CN105108054B - A kind of precision casting transition zone coating and its preparation method and application for shell processed - Google Patents
A kind of precision casting transition zone coating and its preparation method and application for shell processed Download PDFInfo
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- CN105108054B CN105108054B CN201510628729.8A CN201510628729A CN105108054B CN 105108054 B CN105108054 B CN 105108054B CN 201510628729 A CN201510628729 A CN 201510628729A CN 105108054 B CN105108054 B CN 105108054B
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Abstract
The present invention relates to a kind of precision casting shell processed transition zone coating and preparation method thereof, raw material by following weight part ratio forms: 10 parts of Ludox, zirconium English powder 16-20 part, defoamer 0.015-0.02 part, wetting agent 0.04-0.045 part, the flow cup viscosity number of described transition zone coating is 7-9s. The quality of investment shell of preparation is more stable, and the surface of shell is dense, and elevated temperature strength is good, and casting dimension accuracy is high, and product surface quality is good. Shelling property is good, fire resistance is good, and the thermal conductivity of shell is good, thermal expansivity is little, heat is shaken, and stability is excellent. Meanwhile, then by improving the addition of wetting agent and defoamer, ensured the good gas permeability of having of transition zone.
Description
Technical field
The invention belongs to precision casting technology field, be specifically related to a kind of precision casting shell processed transition zone coating and preparation method thereof.
Background technology
Product precision, complexity that precision-investment casting obtains, close to part final form, can not process or seldom just directly use of processing, is a kind of nearly clean advanced technologies that forms shape, is an excellent technology in casting industry, and its application is very extensive. It is not only applicable to the casting of all kinds, various alloys, and the casting dimension accuracy of producing, surface quality are higher than Castingother method, even Castingother method be difficult to cast complexity, high temperature resistant, the foundry goods that is not easy to processing, all can adopt precision-investment casting to cast.
In precision casting process, shell is to affect one of the most key factor of casting quality, and it is not only determining dimensional accuracy and the surface roughness of foundry goods, and directly affects manufacturing cost and the production efficiency of foundry goods. At present, the shell manufacture method that domestic precision castings extensively adopts in producing mainly contains following 3 kinds: sodium silicate shell, composite shell and silicasol case. Wherein, Ludox is applied to casting field as ceramic shell mo(u)ld binding agent, immediately with its unrivaled advantage progressively replaced widely used preparation technology once numerous and diverse, have pollution, waterglass and an ethyl silicate hydrolyzate that cost is high. Facts have proved to have following advantages as ceramic shell mo(u)ld stick by silica sol liquid: preparing process is easy, coating is convenient to storage, dip-coating is with continuing use after the slip adjusting component of crossing, reduce material consumption, dipping process stable performance, easily operation, ammonia while having cancelled with ethyl silicate hydrolyzate is dry, working environment improves, and adopts the heated-air drying of controlled humidity, and shell mould intensity is high, adopt water base Ludox, security is good. It is said, from silester is used Ludox instead, energy resource consumption reduces 20～30%, and shell mould qualification rate improves 15～20%, and working environment improves greatly.
In existing silicasol case preparation process, when the viscosity of transition zone slurry less (be coated with-4 and be less than 10s), the composite effect of defoamer or wetting agent and slurry is poor, cannot obtain desirable compatibility and surface smoothness, and when defoamer or wetting agent addition are when excessive, again corrosion is to a certain extent caused in wax part surface.
Summary of the invention
In order to overcome the problems referred to above, the invention provides a kind of precision casting shell processed transition zone coating and preparation method thereof, by wetting agent and defoamer and slurry additional proportion preferably, in improving the surface smoothness of the compatibility on transition zone slurry and wax part surface, product shell membrane, avoid defoamer or wetting agent to corrode wax part; Meanwhile, the linear contraction stability and the puncture resistance that in research, are also surprised to find product shell membrane have also obtained lifting to a certain degree.
For achieving the above object, the present invention adopts following technique:
A kind of precision casting shell processed transition zone coating, is made up of the raw material of following weight part ratio: 10 parts of Ludox, zirconium English powder 16-20 part, defoamer 0.015-0.02 part, wetting agent 0.04-0.045 part, now, the viscosity number of product is generally 7-9s. (viscosity described in the present invention is all painting-4 viscosity)
Preferably, described defoamer is organic siliconresin defoamer (called after GPE30 defoamer), and wherein, the mass percent of organic siliconresin is less than 10%. Described wetting agent forms (called after A-35 type wetting agent) by phosphoric acid, different monooctyl ester and oxireme mixed with polymers, wherein, and the conventional amount used that each component addition is this area.
