CN107243594A - A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof - Google Patents
A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof Download PDFInfo
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- CN107243594A CN107243594A CN201710448361.6A CN201710448361A CN107243594A CN 107243594 A CN107243594 A CN 107243594A CN 201710448361 A CN201710448361 A CN 201710448361A CN 107243594 A CN107243594 A CN 107243594A
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Abstract
The invention discloses a kind of used in aluminium alloy casting insulating refractory coating, include the raw material of following parts by weight：35 45 parts of mineral powder mixture, silanization banket 10 20 parts of powder, 35 parts of carborundum, 24 parts of silicon nitride, 13 parts of boron nitride, 26 parts of sodium carboxymethylcellulose, 68 parts of compound whisker, 9 13 parts of powdered graphite, 7 11 parts of hydrogenated wood rosin glycerol ester, 80 100 parts of solvent.The insulating refractory coating of the present invention possesses preferable viscosity, good high-temperature resistant property and elevated temperature strength, can reduce the tendency of aluminium alloy castings stomata and micro-crack, and the coating of coating is easy to peel off from cast(ing) surface, and subsequent treatment is simple, saves substantial amounts of artificial；The raw material components of the present invention are safe and reliable simultaneously and raw material is easy to get, and cost is relatively low, and technique is concise, it is easy to industrialized production is operated and realize, with higher practical value and good application prospect.
Description
Technical field
The present invention relates to aluminium alloy casting technology field, and in particular to a kind of used in aluminium alloy casting insulating refractory coating and its
Preparation method.
Background technology
As structural material, compared with steel, aluminium alloy has density small, the advantages of specific strength is high, Aeronautics and Astronautics,
The field such as automobile, medicine equipment consumption increasingly increases.In aluminium alloy castings production process, especially with porose aluminium alloy
In casting manufacturing process, substantial amounts of hole defect can be produced near pore structure, aluminium alloy castings performance especially mechanical property is caused
It can be declined to a great extent with sealing property, cause yield rate low, mass energy is wasted, and to production brings loss.For in aluminium alloy
Hole defect research already turn into casting aluminum alloy study hotspot, but never effectively process with
Control or eliminate such hole defect.
On the other hand the advantage for making binding agent using syrup is that metal mold is easily cleared up when reusing.Have the disadvantage syrup
The temperature of metal mold there are certain requirements when being made, and used of grain, mold temperature too prepared paint is not applied, apply
Moisture in material is not volatile, easily causes gas hole defect；Mold temperature is too high, and syrup is easily burnt up, and coating is lost bonding
Performance, molten metal easily washes out dope layer during cast, and protective effect is lost to metal mold, cast(ing) surface many is easily occurred
Tiny pin hole, can also produce the phenomenon that metal mold and casting molten metal adhere to each other, casting is caused when serious sometimes
With scrapping for casting mold.The advantage of waterglass coating is that dry strength is big, and metal mold temperature undergoes no deterioration burn-up when high.Have the disadvantage to make
It is difficult with rear cleaning.Paint thickness can not apply thickness, be only capable of reaching 0.3-0.5mm, otherwise easy to crack to peel off, therefore casting mold uses the longevity
Life is shorter.Polyvinyl alcohol coating advantage is that dry strength is big, can with a variety of high temperature resistant filler mixed preparings, paint thickness can thicken to
2-5mm, carbonization bright film can be produced under molten metal high temperature action, makes cast(ing) surface bright and clean.Have the disadvantage to be blended the time long, spray
To be continuously agitated during painting, to prevent coating layering and precipitating, the more difficult control of coating layer thickness is uniform.
In the prior art, in the low-pressure casting of aluminium alloy, for metal mold cavity and the coating of cast instrument surface spraying, state
Interior traditional product mainly uses the pulvis such as zinc oxide, whiting, graphite powder for raw material, is added water glass and water by different proportion
Live modulation is carried out, agitated uniform rear spraying is used.It was verified that the open defect of the technology has：1. reconcile and prepare coating
Troublesome poeration, expends the time, and 2. raw material cost is high, influences product benefit；3. due to traditional raw material poor thermal insulation property, therefore use
When need frequent heating cavity and spraying, and easily cause the viscous burning of die cavity；4. the surface quality of continuous castings produced is not good enough.
The content of the invention
, should it is an object of the invention to provide a kind of heat-insulated protective coating of aluminum alloy doors and windows for the defect of prior art
The thermal conductivity of heat-insulated protective coating is low, good heat-insulation effect, decay resistance are strong, and its chemical property is stable, case hardness is preferable, resistance to
Friction, coating application is convenient, one-shot forming；The raw material components of the present invention are safe and reliable simultaneously, harmless, and raw material is easy
, cost is relatively low, and technique is concise, it is easy to industrialized production is operated and realize, with higher practical value and good application
Prospect.
