CN103073319B - Alumina-based ceramic core for support plate forming - Google Patents
Alumina-based ceramic core for support plate forming Download PDFInfo
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- CN103073319B CN103073319B CN201310044916.2A CN201310044916A CN103073319B CN 103073319 B CN103073319 B CN 103073319B CN 201310044916 A CN201310044916 A CN 201310044916A CN 103073319 B CN103073319 B CN 103073319B
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Abstract
The invention relates to an alumina-based ceramic core for support plate forming. The alumina-based ceramic core comprises fused corundum powder with different granularities, organic fiber, ammonium chloride and silica sol; the fused corundum powder with different granularities are respectively more than or equal to 99 percent by weight in alumina content and respectively 20-40 meshes, 50-100 meshes and 200-325 meshes in granularity; the fused corundum powder with the granularity of 20-40 meshes is 10-30 percent in mass percentage, the fused corundum powder with the granularity of 50-100 meshes is 20-40 percent in mass percentage, and the fused corundum powder with the granularity of 200-325 meshes is 30-70 percent in mass percentage; the organic fiber is 0.1-3mm in length and 20-200 Mu m in diameter, and the addition amount of the organic fiber is 1-20 percent of the mass of the fused corundum powder; the addition amount of the ammonium chloride is 0.08-0.12 percent of the fused corundum powder; and the mass of the silica sol is 60-70 percent of the total mass of the fused corundum powder, the organic fiber 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: ceramic core for molding of support plate and preparation method thereof.
Technical field
The present invention relates to a kind of investment cast technology of the massive casting with hollow support plate, particularly a kind of for alumina based ceramic core material and preparation method for the moulding of aero-engine casing class annular cast hollow support plate.
Background technology
Increasing the front inlet air temperature of aero-turbine and loss of weight is the main path that improves its thrust-weight ratio.Form the main load parts of aircraft engine, as also increasingly sophisticated in the structure design of the parts such as superalloy rear housing, titanium alloy intermediary casing, therefore its metal matrix material and processing technology thereof have been proposed to harsher requirement.Course and future trend from the development of World Airways developed country, in the situation that motor power is certain, by casing class foundry goods thin-walled property, design and adopt whole smart casting technology, make the loss of weight of engine own and improve reliability, greatly having promoted motor performance, is also one of effective way improving thrust-weight ratio.
Nearly clean shape melted module precise casting technology is to prepare the most important technology of motor case class formation part both at home and abroad.This technology, by adopting the wax material compacting wax-pattern of fusible mistake, is then made ceramic shell, after dewaxing, ceramic shell is carried out to roasting, finally the metal of melting is poured in shell, until metal freezing, cooling after clear shell, obtain required foundry goods.By to mold material and the strict control to each process procedure and technological factor in foundry goods moulding process, can obtain working face without mechanical workout or only carry out the near clean shape foundry goods of detail sanding.Therefore melted module precise casting technology has large thin-wall element and the unitarily formed advantage that casting dimensional precision is high, surfaceness is low, can be used for casting complex-shaped (particularly inner chamber is complicated).
Aero-engine casing base part has some hollow support plates conventionally, in order to obtain its hollow structure, must increase ceramic core in the oblique support plate position in ceramic shell, until casting pouring, solidify, cooling after, first remove shell, then ceramic core is removed by machinery or chemical process from support plate, obtained the casing foundry goods that support plate has hollow structure.
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 fused corundom powder, organic fibre, ammonium chloride and silicon sol; Described varigrained fused corundom 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 object fused corundom powder is 10%-30%, and granularity is that the mass percent of 50-100 object fused corundom powder is 20%-40%, and granularity is that the mass percent of 200-325 object fused corundom powder is 30%-70%; Described organic fibre is one of nylon fiber, polyurethane fiber, tynex, length 0.1-3mm, and diameter 20-200 μ m, add-on is the 1-20% of described fused corundom opaque amount; Described ammonium chloride, is analytical pure, and size-grade distribution is between 200-325 order, and the add-on of ammonium chloride is the 0.08-0.12% of fused corundom powder; Described silicon sol, pH value is 8-10, wherein content >=the 28wt% of silicon dioxide colloid particle; The quality of this silicon sol is the 60-70% of the quality summation of described fused corundom powder, organic fibre and ammonium chloride.
