CN1962536A - Magnesia ceramic core and its injection moulding process - Google Patents
Magnesia ceramic core and its injection moulding process Download PDFInfo
- Publication number
- CN1962536A CN1962536A CN 200610134644 CN200610134644A CN1962536A CN 1962536 A CN1962536 A CN 1962536A CN 200610134644 CN200610134644 CN 200610134644 CN 200610134644 A CN200610134644 A CN 200610134644A CN 1962536 A CN1962536 A CN 1962536A
- Authority
- CN
- China
- Prior art keywords
- ceramic core
- magnesia
- aluminum oxide
- powder
- beeswax
- 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.)
- Granted
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a magnesia ceramic core, which comprises the following steps: allocating the raw material with 60-90% magnesia, 1-20% alumina, 5-20% paraffin, 0.25-0.5% beeswax, 0.05-0.25% polyethene and 0.1-1% titanic acid ester; preparing material spindle; injecting spindle into several shaped core green compacts through ceramic core injecting mould; sintering the green compact into magnesia ceramic core at 1200-1400 Deg C. The cast possesses smooth surface with surface roughness not more than 10um, which is fit for casting high-temperature alloy and alloy steel such as alloy with Al, Hf and C and ZGCr17Ni2 stainless steel.
Description
Technical field: the present invention relates to a kind of ceramic core material and preparation method thereof, especially a kind of magnesia ceramic core and injection molding manufacture craft thereof are mainly used in the precision casting field.
Background technology: ceramic core is as the adaptor that forms precision castings hollow lumen structure, and its effect is: form the cavity shape of precision castings, and with the dimensional precision of epimorph and formwork common guarantee precision castings wall thickness.After the foundry goods casting is finished, ceramic core is removed from foundry goods by machinery or chemolysis.Precision casting now is many based on silica-based with ceramic core, silica-based core be used in a large number cast Ni base, Co based high-temperature alloy, and obtained good effect.But when use temperature surpasses 1550 ℃, the high-temperature stability of silica-based core descends, creep strain easily takes place, cause the qualification rate of foundry goods very low, when particularly containing Al, Hf and C in the alloy, can chemical reaction take place with it at silica-based core more than 1550 ℃, make the foundry goods endoporus produce defectives such as a large amount of pores and scab.Though aluminium base core use temperature is higher, because its body material, the ubiquity depoling time is long, the depoling complex process, the depoling apparatus expensive, environmental pollution is serious, defective such as harmful has limited aluminium base core and has been applied to more wide field.In addition, when ceramic core is produced adopt the hot-injection molding technologies more because this technological forming pressure little (2.7-4.0MPa), easily produce intensity low, burn till and shrink defectives such as big.
Summary of the invention: at above-mentioned the deficiencies in the prior art, the invention provides that a kind of technology is simple, forming pressure is high, resistant to elevated temperatures magnesia ceramic core and injection molding manufacture craft thereof.
For achieving the above object, the technical solution used in the present invention is: magnesia ceramic core, and its raw material weight per-cent is: magnesium oxide 60-90%, aluminum oxide 1-20%, paraffin 5-20%, beeswax 0.25-0.5%, polyethylene 0.05-0.25%, titanic acid ester 0.1-1%.
The injection molding manufacture craft of magnesia ceramic core is as follows: with the magnesia powder base-material of deciding, aluminum oxide powder is crossed 325 mesh standard sieves, gets the lower part of screen branch.Then main base-material and aluminum oxide powder are pressed following mixed: magnesium oxide 60-90%, aluminum oxide 1-20%, titanic acid ester 0.1-1%, it is standby to make powder in 2 hours 105 ℃ of heating after mixing; Paraffin 5-20%, beeswax 0.25-0.5%, polyethylene 0.05-0.25% mixes under 130 ℃, and it is standby that mistake 325 mesh standard sieves are made softening agent.Mixer is warming up to 130 ℃, and adding prepares softening agent, adds the above-mentioned powder that mixes then while stirring, and powder all adds the back to be continued to stir 12 hours, pours out the finish mix ingot of cooling.Above-mentioned material ingot is made the ceramic core green compact of some shapes according to mould by following technical parameter with the ceramic core injection moulding machine: 90-120 ℃ of material cylinder temperature; 90-100 ℃ of nozzle temperature; Compacting pressure 4-20Mpa; 2-10 second inject time; Dwell time 10-30 second; Die temperature 30-40 ℃.Green compact make magnesia ceramic core through 1200-1400 ℃ of high-temperature roasting.
The present invention is fit to the ceramic core with injection molding technique continuous production complicated shape, and the magnesia ceramic core use temperature of making is not less than 1600 ℃, does not react with casting metal under the hot conditions, and cast(ing) surface is smooth, and surfaceness is not more than 10 μ m; Suitable casting contains Al, and superalloy and steel alloys such as the alloy of Hf and C and ZGCr17Ni2 red fox alloy have remedied when using silica-based core to cast this type of material, and the foundry goods endoporus can produce defectives such as a large amount of pores and scab; Molten mistake is good, can well be dissolved in the weak acid, and the depoling time is short, and depoling equipment is simple, and depoling technology is pollution-free, safe and reliable, has reduced the precision casting cost; Hot tearing does not take place in cast hollow thin-wall foundry goods; Core dimensional precision height; Enough intensity is arranged, indeformable when moulding, carrying and shove charge, not broken.
