CN101164657A - Zirconium oxide foam ceramic filter - Google Patents
Zirconium oxide foam ceramic filter Download PDFInfo
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- CN101164657A CN101164657A CNA2007101392880A CN200710139288A CN101164657A CN 101164657 A CN101164657 A CN 101164657A CN A2007101392880 A CNA2007101392880 A CN A2007101392880A CN 200710139288 A CN200710139288 A CN 200710139288A CN 101164657 A CN101164657 A CN 101164657A
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Abstract
The present invention relates to a zirconium oxide foamed ceramic filter. It is made up by adopting the following steps: using zirconium oxide, aluminium oxide, calcium oxide and yttrium oxide to form ceramic powder, adding methyl cellulose, polyvinyl alcohol and water to prepare slurry, using soft polyurethane foamed plastics as carrier, impregnating said carrier with said slurry, extruding to obtain blank material, drying and sintering so as to obtain the invented zirconium oxide foamed ceramic filter. The invented foamed ceramic filter has good high-temperature stability and thermal shocking resistance in the high-temperature molten steel, does not contaminate alloy and can obtain good filtering purification effect.
Description
Technical field
The present invention relates to the purification of motlten metal, be specifically related to ceramic foam filter.More particularly, the present invention relates to contain the ceramic foam filter of zirconia as ceramic composition, the filter of the present invention's preparation is used for the filtration, purification of metal baths such as cast steel and high temperature alloy to be handled.
Background technology
In the melting and casting process of various metal liquid alloys, because the casting wasted product rate that casting flaws such as the non-metallic inclusion and the pore that contracts cause is generally up to 50～60% of waste product sum.Inclusion defect not only seriously reduces the mechanical performance and the casting character of foundry goods, and also machining and the outward appearance to foundry goods produces adverse effect.Purify liquid casting alloy, reduce or eliminate wherein each kind of non-metallic inclusion and exhaust, obtain the important technique measure of high quality casting beyond doubt.
Filtering technique is applied to the Foundry Production history of existing decades, but only is at first with coming the filtering bulk inclusion in the simple filtering device insertion running gate systems such as wire netting, steel plate with holes, porous loam core.From the sixties, occurred two-dimensional structure type inner filtration nets such as alumina silicate fibre matter, molybdenum filament matter, boron nitride fiber matter in Russia, American and Britain, medium country successively, and be applied aborning, obtained certain effect.But all these screen packs can only be by bulk inclusion in the mechanical grading effect filtering molten metal and the little field trash of only a few.Because the refractoriness and the intensity of alumina silicate fibre screen pack are all lower, can only be used for the filtration of non-ferrous alloy, cast iron and small casting steel, are difficult to bear for a long time the impact of high-temperature metal fluid; Though the boron nitride fiber matter screen pack of the molybdenum filament matter of Britain's development and U.S.'s development can be used to filter high temperature alloys such as cast steel, because of it costs an arm and a leg, its application is restricted.Be used for straight hole core pattern ceramic filter and refractory particle filter in addition that casting alloy filters, but their porosity is all less, and the former filter efficiency is still lower, the filter effect instability, the latter makes its leakiness grain owing to do not have cementation between particle, uses also inconvenient.Though the slug type porous ceramic filter that the early seventies U.S. succeeds in developing has at first solved refractory particle filter leakiness grain and inconvenient problem with use, but the honeycomb straight-bore ceramic filter of succeeding in developing at first with the early eighties U.S. is the same, porosity is still less, be generally less than 50%, make that the mistake flow rate of molten metal is lower.
Ceramic foam filter is the third generation filtering product after refractory fibre screen pack, honeycomb straight-bore ceramic filter, ceramic foam filter the earliest is the aluminium alloy ceramic foam filter that U.S. Consolidated Aluminum company in 1978 succeeds in developing, and its commodity are called Selee/Al.Developed the ceramic foam filter Selee/Fe that is used to filter ferrous metal in 1984 again.Domestic casting alloy starts from early eighties with the development of ceramic foam filter, and the ceramic foam filter that Harbin University of Science and Technology succeeded in developing the earliest in nineteen eighty-two can only be used for the filtration of aluminium alloy.