The making method of above-mentioned ceramic core for molding of support plate, comprising:
The first step, preparation powder raw material: above-mentioned varigrained fused corundom powder, organic fibre and ammonium chloride powder are joined in V-type mixer, force to be dry mixed, the rotating speed of V-type mixer is 120 turn/min, mixing time is 12-24h, obtains ceramic core raw material;
Second step, preparation slurry: described ceramic core raw material is joined in silicon sol, with machine,massing mixing 50-70s, obtain ceramic core casting slurry;
The 3rd step, casting: described slurry is poured in the support plate cavity of foundry goods moltening mold castings wax-pattern, solidifies through 8-12min disposed slurry, obtain solid core.This core can be removed after casting pouring, makes the support plate of foundry goods have the hollow structure of certain size and shape.
Below the present invention is further illustrated:
The fused corundom powder adopting in the present invention, is the material of main part that forms ceramic core, because thermal expansivity is very low, so substantially there is no dimensional change in roasting and casting pouring process, is conducive to the control of support plate cavity size precision.
Organic fibre of the present invention, its effect is to provide certain enhancement to the wet base substrate of ceramic core, while avoiding core because of roasting, moisture evaporation causes the generation of cracking phenomena simultaneously; Meanwhile, organic fibre, in Baking process, because of oxidation burn off, makes ceramic core after roasting, produce certain hole, is beneficial to the removing of core.
Ammonium chloride of the present invention, is the solidifying agent of silicon sol, and its effect is to make silicon sol that gelation occur at normal temperatures, and ceramic powder raw material is bonded together, and becomes the ceramic core with some strength.By adjusting the ratio of ammonium chloride and silicon sol, can accurately control the curing time of ceramic core.
Silicon sol 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 hot strength.
The present invention has the following advantages:
(1) to prepare alumina-based ceramic core stupalith main component used be varigrained fused corundom powder in the present invention, and fused corundom is chemical grade α-Al
2o
3through fixed electric furnace or Dumpage type electric furnace smelting process, make, density is high, and sintering activity is low, and thermal expansivity is very little.After forming ceramic core, in roasting and metal melt casting process size because of thermal expansivity lower, so dimensional change is very little, not yielding, is conducive to keep the dimensional precision of support plate cavity;
(2) alumina based ceramic core material of the present invention, can adjust its set time by adjusting the add-on of solidifying agent ammonium chloride, along with the increase of solidifying agent add-on, shortens the set time of ceramic core.The controllability of ceramic core set time has guaranteed that operator can reserve the process that the sufficient time completes core cast;
(3) organic fibre of the present invention, can provide significant enhancement to the wet base substrate of ceramic core, and can avoid the cracking of core in roasting process; Organic fibre, because of high temperature oxidation burn off, can also make ceramic core have certain hole simultaneously, is beneficial to core and from foundry goods support plate, removes after cast.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented take technical solution of the present invention under prerequisite, has provided detailed embodiment and concrete operating process.
Embodiment 1:
Taking granularity is 20-40 object fused corundom powder 1kg, granularity is 50-100 object fused corundom powder 20g, granularity is 200-325 object fused corundom powder 7kg, nylon fiber 0.1kg, ammonium chloride 0.08kg, puts in V-type mixer, is to be dry mixed 12h under the condition of 120 turn/min at rotating speed, obtain ceramic core material powder, standby.
Take silicon sol 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 silicon sol mixing 1min, obtain the good slurry of flowing property; Slurry is poured in the cavity of casting wax mould support plate, after about 10min, slurry curing, obtains having the solid ceramic core of some strength.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, do not occur distortion, and dimensional precision is qualified, after cast finishes, core is more easily removed from support plate cavity.
Embodiment 2:
Taking granularity is 20-40 object fused corundom powder 2kg, granularity is 50-100 object fused corundom powder 3kg, granularity is 200-325 object fused corundom powder 3kg, polyurethane fiber 0.25kg, ammonium chloride 0.10kg, puts into and puts into V-type mixer, is to be dry mixed 18h under the condition of 120 turn/min at rotating speed, obtain ceramic core material powder, standby.
