CN103073272A - 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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- CN103073272A CN103073272A CN2013100452860A CN201310045286A CN103073272A CN 103073272 A CN103073272 A CN 103073272A CN 2013100452860 A CN2013100452860 A CN 2013100452860A CN 201310045286 A CN201310045286 A CN 201310045286A CN 103073272 A CN103073272 A CN 103073272A
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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 the moulding of aero-engine casing class annular cast hollow support plate with alumina based ceramic core material and preparation method.
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.Consist of the main load parts of aircraft engine, also increasingly sophisticated such as the structure design of the parts such as superalloy rear housing, titanium alloy intermediary casing, therefore harsher requirement has been proposed for its metal matrix material and processing technology thereof.Course and future trend from the development of World Airways developed country, in 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, greatly having promoted motor performance, 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 motor case class formation spare both at home and abroad.Then this technology makes ceramic shell by adopting the wax material compacting wax-pattern of fusible mistake, after the dewaxing ceramic shell is carried out roasting, at last with the casting of metals of melting in shell, clear shell namely obtains required foundry goods after metal freezing, cooling.By to mold material and to the strict control of each process procedure and technological factor in the foundry goods moulding process, can obtain the near clean shape foundry goods that working face need not mechanical workout or only carries out detail sanding.Therefore melted module precise casting technology has large thin-wall element and the unitarily formed advantage that the casting dimensional precision is high, surfaceness is low, can be used for casting complex-shaped (particularly inner chamber is complicated).
The aero-engine casing base part has some hollow support plates usually, in order to obtain its hollow structure, must increase ceramic core in the oblique support plate position in ceramic shell, until casting pouring, solidify, cool off after, at first remove shell, then ceramic core is removed with machinery or chemical process from support plate, namely 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 provides a kind of ceramic core for molding of support plate 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 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 purpose fused corundom powder is 10%-30%, and granularity is that the mass percent of 50-100 purpose fused corundom powder is 20%-40%, and granularity is that the mass percent of 200-325 purpose 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 the 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 are 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 comprises:
The first step, the preparation powder raw material: above-mentioned varigrained fused corundom powder, organic fibre and ammonium chloride powder are joined in the V-type mixer, force to be dry mixed, the rotating speed of V-type mixer is 120 to turn/min, mixing time is 12-24h, namely obtains the ceramic core raw material;
Second step, preparation slurry: described ceramic core raw material is joined in the silicon sol, with machine,massing mixing 50-70s, namely 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 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 structure of certain size and shape.
Below the present invention is further illustrated:
The fused corundom powder that adopts among the present invention is the material of main part that consists of ceramic core, because thermal expansivity is very low, so substantially do not have 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 are to provide certain enhancement to the wet base substrate of ceramic core, and the moisture evaporation causes the generation of cracking phenomena when avoiding simultaneously core because of roasting; Simultaneously, organic fibre because of the oxidation burn off, makes ceramic core produce certain hole after roasting in the Baking process, 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 namely occur at normal temperatures, and the 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 time that ceramic core solidifies.
Silicon sol 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 hot strength.
The present invention has the following advantages:
(1) to prepare the used stupalith main component of alumina-based ceramic core be varigrained fused corundom powder in the present invention, and fused corundom is chemical grade α-Al
2O
3Make through fixed electric furnace or Dumpage type electric furnace smelting process, density is high, and sintering activity is low, and thermal expansivity is very little.After forming ceramic core, size is lower because of thermal expansivity in roasting and metal melt casting process, so dimensional change is very little, and is 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 the add-on of adjusting solidifying agent ammonium chloride, namely shortens along with the increase of solidifying agent add-on the set time of ceramic core.The controllability of ceramic core set time has guaranteed that the operator can reserve the sufficient time and finish the process of 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 can also make ceramic core have certain hole because of the high temperature oxidation burn off simultaneously, is beneficial to core and removes from the foundry goods support plate after cast.
Embodiment
The below elaborates to embodiments of the invention: present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed embodiment and concrete operating process.
Embodiment 1:
Taking by weighing granularity is 20-40 purpose fused corundom powder 1kg, granularity is 50-100 purpose fused corundom powder 20g, granularity is 200-325 purpose fused corundom powder 7kg, nylon fiber 0.1kg, ammonium chloride 0.08kg puts in the V-type mixer, at rotating speed is 120 to turn/be dry mixed 12h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing silicon sol 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the 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, behind about 10min, slurry curing namely 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, distortion do not occur, and dimensional precision 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 fused corundom powder 2kg, granularity is 50-100 purpose fused corundom powder 3kg, granularity is 200-325 purpose fused corundom powder 3kg, polyurethane fiber 0.25kg, ammonium chloride 0.10kg puts into and puts into the V-type mixer, at rotating speed is 120 to turn/be dry mixed 18h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing silicon sol 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the 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, behind about 8min, slurry curing namely 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, distortion do not occur, and dimensional precision is qualified, after cast finished, core was easily removed from the support plate cavity.
Embodiment 3:
Taking by weighing granularity is 20-40 purpose fused corundom powder 3kg, granularity is 50-100 purpose fused corundom powder 3kg, granularity is 200-325 purpose fused corundom powder 3kg, tynex 0.5kg, ammonium chloride 0.12kg puts into and puts into the V-type mixer, at rotating speed is 120 to turn/be dry mixed 24h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing silicon sol 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the 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, behind about 5min, slurry curing namely 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, distortion do not occur, and dimensional precision is qualified, after cast finished, core was defeated and dispersed voluntarily, was 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 by weighing granularity is 20-40 purpose fused corundom powder 2kg, granularity is 50-100 purpose fused corundom powder 3kg, granularity is 200-325 purpose fused corundom powder 3kg, polyurethane fiber 0.25kg, ammonium chloride 0.10kg, put into and put into the V-type mixer, at rotating speed be 120 turn/be dry mixed 18h under the condition of min, obtain the ceramic core material powder, for subsequent use; Wherein, described varigrained fused corundom powder, its alumina content 〉=99wt%; The length 0.1-3mm of described polyurethane fiber, diameter 20-200 μ m;
Take by weighing silicon sol 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the beaker, under the condition of strong stirring, make material powder and silicon sol mixing 1min, obtain slurry; Wherein, described silicon sol, the 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, behind the 8min, slurry curing namely obtains the 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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| 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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| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586413A (en) * | 2013-11-18 | 2014-02-19 | 中国南方航空工业(集团)有限公司 | Precision casting method for 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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Patent 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586413A (en) * | 2013-11-18 | 2014-02-19 | 中国南方航空工业(集团)有限公司 | Precision casting method for multi-cavity structural part |
| 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 |
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| CN103073272B (en) | 2014-03-05 |
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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. |