CN101386545B - Method for improving light-weight refractory brick mechanical property - Google Patents
Method for improving light-weight refractory brick mechanical property Download PDFInfo
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- CN101386545B CN101386545B CN2008101973830A CN200810197383A CN101386545B CN 101386545 B CN101386545 B CN 101386545B CN 2008101973830 A CN2008101973830 A CN 2008101973830A CN 200810197383 A CN200810197383 A CN 200810197383A CN 101386545 B CN101386545 B CN 101386545B
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Abstract
The invention relates to a method for improving the mechanical properties of lightweight refractory bricks. The method comprises the following steps that a lightweight refractory brick is immersed in organosilicon solution for 2 to 5 hours; the lightweight refractory brick is taken out and put into an oven to be cured for 2 to 5 hours at a temperature of between 200 and 250 DEG C, so as to obtain a composite brick body of organosilicon and the refractory brick; the composite brick body is put into an atmosphere furnace so as to be subjected to thermal cracking for 1 to 3 hours at a temperature of between 800 and 1300 DEG C, and then is cooled to room temperature, so as to obtain a modified lightweight refractory brick; and the whole thermal cracking and cooling process is carried out under the protection of a reducing atmosphere or an inert atmosphere. Compared with the prior art, the method mainly has the following remarkable advantages that the method hardly changes the porosity or refractoriness of the lightweight refractory brick during modification but can improve the compressive strength of the lightweight refractory brick by 50 to 150 percent, and has the advantages of simple process, easy adjustment and control, good repeatability, low cost and the like.
Description
Technical field
The present invention relates to the field of improving light fire brick surface property and mechanical property, when realizing not changing light fire brick void content and refractoriness, its ultimate compression strength is improved 50～150%.
Background technology
Light fire brick claims insulating fire brick again, is the void content height, volume density is low, thermal conductivity is low refractory materials, be characterized in having vesicular structure (void content general 40%～85%) and high thermal insulation.Light fire brick comprises light weeight alumina brick, lightweight corundum brick, lightweight trichroite brick, light weight fireclay brick, light silicious brick, light hollow ball product etc., usually as Industrial Stoves furnace insulation material, it can alleviate the body of heater quality, simplify furnace construction, reduce fuel consumption, also help to realize being rapidly heated and cooling off of kiln, improve production efficiency of equipment, its production cost is low simultaneously, makes light fire brick in this field irreplaceable status be arranged.But the light fire brick void content is higher, tissue looseness, mechanical property is low, wears no resistance, and can not be used for load larrying member, anti-simultaneously slag can be poor, when directly contacting with furnace charge, slag can very fast intrusion brick body pore in, make it cracked.When reducing the void content of refractory brick, its mechanical strength can increase to some extent, but its thermal conductivity also can increase, and heat-insulating property descends, and therefore, is not changing the prerequisite system of refractory brick void content, and the mechanical strength that improves light fire brick has realistic meaning.
Organosilicon is to be main chain with Si-O-Si, in the high temperature inert environment, can be transformed into the amorphous pottery of the good C-Si-O of ablation resistance by the cracking of side chain and the rearrangement of main chain, extensively applying to fields such as Aeronautics and Astronautics and military affairs, is the low-cost desirable precursor of making high performance ceramic material.But organosilicon from organic to the inorganic ceramic transition process, follow quality to reduce and the density increase, volumetric shrinkage must take place, show as cracking, make the amorphous pottery of cracked C-Si-O no longer have mechanical strength.Plus fiber or micro mist in organosilicon, can significantly restrict the volumetric shrinkage of organosilicon when Pintsch process, be called Continuous Fiber Reinforced Ceramic Matrix Composites (CFR-CMCs) and particle and strengthen ceramic matric composite (PR-CMCs), these two technology are all quite ripe both at home and abroad, the basic thought of the two all is to prevent the cracking of organosilicon in cracking process, utilizes the amorphous pottery of split product C-Si-O good anti-ablation and mechanical property.Because organosilicon belongs to organic polymer, have good fluidity, convenient formation, and structure, component such as can design at characteristics, therefore in recent years, domestic and international many scholars are being devoted to the research that organosilicon is done the bonding special-shaped ceramics block of binding agent, after organosilicon is dispersed in the ceramic body adhesive surface and forms film, control certain temperature rise rate, can realize that cracking can not appear in silicone resin when cracking, its split product firmly is bonded to ceramic block with the effect of ceramic surface generation chemical bonding.
