CN105669244A - Cordierite-mullite kiln furniture material with high thermal shock resistance - Google Patents

Cordierite-mullite kiln furniture material with high thermal shock resistance Download PDF

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Publication number
CN105669244A
CN105669244A CN201610053165.4A CN201610053165A CN105669244A CN 105669244 A CN105669244 A CN 105669244A CN 201610053165 A CN201610053165 A CN 201610053165A CN 105669244 A CN105669244 A CN 105669244A
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cordierite
mullite
kiln furniture
kiln
clay
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夏霞云
钱玉良
汪崇富
张卫国
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Tianjin creation heat conduction material Co., Ltd.
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BEIJING TREND INDUSTRIAL CERAMICS Co Ltd
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    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C04B35/185Mullite 3Al2O3-2SiO2
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    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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    • C04B35/18Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C04B35/195Alkaline earth aluminosilicates, e.g. cordierite or anorthite
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    • C04B35/66Monolithic refractories or refractory mortars, including those whether or not containing clay
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    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427Silicates other than clay, e.g. water glass
    • C04B2235/3436Alkaline earth metal silicates, e.g. barium silicate
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    • C04B2235/9607Thermal properties, e.g. thermal expansion coefficient

Abstract

The invention relates to a cordierite-mullite kiln furniture material with high thermal shock resistance and belongs to the field of the kiln furniture material. According to the kiln furniture material, floating beads, cordierite clinker, cordierite-mullite waste blanks, chamotte clay and wood meal are taken as aggregate, talc, aluminum oxide and clay are taken as a substrate material, a solid substance of the kiln furniture material is prepared from the aggregate, the substrate material and an additive yellow dextrin, water is added to the solid substance and is stirred, and a mixture is formed. After optimization, the requirement that the final composition is consistent with the composition of the cordierite-mullite kiln furniture material in the market is met, and the firing temperatures also keep consistent; the material has the advantages that the expansion factor is low, the number of thermal shock times is large, the volume density is low and the strength is high, and the material is suitable for being used as the excellent cordierite-mullite kiln furniture material with high thermal shock resistance.