The present invention solves technical problem and adopted the following technical scheme that：
The invention provides a kind of used in aluminium alloy casting insulating refractory coating, include the raw material of following parts by weight：
35-45 parts of mineral powder mixture, silanization banket 10-20 parts of powder, 3-5 parts of carborundum, 2-4 parts of silicon nitride, boron nitride
1-3 parts, it is 2-6 parts of sodium carboxymethylcellulose, 6-8 parts of compound whisker, 9-13 parts of powdered graphite, 7-11 parts of hydrogenated wood rosin glycerol ester, molten
80-100 parts of agent.
Preferably, the used in aluminium alloy casting insulating refractory coating includes the raw material of following parts by weight：
40 parts of mineral powder mixture, silanization banket 15 parts of powder, 4 parts of carborundum, 3 parts of silicon nitride, 2 parts of boron nitride, carboxymethyl
4 parts of sodium cellulosate, 7 parts of compound whisker, 11 parts of powdered graphite, 9 parts of hydrogenated wood rosin glycerol ester, 90 parts of solvent.
Preferably, the mineral powder mixture is mullite powder, talcum powder, silica flour, sepiolite powder, compares 2 according to weight:1:
2:3:The mixture of 1 composition.
Preferably, the silanization bankets powder for attapulgite, diatomite, bentonite, according to weight ratio after silanization
5:1:The mixture of 1 composition.
Preferably, the compound whisker is that titanium dioxide crystal whisker, potassium titanate crystal whisker compare 3 according to weight:The mixing of 1 composition
Thing.
Preferably, the solvent is that ethanol, n-octyl alcohol, polyvinyl alcohol compare 6 according to weight:1:The mixture of 2 compositions.
The present invention also provides a kind of preparation method of used in aluminium alloy casting insulating refractory coating, comprises the following steps：
Step one, weigh on request and prepare each component raw material；
Step 2, by silanization banket powder, sodium carboxymethylcellulose, compound whisker mix add mixer in, stir 25-
35 minutes, speed of agitator 250-350r/min obtained mixture A；
Step 3, mineral powder mixture, processing aid, carborundum, silicon nitride, boron nitride, powdered graphite mixed solvent are added
Ball milling 2-4 hours in wet ball mill, in the case where temperature is 55-65 DEG C, constant temperature is stirred 35-45 minutes, and mixture B is made；
Step 4, high-speed stirred is added by mixture B made from mixture A made from step 2, hydrogenated wood rosin glycerol ester and step 3
In machine, rotating speed is 1000-1200r/min, and 35-45 DEG C is stirred 15-25 minutes, and the used in aluminium alloy casting insulating refractory of invention is made
Coating.
Preferably, the preparation process of the used in aluminium alloy casting insulating refractory coating is：
Step one, weigh on request and prepare each component raw material；
Step 2, by silanization banket powder, sodium carboxymethylcellulose, compound whisker mix add mixer in, stirring 30
Minute, speed of agitator 300r/min obtains mixture A；
Step 3, mineral powder mixture, processing aid, carborundum, silicon nitride, boron nitride, powdered graphite mixed solvent are added
Ball milling 3 hours in wet ball mill, in the case where temperature is 60 DEG C, constant temperature is stirred 40 minutes, and mixture B is made；
Step 4, high-speed stirred is added by mixture B made from mixture A made from step 2, hydrogenated wood rosin glycerol ester and step 3
In machine, rotating speed is 1100r/min, and 40 DEG C are stirred 20 minutes, and the used in aluminium alloy casting insulating refractory coating of invention is made.
Preferably, the specific silanization treatment step of the attapulgite, diatomite, bentonite is：1）By attapulgite, silicon
Diatomaceous earth, bentonite and silicone oil are 1 in mass ratio:3 are scattered in alcohol solvent；2）Stirring 2-4 is small at 45-55 DEG C of bath temperature
When, then it is evaporated at 90-95 DEG C of bath temperature；3）It is transferred in Muffle furnace and is calcined, ground 200 mesh sieve is produced.
Compared with prior art, the present invention has following beneficial effect：
（1）The present invention a kind of used in aluminium alloy casting insulating refractory coating use mineral powder mixture be mainly mullite powder,
Talcum powder, silica flour, sepiolite powder, want refractory aggregate based on these mineral powder mixtures, make low-voltage cast aluminum part any surface finish, no knot
Scar, it is no adhesion etc. defect, in addition add silica flour after, further increase the combination property of coating.
