CN101628825A

CN101628825A - Preparation method of foamed bird-nest honeycomb ceramic

Info

Publication number: CN101628825A
Application number: CN200910115749A
Authority: CN
Inventors: 姚光纯; 张玉华
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-24
Filing date: 2009-07-24
Publication date: 2010-01-20

Abstract

The invention discloses a preparation method of a foamed bird-nest honeycomb ceramic. The method comprises the following steps: the raw materials for preparing the bird-nest honeycomb ceramic are mixed and ball-milled according to proportion and sieved into mixed material after ball milling, the mixed material is added in a pug mill, then a proper amount of water and adhesive agent are added in the pug mill for pug milling to form pug, the pug is added in a die to be pressed and molded into blank, the blank is dried and then the dried blank is fired in a high-temperature furnace to form bird-nest honeycomb ceramic, the mixed material in the step 1 is taken and added with a proper amount of water and foaming agent to be prepared into suspension containing the foaming agent, then the suspension is evenly coated on the inner surface and the outer surface of the bird-nest honeycomb ceramic by a spraying method, and the bird-nest honeycomb ceramic coated with a foam layer is sintered and insulated at 1350 DEG C. The invention is a composite ceramic, the composite ceramic not only has larger specific surface-area and higher porosity, but also is easy to be coated with Pt, Au, Pd, Co, Mo and Ni with catalytic activities on the specific surface after being applied to the field of catalysis, thereby improving the catalytic efficiency and saving the consumption of the catalyst.

Description

The preparation method of foamed bird-nest honeycomb ceramic

Technical field

The present invention relates to a kind of preparation method of combined type ceramic honey comb.

Background technology

As everyone knows, ceramic honey comb is that a kind of to have a light specific gravity, porosity height, specific surface area big, and thermal conductivity is good, thermal resistance is little, heat storage capacity is strong, and structure is like the new ceramics product of honeycomb shape.In the industry such as its widespread use chemical industry, electric power, metallurgy, oil, electronic apparatus, automobile, environmental protection, and obtain save energy, reduced noxious gas emission, reduced the positive effect of environmental pollution.Particularly honeycomb ceramic body is as the heat storage of the heat accumulating type high-temperature air burning new technology (HTAC) with energy-efficient and environmental protection double effects, the application of in various industrial heating furnace heat-storage type burners such as iron and steel, petrochemical industry and environmental protection, having succeeded, wherein heat storage is key and the core component in the heat-storage type burner, but ceramic honey comb is applied to catalytic field, it is not very good that its hole inner wall surface applies Pt, Au, Pd, Co, performances such as Mo, Ni with catalytic activity, catalytic efficiency is not high, and the catalyzer usage quantity is big.

Summary of the invention

It is stronger to the purpose of this invention is to provide a kind of heat storage capacity, and can apply the preparation method of the foamed bird-nest honeycomb ceramic of catalytically-active metals again.

The preparation method of foamed bird-nest honeycomb ceramic, its method steps is:

(1) raw material that will prepare the Bird's Nest ceramic honey comb carries out being screened into compound behind mixing and ball milling, the ball milling in proportion,

(2) add compound in the soil kneader, in soil kneader, add an amount of water and caking agent again and refine mud and form pug,

(3) pug is added be pressed in the mould base substrate, again base substrate is carried out drying, dried base substrate fired in high temperature kiln formed the Bird's Nest ceramic honey comb again,

(4) get compound in the aforesaid method step 1, in this compound, add an amount of water and whipping agent, make the suspension that contains whipping agent,

(5) method with spraying evenly is coated in Bird's Nest ceramic honey comb surfaces externally and internally with suspension, again will be the Bird's Nest ceramic honey comb of sprayed suspension under 1350 ℃ of high temperature, be incubated and fires, make Bird's Nest ceramic honey comb surfaces externally and internally formation one deck have the foam layer of micropore.

Described whipping agent is sodium bicarbonate, bicarbonate of ammonia or Sodium bicarbonate.Because whipping agent has the volatilization of gas to overflow, therefore can form uniform micropore at honeycomb porcelain surfaces externally and internally in the product sintering procedure.

Because whipping agent is the essential factor that forms foam layer, consumption that therefore can be by regulating whipping agent and the size that kind is come adjustment hole, what, uniformity coefficient to be to satisfy the demand of different field.

The present invention is owing to apply one deck foam layer on the inner wall surface of Bird's Nest ceramic honey comb hole, form a kind of composite ceramics, the Bird's Nest ceramic honey comb of this combined type has bigger specific surface area, perforate void content, be applied to catalytic field, be easier to have Pt, Au, Pd, Co, Mo, the Ni etc. of catalytic activity in Bird's Nest ceramic honey comb surface-coated, thereby catalytic efficiency, save catalyst usage quantity have been improved; Compare with use more foamed ceramics in filtration art, have bigger intensity, so it is the selection preferably that substitutes existing foamed ceramics.

Embodiment

Embodiment 1, and the preparation method of described foamed bird-nest honeycomb ceramic is:

Aluminum oxide powder with 20%wt, the clay of 30%wt, the talcum of 38%wt, four kinds of raw materials of the feldspar of 12%wt carried out mixing and ball milling 5 hours, cross 250 mesh sieves behind the ball milling and form compound, compound is added in the soil kneader, in soil kneader, add again and account for the water of compound gross weight 15% and 5% tung oil refines mud, formation has the flexible pug, again pug is added and be delthyrium, the die for molding of square hole or circular hole forms base substrate, again base substrate is carried out 20 hours dryings, again dried base substrate is fired in 1350 ℃ of high temperature kilns, form the Bird's Nest ceramic honey comb, other gets the compound behind the ball milling, add an amount of water and sodium bicarbonate whipping agent in this compound, fully stirring and making proportion is 1.8g/cm ³Suspension, the suspension that will contain whipping agent with the method that sprays evenly is coated in Bird's Nest ceramic honey comb surfaces externally and internally, the Bird's Nest ceramic honey comb that will apply foam layer more carries out sintering under 1350 ℃, so that Bird's Nest ceramic honey comb and foam layer form good binding.

Embodiment 2, and the preparation method of described foamed bird-nest honeycomb ceramic is:

Aluminum oxide powder with 25%wt, the clay of 40%wt, the talcum of 25%wt, four kinds of raw materials of the marble of 10%wt carried out mixing and ball milling 8 hours, cross 250 mesh sieves behind the ball milling and form compound, compound is added in the soil kneader, in soil kneader, add again and account for the water of compound gross weight 12% and 3% tung oil refines mud, formation has the flexible pug, again pug is added and be delthyrium, the die for molding of square hole or circular hole forms base substrate, again base substrate is carried out 20 hours dryings, again dried base substrate is fired in 1350 ℃ of high temperature kilns, form the Bird's Nest ceramic honey comb, other gets the compound behind the ball milling, add an amount of water and bicarbonate of ammonia whipping agent in this compound, fully stirring and making proportion is 1.72g/cm ³Suspension, the suspension that will contain whipping agent with the method that sprays evenly is coated in Bird's Nest ceramic honey comb surfaces externally and internally, the Bird's Nest ceramic honey comb that will apply foam layer more carries out sintering under 1350 ℃, so that Bird's Nest ceramic honey comb and foam layer form good binding.

Claims

1, the preparation method of foamed bird-nest honeycomb ceramic is characterized in that: preparation method's step of described foamed bird-nest honeycomb ceramic is:

(1) raw material that will prepare the Bird's Nest ceramic honey comb carries out mixing and ball milling in proportion, is screened into compound behind the ball milling,

(2) compound is added in the soil kneader, in soil kneader, adds an amount of water and caking agent again and refine mud formation pug,

(3) pug is added compression moulding becomes base substrate in the mould, again base substrate is carried out drying, dried base substrate is fired in high temperature kiln formed the Bird's Nest ceramic honey comb again,

(5) method with spraying evenly is coated in Bird's Nest ceramic honey comb surfaces externally and internally with suspension, incites somebody to action Bird's Nest ceramic honey comb heat preservation sintering under 1350 ℃ of high temperature of sprayed suspension again, makes Bird's Nest ceramic honey comb hole surfaces externally and internally form the foam layer that one deck has micropore.

2, require the preparation method of 1 described foamed bird-nest honeycomb ceramic according to power, it is characterized in that: described whipping agent is sodium bicarbonate, bicarbonate of ammonia or Sodium bicarbonate.

3, require the preparation method of 1 described foamed bird-nest honeycomb ceramic according to power, it is characterized in that: described binding agent is a tung oil.