CN103056303A - Ceramic core for supporting plate forming - Google Patents
Ceramic core for supporting plate forming Download PDFInfo
- Publication number
- CN103056303A CN103056303A CN2013100449853A CN201310044985A CN103056303A CN 103056303 A CN103056303 A CN 103056303A CN 2013100449853 A CN2013100449853 A CN 2013100449853A CN 201310044985 A CN201310044985 A CN 201310044985A CN 103056303 A CN103056303 A CN 103056303A
- Authority
- CN
- China
- Prior art keywords
- ceramic core
- powder
- granularity
- slurry
- weighing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Producing Shaped Articles From Materials (AREA)
Abstract
The invention relates to a method for manufacturing a ceramic core for supporting plate forming. The method comprises the steps of weighing 1kg of fused alumina powder with the granularity of 20-40 meshes, 20g of fused alumina powder with the granularity of 50-100 meshes, 7kg of fused alumina powder with the granularity of 200-325 meshes, 0.1kg of nylon fiber and 0.08kg of ammonium chloride, putting the materials into a V-shaped mixer, and performing dry mixing on the materials for 12h under the condition of the rotating speed of 120 revolutions per minute to obtain the ceramic core raw material powder for later use, wherein the alumina content in the fused alumina powder with different granularities is more than or equal to 99 weight percent, and the nylon fiber has the length of 0.1-3mm and the diameter of 20-200 mu m; weighing 400g of silica sol, putting the silica sol into a 1000ml beaker, then weighing 600g of the raw material powder, putting the raw material powder into the beaker, and mixing the raw material powder with the silica sol for 1 minute by using a powerful stirring machine to obtain slurry; and pouring the slurry into a cavity of a casting wax mould supporting plate, curing the slurry within 10 minutes, and thus obtaining 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 model casting technology of the heavy castings 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 intake 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 aero-engine, also increasingly sophisticated such as the structural design of the 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.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 engine 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 engine crankcase 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 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 the casting dimensional accuracy is high, surface roughness 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-core construction, 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 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 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 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.
The preparation method of above-mentioned ceramic core for molding of support plate 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 be dry mixed, the rotating speed of V-type batch mixer is 120 to turn/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 consists of 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 are to provide certain humidification 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 fiber 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 curing agent of Ludox, and its effect is to make Ludox 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 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, density is high, and 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 sufficient time and finish the process of 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
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 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 120 to turn/be dry mixed 12h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing Ludox 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 Ludox mixing 1min, obtain the good slurry of mobile performance; 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 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 120 to turn/be dry mixed 18h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing Ludox 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 Ludox mixing 1min, obtain the good slurry of mobile performance; 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 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 120 to turn/be dry mixed 24h under the condition of min, obtain the ceramic core material powder, for subsequent use.
Take by weighing Ludox 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 Ludox mixing 1min, obtain the good slurry of mobile performance; 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 accuracy is qualified, after cast finished, core was defeated and dispersed voluntarily, was easy to remove.
Claims (1)
1. the preparation method of a ceramic core for molding of support plate, it is characterized in that comprising: 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, put in the V-type batch mixer, at rotating speed be 120 turn/be dry mixed 12h under the condition of min, obtain the ceramic core material powder, for subsequent use; Wherein, described varigrained electro-corundum powder, its alumina content 〉=99wt%; The length 0.1-3mm of described nylon fiber, diameter 20-200 μ m;