（2）The powdered graphite of a kind of used in aluminium alloy casting insulating refractory coating addition of the present invention, it is possible to increase coating
Thermal shock resistance, carborundum, silicon nitride, the boron nitride material of addition can improve the heat-resisting quantity and good flow graph performance of coating.
（3）A kind of silanization powder that bankets of used in aluminium alloy casting insulating refractory coating addition of the present invention is mainly bumps
Rod soil, diatomite, bentonite, these banket after silanization so that coating has good high-temperature resistant property and high temperature strong
Degree, while reducing the thermal conductivity of coating, can improve the binding strength and tight ness rating of coating and molding sand, reduce coating at high temperature
Interior porosity.
（4）A kind of used in aluminium alloy casting insulating refractory coating of the present invention possesses preferable viscosity, good high temperature cracking resistance
Property and elevated temperature strength, the tendency of aluminium alloy castings stomata and micro-crack can be reduced, the coating of coating is easy to peel off from cast(ing) surface,
Subsequent treatment is simple, saves substantial amounts of artificial；The raw material components of the present invention are safe and reliable simultaneously and raw material is easy to get, and cost is relatively low,
Technique is concise, it is easy to industrialized production is operated and realize, with higher practical value and good application prospect.
Embodiment
With reference to specific embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, shown
So, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the reality in the present invention
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made all belongs to
In the scope of protection of the invention.
Embodiment 1.
A kind of used in aluminium alloy casting insulating refractory coating of the present embodiment, includes the raw material of following parts by weight：
35 parts of mineral powder mixture, silanization banket 10 parts of powder, 3 parts of carborundum, 2 parts of silicon nitride, 1 part of boron nitride, carboxymethyl
2 parts of sodium cellulosate, 6 parts of compound whisker, 9 parts of powdered graphite, 7 parts of hydrogenated wood rosin glycerol ester, 80 parts of solvent.
Mineral powder mixture in the present embodiment is mullite powder, talcum powder, silica flour, sepiolite powder, compares 2 according to weight:
1:2:3:The mixture of 1 composition.
Silanization in the present embodiment bankets powder for attapulgite, diatomite, bentonite, according to weight ratio after silanization
5:1:The mixture of 1 composition.
Compound whisker in the present embodiment is titanium dioxide crystal whisker, potassium titanate crystal whisker compares 3 according to weight:1 composition it is mixed
Compound.
Solvent in the present embodiment is ethanol, n-octyl alcohol, polyvinyl alcohol compare 6 according to weight:1:The mixture of 2 compositions.
A kind of preparation method of used in aluminium alloy casting insulating refractory coating of the present embodiment, comprises the following steps：
Step one, weigh on request and prepare each component raw material；
Step 2, by silanization banket powder, sodium carboxymethylcellulose, compound whisker mix add mixer in, stirring 25
Minute, speed of agitator 250r/min obtains mixture A；
Step 3, mineral powder mixture, processing aid, carborundum, silicon nitride, boron nitride, powdered graphite mixed solvent are added
Ball milling 2 hours in wet ball mill, in the case where temperature is 55 DEG C, constant temperature is stirred 35 minutes, and mixture B is made；
Step 4, high-speed stirred is added by mixture B made from mixture A made from step 2, hydrogenated wood rosin glycerol ester and step 3
In machine, rotating speed is 1000r/min, and 35 DEG C are stirred 15 minutes, and the used in aluminium alloy casting insulating refractory coating of invention is made.
The specific silanization treatment step of attapulgite, diatomite, bentonite in the present embodiment is：1）By attapulgite,
Diatomite, bentonite and silicone oil are 1 in mass ratio:3 are scattered in alcohol solvent；2）Stirred 4 hours at 55 DEG C of bath temperature,
Then it is evaporated at 95 DEG C of bath temperature；3）It is transferred in Muffle furnace and is calcined, ground 200 mesh sieve is produced.
Embodiment 2.
A kind of used in aluminium alloy casting insulating refractory coating of the present embodiment, includes the raw material of following parts by weight：
45 parts of mineral powder mixture, silanization banket 20 parts of powder, 5 parts of carborundum, 4 parts of silicon nitride, 3 parts of boron nitride, carboxymethyl
6 parts of sodium cellulosate, 8 parts of compound whisker, 13 parts of powdered graphite, 11 parts of hydrogenated wood rosin glycerol ester, 100 parts of solvent.