Description

High-heat resistance shock resistant cordierite-mullite kiln furniture materials
Technical field
The present invention relates to a kind of kiln furniture material, particularly relate to a kind of high-heat resistance shock resistant cordierite-mullite kiln furniture materials.
Background technology
As being used for supporting the kiln furnitures of burnt product, it is desirable to can constantly stand rapid heat cycle, that is thermal shock resistance to be got well, and also to have the feature that energy consumption is low. Constantly trying out through numerous producers, cordierite kiln ware demonstrates the advantage of its uniqueness gradually. Cordierite is the mineral that in the silicate mineral that oneself knows now, thermal coefficient of expansion is minimum, thus the goods being principal crystalline phase with cordierite all have the performance of good resistance to rapid heat cycle, but its resistance to elevated temperatures of only single cordierite material is poor, refractoriness is low, it is necessary to composite mullite crystalline phase realizes the compound high-quality performance that high temperature resistant cold-hot impacts.
But, owing to manufacturer is different, result of use seems different to dichroite-mullite matter kiln furnitures on the market now. Having the dichroite-mullite lightweight refracrory of relatively low thermel expansion coefficient will make furnace lining or kiln furnitures have longer service life for periodic kilns the kiln or the kiln furnitures of frequent heating, cooling. But quick rapid heat cycle under the inapplicable condition of high temperature of dichroite-mullite, in general dichroite-mullite material kiln furnitures are usually used in 1250 degree of variations in temperature to room temperature more than 4 hours period circulations, and for needing less than the quick rapid heat cycle of 4 hours or even 1 hours cycle, kiln furniture material is easy to cracking damage occur, and the life-span is very short.
Summary of the invention
For the deficiency in above-mentioned field, the present invention provides a kind of high-heat resistance shock resistant cordierite-mullite kiln furniture materials, this material has the crystal phase structure of dichroite-mullite kiln furnitures, but is amenable to quick rapid heat cycle, it is adaptable to as the kiln furniture material of fast-firing kilm.
This material is used for making kiln furnitures, easy-formation, and green strength is higher, and other performance of kiln furnitures differs with existing dichroite-mullite kiln furnitures performance on the market and is as good as.
High-heat resistance shock resistant cordierite-mullite kiln furniture materials, its solids forms and percentage composition is:
Cordierite is somehow 15-25%, dichroite-mullite kiln furnitures scrap body material 18-28%, floating bead 8-15%, Talcum 10-20%, aluminium oxide 5-10%, clay 21-30%, grog 10-15%, yellow starch gum 0.2-0.4%, wood powder 2-5%; Add water and stir into compound.
Described water content is the 7-8.5% of solids weight.
Preferred: cordierite somehow 20%, dichroite-mullite kiln furnitures scrap body material 20%, floating bead 10%, Talcum 10%, aluminium oxide 5%, clay 23%, grog 10%, wood powder 2%, yellow starch gum 0.3%; Water content is the 8% of solid contents.
Preferred: described clay is mild-clay, described grog adopt Kaolin or hard paste is finely ground, homogenizing, filter-press dehydration, dry, finally calcine in kiln and form.
The technique that kiln furnitures prepared into by this material:
1) batch mixing: add water after being dry mixed together 5-8 minute by solids wet mixing 8-10 minute, first mixes, then through kolleroang mixed grind in high-speed mixer;
2) ageing mixture: the raw material mixed loads hopper room temperature and preserves, and could use after the ageing mixture time is not less than 24 hours;
3) molding: single or double shaped by fluid pressure, according to required product size size, calculates the size of mould according to the expansion rate of this material 0.5%, and briquetting pressure is 160 200kgf/cm2;
4) protection is sealed dry: be 60-95% in humidity, the closed chamber inner drying at temperature 40-70 DEG C 16-24 hour, then be 30-60% in humidity, temperature is closed chamber inner drying at 110 DEG C-150 DEG C 24-36 hour;
5) fire: base substrate, through the high-temperature firing of 1320-1380 DEG C, is incubated 5-10 hour.
Described protection dries the dry holder of employing and supports, and described dry holder is that fence type closes plate face, and described plate face is more than billet surface.
Described barrier pitch is 50-100mm.
Said method obtains the high-heat resistance shock resistant dichroite-mullite kiln furniture product of function admirable.
The present invention with cordierite somehow, dichroite-mullite kiln furnitures scrap body material, floating bead, grog, wood powder is as aggregate, with Talcum, aluminium oxide, clay is the solids that substrate material has been made into the kiln furniture material of the present invention together with additive yellow starch gum, add water and stir into mixture, wherein floating bead, it it is light material, hollow own, make product mesopore rate high, body is close little, additionally, wood powder can vapor away after high-temperature firing, form more gap structure, the thermal shock resistance making product improves, simultaneously by cordierite somehow wait addition, product is made after burning till, to form cordierite crystalline phase more, because the coefficient of expansion of cordierite is very low, there is excellent resistance to thermal shock stability, it is achieved in that the performance of high-heat resistance shock resistant. in whole proportioning, it is achieved that the requirement that final composition is consistent with cordierite-mullite kiln furniture materials on market, firing temperature also maintains unanimously, and properties of product keep excellent, are not less than the dichroite-mullite raw material on existing market.
