CN103231021A - Alumina-based ceramic core and preparation method thereof - Google Patents
Alumina-based ceramic core and preparation method thereof Download PDFInfo
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- CN103231021A CN103231021A CN2013100448738A CN201310044873A CN103231021A CN 103231021 A CN103231021 A CN 103231021A CN 2013100448738 A CN2013100448738 A CN 2013100448738A CN 201310044873 A CN201310044873 A CN 201310044873A CN 103231021 A CN103231021 A CN 103231021A
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Abstract
The invention relates to an alumina-based ceramic core and a preparation method thereof. The alumina-based ceramic core comprises fused corundum powder having different particle sizes, organic fibers, ammonium chloride and silica sol. The fused corundum powder having different particle has alumina content greater than or equal to 99wt% and comprises 10 to 30wt% of particles having the size of 20 to 40 meshes, 20 to 40wt% of particles having the size of 50 to 100 meshes and 30 to 70wt% of particles having the size of 200 to 325 meshes. The organic fibers have the length of 0.1 to 3mm and the diameter of 20 to 200 microns. The weight of the organic fibers is 1 to 20% of that of the fused corundum powder. The weight of the ammonium chloride is 0.08 to 0.12% of that of the fused corundum powder. The weight of the silica sol is 60 to 70% of the total weight of the fused corundum powder, the organic fibers and the ammonium chloride.
Description
The application divides an application, the application number of original application: 201110413926X, the applying date: 2011-12-13, invention and created name: sheet metal forming ceramic core and preparation method thereof.
Technical field
The present invention relates to a kind of model casting technology that has the heavy castings of hollow support plate, particularly a kind of for hollow sheet metal forming of aero-engine casing class annular cast alumina based ceramic core material and preparation method.
Background technology
Increasing the preceding intake air temperature of aero-turbine and loss of weight is the main path that improves its thrust-weight ratio.Constitute the main load parts of aero-engine, also increasingly sophisticated as the structural design of parts such as high temperature alloy rear housing, titanium alloy intermediary casing, therefore harsher requirement has been proposed for its metal matrix material and process technology thereof.From World Airways developed country development course and future trend, under the certain situation of motor power, design and adopt whole smart casting technology by casing class foundry goods thin-walled property, make the loss of weight of engine own and improve reliability, having promoted engine performance greatly, also is one of effective way that improves thrust-weight ratio.
Nearly clean shape melted module precise casting technology is to prepare the most important technology of engine crankcase class formation spare both at home and abroad.This technology is made ceramic shell then by adopting the wax material compacting wax-pattern of fusible mistake, and roasting is carried out to ceramic shell in the dewaxing back, at last melt metal is poured in the shell, treats metal freezing, the clear shell in cooling back, namely obtains required foundry goods.By controlling to mold material and to the strictness of each process procedure and technological factor in the foundry goods forming process, can obtain the near clean shape foundry goods that working face need not machining or only carries out detail sanding.Therefore melted module precise casting technology has large thin-wall element and the unitarily formed advantage that casting dimensional accuracy height, surface roughness are low, can be used for casting complex-shaped (particularly inner chamber complexity).
The aero-engine casing base part has some hollow support plates usually, in order to obtain its hollow-core construction, must increase ceramic core in the oblique support plate position in ceramic shell, after treating casting pouring, solidifying, cool off, at first remove shell, then ceramic core is removed with machinery or chemical method from support plate, namely obtained the casing foundry goods that support plate has hollow-core construction.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of sheet metal forming with ceramic core and preparation method thereof, with the demand of the melted module precise casting technology that satisfies aero-engine casing class foundry goods.
For solving the problems of the technologies described above, the invention provides a kind of sheet metal forming ceramic core, it comprises: varigrained electro-corundum powder, organic fiber, ammonium chloride and Ludox; Described varigrained electro-corundum powder, its alumina content 〉=99wt%, granularity is respectively 20-40 order, 50-100 order and 200-325 order; Wherein, granularity is that the mass percent of 20-40 purpose electro-corundum powder is 10%-30%, and granularity is that the mass percent of 50-100 purpose electro-corundum powder is 20%-40%, and granularity is that the mass percent of 200-325 purpose electro-corundum powder is 30%-70%; Described organic fiber is one of nylon fiber, polyurethane fiber, Fypro, length 0.1-3mm, and diameter 20-200 μ m, addition is the 1-20% of described electro-corundum opaque amount; Described ammonium chloride, pure for analyzing, size distribution is between the 200-325 order, and the addition of ammonium chloride is the 0.08-0.12% of electro-corundum powder; Described Ludox, pH value are 8-10, wherein content 〉=the 28wt% of silicon dioxide colloid particle; The quality of this Ludox is the 60-70% of the quality summation of described electro-corundum powder, organic fiber and ammonium chloride.