The quality of investment shell that adopts above-mentioned transition zone coating to prepare is stable, surface compact, and casting dimension accuracy is high, and surface quality is good, has excellent elevated temperature strength, shelling property and fire resistance; Meanwhile, the shell stability advantages of higher that also has that thermal conductivity is good, thermal expansivity is little, heat is shaken.
In actual production, because the viscosity of transition zone slurry of the present invention is larger, while adopting conventional defoamer or wetting agent adding proportion, defoaming effect is poor, product surface is prone to folder beans (as shown in Figure 1), and the wetability of slurry promotes not quite simultaneously, cannot effectively reduce pulp surface energy, slurry be coated with weak effect, there is burr in product surface. In order to overcome the problems referred to above, the present invention has comprehensively analyzed the fusion mechanism of Ludox and zirconium English powder surface property, concentration and adhesive force interactively and the two and organic solvent, grope and verify through the experiment of thousands of times again, when discovery adopts the weight ratio of wetting agent and defoamer to be 8-9:3-4, can effectively improve the compatibility on transition zone slurry and wax part surface, improve the surface smoothness of product shell membrane, avoid defoamer or wetting agent to corrode wax part simultaneously.
In experiment, also find, for transition zone slurry of the present invention, in the time that the ratio of defoamer and wetting agent changes, particularly in the time that wetting agent ratio increases, can greatly improve slurry and compatibility wax part, when defoamer and the additional proportion of wetting agent while being 1:1, the burr on product shell membrane surface is grown thickly, as shown in Figure 1; In the time that the weight part ratio of the two is 1:2, burr phenomena makes moderate progress, but compatibility, surface smoothness and flatness are still difficult to reach requirement, as shown in Figure 2; By contrast experiment repeatedly, finally find that the product shell mould of acquisition not only has preferably compatibility, fineness and flatness in the time that the weight part ratio of defoamer and wetting agent is 3:8, and linear contraction stability and puncture resistance significantly strengthen; Continue to increase adding when being greater than 4:9 to the two mass ratio of wetting agent, corroding in various degree appears in wax part surface, for overcoming the problems referred to above, in the application, the mass ratio of defoamer and wetting agent is limited to 3:8-4:9.
Preferably, above-mentioned transition zone coating is made up of the raw material of following weight part ratio: 10 parts of Ludox, zirconium English powder 18-20 part, 0.015 part of GPE30 defoamer, 0.04 part of A-35 type wetting agent.
Our proportioning is 10 parts of Ludox at present, zirconium English powder 16-20 part, 0.04 part of wetting agent, 0.015 part of defoamer, this proportioning and traditional slurry compare, do not need binding agent, make operation more convenient, and there will not be the separation case of transition zone and backing layer, make its compatibility stronger, and we consider the granularity of backing layer sand and the thickness of shell mould, in order to allow its effective combination, improve shell mould intensity and permeability, comprehensive many experiments result is (higher by Zirconium English powder viscosity, associativity is poorer, if but too low, also poorer with the compatibility of backing layer) we draw this proportioning, the advantage of this proportioning is to make the fissility of transition zone and backing layer to improve, the robustness of shell mould and gas permeability improve simultaneously, drying time is short simultaneously, production efficiency is high, the attached associativity of parent improves, and greatly improve surface quality, particularly for low Co base, Ni base alloy has good effect, this class alloy is very high to the various parameter requests of shell mould, this technique improves the coefficient of expansion of its shell mould, gas permeability improves, reduce pore, the formation of pin hole, and ensure the intensity of shell mould, firm transition zone surface quality. this is also the advantage place of this invention.
With regard to transition zone coating of the present invention, in GPE30 defoamer, content of organics is higher, apt to deteriorate, particularly, in summer high-temperature situation, is difficult for preserving, and therefore its mass concentration is diluted to 0.12-0.15%. In multiple preferred versions of the present invention, in the time that A-35 type wetting agent mass concentration is greater than 0.4%, slurry fluidity declines, and produces undue thickness phenomenon. In the time that A-35 type wetting agent mass concentration is less than 0.36%, surface property and the permeability of slurry are bad, adhesive force declines. Confirm following result: make A-35 type wetting agent mass concentration respectively when the scope more than 0.36% and below 0.4%, can obtain good surface property, permeability and adhesive force.