Mineral powder mixture in the present embodiment is mullite powder, talcum powder, silica flour, sepiolite powder, compares 2 according to weight:
1:2:3:The mixture of 1 composition.
Silanization in the present embodiment bankets powder for attapulgite, diatomite, bentonite, according to weight ratio after silanization
5:1:The mixture of 1 composition.
Compound whisker in the present embodiment is titanium dioxide crystal whisker, potassium titanate crystal whisker compares 3 according to weight:1 composition it is mixed
Compound.
Solvent in the present embodiment is ethanol, n-octyl alcohol, polyvinyl alcohol compare 6 according to weight:1:The mixture of 2 compositions.
A kind of preparation method of used in aluminium alloy casting insulating refractory coating of the present embodiment, comprises the following steps：
Step one, weigh on request and prepare each component raw material；
Step 2, by silanization banket powder, sodium carboxymethylcellulose, compound whisker mix add mixer in, stirring 35
Minute, speed of agitator 350r/min obtains mixture A；
Step 3, mineral powder mixture, processing aid, carborundum, silicon nitride, boron nitride, powdered graphite mixed solvent are added
Ball milling 4 hours in wet ball mill, in the case where temperature is 65 DEG C, constant temperature is stirred 45 minutes, and mixture B is made；
Step 4, high-speed stirred is added by mixture B made from mixture A made from step 2, hydrogenated wood rosin glycerol ester and step 3
In machine, rotating speed is 1200r/min, and 45 DEG C are stirred 25 minutes, and the used in aluminium alloy casting insulating refractory coating of invention is made.
The specific silanization treatment step of attapulgite, diatomite, bentonite in the present embodiment is：1）By attapulgite,
Diatomite, bentonite and silicone oil are 1 in mass ratio:3 are scattered in alcohol solvent；2）Stirred 2 hours at 45 DEG C of bath temperature,
Then it is evaporated at 90 DEG C of bath temperature；3）It is transferred in Muffle furnace and is calcined, ground 200 mesh sieve is produced.
Embodiment 3.
A kind of used in aluminium alloy casting insulating refractory coating of the present embodiment, includes the raw material of following parts by weight：
40 parts of mineral powder mixture, silanization banket 15 parts of powder, 4 parts of carborundum, 3 parts of silicon nitride, 2 parts of boron nitride, carboxymethyl
4 parts of sodium cellulosate, 7 parts of compound whisker, 11 parts of powdered graphite, 9 parts of hydrogenated wood rosin glycerol ester, 90 parts of solvent.
Mineral powder mixture in the present embodiment is mullite powder, talcum powder, silica flour, sepiolite powder, compares 2 according to weight:
1:2:3:The mixture of 1 composition.
Silanization in the present embodiment bankets powder for attapulgite, diatomite, bentonite, according to weight ratio after silanization
5:1:The mixture of 1 composition.
Compound whisker in the present embodiment is titanium dioxide crystal whisker, potassium titanate crystal whisker compares 3 according to weight:1 composition it is mixed
Compound.
Solvent in the present embodiment is ethanol, n-octyl alcohol, polyvinyl alcohol compare 6 according to weight:1:The mixture of 2 compositions.
A kind of preparation method of used in aluminium alloy casting insulating refractory coating of the present embodiment, comprises the following steps：
Step one, weigh on request and prepare each component raw material；
Step 2, by silanization banket powder, sodium carboxymethylcellulose, compound whisker mix add mixer in, stirring 30
Minute, speed of agitator 300r/min obtains mixture A；
Step 3, mineral powder mixture, processing aid, carborundum, silicon nitride, boron nitride, powdered graphite mixed solvent are added
Ball milling 3 hours in wet ball mill, in the case where temperature is 60 DEG C, constant temperature is stirred 40 minutes, and mixture B is made；
Step 4, high-speed stirred is added by mixture B made from mixture A made from step 2, hydrogenated wood rosin glycerol ester and step 3
In machine, rotating speed is 1100r/min, and 40 DEG C are stirred 20 minutes, and the used in aluminium alloy casting insulating refractory coating of invention is made.
The specific silanization treatment step of attapulgite, diatomite, bentonite in the present embodiment is：1）By attapulgite,
Diatomite, bentonite and silicone oil are 1 in mass ratio:3 are scattered in alcohol solvent；2）Stirred 3 hours at 50 DEG C of bath temperature,
Then it is evaporated at 93 DEG C of bath temperature；3）It is transferred in Muffle furnace and is calcined, ground 200 mesh sieve is produced.