Above-mentioned the sheet metal forming preparation method of ceramic core comprises:
The first step, the preparation powder material: above-mentioned varigrained electro-corundum powder, organic fiber and ammonium chloride powder are joined in the V-type batch mixer, force to do and mix, the rotating speed of V-type batch mixer is 120 commentaries on classics/min, incorporation time is 12-24h, namely obtains the ceramic core raw material;
Second step, preparation slurry: described ceramic core raw material is joined in the Ludox, with machine,massing mixing 50-70s, namely obtain ceramic core moulding by casting slurry;
The 3rd step, moulding by casting: described slurry is poured in the support plate cavity of foundry goods moltening mold castings wax-pattern, solidifies through the 8-12min disposed slurry, obtain the solid core.This core can be removed behind casting pouring, makes the support plate of foundry goods have the hollow-core construction of certain size and shape.
Below the present invention is further illustrated:
The electro-corundum powder that adopts among the present invention is the material of main part that constitutes ceramic core, because thermal coefficient of expansion is very low, so do not have change in size substantially in roasting and casting pouring process, is conducive to the control of support plate cavity size precision.
Organic fiber of the present invention, its effect are to provide certain humidification to the wet base substrate of ceramic core, and water evaporates causes the generation of cracking phenomena when avoiding core because of roasting simultaneously; Simultaneously, organic fiber because of the oxidation burn off, makes ceramic core produce certain hole after roasting in the shell roasting process, is beneficial to the removing of core.
Ammonium chloride of the present invention is the curing agent of Ludox, and its effect is to make Ludox that gelation namely take place at normal temperatures, and the ceramic powder raw material is bonded together, and becomes the ceramic core with certain intensity.By adjusting the ratio of ammonium chloride and Ludox, can accurately control the time that ceramic core solidifies.
Ludox of the present invention, its effect are the binding agents as ceramic powder, through reacting and gelation with ammonium chloride, give the certain normal temperature strength of ceramic core and elevated temperature strength.
The present invention has the following advantages:
(1) to prepare the used ceramic material main component of alumina-based ceramic core be varigrained electro-corundum powder in the present invention, and electro-corundum is chemical grade α-Al
2O
3Make through fixed electric furnace or Dumpage type electric furnace smelting process, the density height, sintering activity is low, and thermal coefficient of expansion is very little.After forming ceramic core, size is lower because of thermal coefficient of expansion in roasting and metal bath casting process, so change in size is very little, and is not yielding, is conducive to keep the dimensional accuracy of support plate cavity;
(2) alumina based ceramic core material of the present invention, can adjust its hardening time by the addition of adjusting curing agent ammonium chloride, namely shortens along with the increase of curing agent addition the hardening time of ceramic core.The controllability of ceramic core hardening time has guaranteed that the operator can reserve the process that adequate time is finished the core cast;
(3) organic fiber of the present invention can provide significant humidification to the wet base substrate of ceramic core, and can avoid the cracking of core in roasting process; Organic fiber can also make ceramic core have certain hole because of the high-temperature oxydation burn off simultaneously, is beneficial to core and removes from the foundry goods support plate after cast.
The specific embodiment
Below embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, has provided detailed embodiment and concrete operating process.
Embodiment 1:
Taking by weighing granularity is 20-40 purpose electro-corundum powder 1kg, granularity is 50-100 purpose electro-corundum powder 20g, granularity is 200-325 purpose electro-corundum powder 7kg, nylon fiber 0.1kg, ammonium chloride 0.08kg puts in the V-type batch mixer, at rotating speed is to do under the condition of 120 commentaries on classics/min to mix 12h, obtain the ceramic core material powder, standby.
Take by weighing Ludox 400g, put in the beaker of 1000ml, take by weighing above-mentioned raw materials powder 600g then, join in the beaker, under powerful stirring condition, make material powder and Ludox mixing 1min, obtain the good slurry of mobile performance; Slurry is poured in the cavity of foundry goods wax-pattern support plate, behind about 10min, slurry curing, the solid ceramic core that namely obtains having certain intensity.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, distortion do not occur, and dimensional accuracy is qualified, after cast finished, core was more easily removed from the support plate cavity.
Embodiment 2:
Taking by weighing granularity is 20-40 purpose electro-corundum powder 2kg, granularity is 50-100 purpose electro-corundum powder 3kg, granularity is 200-325 purpose electro-corundum powder 3kg, polyurethane fiber 0.25kg, ammonium chloride 0.10kg puts into and puts into the V-type batch mixer, at rotating speed is to do under the condition of 120 commentaries on classics/min to mix 18h, obtain the ceramic core material powder, standby.
