CN103073272B - Production method of ceramic core for support plate forming - Google Patents
Production method of ceramic core for support plate forming Download PDFInfo
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- CN103073272B CN103073272B CN201310045286.0A CN201310045286A CN103073272B CN 103073272 B CN103073272 B CN 103073272B CN 201310045286 A CN201310045286 A CN 201310045286A CN 103073272 B CN103073272 B CN 103073272B
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Abstract
The invention relates to a production method of a ceramic core for support plate forming. The production method comprises the following steps of: weighing 2kg of fused corundum powder with the granularity of 20-40 meshes, 3kg of fused corundum powder with the granularity of 50-100 meshes, 3kg of fused corundum powder with the granularity of 200-325 meshes, 0.25kg of polyurethane fiber and 0.10kg of ammonium chloride, putting all the raw materials into a V-shaped blending machine, and carrying out dry blending for 18h under the condition that the rotating speed is 120 turns/min to obtain ceramic core raw-material powder for later use, wherein the alumina contents of the fused corundum powder with different granularities are respectively more than or equal to 99 percent by weight, and the polyurethane fiber is 0.1-3mm in length and 20-200Mu m in diameter; weighing 400g of silica sol, putting the silica sol into a 1000ml beaker, weighing 600g of ceramic core raw-material powder into the beaker, and mixing the raw-material powder and the silica sol for 1min under the condition of intense agitation to obtain slurry, wherein the pH value of the silica sol is 8-10 and the content of silica sol particles is more than or equal to 28 percent by weight; and casting the slurry to a cavity of a casting wax mould support plate, and after 8min, curing the slurry to obtain the solid ceramic core.
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 (1)
1. the making method of a ceramic core for molding of support plate, it is characterized in that comprising: 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, put in V type mixer, at rotating speed, be to be dry mixed 18h under the condition of 120 turn/min, obtain ceramic core material powder, standby; Wherein, described granularity is 20-40 order, 50-100 order, 200-325 object fused corundom powder, its alumina content >=99wt%; The length 0.1-3mm of described polyurethane fiber, diameter 20-200 μ m;
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 slurry; Wherein, described silicon sol, pH value is 8-10, wherein content >=the 28wt% of silicon dioxide colloid particle;
Slurry is poured in the cavity of casting wax mould support plate, after 8min, slurry curing, obtains solid ceramic core.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310045286.0A CN103073272B (en) | 2011-12-13 | 2011-12-13 | Production method of ceramic core for support plate forming |
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| CN201310045286.0A CN103073272B (en) | 2011-12-13 | 2011-12-13 | Production method of 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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| CN103073272A CN103073272A (en) | 2013-05-01 |
| CN103073272B true CN103073272B (en) | 2014-03-05 |
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| CN103586413B (en) * | 2013-11-18 | 2016-01-06 | 中国南方航空工业(集团)有限公司 | A kind of casting method of multi-cavity structural part |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102093040A (en) * | 2010-12-07 | 2011-06-15 | 山东理工大学 | Composite ceramic mold core for water pump impeller and preparation method thereof |
| CN102093064A (en) * | 2010-12-21 | 2011-06-15 | 北京联合荣大工程材料有限责任公司 | Refractory spray coating with high steel fiber content and spraying method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102093040A (en) * | 2010-12-07 | 2011-06-15 | 山东理工大学 | Composite ceramic mold core for water pump impeller and preparation method thereof |
| CN102093064A (en) * | 2010-12-21 | 2011-06-15 | 北京联合荣大工程材料有限责任公司 | Refractory spray coating with high steel fiber content and spraying method thereof |
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