CN87100034A - A kind of ceramic filter for molten steel and rapid sintering technique - Google Patents
A kind of ceramic filter for molten steel and rapid sintering technique Download PDFInfo
- Publication number
- CN87100034A CN87100034A CN 87100034 CN87100034A CN87100034A CN 87100034 A CN87100034 A CN 87100034A CN 87100034 CN87100034 CN 87100034 CN 87100034 A CN87100034 A CN 87100034A CN 87100034 A CN87100034 A CN 87100034A
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- China
- Prior art keywords
- filter
- molten steel
- casting
- ceramic
- strainer
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a kind of high efficiency ceramic foam filter and be used to filter molten steel, characteristics such as this strainer has that cost is low, simple for production, good, the anti-molten steel of result of use impacts and erosional competency is strong have good prospect for the filtration of large-scale steel-casting.Stupalith composition of the present invention has: 80～95% alumine, the fireclay of 7-17%, 0.2-1.5MgO, 0.5-2%Y
2O
3, 0.2-1%TiO
2, 0.2-1%CeO
2And an amount of concentration is 50～70% Al (H
2PO
4)
3The aqueous solution.Base substrate has been saved the energy greatly final sintering temperature insulation 2～10 minutes.
Description
The invention belongs to casting field.
The foam ceramic filter technique functions comes from late nineteen seventies, according to " Trans AFs " 1978 Vol 186 P479-486,1980 Vol, 188 P595-600 and " modern Casting " 1979 No 3 P64-65 introduce, the aluminium alloy ceramic foam filter began to be used for the filtration of aluminum alloy casting in 1978, and had obtained good effect.Although this technology has been used on aluminium alloy for many years, still be a new field for ferrous metal, document " Casting engineering ﹠amp; Foundry world " 1984 Fall P39-40, " Foundzy M﹠amp; T " Jan 1985 P72-73 point out, U.S. Conso-Licated aluminium alloy company in 1984 at first uses at high temperature fully agglomerating " selee/Fe " ceramic foam filter to filter plain carbon stool and martensitic age-hardening stainless steel has been obtained satisfied result." Trans AFS " 1985 Vol 193 P867-870, P177-182, literature research such as P171-176 the using method of ceramic foam filter, and to the influence and the pushing off the slag mechanism of cast steel characteristic.Above-mentioned document shows: filter cast steel with ceramic foam filter and have positive effect to removing the non-metallic inclusion that forms in melting and the mould filling process, can reduce casting wasted product rate and soldering rate, improve the performance (mechanical property, machinability etc.) of foundry goods each side.And filtering key is strainer, it has determined filter effect, so the manufacturing process of strainer just becomes a key link of casting filtering technique, the quality of this manufacturing process has influenced the cost of foundry goods, economic and practical strainer manufacture craft, the cost of the strainer that can reduce is the prerequisite that strainer is applied.Traditional manufacture craft is ceramic foam filter to be incubated a few hours (referring to United States Patent (USP) 3962081,3845181,4056586,3947363) under the temperature more than the sintering point, has consumed a large amount of energy like this, has increased cost; Present external cast steel ceramic foam filter is to adopt corundum, oxidation or silicon carbide sintering to form (referring to " Trans AFS " 1985 Vol 193 P867-870, " Foundry Jrade Journal " Jan 17 1985 P15-21, these refractory materialss have higher cost, by China's refractory materials price rough calculation, production cost is that we develop more than five times of ceramic foam filter.
Ceramic foam filter of the present invention is by means of loose porous, hydrophilic and the softish polyurethane foamed plastic is made, this foam materials has the hole that is interconnected in a large number, hole is surrounded by netted soft foam material, every centimetre of 5～7 holes of employed porous plastics, guarantee necessary filtering surface, the thickness that makes porous plastics is 20-25 centimetre, porosity＞90%.