Ceramic foam filter is that the employing polyurethane foam plastics is a carrier, it is immersed in the slurry of being made by ceramic powders, adhesive, sintering aid, suspending agent etc., squeeze out unnecessary slurry then, making ceramic size evenly be coated on carrier framework becomes base substrate, forms the base substrate oven dry and through high-temperature roasting again.Ceramic foam filter has the pore structure similar to foamed plastics, and through-hole rate reaches 85～90%.
Because the particular filter purification mechanism that unique 3 D stereo network structure is had (machinery interception; Exhaust rectification scum silica frost; Trickle slag inclusion deep layer absorption), the clean-up effect of ceramic foam filter is that refractory fibre screen pack and honeycomb straight-bore ceramic filter are incomparable, its feature is that rigid-skeleton is even, quality of molten metal decentralization after the filtration is little, filtering accuracy is good etc., most of little small solid suspension clamp foreign material to several microns in not only can the elimination molten metal, slag and gas that can also the elimination liquid state.Use ceramic foam filter filtering molten metal liquid, can also make the flow velocity of molten metal become mitigation in order, improve the microscopic structure and the mechanical property of foundry goods greatly, improve the quality and the compactness of foundry goods, the wearing and tearing of cutter when reducing the foundry goods machining.Facts have proved that the filter efficiency of ceramic foam filter is up to 75～97%, therefore, ceramic foam filter has been widely used in melting during body purifies of aluminium, copper, iron and steel, is subjected to increasing metallurgy, foundry enterprise favor.
Closely during the last ten years, the domestic and international characteristics of root a tree name different-alloy, developed the ceramic foam filter of multiple unlike material, as United States Patent (USP) 3893917,3962081,4024056,4075303, Chinese patent 85102359A, 87101800.4,92102883.0 or the like.These ceramic foam filters are made with materials such as aluminium oxide, silica, zirconia, carborundum, can be used to filter general aluminium alloy, copper alloy, cast iron, cast steel etc.
As everyone knows, in Foundry Production, in order to obtain pure molten steel, and then improve the quality and the qualification rate of foundry goods, often adopt ceramic foam filter to filter molten steel.With material such as aluminium oxide, carborundum, quartz and suitably the filter made of binding agent generally be used for the filtration, purification of molten iron and molten non-ferrous metal, but the elevated temperature strength of these ceramic foam filters is low, emergency heat and cooling property resistance, chilling impact and hot melt scouring capability are not enough, foam structure easily takes off slag, softening, Thermochemical Decomposition in the use, can not filter high temperature gold bits melt, more can not satisfy the filtration requirement of molten steel.
Zirconic fusing point is up to 2715 ℃, and it is very low to generate free enthalpy, and the chemical stability height is very good refractory material.But because zirconia has 3 kinds of crystal formations, it during low temperature monoclinic system, it during high temperature tetragonal crystal system, change cubic system under the higher temperature, cube mutually the phase transformation to cubic phase belongs to diffusion transformation, the four directions belongs to martensite transfor mation to the phase transformation of monocline phase mutually, and what the material at high temperature performance was had material impact is cubic martensite transfor mation of arriving the monocline phase mutually.If zirconic crystal transfer control is improper, just can not obtain complete Zirconium oxide foamed ceramic filter goods.Because the manufacture method of ceramic foam filter is to be coated with to hang on three-dimensional netted foamed plastics with ceramic size to be shaped, the powder bulk density is low, compare with the zirconia ceramics of press molding, sintering mass transport process and solid solution reaction have characteristics in addition, sintering shrinks bigger, so the preparation Zirconium oxide foam ceramic filter has bigger difficulty.
Harbin University of Science and Technology is with Al
2O
3For base-material adds an amount of ZrO
2Flexibilizer and a small amount of TiO
2, the fire clay sintering agent, and be binding agent with the aluminium dihydrogen phosphate, at 1560 ℃ of following sintering, prepare the cast steel ceramic foam filter.Northwestern Polytechnical University and 331 factories in the beginning of the nineties in last century joint research and development developed the Al that can be used for cast steel and high temperature alloy
2O
3-SiO
2Foam ceramic filter, but can only be used for the Foundry Production of following steel-casting of 10kg and high temperature alloy foundry goods.
Yingkou Magnesial Material Inst. selects for use electro-corundum as matrix material, other adds a small amount of mullite as additive, succeeded in developing a kind of corundum-mullite foam ceramic filter, serviceability temperature reaches 1600 ℃, be used for pouring temperature and be K3, K17 high temperature alloy about 1500 ℃～1580 ℃, can make the scrappage that is mingled with of precision castings descend 30～50%, and can improve the performance of alloy-steel casting.
