CN102674861A - Refractory castable containing viscoplasticity phase and preparation method thereof - Google Patents
Refractory castable containing viscoplasticity phase and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a refractory castable containing viscoplasticity phase, comprising refractory aggregate, refractory fine powder, oxide fine powder, a bonding agent and an additive, wherein the granularity of the refractory aggregate is 1-8mm, the granularity of the refractory fine powder is 0.044-1mm, the granularity of the oxide fine powder is less than 5mum, and the granularity of the bonding agent is less than 0.088 mm. According to the invention, single-substance aluminum powder and single-substance silicon powder are added into the refractory castable; the single-substance silicon powder is liquefied or softened during the material sintering, so that the material can produce liquid-phase sintering at low temperature to improve the bonding strength; the introduced aluminum powder reacts with water to form Al(OH)3 and then forms Al2O3 with big activity after being heated and decomposed; the SiO2 and Al2O3 react to form needle/column-shaped mullite crystals, therefore strength of the castable is improved; and meanwhile, part silicon powder becomes viscoplasticity phase at high temperature, and disperses in the material, thus, the toughness of the material is improved and the thermal shock resistance of the castable is improved.
Description
Technical field
The present invention relates to a kind of unshape refractory, specifically a kind of refractory castable that contains the plasticity phase and preparation method thereof.
Background technology
Compare with qualitative refractory product; With the refractory castable be that the unshape refractory of representative has that technical process is short, production energy consumption and advantage such as cost is low, easy to use, applied widely, globality and result of use are good; Thereby worldwide obtained developing rapidly, its proportion shared in whole refractory materials is increasingly high.In the advanced country of some refractory technologies, the output of unshape refractory near in addition surpassed the output of setting goods.For example, the present Japanese unshape refractory output ratio that accounts for whole refractory materials has reached about 60%; The U.S. be about 50%; States such as English, moral, method are 40% ~ 50%.Nowadays, refractory castable has been widely used in the high temperature service of industrial circles such as metallurgy, building materials, electric power, chemical industry, for example, in the cement kiln system, has widely applied the refractory castable of various materials at present.
Performances such as the mechanical strength of refractory castable, wear resistance, resistance to fouling, heat-shock resistance have extremely important influence to operation factor, reduction energy consumption and the production cost that improves high temperature service.Yet the performance that is used for the refractory castable under some harsh working conditions at present can't satisfy request for utilization.For example; The mould material that is used for the preceding kilneye position of large-scale dry-process cement rotary kiln; Present ubiquitous problem is that huge thermal and mechanical stress destroys and the thermal shock damage because of atwirl high temperature kiln body produces; And large-tonnage high temperature chamotte wearing and tearing, cause the kilneye mould material to be prone to ftracture, peel off and denude damage.The mould material that is used for the cement kiln coal injection pipe position, ubiquitous problem also are washing away of Yin Gaowen thermal shock and a large amount of high temperature and high speed solid particulates, cause mould material to peel off and denude, and work-ing life is short.
As everyone knows, be related between the mechanical strength of material, Young's modulus and wear resistance and the heat-shock resistance.Usually, improve the intensity and the Young's modulus of material, can improve its wear resistance, but can make its heat-shock resistance variation.In addition, as a kind of ceramic, refractory castable (also comprising all refractory materialss) all shows very big fragility, very little toughness, and the most metal material is then opposite.Therefore, we can say that fragility is a key character of refractory materials, also is its weakness.The material that fragility is big, its anti-mechanical stress is impacted and the ability of heat-shock resistance (being that thermal stress resistance impacts) is all relatively poor, in case show as the critical stress effect that receives intuitively, material is easy to generate paroxysmal fracture or cracking destruction.
In recent years, though the scientific worker has carried out a few thing to the research of the toughness reinforcing refractory materials of metal, do not carry out, and all also be in the laboratory study stage to refractory castable.For example, people such as Xue Wendong studied in corundum-silicon nitride gas permeable brick, introduce massfraction be 5% with the elemental silicon of l0% to material structure and Effect on Performance.People such as Hong Yanruo, Tu Junbo has studied and under logical condition of nitrogen gas, has introduced elemental silicon, pure aluminum structure and the Effect on Performance to corundum-silicon nitride material.People such as Bu Jinglong have studied the effect of in corundum material, introducing metallic aluminium powder.People's such as Li Gaiye, Li Nan research an amount of interpolation silica flour to A1
20
3The influence of-SiC material oxidation-resistance.
Summary of the invention
For solving the problem that bigger, the anti-mechanical stress of existing refractory castable fragility is impacted and heat-shock resistance is relatively poor, duration of service is short, the invention provides a kind of refractory castable that contains the plasticity phase and preparation method thereof.
