CN1049166C - Coating for casting thin foundry goods - Google Patents
Coating for casting thin foundry goods Download PDFInfo
- Publication number
- CN1049166C CN1049166C CN97116980A CN97116980A CN1049166C CN 1049166 C CN1049166 C CN 1049166C CN 97116980 A CN97116980 A CN 97116980A CN 97116980 A CN97116980 A CN 97116980A CN 1049166 C CN1049166 C CN 1049166C
- Authority
- CN
- China
- Prior art keywords
- coating
- casting
- shell
- powder
- asbestos
- 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.)
- Expired - Fee Related
Links
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to paint particularly suitable for casting castings with thin walls and special castings with great thickness difference, which belongs to the technical field of precision casting. The paint is prepared from the following components: 30 to 50% of binding agent, 40% to 60% of refractory powder and 5% to 15% of heat-insulating material, wherein the binding agent is one of colloidal silica and ethyl silicate hydrolysate; the refractory powder is one of ostranite and quartz powder, corundum powder and bauxite; the heat-insulating material is heat-insulating asbestos or the mixture of heat-insulating asbestos and glass wool. Compared with the prior art, the paint has the characteristics of simple preparation, sufficient strength at a high temperature, appropriate ventilation property, high collapsibility, etc.
Description
The invention belongs to the precision casting technology field, be specially adapted to cast the shell coating of the extraordinary foundry goods that thin-walled and thickness differ greatly.
The smart casting of no surplus is a new foundry engieering that grows up in modern technologies, is characterized in casting out very complicated parts of geometry.And except that assembly surface needed a small amount of processing, other surfaces externally and internallies all need not processed, the element precision height that casts out, and luminosity is good, has not only reduced labor content, and can save a large amount of precious metal materials.At present, in the production process of high temperature alloy precision castings, the main investment precision casting technology that adopts, promptly mix with refractory powder and do coating with silica sol binder or silicate hydrolyzate liquid, repeatedly repetition through wax-pattern stickness paint, extension sand, drying, until reaching the shell desired thickness, again through dewaxing, after the roasting, the production technology of vacuum metling alloy and cast article.
At present, binder making coating mainly adopts binding agent directly to mix stirring method with refractory powder.Employed binding agent mainly contains silicate hydrolyzate liquid and Ludox.
Silester coating has that surface quality is good, dry rapidly, high temperature and normal temperature strength greatly, not yielding, advantage such as the system shell cycle is short, but reaction need be hydrolyzed before its price height, the coating preparation, manufacturing process time length, complex process and coating holding time are short, as grasp bad, also often cause the shell inner surface " bloom " phenomenon to occur, casting quality is descended.
The characteristics of total silicon sol paint are that the shell surface quality is good, elevated temperature strength is big, indeformable, do not go out " bloom " and the coating preparation is simple, retention time is long, and can use repeatedly, and its price has only about 1/3rd of silester.The subject matter that exists is that environment is big to the influence of its degree of drying, the time long, efficient is lower, and is bad as drying control, can cause the shell inner surface to occur coming off when dewaxing.Adopt above-mentioned binding agent coating preparation method all can obtain the shell of better quality, but in the production of carrying out the thin-walled no-residual length leaf, then run into bigger problem; The blade that casts out crackle occurs at the thin-walled edge, causes foundry goods to scrap in a large number.
The objective of the invention is to propose a kind of produce the thin-section casting product have investment shell intensity height, good permeability, collapsibility performance is excellent and thin-section casting good product quality, the excellent coating of performance.
According to purpose requirement of the present invention, the thin-section casting that we proposed with the concrete component content (weight %) of coating is: binding agent 30~50%, refractory powder 40~60%, insulation material 5~15%.Binding agent is meant any one in silicon sol solution or the silicate hydrolyzate liquid in the component content of coating of the present invention; Refractory powder is meant casting zircon powder, any one in schmigel and the bauxite powder; Insulation material is meant any in the mixture that is incubated asbestos and insulation asbestos and glass staple, wherein being incubated the asbestos ratio is 85%~100%, the glass staple is 0~15%, mixes through fragmentation to add in the coating, and its insulation material total amount accounts for 5~15% of coating total amount.
The main preparation method of coating is the insulation material mixture after load weighted binding agent, refractory powder, activating agent and the fragmentation in proportion to be added in the agitator respectively stir, and makes insulation material and refractory powder fully wetting, and bubble is discharged.