Harbin Institute of Technology is a matrix material with the fire clay, succeeds in developing a kind of Zirconium oxide plasticizing ceramic foam filter, and the interpolation material mixture ratio is ZrO
28%, TiO
20.5%, Al
2O
340%.It is said that this kind of ceramic foam filter can soak 10min not to be destroyed, and is dipped to holding time of destruction and can reaches 8min in the cast steel liquation in liquid spheroidal graphite cast-iron.
University of Science ﹠ Technology, Beijing has succeeded in developing magnesia partly stabilized zircite floamed ceramic filter, and Liaoning engineering college is a raw material with alumina powder and zircon powder, has made fused alumina zirconia/mullite ceramic foam filter by reaction-sintered.
Though above-mentioned Study of Ceramic Foam Filters has obtained certain achievement, all exist the deficiency of resistance to elevated temperatures and poor impact resistance, when filtering a large amount of molten steel, go back defectiveness.
Summary of the invention
The purpose of this invention is to provide a kind of high temperature resistant, thermal shock resistance is good, is fit to the Zirconium oxide foam ceramic filter that metal melt filterings such as a large amount of cast steels and high temperature alloy purify.
A kind of preparation method of above-mentioned Zirconium oxide foam ceramic filter being provided, making the filter that makes have good toughness and compression strength, reduce the production cost of filter simultaneously, is another goal of the invention of the present invention.
Zirconium oxide foam ceramic filter of the present invention is the raw material with following percetage by weight:
Zirconia 75～80%
Aluminium oxide 10～15%
Calcium oxide 5～10%
Yittrium oxide 0.5～2%
Form ceramic powders, based on this, add following auxiliary material again:
Carboxymethyl cellulose 0.2～0.8%
Polyvinyl alcohol 0.5～1.5%
Water 30～50%
The preparation slip,
With the flexible polyurethane foams is carrier, floods above-mentioned slip, is crushed to blank, and dry back sintering obtains Zirconium oxide foam ceramic filter.
Reversible crystal formation conversion takes place with the variation of temperature and pressure in zirconic three kinds of crystal formations, and in conversion process, is accompanied by huge expansion and contraction, and Volume Changes is very big, ftractures easily when causing ceramic to burn till.So the present invention adopts electric-melting zirconia to make raw material, add an amount of calcium oxide, yittrium oxide as volume stabilizer to stablize crystal formation.More than 1500 ℃ the time, the zirconia of square crystal formation can generate the solid solution of cube type with the oxide that adds, and still can keep this cube of type solid solution structure after the cooling, does not have reversible conversion, so also there is not bulk effect, ftractures in the time of can avoiding goods to burn till.
The present invention adopts aqueous binders carboxymethyl cellulose and the polyvinyl alcohol binding agent as Zirconium oxide foam ceramic filter through contrast test repeatedly.
Adopt the advantage of this binding agent to show the following aspects: the first, the whole voloxidation of binding agent in the sintering process, no pernicious gas is discharged, and helps environmental protection; Noresidue binding agent raw material helps guaranteeing product quality in the ceramic filter product, can not influence casting quality in the use.The second, adhesive preparation and product are stained with no pernicious gas volatilization in slurry, the drying course, help employee's operation.Three, ceramic filter blank (semi-finished product) rate of drying is fast, nonhygroscopic, and slurry is attached to and is easy in all kinds of vessel clean, and is convenient to recycle, and helps industrial scale production and prevents the waste of raw material.
The concrete preparation method of Zirconium oxide foam ceramic filter of the present invention may further comprise the steps:
A) mix various raw materials according to following percetage by weight and obtain ceramic powders:
Zirconia 75～80%
Aluminium oxide 10～15%
Calcium oxide 5～10%
Yittrium oxide 0.5～2%
Based on above-mentioned ceramic powders, add following auxiliary material again:
Carboxymethyl cellulose 0.2～0.8%
Polyvinyl alcohol 0.5～1.5%
Water 30～50%
Mix, make slurry;
B) be carrier with the flexible polyurethane foams, flood above-mentioned slurry, and be crushed to blank;
C) blank is put into drying box, 100～110 ℃ of dry sclerosis;
D) the blank sintering furnace of packing in dry back is warming up to 1700～1800 ℃ of high temperature sinterings, obtains Zirconium oxide foam ceramic filter.