The present invention solves the problems of the technologies described above the technical scheme of employing to be: a kind of refractory castable that contains the plasticity phase; Form by refractory aggregate, fire-resistant fine powder, oxide micropowder, wedding agent and admixture; The granularity of refractory aggregate is 1-8mm; The granularity of fire-resistant fine powder is 0.044-1mm; The granularity of oxide micropowder is less than 5 μ m, and the granularity of wedding agent is less than 0.088mm, each composition by weight add-on be: refractory aggregate 45-60 part, fire-resistant fine powder 33-43 part, oxide micropowder 4-7 part, wedding agent 3-5 part, admixture 0.15-0.2 part;
Described admixture is made up of tripoly phosphate sodium STPP and Sodium hexametaphosphate 99, and the weight ratio of tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 is 0.8-1:1;
The plasticity phase fine powder that comprises 3-10 part in the described fire-resistant fine powder, this plasticity phase fine powder is made up of metallic aluminium powder of 1-3 part and the simple substance silica flour of 2-8 part;
Among the present invention, comprise the aquamaine stone flour of 3-5 part in the described fire-resistant fine powder;
Described oxide micropowder is made up of ultrafine silica powder of 2-6 part and the alumina powder of 1-4 part;
Silica content is 97.5% in the described ultrafine silica powder, and the content of aluminum oxide is 98.7% in the said alumina powder;
Described wedding agent is salic 70% aluminous cement;
The preparation method that this kind contains the refractory castable of plasticity phase is to comprise following steps:
1) material chooses
Choose the raw material of above-mentioned suitable particle diameter respectively: the main body refractory raw material is chosen two types of the fire-resistant fine powders that refractory aggregate that particle diameter is 1-8mm and particle diameter be 0.044-1mm; The particle diameter of aquamaine stone flour, metallic aluminium powder and simple substance silica flour is 0.044-0.15mm; Alumina powder and ultrafine silica powder are less than 5 μ m; Aluminous cement is less than 0.088mm, and each material is subsequent use after choosing and accomplishing;
2) preparation of fire-resistant fine powder
The preparation of plasticity phase fine powder
According to weight ratio, get metallic aluminium powder and simple substance silica flour and mix and be mixed with the plasticity fine powder mutually that gross weight is 3-10 part, wherein metallic aluminium powder is 1-3 part, the simple substance silica flour is 2-8 part;
The particle diameter that then the plasticity phase fine powder for preparing is joined aquamaine stone flour and 18-37 part of 3-5 part is in other fire-resistant fine powders of 0.044-1mm and mixes, and makes the fire-resistant fine powder mixture that contains the plasticity phase, and is subsequent use;
3) preparation of refractory castable
Taking by weighing step 1, to choose the particle diameter of 45-60 part of completion be the refractory aggregate of 1-8mm; Oxide micropowder, the aluminous cement of 3-5 part and the tripoly phosphate sodium STPP and the Sodium hexametaphosphate 99 mixture of 0.15-0.2 part of the 4-7 part that is added in fire-resistant fine powder mixture that step 2 makes then successively, chooses in step 1; After thorough mixing is even, promptly make finished product.
The refractory castable that the present invention makes adds the cleaning water of its weight 5-7% in use in refractory castable, get final product casting after stirring.
Among the present invention, refractory aggregate is chosen one or more in the conventional aggregates such as electrofused mullite, sub-white corundum, brown corundum, plate diamond spar, high grade bauxite grog, spinel.
The high-strength refractory mould material that contains the plasticity phase has very high mechanical strength, good thermal shock resistance and wearability; And resistance to elevated temperatures is good; Long service life is obvious to operation factor, reduction refractory consumption rate, reduction energy consumption and the production cost effect that improves high temperature service.Its principle of design has been used for reference " transition plasticity phase technology (Transient Plastic Phase Process) " thought; Through introducing an amount of plasticity phase (silica flour and aluminium powder); Liquefy easily or remollescent character in the material sintering process by silica flour on the one hand; Impel material under lower temperature, to produce liquid phase sintering, improve the bonding strength of material; On the other hand, a part of plasticity phase (the especially plasticity phase at material surface position) will be participated in reaction and generated nonmetal wild phase.Specifically with regard to the present invention, a part of silica flour in the mould material can be oxidized to SiO
2, the aluminium powder introduced forms Al (OH) with the water reaction earlier
3, decomposes forms active bigger Al then
2O
3, SiO then
2And Al
2O
3Reaction forms the mullite crystal of pin, column, thereby improves the intensity of mould material.In addition, the part silica flour of material internal still keeps its original attribute, and under the condition of high temperature, becomes the visco-plasticity phase, and disperse is distributed in the material, improves the toughness of material, improves the heat-shock resistance of mould material.