Take silicon sol 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 silicon sol mixing 1min, obtain the good slurry of flowing property; Slurry is poured in the cavity of casting wax mould support plate, after about 8min, slurry curing, obtains having the solid ceramic core of some strength.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, do not occur distortion, and dimensional precision is qualified, after cast finishes, core is easily removed from support plate cavity.
Embodiment 3:
Taking granularity is 20-40 object fused corundom powder 3kg, granularity is 50-100 object fused corundom powder 3kg, granularity is 200-325 object fused corundom powder 3kg, tynex 0.5kg, ammonium chloride 0.12kg, puts into and puts into V-type mixer, is to be dry mixed 24h under the condition of 120 turn/min at rotating speed, obtain ceramic core material powder, standby.
Take silicon sol 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 silicon sol mixing 1min, obtain the good slurry of flowing property; Slurry is poured in the cavity of casting wax mould support plate, after about 5min, slurry curing, obtains having the solid ceramic core of some strength.
By the pouring experiment of the actual part of casing, show that the wall thickness of casing support plate is even, do not occur distortion, and dimensional precision is qualified, after cast finishes, core is defeated and dispersed voluntarily, is easy to remove.
Claims (2)
1. a ceramic core for molding of support plate, is characterized in that comprising: varigrained fused corundom powder, organic fibre, ammonium chloride and silicon sol;
Described varigrained fused corundom 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 object fused corundom powder is 10%-30%, and granularity is that the mass percent of 50-100 object fused corundom powder is 20%-40%, and granularity is that the mass percent of 200-325 object fused corundom powder is 30%-70%;
Described organic fibre is one of nylon fiber, polyurethane fiber, tynex, length 0.1-3mm, and diameter 20-200 μ m, add-on is the 1-20% of described fused corundom opaque amount;
Described ammonium chloride, is analytical pure, and size-grade distribution is between 200-325 order, and the add-on of ammonium chloride is the 0.08-0.12% of fused corundom powder;
Described silicon sol, pH value is 10, wherein content >=28 wt% of silicon dioxide colloid particle; The quality of this silicon sol be described fused corundom powder, organic fibre and ammonium chloride quality summation 60%.
2. a making method for ceramic core for molding of support plate claimed in claim 1, is characterized in that comprising:
The first step, preparation powder raw material: varigrained fused corundom powder, organic fibre and ammonium chloride powder are joined in V-type mixer, force to be dry mixed, the rotating speed of V-type mixer is 120 turn/min, and mixing time is 24h, obtains ceramic core raw material;
Second step, preparation slurry: described ceramic core raw material is joined in silicon sol, with machine,massing mixing 70s, obtain ceramic core casting slurry;
The 3rd step, 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 solid core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310044916.2A CN103073319B (en) | 2011-12-13 | 2011-12-13 | Alumina-based ceramic core for support plate forming |
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| CN201310044916.2A CN103073319B (en) | 2011-12-13 | 2011-12-13 | Alumina-based ceramic core for support plate forming |
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| CN 201110413926 Division CN102489670B (en) | 2011-12-13 | 2011-12-13 | Ceramic core for molding of support plate and preparation method thereof |
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| CN103073319A CN103073319A (en) | 2013-05-01 |
| CN103073319B true CN103073319B (en) | 2014-01-15 |
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| CN111995414B (en) * | 2020-07-31 | 2022-06-17 | 西安欧中材料科技有限公司 | Polyacrylonitrile-based carbon fiber reinforced ceramic core and preparation method thereof |
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| CN102039375B (en) * | 2010-11-20 | 2013-03-13 | 沈阳工业大学 | Method for quickly manufacturing high-temperature alloy hollow blade casting |
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Owner name: JIANGSU TUNAN ALLOYS CO., LTD. Free format text: FORMER NAME: DANYANG PRECISION ALLOY FACTORY CO., LTD. |
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Address after: 212000, Jiangsu, Zhenjiang Province, Danyang City, Lu Town, 1 Military and civilian canal West Patentee after: Jiangsu Tu Nan alloy limited company Address before: 212000, No. 1, army West Road, Yunhe Town, Zhenjiang City, Jiangsu Province, Danyang Patentee before: Danyang Precision Alloy Factory Co., Ltd. |