Floating bead is a kind of fly ash hollow ball that can bubble through the water column, and in canescence, the thin hollow of wall, very light in weight, thermal conductivity is little, refractoriness >=1610 DEG C, is excellent heat insulating refractory material, is widely used in production and the oil drilling aspect of lightening casting material. The chemical analysis of floating bead is based on silicon dioxide and aluminium sesquioxide, there is the several functions such as granule is thin, hollow, light weight, high-strength, wear-resisting, high temperature resistant, insulation insulation, flame-resistant insulation, now it is widely used to one of raw material for refractory, this formula forms for aggregate, there is lightweight and drop low-expansion advantage.
Cordierite, somehow be the refractory material that the coefficient of expansion is very low, is widely used in the fire-resistant field that resistance to rapid heat cycle needs, and as important aggregate composition in this formula, has the reduction coefficient of expansion, the advantage improving goods thermal shock resistance.
Dichroite-mullite kiln furnitures scrap body material, it is mainly the compound phase of cordierite and mullite, there is good low-expansion coefficient and resistance to elevated temperatures, again waste material is recycled simultaneously, reduce production cost, as important aggregate composition in this proportioning, serve high temperature resistant, improve intensity, and ensure the effect of the excellent thermal shock resistance of goods.
The powder that timber breaks into, wood powder, generally refers to Furniture Factory, density board factory, the multi-layer sheet factory timber remaining leftover bits of processing. Wood powder is of many uses, is novel energy-saving environment-friendly raw material. Can as the raw material of the multiple products such as mosquito incense, leather, clothing, papermaking, electrical equipment, the articles for daily use, coating, cat litter, chemical industry, insulant, exterior decorative materials, construction material, in general, wood powder both functions as filler, wood powder meeting in the process of high-temperature firing is flammable and vapors away, form more gap structure, the product coefficient of expansion is made to decline, it is achieved the advantage of high-heat resistance shock resistant.
Grog can be divided into two types: one is directly calcined in kiln by hard paste block and obtain; Another kind of is adopt Kaolin or hard paste (hard kaoline), finely ground, homogenizing, filter-press dehydration, dry, finally calcine in kiln and form, be high-quality grog, also referred to as low aluminum-containing mullite grog, also have and be called calcined kaolin. This proportioning middle finger is exactly the second grog, plays a small amount of aggregate and the effect of mullite crystalline phase in this proportioning, improves the high-temperature behavior of goods.
The kind of clay is a lot, by plasticity, clay can be divided into mild-clay (strong fat clay), semisoft clay (middle fat clay), hard paste (weak fat clay). Referring to the mild-clay that plasticity is strong in this proportioning, its main chemical compositions is SiO2、Al2O3And water of crystallization, this proportioning provides the composition of needs, all raw materials bonding is got up simultaneously, obtain the good mixed material of plasticity, improve the intensity of green compact.
Yellow starch gum is widely used in the industries such as grinding tool abrasive material, foundry casting, refractory material and rubber, especially uses at grinding tool abrasive material and refractory material, fire-resistant furnace charge, light-weight brick, special shaped brick etc., the initial stage shape of its product is had excellent effect, by suitable proportioning, it is blended into, stirs, in moulding, to preventing from subsiding, conformal guarantor is stupefied fabulous effect, acts the effect linking agent in this formula, processability is better, green strength is higher, not cracky, it is simple to operative.
In the process preparing goods, needing the process through ageing mixture to use after batch mixing, ageing mixture is the process of an old homogenizing, makes overall compound more uniform, and density and the plasticity of material are better, it is easier to compressing, improve the intensity of green compact.
Owing to, in sintering procedure, raw material has contraction or dilatancy, it is therefore desirable to calculate consumption, for instance during molding, goods need length to be 400mm, then die size is that 400/ (1+0.5%)=398mm. briquetting pressure is according to 160 200kgf/cm2It is pressed, obtains body close for 1.5--1.8g/cm3Product, according to demand and determine. In forming process, uniformity wanted by cloth, it is impossible to local has material many or expects few phenomenon, and the local volume causing whole goods is close inconsistent, and product local weak link in use easily occurs and damaged.