According to the requirement to Zirconium oxide foam ceramic filter, the granularity that is used as the raw material of ceramic powders should be greater than 320 orders.
According to the inventive method, need provide the carrier of a kind of cancellated organic polymer foamed material as ceramic slurry.This carrier is preferably made by hydrophobic flexible foams, has many interconnected interstices of being surrounded by the nethike embrane of described flexible foams, and this foamed material must promptly burn before the firing temperature that is lower than used ceramic material or vaporize.Any flammable organic plastic foam material that has elasticity and can recover original form all can use, and the present invention adopts flexible polyurethane foams as carrier, and the flexible polyurethane foams of selecting for use has the aperture of 10PPI.
Among the present invention, be that described flexible polyurethane foams is soaked 20～30min earlier in pH value is 50～60 ℃ of aqueous slkalis of 7.5～8.5, remove aqueous slkali with the clear water rinsing again, after the air dry as the carrier use of ceramic slurry.
The present invention is that the specific embodiment of ceramic foam filter is with the blank high temperature sintering: blank is packed in the sintering furnace, programming rate with 90 ℃/h is warming up to 500 ℃ of low-temp plastic-removings at a slow speed by room temperature, after treating foamed plastics burning volatilization, successively the programming rate with 150 ℃/h is rapidly heated to 1000 ℃, programming rate with 250 ℃/h is warming up to 1250 ℃, programming rate with 120 ℃/h is warming up to 1600 ℃, be warming up to 1700～1800 ℃ sintering temperature at last with the programming rate of 90 ℃/h, and under this temperature, be incubated 2～4h.
The Zirconium oxide foam ceramic filter of the present invention's preparation is the space network structure, and wherein the cavity interconnects, and voidage can reach 80～90%.
Ceramic foam filter of the present invention has good high-temperature stability and resistance to sudden heating in high temperature cast steel liquation, can avoid in use the fragmentation that causes because of mechanical shock and thermal shock, do not pollute alloy, oxide inclusion in the molten metal and flux are mingled with good filtration and adsorption capacity, filtration, purification is effective, and thermal capacitance is little, can preheating during use, the convection cell resistance is little, and filtration yield is big.
The Zirconium oxide foam ceramic filter of the present invention's preparation is through the filtration, purification test of steel and high temperature alloy liquation, and is every functional.
The specific embodiment
Embodiment 1
According to 78.5: 13: 6.5: 1 weight ratio, with the fully mixed ceramic powders of making of zirconia, aluminium oxide, calcium oxide and yittrium oxide.
With ceramic powders, carboxymethyl cellulose, polyethylene alcohol and water according to 60: 0.5: 1: 40 weight ratio is mixed, and adds in the mixer to stir 2～3h, makes to stir, and makes ceramic slurry.
Select the flexible polyurethane foams of 10PPI for use, be processed into 50mm * 50mm * 22mm size, be placed on the pH value and be in 60 ℃ of aqueous slkalis of 7.5 and soak 20min, film with the plastic eyelet intraocular that defoams, remove aqueous slkali with the clear water rinsing then, moisture is removed in air dry afterwards, as the carrier of ceramic slurry.
Adopt roll-in to be stained with sizing process, on the foamed plastics carrier, add ceramic slurry, again the carrier input is stained with to push in the pulp grinder and is stained with slurry, extrude superfluous slip, make the ceramic foam filter blank.
The ceramic foam filter blank is put into drying box, and temperature is controlled in 100～105 ℃ of scopes, and dry 0.5～1h makes it sclerosis.
Dry blank is packed in the sintering furnace, programming rate with 90 ℃/h is warming up to 500 ℃ of low-temp plastic-removings at a slow speed by room temperature, after treating foamed plastics burning volatilization, priority is rapidly heated to 1000 ℃ with the programming rate of 150 ℃/h again, programming rate with 250 ℃/h is warming up to 1250 ℃, programming rate with 120 ℃/h is warming up to 1600 ℃, programming rate with 90 ℃/h is warming up to 1720 ℃ at last, and under this temperature, be incubated 2h, naturally cool to room temperature and come out of the stove, can obtain Zirconium oxide foam ceramic filter.
Embodiment 2:
According to 80: 12: 7: 1 weight ratio, with the fully mixed ceramic powders of making of zirconia, aluminium oxide, calcium oxide and yittrium oxide.