Take by weighing Ludox 400g, put in the beaker of 1000ml, then take by weighing above-mentioned raw materials powder 600g, join in the beaker, make material powder and Ludox mixing 1min with machine,massing, obtain slurry; Wherein, described Ludox, 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 10min, slurry curing obtains the solid ceramic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100449853A CN103056303A (en) | 2011-12-13 | 2011-12-13 | Ceramic core for supporting plate forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100449853A CN103056303A (en) | 2011-12-13 | 2011-12-13 | Ceramic core for supporting plate forming |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110413926 Division CN102489670B (en) | 2011-12-13 | 2011-12-13 | Ceramic core for molding of support plate and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103056303A true CN103056303A (en) | 2013-04-24 |
Family
ID=48099357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100449853A Pending CN103056303A (en) | 2011-12-13 | 2011-12-13 | Ceramic core for supporting plate forming |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103056303A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085073A (en) * | 2021-11-10 | 2022-02-25 | 中国科学院金属研究所 | Photocuring 3D printing silicon-based ceramic core and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101229975A (en) * | 2008-01-04 | 2008-07-30 | 西北工业大学 | Method for making alumina ceramic core and core leach method |
| US20080216983A1 (en) * | 2007-03-09 | 2008-09-11 | Richard Whitton | Method for precision casting of metallic components with thin passage ducts |
| CN101537474A (en) * | 2008-03-20 | 2009-09-23 | 上海市机械制造工艺研究所有限公司 | Ceramic core for silica sol precision casting and manufacturing process thereof |
| CN101890480A (en) * | 2010-07-12 | 2010-11-24 | 华中科技大学 | Method for quickly forming and manufacturing ceramic core |
| CN102039375A (en) * | 2010-11-20 | 2011-05-04 | 沈阳工业大学 | Method for quickly manufacturing high-temperature alloy hollow blade casting |
| 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 |
-
2011
- 2011-12-13 CN CN2013100449853A patent/CN103056303A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080216983A1 (en) * | 2007-03-09 | 2008-09-11 | Richard Whitton | Method for precision casting of metallic components with thin passage ducts |
| CN101229975A (en) * | 2008-01-04 | 2008-07-30 | 西北工业大学 | Method for making alumina ceramic core and core leach method |
| CN101537474A (en) * | 2008-03-20 | 2009-09-23 | 上海市机械制造工艺研究所有限公司 | Ceramic core for silica sol precision casting and manufacturing process thereof |
| CN101890480A (en) * | 2010-07-12 | 2010-11-24 | 华中科技大学 | Method for quickly forming and manufacturing ceramic core |
| CN102039375A (en) * | 2010-11-20 | 2011-05-04 | 沈阳工业大学 | Method for quickly manufacturing high-temperature alloy hollow blade casting |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085073A (en) * | 2021-11-10 | 2022-02-25 | 中国科学院金属研究所 | Photocuring 3D printing silicon-based ceramic core and preparation method thereof |
| CN114085073B (en) * | 2021-11-10 | 2023-01-10 | 中国科学院金属研究所 | Photocuring 3D printing silicon-based ceramic core and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102489670B (en) | Ceramic core for molding of support plate and preparation method thereof | |
| CN103286273B (en) | Making method of ceramic core for molding of casing annular casting hollow support plate | |
| CN100506428C (en) | Method for direct production of core in narrow groove and blind hole of wax mould | |
| CN102039375B (en) | Method for quickly manufacturing high-temperature alloy hollow blade casting | |
| CN103056302A (en) | Ceramic core for molding aeroengine case type annular casting hollow support plate | |
| CN105522112B (en) | Magnesium alloy investment casting high collapsibility ceramic shell and preparation method thereof | |
| CN103231021B (en) | Alumina-based ceramic core and preparation method thereof | |
| CN102351519A (en) | Cast ceramic core and preparation method thereof | |
| CA2381843C (en) | Method and device for producing reticular structures | |
| CN101658918A (en) | Water glass type magnesium alloy fusible pattern casting process | |
| CN102806310B (en) | Metal component casting process | |
| JPWO2005080023A1 (en) | Casting manufacturing method | |
| CN103008547A (en) | Resin sand shell mold casting method of automotive turbocharger shell | |
| CN107838402A (en) | A kind of manufacture method of complicated magnesium alloy structural part | |
| CN100469731C (en) | Composite alumina ceramic core material adopting alumina hollow sphere and its forming preparation process | |
| CN102836966A (en) | Casting cooling process for shell of central refrigeration compressor | |
| CN103073319B (en) | Alumina-based ceramic core for support plate forming | |
| CN109834220A (en) | A kind of aluminium alloy full form casting process | |
| CN103073272B (en) | Production method of ceramic core for support plate forming | |
| CN104550725A (en) | Method for investment casting automobile heat-resistant steel exhaust manifold | |
| CN103056303A (en) | Ceramic core for supporting plate forming | |
| JPS6317020B2 (en) | ||
| CN101372033A (en) | Self-spreading method for quickly casting armored vehicle aluminium alloy part or blank for emergency in battlefield | |
| CN114682729A (en) | Preparation method of precision casting silica sol shell | |
| CN112828241B (en) | Casting heating coating and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130424 |