Beneficial effect: the present invention has added simple substance aluminium powder and simple substance silica flour in refractory castable; A part of simple substance silica flour in the mould material liquefies or remollescent character in the material sintering process easily; Impel material under lower temperature, to produce liquid phase sintering; Improve the bonding strength of material, a part of silica flour can be oxidized to SiO
2The aluminium powder of introducing forms Al (OH) with the water reaction earlier
3, decomposes forms active bigger Al then
2O
3, SiO then
2And Al
2O
3Reaction forms the mullite crystal of pin, column, thereby improves the intensity of mould material; Simultaneously, the part silica flour of material internal still keeps its original attribute, and under the condition of high temperature, becomes the visco-plasticity phase, and disperse is distributed in the material, improves the toughness of material, improves the heat-shock resistance of mould material.
Description of drawings
Fig. 1 is the performance comparison table of the made finished product of various embodiments of the present invention.
Embodiment
Below in conjunction with specific embodiment the present invention is done further elaboration.
Embodiment 1
A kind of preparation method who contains the refractory castable of plasticity phase comprises following steps:
1) material chooses
Choose the raw material of suitable particle diameter respectively, comprise high grade bauxite grog particle, mullite particle, white fused alumina fine powder, high grade bauxite fine powder, mullite fine powder, aquamaine stone flour, metallic aluminium powder, simple substance silica flour, alumina powder, ultrafine silica powder and aluminous cement etc.Each material particular diameter of choosing is: high grade bauxite grog particle and mullite particle are 1-8mm; High grade bauxite fine powder, mullite fine powder and white fused alumina fine powder are 0.044-1mm; The particle diameter of aquamaine stone flour, metallic aluminium powder and simple substance silica flour is 0.044-0.15mm; Alumina powder and ultrafine silica powder are less than 5 microns, and aluminous cement is less than 0.088mm, and each material is subsequent use after choosing and accomplishing;
2) preparation of fire-resistant fine powder
The preparation of plasticity phase fine powder
According to weight ratio, get metallic aluminium powder and simple substance silica flour and mix and be mixed with the plasticity fine powder mutually that gross weight is 3kg, wherein the weight of metallic aluminium powder is within 1-3kg, and the weight of simple substance silica flour is within 2-8kg;
The particle diameter that then the plasticity phase fine powder of the 3kg for preparing is joined aquamaine stone flour and the 37kg of 3kg is in other fire-resistant fine powders of 0.044-1mm and mixes, and makes the fire-resistant fine powder mixture that contains the plasticity phase, and is subsequent use;
Wherein, the particle diameter of described 37kg is the consisting of of other fire-resistant fine powders of 0.044-1mm: mullite fine powder 15kg, high grade bauxite fine powder 12kg, white fused alumina fine powder 10kg;
3) preparation of refractory castable
Taking by weighing the particle diameter of choosing the 45kg of completion in step 1 is the refractory aggregate of 1-8mm; Oxide micropowder, the aluminous cement of 5kg and tripoly phosphate sodium STPP and the Sodium hexametaphosphate 99 mixture of 0.2kg of the 7kg that adds the fire-resistant fine powder mixture that makes by step 2 then successively, chooses by step 1; After thorough mixing is even, promptly make finished product;
Wherein, described particle diameter is the consisting of of refractory aggregate of 1-8mm: high grade bauxite grog particle 30kg, mullite particle 15kg;
The alumina powder of consisting of of described oxide micropowder: 1kg and the ultrafine silica powder of 6kg;
The weight ratio of described tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 is 0.8:1.