With ceramic powders, carboxymethyl cellulose, polyethylene alcohol and water according to 63: 0.8: 1: 37 weight ratio is mixed, and adds in the mixer to stir 2～3h, makes to stir, and makes ceramic slurry.
Select the flexible polyurethane foams of 10PPI for use, be processed into 50mm * 50mm * 22mm size, be placed on the pH value and be in 60 ℃ of aqueous slkalis of 7.5 and soak 20min, film with the plastic eyelet intraocular that defoams, remove aqueous slkali with the clear water rinsing then, moisture is removed in air dry afterwards, as the carrier of ceramic slurry.
Adopt roll-in to be stained with sizing process, on the foamed plastics carrier, add ceramic slurry, again the carrier input is stained with to push in the pulp grinder and is stained with slurry, extrude superfluous slip, make the ceramic foam filter blank.
The ceramic foam filter blank is put into drying box, and temperature is controlled in 100～105 ℃ of scopes, and dry 0.5～1h makes it sclerosis.
Dry blank is packed in the sintering furnace, programming rate with 90 ℃/h is warming up to 500 ℃ of low-temp plastic-removings at a slow speed by room temperature, after treating foamed plastics burning volatilization, priority is rapidly heated to 1000 ℃ with the programming rate of 150 ℃/h again, programming rate with 250 ℃/h is warming up to 1250 ℃, programming rate with 120 ℃/h is warming up to 1600 ℃, programming rate with 90 ℃/h is warming up to 1740 ℃ at last, and under this temperature, be incubated 3h, naturally cool to room temperature and come out of the stove, can obtain Zirconium oxide foam ceramic filter.
Embodiment 3:
According to 75: 15: 8: 2 weight ratio, with the fully mixed ceramic powders of making of zirconia, aluminium oxide, calcium oxide and yittrium oxide.
With ceramic powders, carboxymethyl cellulose, polyethylene alcohol and water according to 65: 0.8: 0.8: 35 weight ratio is mixed, and adds in the mixer to stir 2～3h, makes to stir, and makes ceramic slurry.
Select the flexible polyurethane foams of 10PPI for use, processing 50mm * 50mm * 22mm size, be placed on the pH value and be in 60 ℃ of aqueous slkalis of 7.5 and soak 20min, film with the plastic eyelet intraocular that defoams, remove aqueous slkali with the clear water rinsing then, moisture is removed in air dry afterwards, as the carrier of ceramic slurry.
Adopt roll-in to be stained with sizing process, on the foamed plastics carrier, add ceramic slurry, again the carrier input is stained with to push in the pulp grinder and is stained with slurry, extrude superfluous slip, make the ceramic foam filter blank.
The ceramic foam filter blank is put into drying box, and temperature is controlled in 100～105 ℃ of scopes, and dry 0.5～1h makes it sclerosis.
Dry blank is packed in the sintering furnace, programming rate with 90 ℃/h is warming up to 500 ℃ of low-temp plastic-removings at a slow speed by room temperature, after treating foamed plastics burning volatilization, priority is rapidly heated to 1000 ℃ with the programming rate of 150 ℃/h again, programming rate with 250 ℃/h is warming up to 1250 ℃, programming rate with 120 ℃/h is warming up to 1600 ℃, programming rate with 90 ℃/h is warming up to 1760 ℃ at last, and under this temperature, be incubated 4h, naturally cool to room temperature and come out of the stove, can obtain Zirconium oxide foam ceramic filter.
Claims (5)
1. Zirconium oxide foam ceramic filter is the raw material with following percetage by weight:
Zirconia 75～80%
Aluminium oxide 10～15%
Calcium oxide 5～10%
Yittrium oxide 0.5～2%
Form ceramic powders, based on this, add following auxiliary material again:
Carboxymethyl cellulose 0.2～0.8%
Polyvinyl alcohol 0.5～1.5%
Water 30～50%
The preparation slurry,
With the flexible polyurethane foams is carrier, floods above-mentioned slurry, is crushed to blank, and dry back sintering obtains Zirconium oxide foam ceramic filter.