Take by weighing Ludox 400g, put in the beaker of 1000ml, take by weighing above-mentioned raw materials powder 600g then, join in the beaker, under powerful stirring condition, make material powder and Ludox mixing 1min, obtain the good slurry of mobile performance; Slurry is poured in the cavity of foundry goods wax-pattern support plate, behind about 8min, slurry curing, the solid ceramic core that namely obtains having certain intensity.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, distortion do not occur, and dimensional accuracy is qualified, after cast finished, core was easily removed from the support plate cavity.
Embodiment 3:
Taking by weighing granularity is 20-40 purpose electro-corundum powder 3kg, granularity is 50-100 purpose electro-corundum powder 3kg, granularity is 200-325 purpose electro-corundum powder 3kg, Fypro 0.5kg, ammonium chloride 0.12kg puts into and puts into the V-type batch mixer, at rotating speed is to do under the condition of 120 commentaries on classics/min to mix 24h, obtain the ceramic core material powder, standby.
Take by weighing Ludox 400g, put in the beaker of 1000ml, take by weighing above-mentioned raw materials powder 600g then, join in the beaker, under powerful stirring condition, make material powder and Ludox mixing 1min, obtain the good slurry of mobile performance; Slurry is poured in the cavity of foundry goods wax-pattern support plate, behind about 5min, slurry curing, the solid ceramic core that namely obtains having certain intensity.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, distortion do not occur, and dimensional accuracy is qualified, after cast finished, core was defeated and dispersed voluntarily, was easy to remove.
Claims (2)
1. one kind sheet metal forming ceramic core is characterized in that comprising: varigrained electro-corundum powder, organic fiber, ammonium chloride and Ludox;
Described varigrained electro-corundum powder, its alumina content 〉=99 wt%, granularity is respectively 20-40 order, 50-100 order and 200-325 order; Wherein, granularity is that the mass percent of 20-40 purpose electro-corundum powder is 10%-30%, and granularity is that the mass percent of 50-100 purpose electro-corundum powder is 20%-40%, and granularity is that the mass percent of 200-325 purpose electro-corundum powder is 30%-70%;
Described organic fiber is one of nylon fiber, polyurethane fiber, Fypro, length 0.1-3mm, and diameter 20-200 μ m, addition is the 1-20% of described electro-corundum opaque amount;
Described ammonium chloride, pure for analyzing, size distribution is between the 200-325 order, and the addition of ammonium chloride is the 0.08-0.12% of electro-corundum powder;
Described Ludox, pH value are 8, wherein the content of silicon dioxide colloid particle 〉=28 wt%; The quality of this Ludox be described electro-corundum powder, organic fiber and ammonium chloride the quality summation 70%.
2. described sheet metal forming of a claim 1 is characterized in that comprising with the preparation method of ceramic core:
The first step, the preparation powder material: varigrained electro-corundum powder, organic fiber and ammonium chloride powder are joined in the V-type batch mixer, force to do and mix, the rotating speed of V-type batch mixer is 120 commentaries on classics/min, and incorporation time is 12h, namely obtains the ceramic core raw material;
Second step, preparation slurry: described ceramic core raw material is joined in the Ludox, with machine,massing mixing 70s, namely obtain ceramic core moulding by casting slurry;
The 3rd step, moulding by casting: described slurry is poured in the support plate cavity of foundry goods moltening mold castings wax-pattern, solidifies through 8-12 min disposed slurry, obtain the solid core.
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| CN201310044873.8A CN103231021B (en) | 2011-12-13 | 2011-12-13 | Alumina-based ceramic core and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104446388A (en) * | 2014-11-10 | 2015-03-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Method of improving liquidity of aluminum oxide mould core slurry |
| CN105828976A (en) * | 2014-03-12 | 2016-08-03 | 三菱重工业株式会社 | Method for manufacturing core, and method for manufacturing turbine member in which core is acquired by said core manufacturing method |
| CN106116533A (en) * | 2016-06-23 | 2016-11-16 | 上海交通大学 | The preparation method of high-porosity alumina base ceramic core |
| CN108580806A (en) * | 2018-04-28 | 2018-09-28 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of precision stainless steel casting shell |
| CN109550904A (en) * | 2019-01-03 | 2019-04-02 | 安徽应流久源核能新材料科技有限公司 | It is a kind of using powder as Water-soluble ceramic core of raw material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105828976A (en) * | 2014-03-12 | 2016-08-03 | 三菱重工业株式会社 | Method for manufacturing core, and method for manufacturing turbine member in which core is acquired by said core manufacturing method |
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| CN108580806A (en) * | 2018-04-28 | 2018-09-28 | 佛山市高明利钢精密铸造有限公司 | A kind of preparation method of precision stainless steel casting shell |
| CN109550904A (en) * | 2019-01-03 | 2019-04-02 | 安徽应流久源核能新材料科技有限公司 | It is a kind of using powder as Water-soluble ceramic core of raw material and preparation method thereof |
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| CN103231021B (en) | 2015-06-17 |
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