CN103231021B - Alumina-based ceramic core and preparation method thereof - Google Patents
Alumina-based ceramic core and preparation method thereof Download PDFInfo
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- CN103231021B CN103231021B CN201310044873.8A CN201310044873A CN103231021B CN 103231021 B CN103231021 B CN 103231021B CN 201310044873 A CN201310044873 A CN 201310044873A CN 103231021 B CN103231021 B CN 103231021B
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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 is divisional application, the application number of original application: 201110413926X, the applying date: 2011-12-13, invention and created name: ceramic core for molding of support plate and preparation method thereof.
Technical field
The present invention relates to a kind of Investment casting technology of the heavy castings with hollow support plate, particularly a kind of for the shaping alumina based ceramic core material of aero-engine casing class annular cast hollow support plate and preparation method.
Background technology
Before increasing aero-turbine, intake air temperature and loss of weight are the main paties improving its thrust-weight ratio.Form the main load parts of aero-engine, the structural design as parts such as high temperature alloy rear housing, titanium alloy Middle casing is also increasingly sophisticated, therefore proposes harsher requirement to its metal matrix material and process technology thereof.From course and the future trend of the development of World Airways developed country, when motor power is certain, designed by casing class foundry goods thin-walled property and adopt overall smart casting technology, make the loss of weight of engine own and improve reliability, greatly improving engine performance, is also one of effective way improving thrust-weight ratio.
Near net-shaped melted module precise casting technology prepares the most important technology of engine crankcase class formation part both at home and abroad.This technology is by adopting the wax material compacting wax-pattern of fusible mistake, and then make ceramic shell, carry out roasting after dewaxing to ceramic shell, be finally poured in shell by the metal of melting, after metal freezing, cooling, clear shell, namely obtains required foundry goods.By to mold material and the strict control to process procedure each in foundry goods forming process and technological factor, working face can be obtained without the need to machining or the near net-shaped foundry goods only carrying out detail sanding.Therefore melted module precise casting technology has the large thin-wall element and unitarily formed advantage that casting dimensional accuracy is high, surface roughness is low, can be used for casting complex-shaped (particularly inner chamber is complicated).
Aero-engine casing base part has some hollow support plates usually, in order to obtain its hollow-core construction, ceramic core must be increased in oblique support plate position in ceramic shell, until casting pouring, solidify, cool after, first shell is removed, then ceramic core is removed by machinery or chemical method from support plate, namely obtain 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 is to provide a kind of ceramic core for molding of support plate and preparation method thereof, to meet the demand of the melted module precise casting technology of aero-engine casing class foundry goods.
For solving the problems of the technologies described above, the invention provides a kind of ceramic core for molding of support plate, 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 the mass percent of 20-40 object electro-corundum powder is 10%-30%, and granularity is the mass percent of 50-100 object electro-corundum powder is 20%-40%, and granularity is the mass percent of 200-325 object electro-corundum powder is 30%-70%; Described organic fiber is one of nylon fiber, polyurethane fiber, Fypro, length 0.1-3mm, diameter 20-200 μm, and addition is the 1-20% of described electro-corundum opaque amount; Described ammonium chloride, pure for analyzing, size distribution is between 200-325 order, and the addition of ammonium chloride is the 0.08-0.12% of electro-corundum powder; Described Ludox, pH value is 8-10, wherein content >=the 28wt% of silica colloidal particles; The quality of this Ludox is the 60-70% of the quality summation of described electro-corundum powder, organic fiber and ammonium chloride.
