the binder is a uniform and stable solution formed by heating and pasting after mixing the organic matter and water.

Preferably, after the green body is pressed and formed, the vacuum suction-filtered solvent is clear and can be recycled.

Preferably, the green body is dried at 50-220 ℃ for 5-36h.

Preferably, the green body is dried and then is sintered at the temperature of 1200-1700 ℃.

The invention has the following beneficial effects:

1. the ceramic fiber board made of the organic bonding agent and the solvent can effectively combine the filler and the fibers, thereby improving the performance of the ceramic fiber board;

2. the solution heated by the organic bonding agent is added into the ceramic fiber board prepared by the mixed preparation material, so that the use amount of the bonding agent can be effectively reduced, and the bonding degree of the ceramic fiber and the filler is further improved;

3. the ceramic fiber board formed by pressing has a fiber net framework mainly in the transverse direction, and the formed framework structure is more and uniformly distributed in depth. Heat conduction can be greatly reduced, so that the heat insulation effect is improved;

4. by utilizing vacuum suction filtration, the product has higher density and better molding, and in addition, the solvent can be recycled;

5. the ceramic fiber board after being heated and dried has small linear shrinkage variable;

6. the fiber board after high-temperature sintering has smaller wire shrinkage.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the embodiments described are only a part of the embodiments of the present invention, rather than all embodiments, and based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention. In order to make the aforementioned and other objects, features and advantages of the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below. In order to achieve the aim, the invention discloses a preparation method of a ceramic fiberboard, which comprises six steps of material mixing and preparation, binder preheating, flocculation scattering, blank making, drying, firing and the like, and specifically comprises the following steps:

preparing a preparation material: mixing ceramic fiber cotton with a solvent, stirring the mixture into flocculent by a stirrer, adding a filler, continuously stirring the mixture, and adding a certain amount of a dispersing agent to obtain an emulsion suspension;

preheating a bonding agent: heating the organic binder with water to form a transparent and uniform pasty solution;

blank preparation: adding the floccule into a mould, carrying out vacuum suction filtration, and pressing to form a blank with certain strength;

and (3) firing: and drying, firing and molding the blank.

Furthermore, the ceramic fiber cotton is one or a combination of more of alumina fiber, aluminum silicate fiber, zirconia fiber and quartz fiber.

Further, the solvent is one or more of methanol, n-butanol and water.

Furthermore, the filler is one or more of silicon carbide, zirconia, alumina, silica and boron oxide.

Furthermore, the dispersing agent is one or more of aluminum sol, silica sol and zirconium sol.

Furthermore, the binder is one or more of cellulose, starch, polyvinyl alcohol and dextrin powder.

Furthermore, the binder is a uniform and stable solution formed by heating and pasting after mixing the organic matter and water.

Furthermore, after the green body is pressed and formed, the extruded solvent is clear and can be recycled.

Furthermore, the blank is dried for 5 to 36 hours at the temperature of between 50 and 220 ℃.

Furthermore, the green body is dried and then is sintered at the temperature of 1200-1700 ℃.

Example 1

Preparing a preparation material: according to the weight percentage of alumina fiber cotton: zirconia powder: silica sol =70, added successively to water and stirred for 20min, to prepare a mixing preparation, wherein the silica sol has a solid content of 30%.

Preheating a bonding agent: and (3) diluting cellulose accounting for 5 percent of the total mass by adding methanol, and carrying out heat preservation at 80 ℃ for 0.5 hour to obtain the preheated bonding agent.

Flocculation and scattering: adding the preheated binder into the prepared materials, stirring to obtain a suspension, and stirring with a stirrer into a smaller flocculent shape.

Blank preparation: adding the floccule together with water into a mould, carrying out vacuum suction filtration, and pressing into a green body with certain strength by using a hydraulic press.

Drying and firing: and (3) putting the blank body into a drying box, preserving the heat for 24 hours at 70 ℃, and then putting the blank body into a kiln for firing and forming at 1500 ℃.

The concentration of the cellulose solution in this example was 6%.

The density of the ceramic fiber board in the embodiment is 0.4-0.8g/cm through thin film epitaxy, and the 1400-degree line shrinkage is 1.4%.

Example 2

Preparing a preparation material: according to the aluminum silicate fiber cotton: zirconia powder: alumina sol =70, added successively to water and stirred for 20min, to prepare a mixing preparation, wherein the solid content of the alumina sol is 30%.

Preheating a bonding agent: and adding water to dilute starch accounting for 5 percent of the total mass, and carrying out heat preservation at 95 ℃ for 0.5 hour to obtain the preheated bonding agent.

Flocculation and scattering: adding the preheated binder into the prepared material, stirring to make the suspension become flocculent, and stirring into smaller flocculent with a stirrer.