By discovering, when organosilicon is impregnated in the light fire brick, make after the art breading that pottery connects of being similar to organosilicon, can realize that also organosilicon does not ftracture when inorganic from organic being transformed in the high temperature inert environment, and the amorphous pottery of a small amount of C-Si-O that cracking produces is attached to lightweight refractory pore structure inwall, repaired the tiny crack on its skeleton, its mechanical strength is increased greatly, and the existence of simultaneously a small amount of amorphous pottery of C-Si-O is quite little to the influence of light fire brick void content.
New result shows to looking into of domestic and international patent and document: also do not use organosilicon light fire brick to be carried out the research report of mechanics modification.
Summary of the invention
Technical problem to be solved by this invention is: a kind of more easy method is provided, carries out modification and handle on common light-weight refractory brick foundation, do not change refractory brick void content and refractoriness, improve a kind of new technology of light fire brick mechanical strength greatly.The modified technique that uses is that light fire brick is flooded a small amount of organosilicon, controls the subsequent heat treatment process system then and realizes improving the refractory brick mechanical strength.
The technical scheme that the present invention solves its technical problem is: light fire brick is immersed in the organic silicon solution, and dipping time is 2～5 hours; Take out light fire brick and put into the composite brick body that baking oven curing obtains organosilicon and refractory brick, solidification value is 200～250 ℃, and be 2～5 hours set time; Again described composite brick body is put into the atmosphere furnace thermo-cracking, the thermo-cracking temperature is 800～1300 ℃, and the thermo-cracking time is 1～3 hour, is cooled to room temperature then and obtains described modified and light refractory brick; Whole thermo-cracking and temperature-fall period carry out under the atmosphere protection of nitrogen or argon gas or ammonia.
The present invention compared with prior art mainly contains following significant effect:
In modifying process, can change the void content and the refractoriness of light fire brick hardly, but its ultimate compression strength can improve 50～150%.And it is simple to have technology, easily regulates and controls, favorable repeatability and low cost and other advantages.
Description of drawings
Fig. 1 is the SEM figure before the modification of lightweight cordierite refractory brick.
Fig. 2 is the SEM figure of (1200 ℃ of thermal treatment) after the modification of lightweight cordierite refractory brick.
Embodiment
The method of improvement light-weight refractory brick mechanical property provided by the invention, specifically: light fire brick is immersed in the organic silicon solution, and dipping time is 2～5 hours.Take out light fire brick and put into baking oven and solidify the composite brick body that obtains organosilicon and refractory brick, setting up period rises to 200～250 ℃ from room temperature with 0.5～2 ℃/minute temperature rise rate, and is incubated 2～5 hours.Again described composite brick body is put into the atmosphere furnace thermo-cracking, during the thermo-cracking, rise to 800～1300 ℃ from room temperature with 2～5 ℃/minute temperature rise rate, and be incubated 1～3 hour, at last reduce to room temperature, obtain described modified and light refractory brick with 5 ℃/minute rate of temperature fall.Whole thermo-cracking and temperature-fall period carry out under the atmosphere protection of nitrogen or argon gas or ammonia.
Described organic silicon solution is that organosilicon is dissolved in the homogeneous solution that is prepared from organic solvent-acetone or Virahol or the toluene, and to regulate its viscosity be 1～100mPas.This organic silicon solution, it can be cross-linked into solid in 200～250 ℃ of air, when being heated to 800～1300 ℃, still have 40～95% mass excess.
Described light fire brick is light weeight alumina brick, lightweight corundum brick, lightweight trichroite brick, light weight fireclay brick or light silicious brick, and they can be Any shape and size, have the connection pore, and void content is 40～90%, and the aperture is 10～2000 μ m.
The invention will be further described below in conjunction with embodiment, but do not limit the present invention.
Specific examples 1
1. with lightweight cordierite refractory brick (density 0.52g/cm
3, void content 70.5%, the about 0.3mm in aperture) be immersed in silicone resin SAR-9 (Shanghai Resin Factory produces, and colourless homogeneous transparent liquid, solvent are toluene, solid content 51%, viscosity is in 8～35mPas), dipping time is 3 hours.