Owing to base substrate is before entering klining system, it is necessary to dry through overprotection, as improper in protection drying condition, easily cause this kiln furnitures product and deform, ftracture. As dry too fast, dehydration is too fast, easily makes base substrate crackle occur, affects work efficiency slowly as dried, if dry not thorough, when firing, blank moisture is big, and in sintering procedure, refractory slab is easy to crack. If do not detect the bending of ejecting plate face when protecting dry, again owing to the flexibility of each thin plate is different, bending position is different, and clipping easily causes thin plate bending place cracking when founding code, therefore protect dry condition extremely important.
Protection is base substrate is placed in dry holder above support time dry, and its plate face should be greater than base substrate, and flatness is good, otherwise easily causes the periphery out-of-flatness of base substrate, and dry holder closes plate face for fence type, is beneficial to moisture loss, the preferred 50-100mm of interval of grid strip. Too wide, base substrate easily caves at fence gap location, and spacing is too little, is unfavorable for moisture loss.
During high-temperature firing, base substrate, through the high temperature of 1320-1380 DEG C, is incubated the high-heat resistance shock resistant dichroite-mullite kiln furniture product obtaining function admirable for 5-10 hour, it is possible to adopts the vertical code peace code two ways of clipping to carry out setting and burns till.
The vertical code of clipping is to pile up product with fitting strip by one to clamp, and puts into kiln and fires, it is therefore prevented that deform at sintering procedure product in the way of vertical code. The preferred 100-200mm of thickness of one pile product, too thin, base substrate number is few, and operating efficiency is low, and deformation probability is big, too thick, easily causes raw burn. When clipping founds code, plummet and horizon rule detect its flatness. Base substrate after molding need to detect the uniformity of its degree of compaction, the place that degree of compaction is bad, namely the weak link in plate face, easy to crack in follow-up dry, sintering procedure, deformation. All these detection meanss are all prevent underproof product from flowing into next program, in order to avoid producing the wasting of resources.
Flat code burns till, it is desirable to have the significantly high backing plate of flatness supports, and backing plate plate face can not less than the plate face size of burnt product, and the height of flat code product is not above 100mm.
This kiln furniture material, in its forming process, green strength is higher, adapts to remove and unload, generally somewhat any material of lightweight, and mechanical pressing difficulty, green strength is low, it is impossible to removes and unloads.
The kiln furnitures properties of product that said method prepares: body is close: 1.5--1.8g/cm3; Normal temperature strength: 10-18Mpa; The coefficient of expansion (1000 DEG C): 1.9 2.3 (x10-6K-1); Thermal shock number of times (1000 DEG C insulation 30 minutes after water-cooled): >=40 times; Refractoriness: 1400 DEG C. This material coefficient of expansion is low, and often, bulk density is light in thermal shock, and intensity is high, is suitable for as kiln furniture material.
The oikocryst item of this high-heat resistance shock resistant cordierite-mullite kiln furniture materials is cordierite and mullite, consisting of of final products: Al2O3: 32-45%; SiO2: 45-55%; MgO:6-9.5%.
Accompanying drawing explanation
Fig. 1. brilliant item picture
Fig. 2 .X-optical diffraction analysis collection of illustrative plates.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Formula: cordierite somehow 20%, dichroite-mullite kiln furnitures scrap body material 20%, floating bead 10%, Talcum 10%, aluminium oxide 5%, clay 23%, grog 10%, wood powder 2%, additional yellow starch gum 0.3%.
Batch mixing: by above-mentioned technique, in the ratio external adding water of 8% (solid contents is benchmark), prepares compound, seals ageing mixture 24 hours.
Molding: one side shaped by fluid pressure, uses 180KGF/CM2Pressure carry out molding, obtain the solid refractory slab green compact of 398*398*14.9mm, green compact hands can be moved, very solid.
Dry: to be dried by above-mentioned technique.
Burn till: 6 piece of one pile rearing in tunnel cave, at 1370 DEG C, insulation is fired into the slab kiln of 400*400*15mm for 6 hours.
Inner construction analysis:
Fig. 1 crystalline substance item picture shows, acicular mullite crystalline substance item and cloud sheet shape cordierite crystalline substance item are well combined.
Fig. 2 is that x-ray diffraction analyzes collection of illustrative plates, and main brilliant item is cordierite and mullite crystalline substance item.
Show that the product that the present invention prepares is dichroite-mullite material.
Detection performance:
Above-mentioned data show, the dichroite-mullite article swells coefficient that the present invention prepares is low, and often, heat-resistant knocking stability is fine in thermal shock, and this material is suitable for using as kiln furnitures, is particularly suitable for the kiln furniture material of fast-firing kilm stove.

Claims (8)

1. high-heat resistance shock resistant cordierite-mullite kiln furniture materials, its solids forms and percentage composition is:
Cordierite somehow 15-25%, dichroite-mullite kiln furnitures scrap body material 18-28%, floating bead 8-15%, Talcum 10-20%, aluminium oxide 5-10%, clay 21-30%, clay is somehow 10-15%, yellow starch gum 0.2-0.4%, wood powder 2-5%; Add water and stir into compound.
2. kiln furniture material according to claim 1, described water content is the 7-8.5% of solids weight.
3. kiln furniture material according to claim 2, wherein solids consists of: cordierite somehow 20%, dichroite-mullite kiln furnitures scrap body material 20%, floating bead 10%, Talcum 10%, aluminium oxide 5%, clay 23%, clay somehow 10%, wood powder 2%, yellow starch gum 0.3%; Water content is the 8% of solid contents.
4. kiln furniture material according to claim 1, described clay is mild-clay, described grog adopt Kaolin or hard paste is finely ground, homogenizing, filter-press dehydration, dry, finally calcine in kiln and form.
5. the method that the arbitrary kiln furniture material of claim 1-4 prepares into kiln furnitures, comprises the steps:
1) batch mixing: add water after being dry mixed together 5-8 minute by solids wet mixing 8-10 minute, first mixes, then through kolleroang mixed grind in high-speed mixer;
2) ageing mixture: the raw material mixed loads hopper room temperature and preserves, and could use after the ageing mixture time is not less than 24 hours;
3) molding: single or double shaped by fluid pressure, according to required product size size, calculates the size of mould according to the expansion rate of this material about 0.5%, and briquetting pressure is 160 200kgf/cm2;
4) sealing protection dry: be 60-95% in closed chamber humidity, at temperature 40-70 DEG C dry 16-24 hour, then be 30-60% in humidity, temperature was at 110 DEG C-150 DEG C dry 24-36 hour;
5) fire: base substrate, through the high-temperature firing of 1320-1380 DEG C, is incubated 5-10 hour.
6. the method described in claim 5, described protection dries the dry holder of employing and supports, and described dry holder is that fence type closes plate face, and described plate face is more than billet surface.
7. the method described in claim 6, described barrier pitch is 50-100mm.
8. the high-heat resistance shock resistant dichroite-mullite kiln furniture product that claim 5-7 either method obtains.
CN201610053165.4A 2016-01-27 2016-01-27 Cordierite-mullite kiln furniture material with high thermal shock resistance Pending CN105669244A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107098688A (en) * 2017-03-16 2017-08-29 广东美的厨房电器制造有限公司 Ceramic fire cover and its processing method and gas-cooker
CN107151148A (en) * 2017-05-11 2017-09-12 焦作诺尔曼炉业有限公司 A kind of cordierite thermal insulation fire-resistant ball and preparation method thereof
CN108059450A (en) * 2017-12-26 2018-05-22 福建省德化县创捷窑具有限公司 A kind of environment-friendly type dichroite-mullite kiln furnitures and preparation method thereof
CN109095933A (en) * 2018-07-24 2018-12-28 广东金刚新材料有限公司 A kind of dedicated bending resistance ceramic rod of chilling band and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN107098688A (en) * 2017-03-16 2017-08-29 广东美的厨房电器制造有限公司 Ceramic fire cover and its processing method and gas-cooker
CN107098688B (en) * 2017-03-16 2019-11-01 广东美的厨房电器制造有限公司 Ceramic fire cover and its processing method and gas-cooker
CN107151148A (en) * 2017-05-11 2017-09-12 焦作诺尔曼炉业有限公司 A kind of cordierite thermal insulation fire-resistant ball and preparation method thereof
CN108059450A (en) * 2017-12-26 2018-05-22 福建省德化县创捷窑具有限公司 A kind of environment-friendly type dichroite-mullite kiln furnitures and preparation method thereof
CN108059450B (en) * 2017-12-26 2020-04-28 福建省德化县创捷窑具有限公司 Environment-friendly cordierite-mullite kiln furniture and manufacturing method thereof
CN109095933A (en) * 2018-07-24 2018-12-28 广东金刚新材料有限公司 A kind of dedicated bending resistance ceramic rod of chilling band and preparation method thereof
CN109095933B (en) * 2018-07-24 2021-06-11 广东金刚新材料有限公司 Bending-resistant ceramic roller rod special for quenching belt and preparation method thereof

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