CN1415575A

CN1415575A - Method for producing kiln furniture made from cordierite

Info

Publication number: CN1415575A
Application number: CN 02145933
Authority: CN
Inventors: 周季楠; 刘光伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-10-25
Filing date: 2002-10-25
Publication date: 2003-05-07
Anticipated expiration: 2022-10-25
Also published as: CN1296309C

Abstract

A cordierite kiln furniture is preparedf rom superfine silicone powder, super fine alumina powder, fine magnesium oxide powder, calcined kaolinite powder, refractory powder containing MgO, Al2O3 and SiO2, mullite, andalusite, silicon carbonide, disperser and water through preparing grout, moulding, laying aside, curing, demoulding, and calcining at 1200-1380 deg.c. Its advantages are high strength and high qualified rate (more than 95%).

Description

The manufacture method of cordierite kiln ware

Technical field: the present invention relates to a kind of manufacture method of cordierite kiln ware, kiln furnitures are container or the delivery instrument that are used for firing ceramics utensil in kiln, belong to technical field of refractory materials.

Background technology: the classical production process of cordierite kiln ware, generally adopting talcum, clay, aluminum oxide and mullite synthesizing is raw material.Its forming method has three kinds: first kind is that above-mentioned raw materials is added suitable quantity of water and provisional wedding agent extrusion forming, sees Fig. 2; Second kind is to add big water gaging (20～30%) to form muddy, uses the plaster mould casting, referring to Fig. 3; The third is to add suitable quantity of water, forms plastic shape, uses the high pressure extruder for shaping, referring to Fig. 4; The shortcoming of above traditional technology is high tonnage press and the high pressure forcing machine that needs excellent property, and will drop into a large amount of moulds, and the facility investment volume is bigger, and particularly the large size refractory slab tends to be subjected to the restriction of press tonnage to be difficult to make; With the moulding of plaster mould slurry casting method, the production cycle is long, only limits to make some special shape goods (referring to Fig. 2,3,4).

Summary of the invention: the weak point that the present invention is directed to present cordierite kiln ware manufacture method, provide a kind of novel method of making cordierite kiln furniture through experimental study,, can form well-crystallized's trichroite with the product that this method is made, shorten the production cycle, improved product performance.The present invention is the dispersion-flocculation raw material that utilizes micro mist and super-fine powder, traditional raw material without cordierite matrix material is used magnesium oxide powder instead, silicon powder and alumina powder, and calcined kaolin is the matrix material, after adding paucidisperse agent and water, through stirring, acquisition has plasticity-, the slurry of flowability and ambient cure performance, forming method is shaped to sheet material or other special-shaped product thereby can adopt the vibration identical with cement concrete product, pour into a mould, smear etc., and this method is named and is CASM method (Castabe Methed).

Details are as follows for present method (can referring to accompanying drawing 1):

(1) starting material:

1. the ingredient requirement of used matrix material is as follows:

1) magnesium oxide powder, MgO content should be greater than 80%, fineness, 320 mesh screen residues＜10%;

2) silicon powder: SiO ₂Content is greater than 85%, diameter D in the particle ₅₀＜0.5 μ m;

3) alumina powder: Al ₂O ₃Content is greater than 85%, diameter D in the particle ₅₀＜2 μ m;

4) calcined kaolin: Al ₂O ₃Content should be 35～55%, fineness 320 mesh screen residues＜10%;

That 5) adjusts that composition uses contains MgO, Al ₂O ₃, SiO ₂Fire-resistant powder, as peridotites, spinel, burnt talcum, chlorite, serpentine, attaclay.

2. the dispersion agent of batching usefulness is Sodium hexametaphosphate 99, tripoly phosphate sodium STPP, sodium polyacrylate, tartrate, citric acid, naphthalenesulfonate.

3. refractory aggregate is mullite (Al ₂O ₃Content is 43～75%), andaluzite, synthesis of dichroite grog, silication silicon.

4. tap water.

(2) proportion scale

Matrix material weight proportion is:

1. silicon powder is 10～25 parts

2. alumina powder is 0～10 part

3. the magnesia fine powder is 2～15 parts

4. the calcined kaolin powder is 50～70 parts

5. adjust composition with containing MgO, Al ₂O ₃, SiO ₂0～20 part in fire-resistant powder

The base aggregate: the matrix material is 30～70: 70～30 (weight parts)

It is 0.1～1.0 part that dispersion agent adds weight

(3) operation steps:

1. take by weighing the matrix material by above-mentioned part by weight, aggregate and dispersion agent are put into the stirrer thorough mixing, add suitable quantity of water, are formed with certain mobile visco-plastic body after fully stirring.

Available three kinds of forming method moulding.

During 1) with the casting moulding, can make slurry have good flowability, be convenient to directly pour in the pre-designed mould, be full of the space of mould by regulating dispersion agent and moisture content.

During 2) with the vibrating casting moulding, the slurry that modulates in advance can be poured in the mould, be placed on the bumper or and shake tamper or flat-plate vibrator,, make slurry be full of the interior space of mould by vibrations with insert.

During 3) with the streak method moulding, can adjust slurry by dispersion agent and water consumption and make and form mobile relatively poor and visco-plasticity slurry preferably, smear into different shape by mould.

2. with the goods of forming, through leaving standstill and maintenance, get final product setting and harden voluntarily, treat that intensity reaches when can the demoulding moving, goods are taken out in the demoulding, and this moment, goods had certain intensity, with its calcining kiln of packing into 1200 ℃～1380 ℃ temperature, calcine in oxidizing atmosphere or the neutral atmosphere, to obtain to contain the cordierite kiln ware of best trichroite in conjunction with phase.