Embodiment 2
A kind of preparation method who contains the refractory castable of plasticity phase comprises following steps:
1) material chooses
Choose the raw material of suitable particle diameter respectively; Comprise high grade bauxite grog particle, mullite particle, white fused alumina fine powder, high grade bauxite fine powder, mullite fine powder, aquamaine stone flour, metallic aluminium powder, simple substance silica flour, alumina powder, ultrafine silica powder and aluminous cement; Each material particular diameter of choosing is: high grade bauxite grog particle and mullite particle are 1-8mm; High grade bauxite fine powder, mullite fine powder and white fused alumina fine powder are 0.044-1mm, and the particle diameter of aquamaine stone flour, metallic aluminium powder and simple substance silica flour is 0.044-0.15mm, and alumina powder and ultrafine silica powder are less than 5 microns; Aluminous cement is less than 0.088mm, and each material is subsequent use after choosing and accomplishing;
2) preparation of fire-resistant fine powder
The preparation of plasticity phase fine powder
According to weight ratio, get metallic aluminium powder and simple substance silica flour and mix and be mixed with the plasticity fine powder mutually that gross weight is 7kg, wherein the weight of metallic aluminium powder is within 1-3kg, and the weight of simple substance silica flour is within 2-8kg;
Then the plasticity phase fine powder of the 7kg for preparing is joined the aquamaine stone flour of 4kg and the particle diameter of 28kg is in other fire-resistant fine powders of 0.044-1mm and mixes, make the fire-resistant fine powder mixture that contains the plasticity phase, subsequent use;
Wherein, the particle diameter of described 28kg is the consisting of of other fire-resistant fine powders of 0.044-1mm: mullite fine powder 10kg, high grade bauxite fine powder 9kg, white fused alumina fine powder 9kg;
3) preparation of refractory castable
Taking by weighing the particle diameter of choosing the 52kg of completion in step 1 is the refractory aggregate of 1-8mm; Oxide micropowder, the aluminous cement of 4kg and tripoly phosphate sodium STPP and the Sodium hexametaphosphate 99 mixture of 0.17kg of the 5kg that adds the fire-resistant fine powder mixture that makes by step 2 then successively, chooses by step 1; After thorough mixing is even, promptly make finished product;
Wherein, described particle diameter is the consisting of of refractory aggregate of 1-8mm: white fused alumina particle 35kg, mullite particle 17kg;
The alumina powder of consisting of of described oxide micropowder: 2kg and the ultrafine silica powder of 3kg;
The weight ratio of described tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 is 1:1.
Embodiment 3
A kind of preparation method who contains the refractory castable of plasticity phase comprises following steps:
1) material chooses
Choose the raw material of suitable particle diameter respectively; Comprise high grade bauxite grog particle, white fused alumina particle, white fused alumina fine powder, high grade bauxite fine powder, aquamaine stone flour, metallic aluminium powder, simple substance silica flour, alumina powder, ultrafine silica powder and aluminous cement; Each material particular diameter of choosing is: high grade bauxite grog particle and mullite particle are 1-8mm; High grade bauxite grog particle, mullite particle and white fused alumina fine powder are 0.044-1mm, and the particle diameter of aquamaine stone flour, metallic aluminium powder and simple substance silica flour is 0.044-0.15mm, and alumina powder and ultrafine silica powder are less than 5 microns; Aluminous cement is less than 0.088mm, and each material is subsequent use after choosing and accomplishing;
2) preparation of fire-resistant fine powder
The preparation of plasticity phase fine powder
According to weight ratio, get metallic aluminium powder and simple substance silica flour and mix and be mixed with the plasticity fine powder mutually that gross weight is 10kg, wherein the weight of metallic aluminium powder is within 1-3kg, and the weight of simple substance silica flour is within 2-8kg;
The particle diameter that then the plasticity phase fine powder of the 10kg for preparing is joined aquamaine stone flour and the 18kg of 5kg is in other fire-resistant fine powders of 0.044-1mm and mixes, and makes the fire-resistant fine powder mixture that contains the plasticity phase, and is subsequent use;
Wherein, described particle diameter is the consisting of of refractory aggregate of 0.044-1mm: high grade bauxite fine powder 6kg, white fused alumina fine powder 12kg;
3) preparation of refractory castable
Taking by weighing the particle diameter of choosing the 60kg of completion in step 1 is the refractory aggregate of 1-8mm; Oxide micropowder, the aluminous cement of 3kg and tripoly phosphate sodium STPP and the Sodium hexametaphosphate 99 mixture of 0.15kg of the 4kg that adds the fire-resistant fine powder mixture that makes by step 2 then successively, chooses by step 1; After thorough mixing is even, promptly make finished product;
Wherein, described particle diameter is the consisting of of refractory aggregate of 1-8mm: high grade bauxite grog particle 35kg, white fused alumina particle 25kg;
The alumina powder of consisting of of described oxide micropowder: 2kg and the ultrafine silica powder of 2kg;
The weight ratio of described tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 is 1.2:1.