Because insulation asbestos and heatproof glass staple at high temperature (the formwork back-up coat is below 1200 ℃) have good chemical stability, and in coating the shell process not with binding agent and refractory material generation chemical reaction, thereby can not influence the quality that coats of shell, in this process, the insulation asbestos with clagging in system shell surface, again through hanging sand, dry run and form insulation asbestos and binding agent, sand, the shell that refractory powder is formed, because insulation asbestos and heatproof glass staple good heat resistance, pyroconductivity is low and linear shrinkage is very little, the soft form of itself also helps forming the stress dispersion area of shell interlayer, thereby causes shell heating back overall wire shrinkage to change.
Because the adding of asbestos material in the system shell coating, formed thickness reaches the above insulation back-up coat of 3mm, shell its internal heat dissipating when roasting and casting slows down, alloy is slowly cooled off in casting mold, and the temperature difference between foundry goods thin-walled and the heavy wall is minimized, and freezing rate slows down, the casting solidification shrinkage stress obtains disperseing, alloy is in process of setting, and the stress that is subjected to when forming the sensitive temperature district by crackle will reduce, thereby the tendency that foundry goods is cracked diminishes.In addition, in the shell casting cycle, the casting initial stage is because shell is subjected to anxious thermal shock, often causes shell to produce from inside to outside rapid thermal expansion, a large amount of crackles occur and expands to skin at the shell internal layer.Because back-up coat has asbestos and the long staple of heatproof glass, when when crackle is expanded, running into the asbestos insulation material, the stress of its transmission will obtain discharging, thereby slow down and stop the continuation expansion of crackle effectively, the fiber reinforcement effect in its insulation material also can guarantee to have sufficient intensity under the shell high temperature.Therefore, under same casting condition, its cracking resistance line performance of shell that adds the asbestos insulation material is better than common shell.And, after back-up coat uses thermal insulation material, not only play the effect that stops crackle to be expanded from inside to outside, also make the shell internal layer form the segmentation crack of a large amount of noncontinuities, cause shell casting back bulk strength (retained strength) to descend, the shell collapsibility performance also is able to corresponding raising, sand removal work becomes and is easier to,, after outer shell peeled off, internal layer is very easily cleaning also.
Thin-section casting of the present invention with coating compared with prior art, made shell has that the preparation of good heat insulating, coating is simple, enough intensity, suitable breathable and good collapsibility are arranged under the high temperature, the thin-walled no-residual length leaf foundry goods that the shell that adopts this coating to prepare is produced, have foundry goods forming, surface smoothness height, casting yield significantly improves, and back-up coat shell bonding is good, and casting back cast cleaning is easy to characteristics.
Embodiment
The foundry goods example is selected smart casting thin-walled no-residual length leaf for use, and the blade key dimension is as follows: the thick 0.74mm of blade edge (exhaust limit), and the thick 6.1mm of blade, the long 59mm of blade, the thickest 15mm of blade root, cast alloys material are high-boron low-carbon high temperature alloy LK8 alloy; Table 1 is that the main component of embodiment of the invention coating and prior art coating compares, shell is made and is adopted silicate hydrolyzate liquid or silica sol binder respectively, refractory powder aluminium alumina, zircon and schmigel, prepare coating respectively in proportion, be incubated with non-thermal insulation coatings and coat shell, some on every group of shell combined blade foundry goods, alloy carry out the check of half-finished fluorescence of foundry goods and x-ray detection respectively after the vacuum melting casting.Assay sees Table 2.Table 2 is embodiment and the contrast of prior art end properties.
A, B, C, D, E, F, G, H, I, J are the composition and the finished product of coating of the present invention in table 1, table 2, and K, L are the composition coating and the yield rate of correlation technique.