Preferably, ZrO in described zirconium English powder2(HfO2) mass fraction be greater than 65%, Fe2O3Mass fraction be less than 0.1%, TiO2Mass fraction be less than 0.14%.
The present invention also provides the preparation method of a kind of precision casting shell processed transition zone coating, in Ludox, add successively A-35 type wetting agent, zirconium English powder, GPE30 defoamer, and mix, adjustment viscosity is 7-9s, continue to be stirred to after the time of technological requirement, to obtain final product.
Described A-35 type wetting agent and GPE30 defoamer be all purchased from Weifang Hua Zhong advanced composite material (ACM) Co., Ltd, No. 8, Venture Road, Nan Haozhen industry park, Changyue County of address Shandong Province. Item Number: AIB040A35, AIB06F79P.
Preferably, the concrete steps of described adjustment viscosity are: the viscosity of preliminary survey coating, if viscosity number is greater than 7-9s, adds Ludox adjustment; If viscosity number, lower than 7-9s, adds refractory powder adjustment.
Preferably, when described transition zone coating is all virgin material, mixing time >=24h, mixing time >=12h when transition zone coating part is virgin material.
Above-mentioned transition zone coating can be used for Hardware fitting, golf boats and ships, architectural hardware, mechanical fitting, aircraft manufacturing, weaponry, valve, the pump housing, or the manufacture of the precision casting such as the impeller on aircraft, train, naval vessel, blade, hollow blade.
Low Ni under the melting in air that Ni base and Co base alloy mainly refer to and low Co alloy (general content is below 50%), the molten steel of these alloys is had relatively high expectations to intensity and the coefficient of expansion on shell mould surface, and existing transition zone coating cannot meet above-mentioned technological requirement, this is also one of the present invention's reason that transition zone is improved, by above-mentioned research, transition zone coating of the present invention has better strengthened surperficial compatibility and the stability of shell mould, the any surface finish of alloy, dimensionally stable.
Therefore, the present invention also provides a kind of Ni base alloy precision foundry goods shell processed transition zone coating, raw material by following weight part ratio forms: 10 parts of Ludox, zirconium English powder 16-20 part, defoamer 0.015-0.02 part, wetting agent 0.04-0.045 part, being coated with 4-viscosity is 48-57s.
Preferably, described defoamer is GPE30 defoamer, and described wetting agent is A-35 type wetting agent.
A kind of Co base alloy precision foundry goods shell processed transition zone coating, is made up of the raw material of following weight part ratio: 10 parts of Ludox, zirconium English powder 16-20 part, defoamer 0.015-0.02 part, wetting agent 0.04-0.045 part, being coated with 4-viscosity is 48-57s.
Described defoamer is GPE30 defoamer, and described wetting agent is A-35 type wetting agent.
Beneficial effect of the present invention:
1., when transition zone coating of the present invention has improved the surface smoothness of compatibility, product shell membrane on transition zone slurry and wax part surface, avoided defoamer or wetting agent to corrode wax part; Linear contraction stability and the puncture resistance of product shell membrane have also obtained effective lifting.
2. the quality of investment shell that adopts transition zone coating of the present invention to prepare is stable, surface compact, and casting dimension accuracy is high, and surface quality is good, has excellent elevated temperature strength, shelling property and fire resistance; Meanwhile, the shell stability advantages of higher that also has that thermal conductivity is good, thermal expansivity is little, heat is shaken.
3., when transition zone coating of the present invention is for Ni base and Co base alloy, better strengthened surperficial compatibility and the stability of shell mould, any surface finish of alloy, dimensionally stable.
4. the quality of investment shell that adopts above-mentioned transition zone coating to prepare is stable, surface compact, and casting dimension accuracy is high, and surface quality is good, has excellent elevated temperature strength, shelling property and fire resistance; Meanwhile, the shell stability advantages of higher that also has that thermal conductivity is good, thermal expansivity is little, heat is shaken.
Brief description of the drawings
Fig. 1 product surface is prone to folder beans figure.
The aspect graph of product surface when the additional proportion of Fig. 2 GPE30 defoamer and A-35 type wetting agent is 1:2.