2. take out lightweight cordierite refractory brick and put into baking oven, rise to 200 ℃ with 1 ℃/minute temperature rise rate, and be incubated 5 hours, obtain organosilicon and light fire brick composite brick body.
With organosilicon and light fire brick composite brick body at nitrogen (N
2) under the atmosphere, rise to 800,1000,1200,1300 ℃ and be incubated 1 hour respectively with 2 ℃/minute temperature rise rates, reduce to room temperature with 5 ℃/minute rate of temperature fall again, obtain described modified and light refractory brick, its test result sees Table 1.
As shown in Table 1: after the modification, the void content of lightweight trichroite brick changes and is not obvious, and its mechanical property is significantly improved, and the amplification of ultimate compression strength is between 30～105%, when thermal treatment temp during, help the modification of lightweight cordierite refractory brick mechanical strength most at 1200 ℃.In addition, the refractory brick of the light fire brick after this modification before modification is placed in 1450 ℃ of air ambients, does not all occur caving in, show that this modifying process does not influence the refractoriness of refractory brick.
The SEM picture of thermal treatment temp lightweight cordierite refractory bricks before and after 1200 ℃ of modifications is as shown in Figure 2: the introducing of silicone resin does not have the pore texture of remarkably influenced refractory brick as can be seen, but the tiny crack around its hole is repaired (seeing Fig. 2 mark), thereby increased the mechanical strength of refractory brick.
Specific examples 2
1. with lightweight alumina firebrick (density 1.04g/cm
3, void content 58.2%, the about 0.2mm in aperture) be immersed in silicone resin SAR-9 (Shanghai Resin Factory produces, and colourless homogeneous transparent liquid, solvent are toluene, solid content 51%, viscosity is in 8～35mPas), dipping time is 3 hours.
2. take out the lightweight alumina firebrick and put into baking oven, rise to 200 ℃ with 1 ℃/minute temperature rise rate, and be incubated 4 hours, obtain organosilicon and light fire brick composite brick body.
With organosilicon and light fire brick composite brick body at nitrogen (N
2) under the atmosphere, rise to 1200 ℃ and be incubated 1 hour with 2 ℃/minute temperature rise rates, reduce to room temperature with 5 ℃/minute rate of temperature fall again, obtain described modified and light refractory brick.
After the modification, its ultimate compression strength increases to 4.6MPa from originally 3.1MPa, and intensity has increased 50%.Void content 58.2% becomes 56.4% after the modification before the modification, and density is from modification 1.04g/cm before
3Become modification 1.18g/cm afterwards
3In addition, the refractory brick of the light fire brick after this modification before modification is placed in 1600 ℃ of air ambients, does not all occur caving in, show that this modifying process does not influence the refractoriness of refractory brick.
Specific examples 3
1. with silicone resin (the silicone resin SR249 of Dow corning company) and acetone thorough mixing, regulate viscosity to 35～65mPas, again with lightweight cordierite refractory brick (density 0.52g/cm
3, void content 70.5%, the about 0.3mm in aperture) be immersed in this liquid, dipping time is 5 hours.
2. take out lightweight cordierite refractory brick and put into baking oven, rise to 250 ℃ with 0.5 ℃/minute temperature rise rate, and be incubated 2.5 hours, obtain organosilicon and light fire brick composite brick body.
With organosilicon and light fire brick composite brick body at nitrogen (N
2) under the atmosphere, rise to 1200 ℃ and be incubated 3 hours with 2 ℃/minute temperature rise rates, reduce to room temperature with 5 ℃/minute rate of temperature fall again, obtain described modified and light refractory brick.
After the modification, its ultimate compression strength increases to 4.1MPa from originally 1.9MPa, and intensity has increased 116%.Void content 70.5% becomes 66.8% after the modification before the modification, and density is from modification 0.54g/cm before
3Become modification 0.72g/cm afterwards
3In addition, the refractory brick of the light fire brick after this modification before modification is placed in 1450 ℃ of air ambients, does not all occur caving in, show that this modifying process does not influence the refractoriness of refractory brick.
Specific examples 4
1. with light weight fireclay brick (density 0.92g/cm
3, void content 62.5%, the about 0.05mm in aperture) be immersed in silicone resin SAR-9 (Shanghai Resin Factory produces, and colourless homogeneous transparent liquid, solvent are toluene, solid content 51%, viscosity is in 8～35mPas), dipping time is 3 hours.