Embodiment:
Embodiment one
Get the magnesium oxide 90% that mixes, aluminum oxide 2.2%, cross 325 mesh standard sieves, get the lower part of screen and divide and to mix with titanic acid ester 1%, mix afterwards 105 ℃ heat 2 hours standby, get paraffin 6.5%, beeswax 0.25%, polyethylene 0.05% mixes under 130 ℃, and it is standby that mistake 325 mesh standard sieves are made softening agent.Mixer is warming up to 130 ℃, and adding prepares softening agent, adds the above-mentioned powder that mixes then while stirring, and powder all adds the back to be continued to stir 12 hours, pours out the finish mix ingot of cooling.
Embodiment two
Get the magnesium oxide 60% that mixes, aluminum oxide 20%, cross 325 mesh standard sieves, get the lower part of screen and divide and to mix with titanic acid ester 0.27%, mix afterwards 105 ℃ heat 2 hours standby, get paraffin 19%, beeswax 0.5%, polyethylene 0.23% mixes under 130 ℃, and it is standby that mistake 325 mesh standard sieves are made softening agent.Mixer is warming up to 130 ℃, and adding prepares softening agent, adds the above-mentioned powder that mixes then while stirring, and powder all adds the back to be continued to stir 12 hours, pours out the finish mix ingot of cooling.
Embodiment three
Get the magnesium oxide 80% that mixes, aluminum oxide 8.9%, cross 325 mesh standard sieves, get the lower part of screen and divide and to mix with titanic acid ester 0.8%, mix afterwards 105 ℃ heat 2 hours standby, get paraffin 10%, beeswax 0.25%, polyethylene 0.05% mixes under 130 ℃, and it is standby that mistake 325 mesh standard sieves are made softening agent.Mixer is warming up to 130 ℃, and adding prepares softening agent, adds the above-mentioned powder that mixes then while stirring, and powder all adds the back to be continued to stir 12 hours, pours out the finish mix ingot of cooling.
Above-mentioned material ingot is made the ceramic core green compact of some shapes according to mould by following technical parameter with the ceramic core injection moulding machine: 90-120 ℃ of material cylinder temperature, 90-100 ℃ of nozzle temperature, compacting pressure 4-20Mpa, 2-10 second inject time, dwell time 10-30 second, die temperature 30-40 ℃.Green compact make magnesia ceramic core through 1200-1400 ℃ of high-temperature roasting.
Claims (5)
1, magnesia ceramic core, its raw material weight per-cent is: magnesium oxide 60-90%, aluminum oxide 1-20%, paraffin 5-20%, beeswax 0.25-0.5%, polyethylene 0.05-0.25%, titanic acid ester 0.1-1%.
2, magnesia ceramic core as claimed in claim 1, its raw material weight per-cent is: magnesium oxide 90%, aluminum oxide 2.2%, paraffin 6.5%, beeswax 0.25%, polyethylene 0.05%, titanic acid ester 1%.
3, magnesia ceramic core as claimed in claim 1, its raw material weight per-cent is: magnesium oxide 60%, aluminum oxide 20%, paraffin 19%, beeswax 0.5%, polyethylene 0.23%, titanic acid ester 0.27%.
4, magnesia ceramic core as claimed in claim 1, its raw material weight per-cent is: magnesium oxide 80%, aluminum oxide 8.9%, paraffin 10%, beeswax 0.25%, polyethylene 0.05%, titanic acid ester 0.8%.
5, a kind of preparation is as follows as the injection molding manufacture craft of claim 1 or 2 or 3 or 4 described magnesia ceramic cores: with the magnesia powder base-material of deciding, aluminum oxide powder is crossed 325 mesh standard sieves, gets the lower part of screen branch; Then main base-material and aluminum oxide powder are pressed following mixed: magnesium oxide 60-90%, aluminum oxide 1-20%, titanic acid ester 0.1-1%, it is standby to make powder in 2 hours 105 ℃ of heating after mixing; Paraffin 5-20%, beeswax 0.25-0.5%, polyethylene 0.05-0.25% mixes under 130 ℃, and it is standby that mistake 325 mesh standard sieves are made softening agent; Mixer is warming up to 130 ℃, and adding prepares softening agent, adds the above-mentioned powder that mixes then while stirring, and powder all adds the back to be continued to stir 12 hours, pours out the finish mix ingot of cooling; Above-mentioned material ingot is made the ceramic core green compact of some shapes according to mould by following technical parameter with the ceramic core injection moulding machine: 90-120 ℃ of material cylinder temperature, 90-100 ℃ of nozzle temperature, compacting pressure 4-20Mpa, 2-10 second inject time, dwell time 10-30 second, die temperature 30-40 ℃; Green compact make magnesia ceramic core through 1200-1400 ℃ of high-temperature roasting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101346445A CN100402461C (en) | 2006-12-08 | 2006-12-08 | Magnesia ceramic core and its injection moulding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101346445A CN100402461C (en) | 2006-12-08 | 2006-12-08 | Magnesia ceramic core and its injection moulding process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1962536A true CN1962536A (en) | 2007-05-16 |
| CN100402461C CN100402461C (en) | 2008-07-16 |
Family
ID=38081789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101346445A Expired - Fee Related CN100402461C (en) | 2006-12-08 | 2006-12-08 | Magnesia ceramic core and its injection moulding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100402461C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103319159A (en) * | 2013-06-25 | 2013-09-25 | 河南飞孟金刚石工业有限公司 | Production process of magnesium cups |
| CN107417260A (en) * | 2017-09-06 | 2017-12-01 | 盐城市华康电热绝缘材料厂 | The hot pressing method for preparing of magnesia ceramics |
| CN110078477A (en) * | 2019-04-26 | 2019-08-02 | 东南大学 | A kind of magnesia ceramic core and preparation method thereof |
| CN111153629A (en) * | 2020-04-02 | 2020-05-15 | 佛山市恒之芯复合材料有限公司 | Manufacturing process of sintering-free ceramic core |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3395211B2 (en) * | 1992-07-24 | 2003-04-07 | 三菱マテリアル株式会社 | Method for producing thin hollow metal article |
| DE19530254A1 (en) * | 1995-08-17 | 1997-02-20 | Gerhard Dr Ing Betz | Forming metal or plastic castings with large internal cavities in two=stage process using melt-out hollow core |
| JP3365711B2 (en) * | 1996-06-10 | 2003-01-14 | 株式会社合同鋳物技術 | Water soluble core for hollow molding |
| CN1074326C (en) * | 1997-11-26 | 2001-11-07 | 北京航空航天大学 | Process for making cores for casting process |
| CN100333857C (en) * | 2005-11-29 | 2007-08-29 | 辽宁省轻工科学研究院 | Methd for preparing core of hollow ceramic |
-
2006
- 2006-12-08 CN CNB2006101346445A patent/CN100402461C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103319159A (en) * | 2013-06-25 | 2013-09-25 | 河南飞孟金刚石工业有限公司 | Production process of magnesium cups |
| CN107417260A (en) * | 2017-09-06 | 2017-12-01 | 盐城市华康电热绝缘材料厂 | The hot pressing method for preparing of magnesia ceramics |
| CN110078477A (en) * | 2019-04-26 | 2019-08-02 | 东南大学 | A kind of magnesia ceramic core and preparation method thereof |
| CN110078477B (en) * | 2019-04-26 | 2021-08-10 | 东南大学 | Magnesium oxide ceramic core and preparation method thereof |
| CN111153629A (en) * | 2020-04-02 | 2020-05-15 | 佛山市恒之芯复合材料有限公司 | Manufacturing process of sintering-free ceramic core |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100402461C (en) | 2008-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101372421A (en) | Yttria ceramic core material for casting single crystal and moulding preparation thereof | |
| CN102079653B (en) | Method for producing silicon-based ceramic core for aircraft engine blade | |
| CN105732014B (en) | A kind of silicon-base ceramic core preparation method | |
| US20160175923A1 (en) | Composite core for casting processes, and processes of making and using the same | |
| CN109734425B (en) | Laser selective rapid forming method of complex phase ceramic casting mold and product thereof | |
| CN101429023A (en) | Compound zirconia ceramics core material employing inorfil | |
| CN105777114A (en) | Preparation method of water-soluble ceramic core | |
| CN1793033A (en) | Ceramic core material for precision casting of Titanium alloy | |
| CN106927798B (en) | Water-soluble ceramic core and preparation method thereof | |
| CN110181001A (en) | A kind of precision casting process of superalloy turbine | |
| CN100469731C (en) | Composite alumina ceramic core material adopting alumina hollow sphere and its forming preparation process | |
| CN103360079A (en) | Method for customizing core and shell of integrated ceramic mold of hollow turbine blade | |
| CN110732637A (en) | turbine blade air film hole precision forming method | |
| CN100402461C (en) | Magnesia ceramic core and its injection moulding process | |
| CN104972063A (en) | Method for manufacturing wax mould for precision investment casting | |
| CN110078477B (en) | Magnesium oxide ceramic core and preparation method thereof | |
| CN101947648B (en) | Method for producing large zirconium and zirconium alloy casting | |
| CN102976762A (en) | Method for preparing zirconia ceramic product | |
| CN104073673A (en) | Preparation method of ceramic reinforced metal-based composite material | |
| CN101429024A (en) | Compound ceramic mould core material employing nano-zirconium oxide | |
| CN104788082A (en) | Improved alumina ceramic core and preparation method thereof | |
| CN104692777B (en) | The preparation of a kind of high porosity ceramic core and the quick-fried depoling method of water thereof | |
| CN106083005A (en) | High porosity easily removes silicon-base ceramic core preparation method | |
| CN103553621B (en) | The preparation method of silicon carbide hydrogen collector | |
| CN104446475A (en) | Ceramic core for single-crystal casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080716 Termination date: 20151208 |
|
| EXPY | Termination of patent right or utility model |