The preparation method of above-mentioned ceramic core for molding of support plate, comprising:
The first step, preparation powder material: join in V-type batch mixer by above-mentioned varigrained electro-corundum powder, organic fiber and ammonium chloride powder, carry out pressure and be dry mixed, the rotating speed of V-type batch mixer is 120 turns/min, incorporation time is 12-24h, namely obtains ceramic core raw material;
Second step, preparation slurry: described ceramic core raw material is joined in Ludox, with machine,massing mixing 50-70s, namely obtains ceramic core moulding by casting slurry;
3rd step, moulding by casting: be poured into by described slurry in the support plate cavity of foundry goods moltening mold castings wax-pattern, through the solidification of 8-12min disposed slurry, obtains solid core.This core can be removed after casting pouring, makes the support plate of foundry goods have the hollow-core construction of certain size and shape.
The present invention is further illustrated below:
The electro-corundum powder adopted in the present invention, is the material of main part forming ceramic core, because thermal coefficient of expansion is very low, so substantially do not have change in size 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 to be wet the humidification that base substrate provides certain to ceramic core, avoids core to cause the generation of cracking phenomena because of moisture evaporation during roasting simultaneously; Meanwhile, organic fiber is in Baking process, and the burn off because of oxidation, makes ceramic core produce certain hole after baking, be beneficial to the removing of core.
Ammonium chloride of the present invention is the curing agent of Ludox, and its effect makes Ludox namely gelation occur at normal temperatures, ceramic powder raw material is bonded together, becomes the ceramic core with some strength.By adjusting the ratio of ammonium chloride and Ludox, the time of ceramic core solidification accurately can be controlled.
Ludox of the present invention, its effect is the binding agent as ceramic powder, through reacting and gelation with ammonium chloride, gives the certain normal temperature strength of ceramic core and elevated temperature strength.
The present invention has the following advantages:
(1) the present invention prepares alumina-based ceramic core ceramic material main component used is varigrained electro-corundum powder, and electro-corundum is chemical grade α-Al
2o
3obtain through fixed electric furnace or Dumpage type electric furnace smelting process, density is high, and sintering activity is low, and thermal coefficient of expansion is very little.After formation ceramic core, in roasting and metal bath casting process size because of thermal coefficient of expansion lower, therefore change in size is very little, not yielding, is conducive to the dimensional accuracy keeping support plate cavity;
(2) alumina based ceramic core material of the present invention, its hardening time can be adjusted by the addition of adjustment 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 ensure that operator can reserve the process that the sufficient time completes core cast;
(3) organic fiber of the present invention, can provide significant humidification to the ceramic core base substrate that wets, and can avoid the cracking of core in roasting process; Organic fiber is because of high-temperature oxydation burn off simultaneously, and ceramic core can also be made to have certain hole, is beneficial to core and removes from foundry goods support plate after cast.
Detailed description of the invention
Below embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process.
Embodiment 1:
Taking granularity is 20-40 object electro-corundum powder 1kg, granularity is 50-100 object electro-corundum powder 20g, granularity is 200-325 object electro-corundum powder 7kg, nylon fiber 0.1kg, ammonium chloride 0.08kg, puts in V-type batch mixer, is to be dry mixed 12h under the condition of 120 turns/min at rotating speed, obtain ceramic core material powder, for subsequent use.
Take Ludox 400g, put in the beaker of 1000ml, then take above-mentioned raw materials powder 600g, join in beaker, under the condition of strong stirring, make material powder and Ludox mixing 1min, obtain the slurry that mobile performance is excellent; Be poured into by slurry in the cavity of casting wax mould support plate, after about 10min, slurry curing, namely obtains the solid ceramic core with some strength.
By the pouring experiment of the actual part of casing, show the uniform wall thickness of casing support plate, do not occur distortion, and dimensional accuracy is qualified, after cast terminates, core is easier to be removed from support plate cavity.
Embodiment 2:
Taking granularity is 20-40 object electro-corundum powder 2kg, granularity is 50-100 object electro-corundum powder 3kg, granularity is 200-325 object electro-corundum powder 3kg, polyurethane fiber 0.25kg, ammonium chloride 0.10kg, puts into and puts into V-type batch mixer, is to be dry mixed 18h under the condition of 120 turns/min at rotating speed, obtain ceramic core material powder, for subsequent use.