2. take out light weight fireclay brick and put into baking oven, rise to 200 ℃ with 1 ℃/minute temperature rise rate, and be incubated 4 hours, obtain organosilicon and light fire brick composite brick body.
With organosilicon and light weight fireclay brick composite brick body under argon gas (Ar) atmosphere, rise to 1200 ℃ and be incubated 1 hour with 5 ℃/minute temperature rise rates, reduce to room temperature with 5 ℃/minute rate of temperature fall again, obtain described modified and light refractory brick.
After the modification, its ultimate compression strength increases to 5.4MPa from originally 3.9MPa, and intensity has increased 38.5%.Void content 62.5% becomes 60.0% after the modification before the modification, and density is from modification 0.92g/cm before
3Become modification 1.09g/cm afterwards
3In addition, the refractory brick of the light weight fireclay brick after this modification before modification is placed in 1150 ℃ of air ambients, does not all occur caving in, show that this modifying process does not influence the refractoriness of refractory brick.
Specific examples 5
1. with light silicious brick (density 1.02g/cm
3, void content 65.4%, the about 0.1mm in aperture) be immersed in silicone resin SAR-9 (Shanghai Resin Factory produces, and colourless homogeneous transparent liquid, solvent are toluene, solid content 51%, viscosity is in 8～35mPas), dipping time is 3 hours.
2. take out light silicious brick and put into baking oven, rise to 200 ℃ with 1 ℃/minute temperature rise rate, and be incubated 4 hours, obtain organosilicon and light fire brick composite brick body.
With organosilicon and light fire brick composite brick body under argon gas (Ar) atmosphere, rise to 1200 ℃ and be incubated 1 hour with 5 ℃/minute temperature rise rates, reduce to room temperature with 5 ℃/minute rate of temperature fall again, obtain described modified and light refractory brick.
After the modification, its ultimate compression strength increases to 3.2MPa from originally 2.2MPa, and intensity has increased 46%.Void content 65.4% becomes 61.8% after the modification before the modification, and density is from modification 1.02g/cm before
3Become modification 1.26g/cm afterwards
3In addition, the refractory brick of the light fire brick after this modification before modification is placed in 1200 ℃ of air ambients, does not all occur caving in, show that this modifying process does not influence the refractoriness of refractory brick.
Specific examples 6
1. with silicone resin (the silicone resin SR249 of Dow corning company) and Virahol thorough mixing, regulate viscosity to 60～100mPas, again with light-weight mullite refractory brick (density 0.50g/cm
3, void content 72.5%, the about 0.4mm in aperture) be immersed in this liquid, dipping time is 4 hours.
2. take out light-weight mullite refractory brick and put into baking oven, rise to 250 ℃ with 0.5 ℃/minute temperature rise rate, and be incubated 5 hours, obtain organosilicon and light fire brick composite brick body.
With organosilicon and light fire brick composite brick body at ammonia (NH
3) under the atmosphere, rise to 1200 ℃ and be incubated 3 hours with 2 ℃/minute temperature rise rates, reduce to room temperature with 5 ℃/minute rate of temperature fall again, obtain described modified and light refractory brick.
After the modification, its ultimate compression strength increases to 3.6MPa from originally 1.5MPa, and intensity has increased 125%.Void content 72.5% becomes 64.8% after the modification before the modification, and density is from modification 0.52g/cm before
3Become modification 0.74g/cm afterwards
3In addition, the refractory brick of the light fire brick after this modification before modification is placed in 1450 ℃ of air ambients, does not all occur caving in, show that this modifying process does not influence the refractoriness of refractory brick.
Specific examples 7
1. with silicone resin (the silicone resin SR249 of Dow corning company) and Virahol thorough mixing, regulate viscosity to 60～100mPas, again with light-weight mullite refractory brick (density 0.50g/cm
3, void content 72.5%, the about 0.4mm in aperture) be immersed in this liquid, dipping time is 4 hours.
2. take out light-weight mullite refractory brick and put into baking oven, rise to 250 ℃ with 0.5 ℃/minute temperature rise rate, and be incubated 5 hours, obtain organosilicon and light fire brick composite brick body.
With organosilicon and light fire brick composite brick body under argon gas (Ar) atmosphere, rise to 1200 ℃ and be incubated 1 hour with 5 ℃/minute temperature rise rates, reduce to room temperature with 5 ℃/minute rate of temperature fall again, obtain described modified and light refractory brick.
After the modification, its ultimate compression strength increases to 2.8MPa from originally 1.5MPa, and intensity has increased 86.6%.Void content 72.5% becomes 65.9% after the modification before the modification, and density is from modification 0.52g/cm before
3Become modification 0.71g/cm afterwards
3In addition, the refractory brick of the light fire brick after this modification before modification is placed in 1450 ℃ of air ambients, does not all occur caving in, show that this modifying process does not influence the refractoriness of refractory brick.
The The performance test results of the foregoing description 2 to 7 is described in relevant paragraph, so not tabulation.
Subordinate list
The performance test of silicone resin modified and light cordierite refractory brick under the table 1 different heat treatment temperature
| Thermal treatment temp (℃) | Ultimate compression strength (MPa) | Amplification (%) | Density (g/cm 3) | Void content (%) |
| Before the modification | 1.93(±0.55) | / | 0.54 | 70.5 |
| 800℃ | 2.52(±0.50) | 31.3 | 0.69 | 69.8 |
| 1000℃ | 3.33(±0.32) | 72.5 | 0.65 | 69.6 |
| 1200℃ | 3.95(±0.38) | 105.7 | 0.65 | 68.6 |
| 1300℃ | 2.41(±0.19) | 24.9 | 0.62 | 68.1 |
Claims (5)
1. method of improving light-weight refractory brick mechanical property, it is characterized in that: light fire brick is immersed in the organic silicon solution, dipping time is 2～5 hours, this organic silicon solution is that organosilicon is dissolved in the homogeneous solution that is prepared in organic solvent-acetone or Virahol or the toluene, and to regulate its viscosity be 1～100mPas; Take out light fire brick and put into the composite brick body that baking oven curing obtains organosilicon and refractory brick, solidification value is 200～250 ℃, and be 2～5 hours set time; Again described composite brick body is put into the atmosphere furnace thermo-cracking, rise to 800～1300 ℃ from room temperature with 2～5 ℃/minute temperature rise rate, the thermo-cracking time is 1～3 hour, reduces to room temperature with 5 ℃ of/minute rate of temperature fall then and obtains described modified and light refractory brick; Whole thermo-cracking and temperature-fall period carry out under reducing atmosphere or inert atmosphere protection.
2. the method for improvement light-weight refractory brick mechanical property according to claim 1 is characterized in that: described light fire brick is light weeight alumina brick, lightweight corundum brick, lightweight trichroite brick, light weight fireclay brick or light silicious brick.
3. the method for improvement light-weight refractory brick mechanical property according to claim 1 is characterized in that: cure stage in baking oven rises to 200～250 ℃ from room temperature with 0.5～2 ℃/minute temperature rise rate.
4. the method for improvement light-weight refractory brick mechanical property according to claim 1 is characterized in that: reducing atmosphere is an ammonia.
5. the method for improvement light-weight refractory brick mechanical property according to claim 1 is characterized in that: inert atmosphere is nitrogen or argon gas.
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| CN101723693B (en) * | 2009-12-15 | 2012-12-05 | 宜兴市恒祥耐火材料有限公司 | Method for improving mechanical performance and thermal shock resistance of compact heavy refractory product |
| CN106518114B (en) * | 2016-11-15 | 2019-03-19 | 淄博工陶耐火材料有限公司 | The manufacture craft of ultralow-porosity, low thermal expansion fireclay refractory |
| CN107602155B (en) * | 2017-10-12 | 2019-07-12 | 中冶建筑研究总院有限公司 | A kind of preparation and application of anti-sticking slag refractory material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1164518A (en) * | 1996-09-17 | 1997-11-12 | 董宽志 | Formula of caustic dolomite sand tar refractory brick and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1164518A (en) * | 1996-09-17 | 1997-11-12 | 董宽志 | Formula of caustic dolomite sand tar refractory brick and its production method |
Non-Patent Citations (1)
| Title |
|---|
| 倪文等.改进刚玉－莫来石轻质耐火砖性能研究.《耐火材料》.2000,第34卷(第4期),200-202. * |
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