Blank preparation: adding the floccule together with water into a mould, carrying out vacuum suction filtration, and pressing into a blank body with certain strength by using a hydraulic press.

Drying and firing: and (3) putting the blank body into a drying box, preserving the heat for 24 hours at 120 ℃, and then putting the blank body into a kiln to be fired and formed at 1500 ℃.

The concentration of the starch solution in this example was 8%.

The density of the ceramic fiberboard in the embodiment is 0.5-0.85g/cm, and the linear shrinkage at 1500 ℃ is 1.6%.

Example 3

Preparing a preparation material: according to the weight percentage of the zirconia fiber cotton: silicon carbide powder: zirconium sol =60, added successively to water and stirred for 20min to prepare a pre-mix, wherein the zirconium sol has a solid content of 30%.

Preheating a bonding agent: and adding water to dilute polyvinyl alcohol accounting for 5 percent of the total mass, and carrying out heat preservation at 100 ℃ for 0.5 hour to obtain the preheated bonding agent.

Drying and firing: and (3) putting the blank body into a drying box, keeping the temperature at 160 ℃ for 36 hours, and then putting the blank body into a kiln to be fired and formed at 1600 ℃.

The concentration of the polyvinyl alcohol solution in this example was 4%.

The density of the ceramic fiber board in the embodiment is 0.5-0.75g/cm through thin film epitaxy, and the shrinkage at 1600 ℃ is 2.0%.

Example 4

Preparing a preparation material: according to quartz fiber cotton: alumina powder: silica sol =70, added successively to water and stirred for 20min, to prepare a mixing preparation, wherein the solid content of the alumina sol is 30%.

Preheating a bonding agent: and (3) adding water to dilute dextrin powder accounting for 5 percent of the total mass, and carrying out heat preservation at 80 ℃ for 0.6 hour to obtain the preheated bonding agent.

Drying and firing: and (3) putting the blank into a drying box, preserving the heat for 24 hours at the temperature of 80 ℃, and then putting the blank into a kiln for firing and forming at the temperature of 1500 ℃.

The concentration of the dextrin powder solution in this example was 5%.

The density of the ceramic fiber board in the embodiment is 0.5-0.75g/cm through thin film epitaxy, and the 1400-degree linear shrinkage is 1.6%.

Example 5

Preparing a preparation material: according to quartz fiber cotton: silicon carbide powder: aluminum sol: silica sol =60, added successively to water and stirred for 20min, configured as a mixing preparation, with the solid content of the aluminum sol being 30%.

Preheating a bonding agent: and (3) adding methanol into the dextrin powder accounting for 5 percent of the total mass for dilution, and carrying out heat preservation at 60 ℃ for 1 hour to obtain the preheated bonding agent.

Drying and firing: and (3) putting the blank body into a drying box, keeping the temperature at 80 ℃ for 24 hours, and then putting the blank body into a kiln to be fired and formed at 1500 ℃.

The concentration of the dextrin powder solution in this example was 5%.

The density of the ceramic fiberboard in the embodiment is 0.5-0.75g/cm, and the linear shrinkage at 1500 ℃ is 1.7%.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The manufacturing method of the high-temperature resistant ceramic fiberboard is characterized by comprising six steps of material mixing and preparation, binder preheating, flocculation and scattering, blank making, drying and firing, and specifically comprises the following steps: preparing a preparation material: mixing ceramic fiber cotton with a solvent, stirring the mixture into flocculent by a stirrer, adding a filler, continuously stirring the mixture, and adding a certain amount of a dispersing agent to obtain an emulsion suspension;

blank preparation: adding the floccule into a mould, carrying out vacuum suction filtration, and pressing into a blank with certain strength;

and (3) firing: and drying, firing and molding the blank.

2. The refractory ceramic fiber plate as defined in claim 1, wherein the ceramic fiber wool is one or more of alumina fiber, alumina silicate fiber, zirconia fiber and quartz fiber.

3. The refractory ceramic fiberboard of claim 1, wherein the solvent is one or more of methanol, n-butanol, and water.

4. The refractory ceramic fiber plate as in claim 1, wherein the filler is one or more of silicon carbide, zirconia, alumina and silica.

5. The refractory ceramic fiber board of claim 1, wherein the dispersant is one or more of an aluminum sol, a silica sol, and a zirconium sol.

6. The refractory ceramic fiber sheet according to claim 1, wherein the binder is one or more of cellulose, starch, and polyvinyl alcohol.

7. The refractory ceramic fiberboard of claim 1, wherein the binder is a homogeneous, stable solution formed by heating and pasting an organic material mixed with water.

8. The high temperature resistant ceramic fiberboard of claim 1, wherein the green body is dried at 50-220 ℃ for 5-36 hours.

9. The high temperature resistant ceramic fiber board of claim 1, wherein the green body is dried and then fired at a firing temperature of 1200 ℃ to 1700 ℃.