CN103804016A - Engineering ceramic - Google Patents

Abstract

The invention relates to engineering ceramic, which comprises main raw materials in percentage by weight: 30% of kaolin, 40% of talcum powder, 30% of aluminum oxide and auxiliary raw materials including binder carbxymethyl cellulose, lubricant tung oil, plasticizer glycerinum, and dispergator oleic acid. A preparation method of the engineering ceramic comprises the following steps: adding the solid raw materials for preparing the ceramic into a pugmill, and mixing under certain vacuum degree and temperature; adding the resin binder for extrusion forming; drying the formed blank by adopting microwave; cutting according to required dimension; performing constant-temperature sintering and setting. Pore passages of the honeycomb ceramic in per square inch can achieve more than 400, the wall thickness can achieve 0.05, and the specific surface area of each pore is 0.2-0.3m<2>/g; the thermal expansion coefficient can achieve 0.6-10<-6>/DEG C; the contact area of gas in a catalytic converter is more than 2000m<2> on average.

Description

Engineering ceramics

technical fieldthe present invention relates to a kind of ceramic honey comb.

background technologyceramic honey comb is a kind of porous industrial ceramic, and to have specific surface area large with general particulate state ceramic phase ratio for it, and therefore the features such as the easy ignition of surface catalysis are specially adapted to the support of the catalyst of various uses.Aspect the firm degree of being combined at cost, with catalyzer due to honeycomb ceramic carrier, be better than alloy cellular carrier, on being therefore widely used in and curbing environmental pollution.In order to control the exhaust emission of automobile, reduce the discharge of carbon monoxide, black smoke and other toxic gases.CC Catalytic Converter has been used on automobile.Current domestic ceramic honey comb intensity is low, catalytic efficiency is not high, wall thickness is bigger than normal, specific surface area is little, and when it uses as support of the catalyst, the three-element catalytic dosage of coating is just few, and resistance of exhaust increases, and affects the normal performance of automotive performance.

summary of the inventionthe object of the present invention is to provide the engineering ceramics that a kind of intensity is high, wall is thin, specific surface area is large, gas-flow resistance is little.

One, the present invention adopts following main raw material: kaolin 30%, talcum powder 40%, aluminium sesquioxide 30% and auxiliary material: tackiness agent carboxymethyl cellulose, lubricant tung oil, softening agent glycerine, the product that dispergator oleic acid makes.

Two, preparation method of the present invention is as follows:

1, raw material is synthetic

1) kaolin, talcum powder and aluminium sesquioxide are added together and it are carried out to hyperfine processing by impact grinding or airflow milling;

2) in above-mentioned main raw material powder, add tackiness agent carboxymethyl cellulose again, lubricant tung oil, softening agent glycerine, dispergator oleic acid and water, be mixed and made into fluid;

3) above-mentioned fluid is sprayed and be dried, must prepare ceramic solid material.

2, the preparation of engineering ceramics

1) solid material of above-mentioned preparation pottery is added in soil kneader, mixing at certain vacuum degree and temperature;

2) add resin glue extrusion molding;

3) blank of employing microwave drying moulding;

4) size on demand cutting;

5) constant temperature sintering sizing.

The present invention compared with prior art tool has the following advantages:

1, ceramic honey comb of the present invention reaches more than 400 in duct per square inch, and wall thickness can reach 0.05, and the specific surface area in hole is 0.2-0.3 meters squared per gram; Thermal expansivity can reach 0.6 × 10-6/ ℃.

2, the so-called spongy crystallization that ceramic monolith surface forms, make gas contact area in CC Catalytic Converter on average more than 2000 square metres, also make gas molecule in CC Catalytic Converter, have sufficiently high probability and the effective catalyst conversion reaction of precious metal atom collision generation simultaneously.Many approximately beam traces, both for gas solid catalytic reaction provides large contact area, can make again the pressure decreased of air-flow to less.

embodiment

Example 1

Kaolin, talcum powder and aluminium sesquioxide are added together by the mass ratio of 3:4:3, it are carried out to hyperfine processing by impact grinding or airflow milling; In above-mentioned main raw material powder, add tackiness agent carboxymethyl cellulose again, lubricant tung oil, softening agent glycerine, dispergator oleic acid and water, be mixed and made into fluid; Above-mentioned fluid is sprayed dry, must prepare ceramic solid material.The solid material of above-mentioned preparation pottery is added in soil kneader, mixing at certain vacuum degree and temperature; Add resin glue extrusion molding; Adopt the blank of microwave drying moulding; Size cutting on demand; The sizing of constant temperature sintering.

Claims (2)

1. an engineering ceramics, is characterized in that: the present invention adopts following main raw material: kaolin 30%, talcum powder 40%, aluminium sesquioxide 30% and auxiliary material: tackiness agent carboxymethyl cellulose, lubricant tung oil, softening agent glycerine, the product that dispergator oleic acid makes.

2. engineering ceramics according to claim 1, is characterized in that: preparation method is as follows:

1) solid material of above-mentioned preparation pottery is added in soil kneader, mixing at certain vacuum degree and temperature;

2) add resin glue extrusion molding;

3) blank of employing microwave drying moulding;

4) size on demand cutting;

5) constant temperature sintering sizing.