Fig. 3 defoamer reaction principle figure.
Concrete implementing measure
Below in conjunction with accompanying drawing, the present invention will be further elaborated. Should be noted that following explanation is only in order to explain the present invention, does not limit its content.
Embodiment 1
A kind of precision casting shell processed transition zone coating, is made up of the raw material of following weight part ratio: 10 parts of Ludox, 18 parts, zirconium English powder, 0.015 part of defoamer, 0.04 part of wetting agent.
Preparation method is as follows:
Apply transition zone on the shell membrane surface that applies surface layer, concrete steps are as follows:
The bad phenomenon such as room temperature 22-27 DEG C, in the time that temperature exceedes 27 DEG C, will cause shell mould to occur crackle, dry transition, will there will be iron wing, overlap, the shell that rises etc. bad in foundry goods.
Mixing time >=24h when transition zone coating is all virgin material, part virgin material mixing time >=12h;
Mixing time >=10h when transition zone coating and backing layer coating are all virgin material, part virgin material mixing time >=5h;
Virgin material is below 50%: mixing time 4-5h;
Virgin material is more than 50%: mixing time 6-12h;
Virgin material is more than 75%: mixing time 12-17h;
Virgin material 100%: mixing time 18-24h;
In proportion Ludox is poured in paint can (being stained with pulp grinder bucket).
Start and be stained with pulp grinder, make its rotation.
Ratio with per kilogram Ludox adds wetting agent, is mixed even.
In proportion refractory powder is slowly added in paint can, note preventing refractory powder caking, by stirring, powder is stirred out.
Ratio with per kilogram Ludox adds defoamer, is mixed even.
Coating be substantially mixed even after, with Zhan Shi cup preliminary survey dope viscosity. As too high in viscosity, add Ludox adjustment; As too low in viscosity, add refractory powder adjustment, the viscosity of the comparable requirement of first viscosimetric is slightly high, will slightly decline because coating stirs rear viscosity.
After dope viscosity is adjusted, continue to be stirred to after the time of technological requirement, reexamine dope viscosity, reach technological requirement and can use (viscosity is 7-9s).
Shell processed workshop should be prepared coating before leaving offices in proportion, is coated with slurry level and should reaches working stamndard requirement, and measure dope viscosity, adjusts proportion scale, until viscosity is qualified. After Hours paint can must continue to stir.
In actual production, the height of liquid level is limited, be in the 15cm of slurry bucket top edge, when liquid level is during lower than this height, carry out virgin material and supplement, to ensure the liquid level of slurry.
In operating process, the minimum altitude that we will control liquid level will reach cup bonding place, otherwise liquid level is too low, and shell mould will be shapeless, imperfect, and obscission also can occur cup.
When in use procedure, dope viscosity increases, available Ludox is adjusted.
When transition zone coating, charging sequence be to strictly press, Ludox, wetting agent, zirconium English powder, defoamer added successively,
Charging sequence should be correct.
With the angle of about 45-60 degree, module is slowly immersed to transition zone and be coated with in slip and slightly rotate, the air that attention wraps in coating wax-pattern groove and sharp corner minimizes, while having typefounding or thin narrow groove with hairbrush brushing or spray paint in advance; Take out module with fast speed slightly, unnecessary painting gob is removed, blow bale broken with compressed air and be attached to the bubble in wax-pattern hole and wedge angle, ceaselessly rotate module, on module, form complete uniform coating; The module that is covered with uniform coating is stretched into drench in sand machine and overturn, allow all surfaces uniform fold last layer sand, wait for that the transition zone of natural drying rear shell is to form, follow-uply can make back-up coat by the preparation method identical with transition zone shell. The preparation method of described surface layer is also identical with transition zone, the materials of surface layer and back-up coat, follow-up bake, casting process can carry out routine according to the state of the art and select.
Preparation product can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness is high, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting.
Embodiment 2
A kind of precision casting shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 20 parts, zirconium English powder, 0.015 part of defoamer, 0.04 part of wetting agent the raw material of following weight part ratio.
Preparation method is with embodiment 1.
Preparation product can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness is high, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting.
Embodiment 3
A kind of precision casting shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 16 parts, zirconium English powder, 0.015 part of defoamer, 0.04 part of wetting agent the raw material of following weight part ratio.