Table 1 embodiment coating main component contrast (%)
Test group | Silester | Ludox | Schmigel | ZrO2 powder | The aluminium vanadine | Heat-preservation cotton | Remarks | |
Asbestos | Mineral wool | |||||||
A | 32.6 | / | / | / | 60.87 | 6.0 | 0.53 | 4 layers |
B | 31.25 | / | / | / | 58.33 | 9.17 | 1.25 | 4 layers |
C | / | 31.25 | / | / | 62.5 | 5.32 | 0.93 | 4 layers |
D | / | 30.0 | / | / | 60.0 | 8.5 | 1.5 | 4 layers |
E | / | 23.8 | 64.71 | / | / | 5.2 | 0.76 | 4 layers |
F | / | 23.07 | 62.27 | / | / | 8.58 | 0.85 | 4 layers |
G | / | 29.41 | / | 71.43 | / | 4.1 | 0.7 | 4 layers |
H | / | 28.30 | / | 69.23 | / | 7.0 | 0.7 | 4 layers |
I | / | 31.25 | / | / | 62.5 | 6.25 | / | 4 layers |
J | / | 30 | / | / | 60.0 | 10 | / | 4 layers |
K | 33.33 | / | / | / | 66.67 | / | / | 6 layers |
L | / | 35.0 | / | / | 65.0 | / | / | 6 layers |
The finished product contrast of table 2 embodiment thin-walled no-residual length leaf casting back
Test group | Sequence number | Binding agent | Heat-insulation layer | The casting finished product | Fluorescent inspection | X-ray detection | Certified products | Qualification rate |
A | 1 | Silester | Have | 18 | 14 | 13 | 13 | 68.4% |
2 | Silester | Have | 18 | 15 | 14 | 14 | 73.6% | |
B | 1 | Silester | Have | 19 | 16 | 15 | 15 | 78.9% |
2 | Silester | Have | 18 | 15 | 14 | 14 | 73.6% | |
C | 1 | Ludox | Have | 19 | 16 | 15 | 15 | 78.9% |
2 | Ludox | Have | 17 | 14 | 14 | 14 | 73.6% | |
D | 1 | Ludox | Have | 19 | 17 | 17 | 17 | 89.5% |
2 | Ludox | Have | 18 | 16 | 16 | 16 | 84.2% | |
E | 1 | Ludox | Have | 17 | 14 | 13 | 13 | 68.4% |
2 | Ludox | Have | 18 | 16 | 14 | 14 | 73.6% | |
F | 1 | Ludox | Have | 18 | 16 | 15 | 15 | 78.9% |
2 | Ludox | Have | 19 | 18 | 15 | 15 | 78.9% | |
G | 1 | Ludox | Have | 17 | 15 | 13 | 13 | 68.4% |
2 | Ludox | Have | 16 | 14 | 12 | 12 | 63.2% | |
H | 1 | Ludox | Have | 18 | 16 | 15 | 15 | 78.9% |
2 | Ludox | Have | 17 | 15 | 14 | 14 | 73.6% | |
I | 1 | Ludox | Have | 17 | 14 | 14 | 14 | 73.6% |
2 | Ludox | Have | 18 | 15 | 13 | 13 | 68.4% | |
J | 1 | Ludox | Have | 19 | 16 | 16 | 16 | 84.2% |
2 | Ludox | Have | 18 | 16 | 15 | 15 | 78.9% | |
K | 1 | Silester | Do not have | 4 | 2 | 2 | 2 | 10.5% |
2 | Silester | Do not have | 2 | 0 | 0 | 0 | 0 | |
L | 1 | Silester | Do not have | 3 | 2 | 0 | 0 | 0 |
2 | Silester | Do not have | 2 | 1 | 1 | 1 | 5 |
Claims (1)
1, a kind of coating for casting thin foundry goods, the concrete component content that it is characterized in that this coating is (weight %): bonding agent 30-50%, refractory powder 40-60%, insulation material 5-15%, wherein binding agent is meant in silicon sol solution or the silicate hydrolyzate liquid any one in the component content of coating of the present invention; Refractory powder is meant casting zircon powder, any one in schmigel and the bauxite powder; Insulation material is meant any in the mixture that is incubated asbestos and insulation asbestos and glass staple, and wherein being incubated the asbestos ratio is 85%~100%, and the glass staple is 0~15%, mixes through fragmentation to add in the coating.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN97116980A CN1049166C (en) | 1997-10-08 | 1997-10-08 | Coating for casting thin foundry goods |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN97116980A CN1049166C (en) | 1997-10-08 | 1997-10-08 | Coating for casting thin foundry goods |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1182655A CN1182655A (en) | 1998-05-27 |
CN1049166C true CN1049166C (en) | 2000-02-09 |
Family
ID=5174254
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN97116980A Expired - Fee Related CN1049166C (en) | 1997-10-08 | 1997-10-08 | Coating for casting thin foundry goods |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN1049166C (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103264141B (en) * | 2013-05-30 | 2015-04-01 | 苏州兴业材料科技股份有限公司 | Water-based casting zircon powder replacing coating and preparation method thereof |
CN103831394A (en) * | 2014-03-04 | 2014-06-04 | 王彦 | Enhanced rapidly-dried coating for investment casting and preparation method of enhanced rapid-drying coating |
CN104174814A (en) * | 2014-09-16 | 2014-12-03 | 沈阳飞机工业(集团)有限公司 | Ethyl silicate hydrolysate and preparation method and application thereof |
CN104942223A (en) * | 2015-07-30 | 2015-09-30 | 张燕 | Lost foam casting paint containing ferrovanadium residue and low tension ceramic waste material as well as preparation method of lost foam casting paint |
CN105033173A (en) * | 2015-09-23 | 2015-11-11 | 张燕 | Vanadium iron slag-corundum slag coating for lost foam casting and manufacturing method thereof |