Claims (6)
1. refractory castable that contains the plasticity phase; Form by refractory aggregate, fire-resistant fine powder, oxide micropowder, wedding agent and admixture; It is characterized by: the granularity of refractory aggregate is 1-8mm, and the granularity of fire-resistant fine powder is 0.044-1mm, and the granularity of oxide micropowder is less than 5 μ m; The granularity of wedding agent is less than 0.088mm, each composition by weight add-on be: refractory aggregate 45-60 part, fire-resistant fine powder 33-43 part, oxide micropowder 4-7 part, wedding agent 3-5 part, admixture 0.15-0.2 part;
Described admixture is made up of tripoly phosphate sodium STPP and Sodium hexametaphosphate 99, and the weight ratio of tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 is 0.8-1:1;
The plasticity phase fine powder that comprises 3-10 part in the described fire-resistant fine powder, this plasticity phase fine powder is made up of metallic aluminium powder of 1-3 part and the simple substance silica flour of 2-8 part.
2. a kind of refractory castable that contains the plasticity phase according to claim 1 is characterized by: the aquamaine stone flour that comprises 3-5 part in the described fire-resistant fine powder.
3. a kind of refractory castable that contains the plasticity phase according to claim 1 is characterized by: described oxide micropowder is made up of ultrafine silica powder of 2-6 part and the alumina powder of 1-4 part.
4. a kind of refractory castable that contains the plasticity phase according to claim 3 is characterized by: silica content is 97.5% in the described ultrafine silica powder, and the content of aluminum oxide is 98.7% in the said alumina powder.
5. a kind of refractory castable that contains the plasticity phase according to claim 1 is characterized by: described wedding agent is salic 70% aluminous cement.
6. a preparation method who contains the refractory castable of plasticity phase is characterized in that, comprises following steps:
1) material chooses
Choose the suitable raw material of above-mentioned particle diameter respectively; Each material particular diameter of choosing is: the main body refractory raw material is chosen two types of the refractory aggregate fine powders that refractory aggregate that particle diameter is 1-8mm and particle diameter be 0.044-1mm; The particle diameter of aquamaine stone flour, metallic aluminium powder and simple substance silica flour is 0.044-0.15mm; Alumina powder and ultrafine silica powder are less than 5 μ m, and aluminous cement is less than 0.088mm, and each material is subsequent use after choosing and accomplishing;
2) preparation of fire-resistant fine powder
The preparation of plasticity phase fine powder
According to weight ratio, get metallic aluminium powder and simple substance silica flour and mix and be mixed with the plasticity fine powder mutually that gross weight is 3-10 part, wherein metallic aluminium powder is 1-3 part, the simple substance silica flour is 2-8 part;
The particle diameter that then the plasticity phase fine powder for preparing is joined aquamaine stone flour and 18-37 part of 3-5 part is in other fire-resistant fine powders of 0.044-1mm and mixes, and promptly makes the fire-resistant fine powder mixture that contains the plasticity phase, and is subsequent use;
3) preparation of refractory castable
Taking by weighing the particle diameter of choosing 45-60 part of completion in step 1 is the refractory aggregate of 1-8mm; Oxide micropowder, the aluminous cement of 3-5 part and the tripoly phosphate sodium STPP and the Sodium hexametaphosphate 99 mixture of 0.15-0.2 part of the 4-7 part that is added in fire-resistant fine powder mixture that step 2 makes then successively, chooses in step 1; After thorough mixing is even, promptly make finished product.
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| CN106278307A (en) * | 2016-08-01 | 2017-01-04 | 万燕杰 | A kind of high-performance refractory castable |
| CN106316420A (en) * | 2016-08-01 | 2017-01-11 | 张婷 | Smelter castable |
| CN106083108A (en) * | 2016-08-01 | 2016-11-09 | 万燕杰 | A kind of high-temperature wearable composite casting material |
| CN106220202A (en) * | 2016-08-01 | 2016-12-14 | 张婷 | A kind of Zirconium corundum refractory castable |
| CN106278306A (en) * | 2016-08-01 | 2017-01-04 | 万燕杰 | A kind of wear-resisting anti-erosion castable |
| CN106278305A (en) * | 2016-08-01 | 2017-01-04 | 万燕杰 | A kind of aluminum-titanate-based castable refractory |
| CN106045543A (en) * | 2016-08-01 | 2016-10-26 | 万燕杰 | High-strength and wear-resisting castable |
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| CN111718203B (en) * | 2020-07-28 | 2022-08-19 | 中国一冶集团有限公司 | Refractory castable for converter sublance and preparation method thereof |
| CN113416067A (en) * | 2021-06-15 | 2021-09-21 | 武汉钢铁有限公司 | Anti-oxidation impact-resistant castable for ladle, preparation method and ladle |
| CN114933483A (en) * | 2022-06-28 | 2022-08-23 | 武汉钢铁有限公司 | 3D printing material, 3D printing product, refractory and preparation method thereof |
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