Preparation method is with embodiment 1.
Preparation product can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness is high, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting.
Embodiment 4
A kind of precision casting shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 18 parts, zirconium English powder, 0.015 part of defoamer, 0.04 part of wetting agent the raw material of following weight part ratio. The mass concentration of GPE30 defoamer is 0.12%, and the mass concentration of wetting agent is 0.36%.
Preparation method is with embodiment 1.
Preparation product can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness is high, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting.
Embodiment 5
A kind of precision casting shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 20 parts, zirconium English powder, 0.015 part of GPE30 defoamer, 0.04 part of A-35 type wetting agent the raw material of following weight part ratio.
Preparation method is with embodiment 1.
The product of preparation can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness promotes 1-2 grade compared with dimethicone defoamer or n-octyl alcohol defoamer, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting.
Embodiment 6
A kind of precision casting shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 16 parts, zirconium English powder, 0.015 part of GPE30 defoamer, 0.04 part of A-35 type wetting agent the raw material of following weight part ratio.
Preparation method is with embodiment 1.
The product of preparation can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness promotes 1-2 grade compared with dodecyl sodium sulfate or AEO wetting agent, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting.
Embodiment 7
A kind of precision casting shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 18 parts, zirconium English powder, 0.015 part of GPE30 defoamer, 0.04 part of A-35 type wetting agent the raw material of following weight part ratio. The mass concentration of GPE30 defoamer is 0.12%, and the mass concentration of wetting agent is 0.36%.
Preparation method is with embodiment 1.
Preparation product can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness is high, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting.
The arbitrary described scheme of embodiment 1-7 is prepared Hardware fitting, golf boats and ships, architectural hardware mechanical fitting, aircraft manufacturing weaponry, valve, the pump housing that transition zone is manufactured, or the product quality of the precision casting such as the impeller on aircraft, train, naval vessel, blade, hollow blade all reaches the target level of product quality of hot investment casting.
Embodiment 8
A kind of Ni base alloy precision foundry goods shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 20 parts, zirconium English powder, 0.015 part of defoamer, 0.04 part of wetting agent the raw material of following weight part ratio. The mass concentration of defoamer is 0.132%, and the mass concentration of wetting agent is 0.38%.
Preparation method is with embodiment 1.
Preparation product can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness is high, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting. Properties of product are obviously better than general non-Co base alloy precision foundry goods.
Embodiment 9
A kind of Co base alloy precision foundry goods shell processed transition zone coating, is characterized in that, is made up of: 10 parts of Ludox, 16 parts, zirconium English powder, 0.015 part of GPE30 defoamer, 0.04 part of A-35 type wetting agent the raw material of following weight part ratio. The mass concentration of GPE30 defoamer is 0.5%, and the mass concentration of wetting agent is 0.4%.
Preparation method is with embodiment 1.
Preparation product can avoid occurring shrinkage cavity or shrinkage defect, surface smoothness is high, the linear contraction stability of product shell membrane and puncture resistance excellence, product quality can reach the target level of product quality of hot investment casting. Properties of product are obviously better than general non-Ni base alloy precision foundry goods.
The precision casting that described in embodiment 1-9 prepared by transition zone coating can meet the corresponding industry standard-required of various product, and described standard comprises: JB/T7946.1-1999; JB/T4153-1999; JB/T4007-1999; JB/T2980.2-1999; JB/T2980.1-1999; GB/T14235.9-1993; GB/T14235.8-1993; GB/T14235.7-1993; GB/T14235.6-1993; GB/T14235.5-1993; GB/T14235.4-1993; GB/T14235.3-1993; GB/T14235.2-1993; GB/T14235.1-1993; GB/T12215-1990; GB/T12214-1990.
Comparative example 1;
Be with the difference of embodiment 1, the weight part ratio of defoamer and wetting agent is 1:1. Product surface fineness is poor, occur shrinkage cavity or shrinkage defect, and product quality cannot reach the target level of product quality of hot investment casting.
Comparative example 2
Be with the difference of embodiment 1, the weight part ratio of defoamer and wetting agent is 3:4. Product surface fineness is poor, shrinkage cavity and porosity and burr, and product quality cannot reach the target level of product quality of hot investment casting.