2. the preparation method of the described Zirconium oxide foam ceramic filter of claim 1 may further comprise the steps:
A) mix various raw materials according to following percetage by weight and obtain ceramic powders:
Zirconia 75～80%
Aluminium oxide 10～15%
Calcium oxide 5～10%
Yittrium oxide 0.5～2%
Based on above-mentioned ceramic powders, add following auxiliary material again:
Carboxymethyl cellulose 0.2～0.8%
Polyvinyl alcohol 0.5～1.5%
Water 30～50%
Mix, make slurry;
B) be carrier with the flexible polyurethane foams, flood above-mentioned slurry, and be crushed to blank;
C) blank is put into drying box, 100～110 ℃ of dry sclerosis;
D) the blank sintering furnace of packing in dry back is warming up to 1700～1800 ℃ of high temperature sinterings, obtains Zirconium oxide foam ceramic filter.
3. the preparation method of Zirconium oxide foam ceramic filter according to claim 2, it is characterized in that described flexible polyurethane foams is to soak 20～30min in pH is 50～60 ℃ of aqueous slkalis of 7.5～8.5, the flexible polyurethane foams of air dry behind the aqueous slkali is removed in the clear water rinsing.
4. the preparation method of Zirconium oxide foam ceramic filter according to claim 2 is characterized in that described flexible polyurethane foams carrier has the aperture of 10PPI.
5. the preparation method of Zirconium oxide foam ceramic filter according to claim 2, it is characterized in that described high temperature sintering is that programming rate with 90 ℃/h rises to 500 ℃ by room temperature, programming rate with 150 ℃/h is warming up to 1000 ℃ again, programming rate with 250 ℃/h is warming up to 1250 ℃, programming rate with 120 ℃/h is warming up to 1600 ℃, programming rate with 90 ℃/h is warming up to 1700～1800 ℃ at last, and is incubated 2～4h under this temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101392880A CN100536987C (en) | 2007-08-24 | 2007-08-24 | Zirconium oxide foam ceramic filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101392880A CN100536987C (en) | 2007-08-24 | 2007-08-24 | Zirconium oxide foam ceramic filter |
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| Publication Number | Publication Date |
|---|---|
| CN101164657A true CN101164657A (en) | 2008-04-23 |
| CN100536987C CN100536987C (en) | 2009-09-09 |
Family
ID=39333593
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|---|---|---|---|
| CNB2007101392880A Expired - Fee Related CN100536987C (en) | 2007-08-24 | 2007-08-24 | Zirconium oxide foam ceramic filter |
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| CN101559490B (en) * | 2009-04-17 | 2011-01-05 | 中国航空工业第一集团公司北京航空材料研究院 | Method for preparing double-scanning and spray forming high-speed steel under purification |
| CN102000458A (en) * | 2010-10-19 | 2011-04-06 | 北京航空航天大学 | Yttria foamed ceramic filter and preparation method thereof |
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| CN102000458B (en) * | 2010-10-19 | 2012-03-21 | 北京航空航天大学 | Yttria foamed ceramic filter and preparation method thereof |
| CN104926331A (en) * | 2015-06-19 | 2015-09-23 | 武汉科技大学 | Renewable ceramic filter for continuous casting tundish and preparation method thereof |
| CN104944984A (en) * | 2015-06-19 | 2015-09-30 | 武汉科技大学 | Ceramic filter for continuous casting tundish and method for preparing the same |
| CN104926331B (en) * | 2015-06-19 | 2017-03-01 | 武汉科技大学 | A kind of continuous casting production renewable ceramic filter and preparation method thereof |
| CN106220218A (en) * | 2016-07-25 | 2016-12-14 | 济南圣泉倍进陶瓷过滤器有限公司 | A kind of ceramic foam filter and manufacture method thereof |
| CN107056255A (en) * | 2017-01-18 | 2017-08-18 | 武汉科技大学 | A kind of calcium oxide filter and preparation method thereof |
| CN107019961A (en) * | 2017-05-17 | 2017-08-08 | 东风精密铸造安徽有限公司 | One kind is cast with inexpensive compound molten steel screen pack factory formula |
| CN107344852A (en) * | 2017-06-28 | 2017-11-14 | 武汉科技大学 | A kind of ZrO2CaO composite foamed ceramics and preparation method thereof |
| CN107344852B (en) * | 2017-06-28 | 2020-04-24 | 武汉科技大学 | ZrO (ZrO)2-CaO composite foamed ceramic and preparation method thereof |
| CN109317611A (en) * | 2018-11-15 | 2019-02-12 | 安徽应流集团霍山铸造有限公司 | A kind of sand mould casting method of nickel base superalloy casting |
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