CN105363999A (en) * | 2015-12-15 | 2016-03-02 | 常熟市虹桥铸钢有限公司 | Precise casting mold |
CN105694549B (en) * | 2016-03-15 | 2018-05-11 | 河南中帅金属制品有限公司 | A kind of dura mater casting fire-resistant anticorrosion paint based on asbestos and preparation method thereof |
CN106180541A (en) * | 2016-08-01 | 2016-12-07 | 安徽工程大学机电学院 | A kind of cast steel novel environment friendly coating |
CN107520405B (en) * | 2017-08-01 | 2019-07-16 | 安徽霍山科皖特种铸造有限责任公司 | A kind of high-performance investment casting shell |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4532096A (en) * | 1983-05-09 | 1985-07-30 | Bogner Ben R | Method of shaping articles using shaping surfaces having release agent coating |
US4867225A (en) * | 1988-03-23 | 1989-09-19 | Farley, Inc. | Coated expendable cores for die casting dies |
CN1082466A (en) * | 1993-02-15 | 1994-02-23 | 大连冷冻机厂 | Resin sand mould (core) or cast part type (core) is used water based paint |
CN1109678A (en) * | 1993-05-17 | 1995-10-04 | 胡坦斯·阿尔伯图斯化学厂有限公司 | Black wash for producing mould coatings |
-
1997
- 1997-10-08 CN CN97116980A patent/CN1049166C/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4532096A (en) * | 1983-05-09 | 1985-07-30 | Bogner Ben R | Method of shaping articles using shaping surfaces having release agent coating |
US4867225A (en) * | 1988-03-23 | 1989-09-19 | Farley, Inc. | Coated expendable cores for die casting dies |
CN1082466A (en) * | 1993-02-15 | 1994-02-23 | 大连冷冻机厂 | Resin sand mould (core) or cast part type (core) is used water based paint |
CN1109678A (en) * | 1993-05-17 | 1995-10-04 | 胡坦斯·阿尔伯图斯化学厂有限公司 | Black wash for producing mould coatings |
Also Published As
Publication number | Publication date |
---|---|
CN1182655A (en) | 1998-05-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4950627A (en) | Ceramic coating on metal | |
CN101502868B (en) | Centrifugal casting radiant tube paint and preparation method thereof | |
CN103949590B (en) | A kind of oxide doped and modified Y2O3The preparation method of+YSZ is high temperature resistant shell | |
CN105483440A (en) | Environment-friendly type preparation method for automobile engine blade | |
CN105537518A (en) | Preparation method of engine component | |
CN1049166C (en) | Coating for casting thin foundry goods | |
CN102284678A (en) | Method for preparing formwork of precisely-cast titanium alloy | |
WO2017114066A1 (en) | Environmentally friendly method for preparing automobile engine shell | |
CN105618679A (en) | Preparation method for automobile charging turbine | |
CN105506377A (en) | Environment-friendly type manufacturing method for car supercharging turbine | |
CN100455377C (en) | Casting titanium and titanium-aluminide alloy ceramic type backing layer paint and its preparation method | |
CN100560252C (en) | Tundish lining repairing method | |
US8137610B2 (en) | Molding compound for producing a fireproof lining | |
CN1243620C (en) | Preparing method of Gamma-TiAl base-alloy shuttering for investment casting | |
CZ20021689A3 (en) | Insulating refractory material | |
CN114178486B (en) | Shell for improving sand sticking on surface of high-temperature alloy after casting and preparation method thereof | |
CN104988342A (en) | Zirconium alloy melting and casting method | |
CN113070445B (en) | Large-caliber nodular cast iron pipe die coating and preparation method and application thereof | |
CN112500172B (en) | Application of glass composite material with high softening point, low thermal expansion coefficient, high wear resistance and low thermal conductivity in engine gas turbine | |
CN109277529A (en) | A kind of preparation method of model casting γ-TiAl-base alloy blade formwork | |
CN109702153B (en) | Improved process of wind power nodular cast iron hub pouring control method | |
CN111574209A (en) | Self-lubricating ceramic cutter with self-repairing capability and preparation method, repairing method and application thereof | |
CN115678323B (en) | Heat-insulating water-based paint and preparation and use methods thereof | |
CN107266064A (en) | MgAl2O4‑CaZrO3Composite shell, using and preparation method thereof | |
CN117779202A (en) | Polycrystalline powder for casting, casting surface layer material, preparation method of polycrystalline powder and casting surface layer material, and application of polycrystalline powder and casting surface layer material in fine casting shell process |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C06 | Publication | ||
PB01 | Publication | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |