CN104402515A - Porous cordierite ceramic prepared by taking walnut hull powder as pore former - Google Patents

Abstract

The invention relates to a porous cordierite ceramic prepared by taking walnut hull powder as a pore former. The ceramic is prepared by mixing and grinding talcum, kaoline, calcined kaoline, alumina, aluminum hydroxide, quartz and MC (Methyl Cellulose) By weight percentage, putting into a body mold for forming, drying a formed body, roasting, and holding the temperature for a certain time. A method is used for the porous cordierite ceramic prepared by taking the walnut hull powder as the pore former; the ceramic meeting national standard requirements is obtained; at the same time, apparent porosity of the ceramic reaches above 50%; a pore size reaches about 2.5 micrometers; a pore size scope is 2.0-3.0 micrometers; and the pore distribution is uniform, so that PM2.5 (Particulate Matter 2.5) in gas is absorbed to achieve an effect of purifying air. A walnut hull has a higher decomposition temperature which is matched with a ceramic forming temperature of the cordierite ceramic, so that uniform pores can be formed in the ceramic body more easily; compared with an inorganic pore former, the walnut hull is decomposed more completely without any impurities, and a cordierite pure phase of the ceramic is unaffected.

Description

With the porous cordierite ceramic that Cortex walnut powder is prepared for pore-forming material

Technical field

The present invention relates to a kind of preparation of porous cordierite ceramic, the green material prepared for pore-forming material with Cortex walnut powder and preparation method.

Background technology

Atmospheric polluting material PM2.5 pollution condition is day by day serious in recent years, and PM2.5 represents the content that can suck lung particle in every cubic metres of air, and its diameter is less than or equal to 2.5 microns.PM2.5 is mostly containing toxic substances such as heavy metals, very large to the quality influence of HUMAN HEALTH and atmospheric environment.Atmospheric pollution is current urgent need to solve the problem.Research at present to porous cordierite ceramics aspect, mainly for porosity raising and require less to aperture, the pore-forming material of employing is starch, urea, calcium carbonate etc.Cortex walnut due to its decomposition temperature higher, with trichroite become porcelain temperature relatively close, cause pottery aperture good control relative to porosity.Be that pore-forming material adjusts aperture and the porosity of cordierite ceramic by the particle diameter and add-on controlling pore-forming material with walnut powder, obtain the cordierite ceramic of the aperture 2.5um of higher porosity, the research of this aspect have not been reported.

" silicate journal ", 2006,2:247-250 Zhang Xuebin, Ren Xiangjun, Wang Songlin, Liu Xingqin, Meng Guangyao in the fabrication & properties of the porous cordierite ceramics " characterize " literary composition with flyash and magnesium basic carbonate for main raw material starch for pore-forming material has obtained porous cordierite ceramics material.Sintering process is 1300 DEG C of insulation 4h.The porosity of sample and aperture increase with the increase of starch content in raw material.In the feed add 40% pore-forming material can make the porosity of sample, mean pore size for and nitrogen flux reach 41.7%, 2135 μm and 0.225mh respectively ^-1.Pa ^-1." Chinese pottery ", 2012,2:49-53 woods star pump, Wu Renping, " the preparation and property research of cordierite porous ceramics " literary composition of Yu Yan, Zeng Zhaowang shows using urea as pore-forming material, and the technique preparing the cordierite porous ceramics of high porosity low expansion is feasible, and the porosity of cordierite porous ceramics is in 70%, and ultimate compression strength reaches 3.310Mpa." Rare Metals Materials and engineering ", 2009,12:366-368 Zhou Lizhong, Wang Changan, Liu Weiyuan, be shaping medium and pore-forming material with the trimethyl carbinol in " TiO2 is on the impact of porous cordierite ceramics microstructure and properties " literary composition of Huang Yong, titanium dioxide is sintering aid, adopts gel casting and non-pressure sintering technology to prepare porous cordierite ceramics.What show titanium dioxide adds the low-temperature sintering performance that improve cordierite powder, and under the prerequisite obviously not reducing porous cordierite ceramics void content and do not change its air hole structure, aperture size distribution, the mechanical property of material obtains remarkable improvement.

Above-mentioned research has carried out preparation and property sign to porous cordierite ceramic, stresses the improvement of raising to porosity and mechanical property, and lacks the research to pore size and distribution.And there is no relevant report with the method that Cortex walnut powder prepares porous ceramics for pore-forming material.

Summary of the invention:

Object of the present invention is just for above-mentioned the deficiencies in the prior art, provides a kind of Cortex walnut powder to be the porous cordierite ceramic prepared of pore-forming material and preparation method.It is 2.5 μm that the method can prepare aperture, pore diameter range 2.0-3.0 μm, and pore distribution is even, and water-intake rate is 42.73%, and apparent porosity is 50.88%, and volumetric shrinkage is 16.29%, and unit weight is 1.19g/cm ³, bending strength is 35.0MPa, and ultimate compression strength is 41MPa, and the crystalline phase of pottery is trichroite pure phase.This pottery can meet GB/16533-1996 simultaneously, GB/1964-1996, GB/1965-hole 1996, GB/1966-1996, GB/1967-1996, GB/1969-1996 porous ceramics product standard.

The object of the invention is to be achieved through the following technical solutions:

Ceramic raw material weight per-cent is: talcum 35-40%, kaolin 15-20%, calcined kaolin 20-25%, aluminum oxide 5%, aluminium hydroxide 10%, silicon-dioxide 3%, MC5%.

Porous ceramics compound weight percent is: ceramic compound 70%, pore-forming material 30%.

Porous cordierite ceramic is prepared in the following order with step:

A, by ceramic raw material weight per-cent, by raw material Homogeneous phase mixing, grinding, be less than 250 orders to grain diameter;

B, pulverization process is carried out to Cortex walnut powder, and to be milled to grain diameter be 1000-1200 order:;

C, by porous ceramics compound weight percent, raw material to be mixed with pore-forming material;

D, compound is inserted porcelain base mould molding, forming pressure 200MPa, pressurize 45s retreats mould, seasoning 12h;

E, shaping base substrate is entered kiln, adopt gradient increased temperature, heating schedule is as follows: most high sintering temperature 1380 DEG C, less than 550 DEG C temperature rise rates, 1-2 DEG C/min, more than 550 DEG C temperature rise rates, 3-5 DEG C/min, 150 DEG C of insulation 30min, 250 DEG C of insulation 20min, 550 DEG C of insulation 30min, 750 DEG C of insulation 20min, 900 DEG C of insulations 30min, 1380 DEG C of soaking time 2h;

After f, furnace cooling porous porcelain.

Beneficial effect: the aperture of preparing cordierite ceramic is about 2.5um, thus the PM2.5 absorbed in gas reaches the effect purified air.With Cortex walnut powder for pore-forming material is compared with other organism, Cortex walnut has higher decomposition temperature, and matches with the porcelain temperature that becomes of cordierite ceramic, easilier in ceramic body, forms uniform hole; Compared with inorganics pore-forming material, Cortex walnut decomposes more complete, and do not have impurities left, can not affect ceramic cordierite pure phase, ceramic mass is good.

Embodiment:

Be described in further detail below in conjunction with embodiment:

Porous cordierite ceramic is prepared in the following order with step:

A, size and number design raw material total amount according to preparation pottery, by ceramic raw material weight per-cent, talcum 35-40%, kaolin 15-20%, calcined kaolin 20-25%, aluminum oxide 5%, aluminium hydroxide 10%, silicon-dioxide 3%, MC5%, by raw material Homogeneous phase mixing, grinding, are less than 250 orders to grain diameter;

B, pulverization process is carried out to Cortex walnut powder, and to be milled to grain diameter be 1000-1200 order:;

C, by porous ceramics compound weight percent, raw material to be mixed with pore-forming material;

D, compound is inserted porcelain base mould molding, forming pressure 200MPa, pressurize 45s retreats mould, seasoning 12h;

E, shaping base substrate is entered kiln, adopt gradient increased temperature, heating schedule is as follows: most high sintering temperature 1380 DEG C, less than 550 DEG C temperature rise rates, 1-2 DEG C/min, more than 550 DEG C temperature rise rates, 3-5 DEG C/min, 150 DEG C of insulation 30min, 250 DEG C of insulation 20min, 550 DEG C of insulation 30min, 750 DEG C of insulation 20min, 900 DEG C of insulations 30min, 1380 DEG C of soaking time 2h;

After f, furnace cooling porous porcelain.

Embodiment 1

A, size and number design raw material total amount according to preparation pottery, by ceramic raw material weight per-cent, talcum 36%, kaolin 18%, calcined kaolin 23%, aluminum oxide 5%, aluminium hydroxide 10%, silicon-dioxide 3%, MC5%, by raw material Homogeneous phase mixing, grinding, are less than 250 orders to grain diameter;

B, pulverization process is carried out to Cortex walnut powder, and to be milled to grain diameter be 1000-1200 order:;

C, by porous ceramics compound weight percent, raw material to be mixed with pore-forming material;

D, compound is inserted porcelain base mould molding, forming pressure 200MPa, pressurize 45s retreats mould, seasoning 12h;

E, shaping base substrate is entered kiln, adopt gradient increased temperature, heating schedule is as follows: most high sintering temperature 1380 DEG C, less than 550 DEG C temperature rise rates, 1.5 DEG C/min, more than 550 DEG C temperature rise rates, 4 DEG C/min, 150 DEG C of insulation 30min, 250 DEG C of insulation 20min, 550 DEG C of insulation 30min, 750 DEG C of insulation 20min, 900 DEG C of insulations 30min, 1380 DEG C of soaking time 2h;

After f, furnace cooling porous porcelain.

Embodiment 2

A, size and number design raw material total amount according to preparation pottery, by ceramic raw material weight per-cent, talcum 38%, kaolin 17%, calcined kaolin 22%, aluminum oxide 5%, aluminium hydroxide 10%, silicon-dioxide 3%, MC5%.By raw material Homogeneous phase mixing, grinding, be less than 250 orders to grain diameter;

B, pulverization process is carried out to Cortex walnut powder, and to be milled to grain diameter be 1000-1200 order:;

C, by porous ceramics compound weight percent, raw material to be mixed with pore-forming material;

D, compound is inserted porcelain base mould molding, forming pressure 200MPa, pressurize 45s retreats mould, seasoning 12h;

E, shaping base substrate is entered kiln, adopt gradient increased temperature, heating schedule is as follows: most high sintering temperature 1380 DEG C, less than 550 DEG C temperature rise rates, 1 DEG C/min, more than 550 DEG C temperature rise rates, 5 DEG C/min, 150 DEG C of insulation 30min, 250 DEG C of insulation 20min, 550 DEG C of insulation 30min, 750 DEG C of insulation 20min, 900 DEG C of insulations 30min, 1380 DEG C of soaking time 2h;

After f, furnace cooling porous porcelain.

Embodiment 3

A, size and number design raw material total amount according to preparation pottery, by ceramic raw material weight per-cent, talcum 35%, kaolin 19%, calcined kaolin 23%, aluminum oxide 5%, aluminium hydroxide 10%, silicon-dioxide 3%, MC5%.By raw material Homogeneous phase mixing, grinding, be less than 250 orders to grain diameter;

B, pulverization process is carried out to Cortex walnut powder, and to be milled to grain diameter be 1000-1200 order:;

C, by porous ceramics compound weight percent, raw material to be mixed with pore-forming material;

D, compound is inserted porcelain base mould molding, forming pressure 200MPa, pressurize 45s retreats mould, seasoning 12h;

E, shaping base substrate is entered kiln, adopt gradient increased temperature, heating schedule is as follows: most high sintering temperature 1380 DEG C, less than 550 DEG C temperature rise rates, 2 DEG C/min, more than 550 DEG C temperature rise rates, 3 DEG C/min, 150 DEG C of insulation 30min, 250 DEG C of insulation 20min, 550 DEG C of insulation 30min, 750 DEG C of insulation 20min, 900 DEG C of insulations 30min, 1380 DEG C of soaking time 2h;

After f, furnace cooling porous porcelain.

Claims (3)

1. the porous cordierite ceramic prepared for pore-forming material with Cortex walnut powder, it is characterized in that prepared pottery meets GB/16533-1996, GB/1964-1996, GB/1965-1996, GB/1966-1996, GB/1967-1996, GB/1969-1996 porous ceramics product standard, apparent porosity is greater than 50%, and aperture is about 2.5 μm, pore diameter range 2.0 μm-3.0 μm, and pore distribution is even.

2. a kind of porous cordierite ceramic prepared for pore-forming material with Cortex walnut powder according to claim 1, its pure ceramic raw material weight per-cent is: talcum 35-40%, kaolin 15-20%, calcined kaolin 20-25%, aluminum oxide 5%, aluminium hydroxide 10%, silicon-dioxide 3%, MC5%;

Porous ceramics compound weight percent is: ceramic compound 70%, pore-forming material 30%.

3. according to claim 2 a kind of with the preparation method of the Cortex walnut powder porous cordierite ceramic that is pore-forming material, in the following order and step:

A, by ceramic raw material weight per-cent, by raw material Homogeneous phase mixing, grinding, be less than 250 orders to grain diameter;

B, pulverization process is carried out to Cortex walnut powder, and to be milled to grain diameter be 1000-1200 order:;

C, by porous ceramics compound weight percent, raw material to be mixed with pore-forming material;

D, compound is inserted porcelain base mould molding, forming pressure 200MPa, pressurize 45s retreats mould, seasoning 12h;

E, shaping base substrate is entered kiln, adopt gradient increased temperature, heating schedule is as follows: most high sintering temperature 1380 DEG C, less than 550 DEG C temperature rise rates, 1-2 DEG C/min, more than 550 DEG C temperature rise rates, 3-5 DEG C/min, 150 DEG C of insulation 30min, 250 DEG C of insulation 20min, 550 DEG C of insulation 30min, 750 DEG C of insulation 20min, 900 DEG C of insulations 30min, 1380 DEG C of soaking time 2h;

After f, furnace cooling porous porcelain.