More than used calcining kiln, can be shuttle kiln, tunnel furnace, down-draft kiln or rolling tunnel kiln.

The present invention compares with traditional technology, has the following advantages:

1. save facility investment greatly.

2. can moulding arbitrary shape and relatively large sheet material, die cost is lower.

3. do not need to set up drying plant, drying is carried out with burning till together.

4. work in-process have intensity preferably, are convenient to carrying, and loading of kiln reduces breakage rate, and qualification rate can improve more than 95%.

Description of drawings:

Fig. 1 is a process flow sheet of the present invention

The mechanical pressing technical process of Fig. 2 correlation technique

The casting moulding process flow process of Fig. 3 correlation technique

The extruding-out process flow process of Fig. 4 correlation technique

Embodiment:

Embodiment 1:

54 parts of mullite particle material 0～3mm (weight)

5 parts of magnesia fine powders (weight)

7 parts of ultrafine silica powders (weight)

30 parts of calcined kaolin fine powders (weight)

4 parts in the refractory materials (weight) that contains magnesium 30%

0.24 part of dispersion agent (weight)

6.8 parts in water (weight)

Through 1300～1350 ℃ burn till after, it is as follows to measure performance:

Folding strength 22MPA under the normal temperature

1250 ℃ of hot modulus of rupture 11MPA

Embodiment 2:

54 parts of siliceous particulate material 0～3mm of mullite and carbonization (weight)

4 parts of magnesia fine powders (weight)

4 parts of alumina powders (weight)

6 parts of silicon powders (weight)

32 parts in calcined kaolin powder (weight)

0.24 part of dispersion agent (weight)

6.8 parts in water (weight)

Through 1300～1380 ℃ burn till after, it is as follows to measure performance:

Folding strength 18MPA under the normal temperature

1280 ℃ of hot modulus of rupture 14MPA

Embodiment 3:

15 parts of mullite grog 0～3mm (weight)

15 parts of mullite 0～1mm (weight)

20 parts of 1～3mm (weight)

7 parts of ultrafine silica powders (weight)

5 parts of magnesia fine powders (weight)

10 parts of alumina powders (weight)

28 parts of calcined kaolin fine powders (weight)

0.24 part of dispersion agent (weight)

7 parts in water (weight)

Through 1200～1320 ℃ burn till after, it is as follows to measure performance:

Folding strength 18MPA under the normal temperature

1200 ℃ of hot modulus of rupture 14MPA

Embodiment 4:

54 parts in silicon-carbide particle material (weight)

6 parts of ultrafine silica powders (weight)

4 parts of magnesia fine powders (weight)

4 parts of alumina powders (weight)

32 parts of calcined kaolin fine powders (weight)

0.24 part of dispersion agent (weight)

6.8 parts in water (weight)

Strength at normal temperature 26MPA

Claims

1. the manufacture method of a cordierite kiln ware is characterized in that: mainly with silicon powder, alumina powder, magnesium oxide powder, the calcined kaolin powder and adjust that composition uses contain MgO, Al ₂O ₃, SiO ₂The fire-resistant fine powder of composition is the matrix material; With mullite, andaluzite, silicon carbide is that aggregate is formulated;

(1) to raw-material technical requirements be:

Magnesium oxide powder, MgO content wherein should be greater than 80%, and its fineness requirement is passed through 320 mesh screen residues less than 10;

Silicon powder: SiO ₂Content is greater than 85%, diameter D in the particle ₅₀＜0.5 μ m;

Alumina powder: Al ₂O ₃Content is greater than 85%, diameter D in the particle ₅₀＜2 μ m;

Calcined kaolin: Al ₂O ₃Content should be 35～55%, and fineness requirement is passed through 320 mesh screen residues less than 10%;

That adjusts that composition uses contains MgO, Al ₂O ₃, SiO ₂Fire-resistant powder; Can be peridotites, spinel, burnt talcum, chlorite, serpentine, attaclay;

Refractory aggregate mullite, andaluzite, synthesis of dichroite grog, silication silicon;

Dispersion agent Sodium hexametaphosphate 99, tripoly phosphate sodium STPP, sodium polyacrylate, tartrate, citric acid, naphthalenesulfonate;

(2) proportion scale

1) matrix material weight proportion is:

10～20 parts of silicon powders

0～10 part of aluminum oxide differential

2～15 parts of magnesia fine powders

50～70 parts in calcined kaolin powder

Contain MgO, Al ₂O ₃, SiO ₂Adjust composition with 0～20 part in fire-resistant powder

2) part by weight of aggregate add-on and matrix material add-on is an aggregate: the matrix material is 30～70: 70～30;

3) dispersion agent adding weight is 0.1～1.0 part

(3) operation steps:

1) take by weighing the matrix material by above-mentioned part by weight, aggregate and dispersion agent are put into the stirrer thorough mixing, add suitable quantity of water, after fully stirring, be made into slurry and pour the goods that die for molding is a different shape into, through leaving standstill and maintenance, treat that intensity reaches when can the demoulding moving, goods are taken out in the demoulding;

2) goods after the demoulding are packed into calcining kiln is calcined 1200 ℃～1380 ℃ temperature.

2. the manufacture method of cordierite kiln ware according to claim 1 is characterized in that described forming method, and casting, streak method or lash method are arranged.

3. according to the manufacture method of the described cordierite kiln ware of claim, it is characterized in that described calcining kiln is shuttle kiln, tunnel furnace, down-draft kiln or roller kiln.