Take Ludox 400g, put in the beaker of 1000ml, then take above-mentioned raw materials powder 600g, join in beaker, under the condition of strong stirring, make material powder and Ludox mixing 1min, obtain the slurry that mobile performance is excellent; Be poured into by slurry in the cavity of casting wax mould support plate, after about 8min, slurry curing, namely obtains the solid ceramic core with some strength.
By the pouring experiment of the actual part of casing, show the uniform wall thickness of casing support plate, do not occur distortion, and dimensional accuracy is qualified, after cast terminates, core is easily removed from support plate cavity.
Embodiment 3:
Taking granularity is 20-40 object electro-corundum powder 3kg, granularity is 50-100 object electro-corundum powder 3kg, granularity is 200-325 object electro-corundum powder 3kg, Fypro 0.5kg, ammonium chloride 0.12kg, puts into and puts into V-type batch mixer, is to be dry mixed 24h under the condition of 120 turns/min at rotating speed, obtain ceramic core material powder, for subsequent use.
Take Ludox 400g, put in the beaker of 1000ml, then take above-mentioned raw materials powder 600g, join in beaker, under the condition of strong stirring, make material powder and Ludox mixing 1min, obtain the slurry that mobile performance is excellent; Be poured into by slurry in the cavity of casting wax mould support plate, after about 5min, slurry curing, namely obtains the solid ceramic core with some strength.
By the pouring experiment of the actual part of casing, show the uniform wall thickness of casing support plate, do not occur distortion, and dimensional accuracy is qualified, after cast terminates, core is defeated and dispersed voluntarily, is easy to remove.
Claims (1)
1. a ceramic core for molding of support plate, 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 the mass percent of 20-40 object electro-corundum powder is 10%-30%, and granularity is the mass percent of 50-100 object electro-corundum powder is 20%-40%, and granularity is the mass percent of 200-325 object electro-corundum powder is 30%-70%;
Described organic fiber is nylon fiber, length 0.1-3mm, diameter 20-200 μm, and addition is the 1-20% of described electro-corundum opaque amount;
Described ammonium chloride, pure for analyzing, size distribution is between 200-325 order, and the addition of ammonium chloride is the 0.08-0.12% of electro-corundum powder;
Described Ludox, pH value is 8, wherein content >=28 wt% of silica colloidal particles; The quality of this Ludox is 70% of the quality summation of described electro-corundum powder, organic fiber and ammonium chloride;
Electro-corundum is chemical grade α-Al
2o
3obtain through fixed electric furnace smelting process.
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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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| CN103231021B true CN103231021B (en) | 2015-06-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6191076B2 (en) * | 2014-03-12 | 2017-09-06 | 三菱重工業株式会社 | MANUFACTURING METHOD FOR CORE, AND TURBINE MEMBER MANUFACTURING METHOD FOR OBTAINING CORE WITH MANUFACTURING METHOD |
| CN104446388B (en) * | 2014-11-10 | 2016-06-22 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of method improving aluminium oxide core slurry fluidity |
| 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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| US4989664A (en) * | 1988-07-07 | 1991-02-05 | United Technologies Corporation | Core molding composition |
| JPH0639483A (en) * | 1992-07-27 | 1994-02-15 | Kawasaki Refract Co Ltd | Ceramic core |
| CN101386546A (en) * | 2008-10-14 | 2009-03-18 | 华南理工大学 | Self-reacting alumina-base composite ceramic mold core for fine casting and preparation method thereof |
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Address after: 212000, Jiangsu, Zhenjiang Province, Danyang City, Lu Town, 1 Military and civilian canal West Applicant after: Jiangsu Tu Nan alloy limited company Address before: 212000, No. 1, army West Road, Yunhe Town, Zhenjiang City, Jiangsu Province, Danyang Applicant before: Danyang Precision Alloy Factory Co., Ltd. |
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