Comparative example 3
Be with the difference of embodiment 1, the weight part ratio of defoamer and wetting agent is 1:2. Product surface fineness is poor, occur shrinkage cavity and porosity and burr, and product quality cannot reach the target level of product quality of hot investment casting.
Comparative example 4
Be with the difference of embodiment 1, the weight part ratio of defoamer and wetting agent is 4:10. Product surface fineness is poor, occur shrinkage cavity or shrinkage defect, and product quality cannot reach the target level of product quality of hot investment casting.
Comparative example 5
Be with the difference of embodiment 1, the mass concentration of A-35 type wetting agent is 0.42%. The undue thickness of slurry, seriously causes slurry to be scrapped. Product surface fineness is poor, and product quality cannot reach the target level of product quality of hot investment casting.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. a precision casting shell processed transition zone coating, is characterized in that, by the raw material group of following weight part ratioBecome: 10 parts of Ludox, zirconium English powder 16-20 part, defoamer 0.015-0.02 part, wetting agent 0.04-0.045Part, being coated with 4-viscosity is 7-9s.
2. coating as claimed in claim 1, is characterized in that, described defoamer is GPE30 defoamer, instituteStating wetting agent is A-35 type wetting agent;
Described GPE30 defoamer is organic siliconresin defoamer, and called after GPE30 defoamer is wherein, organicThe mass percent of silicones is less than 10%;
Described A-35 type wetting agent is formed by phosphoric acid, different monooctyl ester and oxireme mixed with polymers, called after A-35Type wetting agent.
3. the preparation method of transition zone coating for the shell processed of the precision casting described in claim 1-2 any one, its spyLevy and be, in Ludox, add successively wetting agent, zirconium English powder, defoamer, and mix, adjust viscosityFor 7-9s, continue to be stirred to after the time of technological requirement, to obtain final product.
4. method as claimed in claim 3, is characterized in that, the concrete steps of described adjustment viscosity are: justThe viscosity of surveying coating, if viscosity number is greater than 7-9s, adds Ludox adjustment; If viscosity number is lower than 7-9s,Add refractory powder adjustment.
5. method as claimed in claim 3, is characterized in that, when described transition zone coating is all virgin material,Mixing time >=24h, mixing time >=12h when transition zone coating part is virgin material.
6. the arbitrary described transition zone coating of claim 1-2 is preparing in boats and ships, mechanical fitting, aircraft manufacturingApplication.
7. the shell processed of the precision casting described in claim 1-2 any one is being manufactured Ni base alloy with transition zone coatingApplication in precision casting.
8. the shell processed of the precision casting described in claim 1-2 any one is being manufactured Co base alloy with transition zone coatingApplication in precision casting.
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| CN108838324A (en) * | 2018-08-21 | 2018-11-20 | 安徽信息工程学院 | Medium temperature wax silica-sol wash and preparation method thereof |
| CN108746485A (en) * | 2018-08-21 | 2018-11-06 | 安徽信息工程学院 | Medium temperature wax silica-sol wash and preparation method thereof |
| CN108746484A (en) * | 2018-08-21 | 2018-11-06 | 安徽信息工程学院 | Medium temperature wax silica-sol wash and preparation method thereof |
| CN112296250A (en) * | 2020-10-12 | 2021-02-02 | 山东燕山精密机械有限公司 | Preparation process of shell-making slurry for precision casting shell |
| CN112453313B (en) * | 2020-11-13 | 2022-04-26 | 中国航发沈阳黎明航空发动机有限责任公司 | Preparation method of shell material of high-temperature alloy case investment casting |
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| CN101480707A (en) * | 2008-01-09 | 2009-07-15 | 南车资阳机车有限公司 | Metal casting method |
| CN101362184A (en) * | 2008-09-08 | 2009-02-11 | 莱芜市泰钢新材料有限责任公司 | Manufacture method of stainless steel, carbon steel precision casting surface shell |
| CN103600030A (en) * | 2013-08-30 | 2014-02-26 | 泰州枫叶冶金设备有限公司 | Preparation method of heat-resisting alloy sliding-block shell by investment casting |
| CN104190861A (en) * | 2014-09-15 | 2014-12-10 | 内蒙古第一机械集团有限公司 | Investment precoat for making shell in investment casting |
| CN104722703A (en) * | 2015-04-03 | 2015-06-24 | 莱芜市泰钢新材料有限责任公司 | Production method of precision casting surface layer sizing agent |
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