Make the employed stupalith of strainer and mainly decide according to the needs that are filtered molten metal, the strainer of finally making can hang down the impact and the erosion of anti-molten steel.Filter material of the present invention is based on alumine, auxilliary a small amount of fireclay, Mgo, the Tio of adding
2, Y
2o
3, Ceo
2Deng oxide compound.Alumine mainly contains Al
2O
3And SiO
2, at high temperature sintering forms mullite and corundum mutually, has very high refractoriness and thermal shock resistance, and abundant in China's standing stock, and price is far below corundum, oxidation nail and silicon carbide.Usually, slurry is moisture 10～30%, has certain fluidity to guarantee slurry; Fireclay is a kind of ideal additive, has the rheology function on the one hand, makes slurry have required thixotropic property, saves ceramics component on the other hand, and sintering is played certain promotion; Add a small amount of MgO, Y
2O
3, at high temperature,, form MgOAl at the particulate surface in contact respectively with aluminum oxide generation solid state reaction
2O
3(spinel) and 3Y
2O
35Al
2O
3Phase is wrapped in the alumina particle surface, makes between the alumina grain diffusion of contact and particle be subjected to resistance and hinders, suppressed growing up of alumina grain, finally made goods have the microtexture that crystallite is formed, thereby improved intensity, general add-on is: MgO0.2-1.5%, Y
2O
30.5～2%; The TiO that in slurry, adds 0.2-1%
2, sinter TiO in the process into
2Form substitutional solid solution with the principal crystalline phase aluminum oxide, because Ti
+ 4The ionic electricity price compares Al
+ 3The ion height, so caused the omission of aluminum oxide lattice, near the suffered binding force of particle vacant weakens and is in active state; So just help the particle diffusion mobility, simultaneously high price Ti
+ 4Ion at high temperature also can appraise at the current rate, and becomes Ti at a low price
+ 3Ion has further increased lattice imperfection and has activated lattice, thereby has promoted sintering greatly.0.2-1%CeO
2Can reduce Al
2O
3-SiO
2Eutectic point, sintering is played a driving role; Add an amount of Al(H in addition
2PO
4)
3As middle temperature binding agent, guarantee that ceramic body had enough intensity in the past and was unlikely deformation failure at tight burning.With above-mentioned various material uniform mixing, adding concentration is 50～70 Al(H
2PO
4)
3The aqueous solution fully stirs.Prepare after the ceramic size, porous plastics immersed make it saturated in the slurry, and constantly rub, ceramic slurry is evenly distributed in the whole foam materials, squeeze out unnecessary ceramic slurry again, make and stay the very thin slurries of one deck on the porous plastics filament, to soak the body drying of spreading mass then, organic foam, sintered ceramic coating are burnt in heating, produce thus and have the complicated interconnection through hole, the ceramic body of its profile such as porous plastics.Ceramic foam filter can require to make any required shape, size according to filtration process.The employed main raw price of cast steel ceramic foam filter of the present invention is low to be held concurrently, and in China rich in natural resources is arranged, and is convenient to promote the use of.
The method of dry base substrate of the present invention has two kinds, and a kind of is 100 ℃ of down oven dry 2 hours, and another kind is seasoning 24 hours under atmosphere; After the drying base substrate is heated to 300～500 ℃ and is incubated 0.5～1 hour down, make polyurethane foam performance, burning, this section heat-up rate is advisable for 2～7 ℃/minute; Be rapidly heated (as quickly as possible) subsequently to 1500～1600 ℃ of insulations 2-10 minute, obtain the ceramic of tight burning at last.
Characteristics such as the present invention compares with external existing ceramic foam filter, and it is low to have a cost, and fabrication cycle is short.This cast steel ceramic foam filter can be used to filter carbon steel, stainless steel, is mingled with positive effect to remove nonmetal inclusion and the secondary oxidation produce in melting and mould filling process.Use ceramic foam filter to filter steel casting, the rate of reducing the number of rejects and seconds and soldering rate improve the internal quality of casting and surface quality, increase the recovery rate and the yield rate of molten steel; Improve the foundry goods toughness index, improve its homogeneity of structure; Reduce the machine tool loss.Thereby reduced energy consumption, raised labour productivity.Compare (as strainers such as honeycomb straight pass, core pattern, net types) with the strainer of other kinds, ceramic foam filter has good filtration effect, to characteristics such as alloy is pollution-free.
In China, the filtration of steel casting (or ingot casting), the filtration problem of large-scale steel-casting particularly, do not obtain satisfied solution always, ceramic foam filter of the present invention has filtered 400 kilograms high-temperature molten steel (1650 ℃ of teeming temperatures) at present, by observation and the back inspection to strainer of filtration to casting process, finds that correctly using ceramic foam filter can not fill type to molten steel causes tangible obstruction, strainer is excellent after cast, is expected to be used for bigger steel casting and filters.Cast steel ceramic foam filter of the present invention can not only be used for the type inner filtration and also can be used for type and filter outward, for the filtration of Chinese large-sized steel casting (or ingot casting) provides bright development prospect and guarantees reliably.Ceramic foam filter of the present invention in use, only must be done simple correction on the basis of original casting technique, use very convenient.
Embodiment:
Use the polyurethane foam plastic of 22 mm thick, every centimetre of 6 holes use ceramic size that following ingredients is arranged: the alumine of 80-95% (superfine), 7-17% fireclay, 0.2-1.5%MgO, 0.5-2%Y
2O
3, 0.2-1%TiO
2, 0.2-1 %CeO
2, interpolation 10～30% concentration are 50～70% Al(H
2PO
4)
3The aqueous solution.Porous plastics is immersed slurry, rub to remove air, make hole be full of slurry, the cellular fibre silk also is coated with and has hung up slurry, extrudes redundant sizing agent in the hole, makes to be coated with equably on the fiber yarn to hang up one deck ceramic size.The foamed ceramics base substrate was dried 1-3 hour down at 80-120 ℃, be warming up to 400 ℃ with 3-6 ℃/minute rate of heating, be incubated 0.5-0.6 hour,, make the porous plastics volatilization so that burn to drive away moisture content, and do not destroy the shape of base substrate, be heated to 1500-1600 ℃ with as quickly as possible speed subsequently and kept 2-10 minute, make the abundant sintering of ceramic body, then stove is chilled to about 200 ℃, take out base substrate, the ceramic foam filter that promptly has the polyurethane foam shape.
The performance and the specifications parameter of final ceramic foam filter are as follows:
Normal temperature ultimate compression strength 93.5 newton/centimetre
2
Normal temperature bending strength 50.0 newton/centimetre
2
High temperature compression strength (under 1000 ℃) 82.8 newton/centimetre
2
Refractoriness 〉=1750 ℃
3.1 centimetres of gas-forming property
3/ gram
True specific gravity 2.34 gram per centimeters
3
Structural uniformity is good
22 millimeters of thickness
Several 6 holes of hole/centimetre
Porosity 80%
Claims (2)
1, a kind of casting guiding principle strainer.It is characterized in that polyurethane foam plastic via 80-95% alumine, 7-17% fireclay, 0.2-1.5%MgO, 0.5-2%Y
2O
3, 0.2-1%CeO
2Adding 10-30% concentration after stirring is 50-70%Al (H
2PO
4)
3After the aqueous solution soaking after the drying sintering form.
2, according to claim 1: its feature 80-120 ℃ the oven dry 1-3 hour → with 3-6 ℃/minute be heated to 400 ℃ the insulation 0.5-0.6 hour → be warming up to 1500-1600 ℃ the insulation 2-10 minute → be cooled to 200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87100034 CN87100034A (en) | 1987-01-06 | 1987-01-06 | A kind of ceramic filter for molten steel and rapid sintering technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87100034 CN87100034A (en) | 1987-01-06 | 1987-01-06 | A kind of ceramic filter for molten steel and rapid sintering technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87100034A true CN87100034A (en) | 1988-04-13 |
Family
ID=4812679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87100034 Pending CN87100034A (en) | 1987-01-06 | 1987-01-06 | A kind of ceramic filter for molten steel and rapid sintering technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87100034A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1662286B (en) * | 2002-05-31 | 2010-04-28 | 南方化学高科陶瓷美国公司 | Fiber reinforced filter for molten metal filtration and method for producing such filters |
| CN101328074B (en) * | 2007-06-22 | 2010-08-11 | 宝山钢铁股份有限公司 | Ceramic particle adhesive, preparation thereof and method for preparing ceramic particle using the same |
| CN102173856A (en) * | 2010-12-20 | 2011-09-07 | 中钢集团洛阳耐火材料研究院有限公司 | Mullite ceramic foam filter for casting and preparation method thereof |
| CN102741195A (en) * | 2010-01-14 | 2012-10-17 | 工程阻拦***公司 | Celluar phosphate ceramics and methods of manufacture and use |
-
1987
- 1987-01-06 CN CN 87100034 patent/CN87100034A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1662286B (en) * | 2002-05-31 | 2010-04-28 | 南方化学高科陶瓷美国公司 | Fiber reinforced filter for molten metal filtration and method for producing such filters |
| CN101328074B (en) * | 2007-06-22 | 2010-08-11 | 宝山钢铁股份有限公司 | Ceramic particle adhesive, preparation thereof and method for preparing ceramic particle using the same |
| CN102741195A (en) * | 2010-01-14 | 2012-10-17 | 工程阻拦***公司 | Celluar phosphate ceramics and methods of manufacture and use |
| CN102741195B (en) * | 2010-01-14 | 2015-06-03 | 工程阻拦***公司 | Celluar phosphate ceramics and methods of manufacture and use |
| CN102173856A (en) * | 2010-12-20 | 2011-09-07 | 中钢集团洛阳耐火材料研究院有限公司 | Mullite ceramic foam filter for casting and preparation method thereof |
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