CN101880171B - Preparation method of molten steel dispersion centrifugal disc - Google Patents
Preparation method of molten steel dispersion centrifugal disc Download PDFInfo
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- CN101880171B CN101880171B CN2010102064033A CN201010206403A CN101880171B CN 101880171 B CN101880171 B CN 101880171B CN 2010102064033 A CN2010102064033 A CN 2010102064033A CN 201010206403 A CN201010206403 A CN 201010206403A CN 101880171 B CN101880171 B CN 101880171B
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Abstract
The invention provides a preparation method of a molten steel dispersion centrifugal disc, which is characterized by comprising the following steps of firstly, preparing materials in percentage by weight: 4-5 percent of Al2O3 ultrafine powder, 6-7 percent of binder, 8-10 percent of zircon sand, 7-8 percent of silica sand and the balance of white corundum; secondly, premixing the Al2O3 ultrafine powder, the zircon sands and the silica sands based on the proportion in the step one; thirdly, putting the white corundum into a mixer, adding 70 percent binder in a spraying mode, adding premixed powder obtained in the step two and the residual binder in the spraying mode after stirring for a period of time, and preparing pug by fully mixing; fourthly, pressing the pug by utilizing a model and preparing a dispersion centrifugal disc mud model; and fifthly, drying and sintering the dispersion centrifugal disc mud model and obtaining the molten steel dispersion centrifugal disc. In the premise without obvious enhancement of production cost, the prepared centrifugal disc has the advantages of high refractoriness, good refractoriness under load, good high temperature volume stability, good thermal shock resistance and excellent working performance.
Description
Technical field
The present invention provides a kind of preparation method of molten steel dispersion centrifugal disc, belongs to the Materials Processing Engineering technical field.
Background technology
Shot is mainly used in descaling and the processing of rust removing before the iron and steel parts application, relates to various fields such as aviation, automobile, shipbuilding.The most frequently used shot working method is gunite and centrifuging.Gunite is to make metal liquid stream under the High-Pressure Water effect, be broken into the drop moulding; Centrifuging is that liquid metal is cast on the centrifugal pan of telling rotation, under action of centrifugal force, is broken into the drop moulding.Compare with gunite, do not contact with water in the molten metal dispersion process when becoming ball owing to centrifuging, the size-grade distribution of shot, hollow rate, roundness, as cast condition and leading indicators such as heat treatment state microstructure and performance are significantly improved.Therefore, for the higher shot of specification of quality, generally adopt centrifuging to produce.
When centrifuging was produced shot, the melting capacity of melting equipment had directly determined shot output.At present, most domestic enterprises adopt induction furnace, and its melting capacity is at 300～800kg.If can improve the smelting capacity (reaching 10 tons or higher) of equipment, can significantly improve shot output, and then improve economic benefit of enterprises.At this moment, become the key factor of production process the work-ing life of dispersion centrifugal disc.In the pouring metal melt process, centrifugal pan also will bear thermal shocking simultaneously bearing pyritous, very easily cracks in the military service process, and then causes cracking, fragmentation.The centrifugal pan that adopts traditional refractory materials to process; Be difficult to its continuous work-ing life surpass 10min, and smelting capacity is 7 tons a electric furnace, is approximately 15min the duration of pouring of every stove molten steel; Because the problem in work-ing life of centrifugal pan causes the interruption of pouring molten steel process, can produce great waste.Therefore, the raising in centrifugal pan work-ing life becomes the bottleneck that shot output promotes.External part enterprise uses the main material of high-purity zirconia as rotating disk, can make centrifugal pan accumulative total in work-ing life reach 50min, but its high cost (being more than 20 times of common refractory centrifugal pan) makes many enterprises hang back.
Therefore, in this field, seek that a kind of cost is cheap relatively, to satisfy the centrifugal pan production technology that requires in continuous work-ing life again be problem demanding prompt solution.
Summary of the invention
The object of the present invention is to provide a kind ofly can address the above problem, with low cost, can satisfy the preparation method of molten steel dispersion centrifugal disc that require continuous work-ing life again.Its technical scheme is:
A kind of preparation method of molten steel dispersion centrifugal disc is characterized in that adopting following steps: 1) get the raw materials ready, according to Al
2O
3Super-fine powder 4～5%, sticker 6～7%, zircon sand 8～10%, silica sand 7～8%, all the other get the raw materials ready for the weight percent of white fused alumina; 2) according to ratio described in the step 1) with Al
2O
3Super-fine powder, zircon sand and silica sand carry out pre-mixing; 3) white fused alumina is put into stirrer, adds 70% of whole weight of binder with spray pattern again, add step 2 with spray pattern after stirring for some time) premix powders and the remaining sticker that obtain, thorough mixing makes pug; 4) utilize mould compacting pug, make dispersion centrifugal disc mud mould; 5) dispersion centrifugal disc mud mould is carried out drying and sintering, promptly get molten steel dispersion centrifugal disc.
Described preparation method of molten steel dispersion centrifugal disc, in the step 1), Al in the white fused alumina
2O
3Weight percent be not less than 98.5%, Na
2O is not more than 0.7%; White fused alumina particle 100% is through No. 6 sieves, has 80% white fused alumina particle at least through No. 8 sieves, and the particle weight through No. 10 sieves is not no less than 45%; Through No. 12 the sieve particle weight be not no less than 70%, through No. 14 the sieve particle weight be at most 3%.
Described preparation method of molten steel dispersion centrifugal disc, in the step 1), Al
2O
3The divided by maximum granularity of super-fine powder is less than 1 μ m; Sticker employing weight percent concentration is 30～40% aluminium phosphate aqueous solution; ZrO in the zircon sand
2With HfO
2The weight percent sum greater than 65.00%, SiO
2Weight percent less than 33.00%, size-grade distribution satisfies that 0.053mm～0.106mm particulate weight percent content is greater than 75%, the peak value massfraction is greater than 30%; The silica sand composition satisfies SiO
2Weight percent content is greater than 96%, and the weight percent of silt content is less than 0.5%, and divided by maximum granularity is less than 0.1mm.
Described preparation method of molten steel dispersion centrifugal disc; In step 3); White fused alumina is put into stirrer, divide 3～4 times with spray pattern adding sticker, the weight of binder of adding accounts for 70% of sticker gross weight; Mix and adopt the sprinkle mode to add good powder of premix and remaining sticker again about 3min, make pug behind mixing 20～25min.
Described preparation method of molten steel dispersion centrifugal disc, in the step 4), the forming pressure of mud mould is controlled at 100～120MPa, and the dwell time is 3～5min.
Described preparation method of molten steel dispersion centrifugal disc; In the step 5); The mud mould that step 4) is made under 60～70 ℃ of conditions dry 12～14 hours continued under 90～120 ℃ of conditions dry 48～50 hours subsequently, at last dried mud mould was put into sintering oven sintering 10～12 hours under 1680～1750 ℃ of conditions; And furnace cooling, promptly get molten steel dispersion centrifugal disc.
The present invention compared with prior art has the following advantages:
(1) on the basis of continuing to use traditional high alumina refractory preparation technology; Optimize material formula; Do not have at production cost under the prerequisite of obvious raising, prepared centrifugal pan has high refractoriness, good refractoriness under load, high volume stability, thermal shock resistance and good slag resistance.
(2) utilize the prepared dispersion centrifugal disc of the present invention to carry out molten steel when cast, but about non-stop run 30min and tangible cracking phenomena do not occur, be 5～6 times of common high-alumina refractory material centrifugal pan work-ing life.
Embodiment
In following examples, Al in the white fused alumina
2O
3Weight percent be not less than 98.5%, Na
2O is not more than 0.7%; White fused alumina particle 100% is through No. 6 sieves, has 80% white fused alumina particle at least through No. 8 sieves, and the particle weight through No. 10 sieves is not no less than 45%; Through No. 12 the sieve particle weight be not no less than 70%, through No. 14 the sieve particle weight be at most 3%; Al
2O
3The divided by maximum granularity of super-fine powder is less than 1 μ m; ZrO in the zircon sand
2With HfO
2The weight percent sum greater than 65.00%, SiO
2Weight percent less than 33.00%, size-grade distribution satisfies that 0.053mm～0.106mm particulate weight percent content is greater than 75%, the peak value massfraction is greater than 30%; The silica sand composition satisfies SiO
2Weight percent content is greater than 96%, and the weight percent of silt content is less than 0.5%, and divided by maximum granularity is less than 0.1mm.
Embodiment 1, and making step is:
1) get the raw materials ready, by weight percentage, Al
2O
3Super-fine powder 4%, phosphagel phosphaljel 6%, zircon sand 8%, silica sand 7%, all the other are white fused alumina, and it is 30% aqueous solution that phosphagel phosphaljel is configured to weight percent concentration.
2) according to ratio described in the step 1) with Al
2O
3Super-fine powder, zircon sand and silica sand carry out pre-mixing;
3) white fused alumina is put into stirrer, divides 3 times with spray pattern and add 70% of whole weight of binder, add step 2 with spray pattern after stirring 3min) premix powders and the remaining sticker that obtain, thorough mixing 25min makes pug;
4) utilize mould compacting pug, mud mold forming pressure 100MPa, the dwell time is 5min, makes dispersion centrifugal disc mud mould;
5) with mud mould under 60 ℃ of conditions dry 14 hours, under 90 ℃ of conditions, continued dry 50 hours subsequently, at last dried mud mould is put into sintering oven sintering 12 hours under 1680 ℃ of conditions, and furnace cooling, molten steel dispersion centrifugal disc promptly got.
Embodiment 2, and making step is:
1) get the raw materials ready, by weight percentage, Al
2O
3Super-fine powder 5%, phosphagel phosphaljel 7%, zircon sand 10%, silica sand 8%, all the other are white fused alumina, and it is 40% aqueous solution that phosphagel phosphaljel is configured to weight percent concentration.
2) according to ratio described in the step 1) with Al
2O
3Super-fine powder, zircon sand and silica sand carry out pre-mixing;
3) white fused alumina is put into stirrer, divides 4 times with spray pattern and add 70% of whole weight of binder, add step 2 with spray pattern after stirring 5min) premix powders and the remaining sticker that obtain, thorough mixing 20min makes pug;
4) utilize mould compacting pug, mud mold forming pressure 120MPa, the dwell time is 3min, makes dispersion centrifugal disc mud mould;
5) with mud mould under 70 ℃ of conditions dry 12 hours, under 120 ℃ of conditions, continued dry 48 hours subsequently, at last dried mud mould is put into sintering oven sintering 10 hours under 1750 ℃ of conditions, and furnace cooling, molten steel dispersion centrifugal disc promptly got.
For the centrifugal pan that the present invention makes, select two comparing property of set condition tests for use: the one, utilize the centrifugal pan of room temperature state directly to cast; The 2nd, pour into a mould again after centrifugal pan is preheated to 500～550 ℃.
The centrifugal pan of directly pouring into a mould; After being fixed on the rotary table, starter motor is adjusted to 1700～1800rpm with the no-load speed of rotating disk, and adjustment electric furnace tundish (about 7 tons of molten steel weight) is to centrifugal pan; Open the bottom stopper and pour into a mould, the molten steel discharge is about 400kg/min; For the centrifugal pan of preheating, utilize resistance furnace to be preheated to 500～550 ℃, be incubated on every side and handle and lay temperature measuring equipment; Treat to pour molten steel into tundish after electrosmelting is accomplished; And be transported to the predetermined position through driving, and remove preheating unit, starter motor is adjusted to 1700～1800rpm with the no-load speed of rotating disk; The adjustment electric furnace is opened the bottom stopper and is poured into a mould to centrifugal pan; Behind each casting complete, whether the inspection centrifugal pan obvious crackle or serious erosion occur.
Observe to find that for preheating centrifugal pan not, slight erosion only can be observed in test specimen surface, cast back for the first time, does not have visual crackle and exists; For the second time after the cast, show at test specimen and to observe tangible crackle that maximum crackle width can reach 1mm, can't continue to use; The centrifugal pan of thermal pretreatment, the cast back can be observed obvious crackle on the test specimen surface for the third time, but its size is significantly less than not preheating centrifugal pan, the about 0.6mm of maximum crackle width; Above-mentioned experiment gross weight carries out 5 times again, and the gained result is similar.
Claims (3)
1. a preparation method of molten steel dispersion centrifugal disc is characterized in that adopting following steps: 1) get the raw materials ready, according to Al
2O
3Super-fine powder 4～5%, sticker 6～7%, zircon sand 8～10%, silica sand 7～8%, all the other get the raw materials ready for the weight percent of white fused alumina; 2) according to ratio described in the step 1) with Al
2O
3Super-fine powder, zircon sand and silica sand carry out pre-mixing; 3) white fused alumina is put into stirrer, adds 70% of whole weight of binder with spray pattern again, add step 2 with spray pattern after stirring for some time) premix powders and the remaining sticker that obtain, thorough mixing makes pug; 4) utilize mould compacting pug, make dispersion centrifugal disc mud mould; 5) dispersion centrifugal disc mud mould is carried out drying and sintering, promptly get molten steel dispersion centrifugal disc; Wherein:
In the step 1), Al in the white fused alumina
2O
3Weight percent be not less than 98.5%, Na
2O is not more than 0.7%; White fused alumina particle 100% is through No. 6 sieves, has 80% white fused alumina particle at least through No. 8 sieves, and the particle weight through No. 10 sieves is not no less than 45%; Through No. 12 the sieve particle weight be not no less than 70%, through No. 14 the sieve particle weight be at most 3%;
In the step 1), Al
2O
3The divided by maximum granularity of super-fine powder is less than 1 μ m; Sticker employing weight percent concentration is 30～40% aluminium phosphate aqueous solution; ZrO in the zircon sand
2With HfO
2The weight percent sum greater than 65.00%, SiO
2Weight percent less than 33.00%, size-grade distribution satisfies that 0.053mm～0.106mm particulate weight percent content is greater than 75%, the peak value massfraction is greater than 30%; The silica sand composition satisfies SiO
2Weight percent content is greater than 96%, and the weight percent of silt content is less than 0.5%, and divided by maximum granularity is less than 0.1mm;
In step 3); White fused alumina is put into stirrer, divide 3～4 times with spray pattern adding sticker, the weight of binder of adding accounts for 70% of sticker gross weight; Mix 3min and adopt the sprinkle mode to add good powder of premix and remaining sticker again, make pug behind mixing 20～25min.
2. preparation method of molten steel dispersion centrifugal disc as claimed in claim 1 is characterized in that: in the step 4), the forming pressure of mud mould is controlled at 100～120MPa, and the dwell time is 3～5min.
3. preparation method of molten steel dispersion centrifugal disc as claimed in claim 1; It is characterized in that: in the step 5); The mud mould that step 4) is made under 60～70 ℃ of conditions dry 12～14 hours continued under 90～120 ℃ of conditions dry 48～50 hours subsequently, at last dried mud mould was put into sintering oven sintering 10～12 hours under 1680～1750 ℃ of conditions; And furnace cooling, promptly get molten steel dispersion centrifugal disc.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102064033A CN101880171B (en) | 2010-06-23 | 2010-06-23 | Preparation method of molten steel dispersion centrifugal disc |
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|---|---|---|---|
| CN2010102064033A CN101880171B (en) | 2010-06-23 | 2010-06-23 | Preparation method of molten steel dispersion centrifugal disc |
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| CN101880171B true CN101880171B (en) | 2012-07-25 |
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| CN113070479A (en) * | 2021-03-18 | 2021-07-06 | 中国科学院力学研究所 | A carousel initial heating device for high temperature metal centrifugation atomizing powder process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2062093A (en) * | 1935-01-09 | 1936-11-24 | Globe Steel Abrasive Company | Means for making abrasive material |
| CN101257957A (en) * | 2005-09-05 | 2008-09-03 | 维苏维尤斯·克鲁斯布公司 | Filter device for molten metal filtration and method for producing such filters |
| CN101612666A (en) * | 2009-06-15 | 2009-12-30 | 连云港倍特超微粉有限公司 | A kind of preparation method of alloy balls and device |
-
2010
- 2010-06-23 CN CN2010102064033A patent/CN101880171B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2062093A (en) * | 1935-01-09 | 1936-11-24 | Globe Steel Abrasive Company | Means for making abrasive material |
| CN101257957A (en) * | 2005-09-05 | 2008-09-03 | 维苏维尤斯·克鲁斯布公司 | Filter device for molten metal filtration and method for producing such filters |
| CN101612666A (en) * | 2009-06-15 | 2009-12-30 | 连云港倍特超微粉有限公司 | A kind of preparation method of alloy balls and device |
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Granted publication date: 20120725 Termination date: 20130623 |