The present invention a kind of used in aluminium alloy casting insulating refractory coating possess preferable viscosity, good high-temperature resistant property and
Elevated temperature strength, can reduce the tendency of aluminium alloy castings stomata and micro-crack, and the coating of coating is easy to peel off from cast(ing) surface, subsequently
Processing is simple, saves substantial amounts of artificial；The raw material components of the present invention are safe and reliable simultaneously and raw material is easy to get, and cost is relatively low, technique
It is concise, it is easy to industrialized production to be operated and realize, with higher practical value and good application prospect.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It may be appreciated other embodiment.
Claims (9)
1. a kind of used in aluminium alloy casting insulating refractory coating, it is characterised in that include the raw material of following parts by weight：
35-45 parts of mineral powder mixture, silanization banket 10-20 parts of powder, 3-5 parts of carborundum, 2-4 parts of silicon nitride, boron nitride
1-3 parts, it is 2-6 parts of sodium carboxymethylcellulose, 6-8 parts of compound whisker, 9-13 parts of powdered graphite, 7-11 parts of hydrogenated wood rosin glycerol ester, molten
80-100 parts of agent.
2. a kind of used in aluminium alloy casting insulating refractory coating according to claim 1, it is characterised in that the aluminium alloy casting
Make includes the raw material of following parts by weight with insulating refractory coating：
40 parts of mineral powder mixture, silanization banket 15 parts of powder, 4 parts of carborundum, 3 parts of silicon nitride, 2 parts of boron nitride, carboxymethyl
4 parts of sodium cellulosate, 7 parts of compound whisker, 11 parts of powdered graphite, 9 parts of hydrogenated wood rosin glycerol ester, 90 parts of solvent.
3. a kind of used in aluminium alloy casting insulating refractory coating according to claim 1 or 2, it is characterised in that the mineral
Powder mixture is mullite powder, talcum powder, silica flour, sepiolite powder, compares 2 according to weight:1:2:3:The mixture of 1 composition.
4. a kind of used in aluminium alloy casting insulating refractory coating according to claim 1 or 2, it is characterised in that the silane
Change bankets powder for attapulgite, diatomite, bentonite, compares 5 according to weight after silanization:1:The mixture of 1 composition.
5. a kind of used in aluminium alloy casting insulating refractory coating according to claim 1 or 2, it is characterised in that the chemical combination
Thing whisker is titanium dioxide crystal whisker, potassium titanate crystal whisker compares 3 according to weight:The mixture of 1 composition.
6. a kind of used in aluminium alloy casting insulating refractory coating according to claim 1 or 2, it is characterised in that the solvent
Compare 6 according to weight for ethanol, n-octyl alcohol, polyvinyl alcohol:1:The mixture of 2 compositions.
7. a kind of method for preparing used in aluminium alloy casting insulating refractory coating as claimed in claim 1 or 2, it is characterised in that
Comprise the following steps：
Step one, weigh on request and prepare each component raw material；
Step 2, by silanization banket powder, sodium carboxymethylcellulose, compound whisker mix add mixer in, stir 25-
35 minutes, speed of agitator 250-350r/min obtained mixture A；
Step 3, mineral powder mixture, processing aid, carborundum, silicon nitride, boron nitride, powdered graphite mixed solvent are added
Ball milling 2-4 hours in wet ball mill, in the case where temperature is 55-65 DEG C, constant temperature is stirred 35-45 minutes, and mixture B is made；
Step 4, high-speed stirred is added by mixture B made from mixture A made from step 2, hydrogenated wood rosin glycerol ester and step 3
In machine, rotating speed is 1000-1200r/min, and 35-45 DEG C is stirred 15-25 minutes, and the used in aluminium alloy casting insulating refractory of invention is made
Coating.
8. a kind of preparation method of used in aluminium alloy casting insulating refractory coating according to claim 7, it is characterised in that institute
Stating step is：
Step one, weigh on request and prepare each component raw material；
Step 2, by silanization banket powder, sodium carboxymethylcellulose, compound whisker mix add mixer in, stirring 30
Minute, speed of agitator 300r/min obtains mixture A；
Step 3, mineral powder mixture, processing aid, carborundum, silicon nitride, boron nitride, powdered graphite mixed solvent are added
Ball milling 3 hours in wet ball mill, in the case where temperature is 60 DEG C, constant temperature is stirred 40 minutes, and mixture B is made；
Step 4, high-speed stirred is added by mixture B made from mixture A made from step 2, hydrogenated wood rosin glycerol ester and step 3
In machine, rotating speed is 1100r/min, and 40 DEG C are stirred 20 minutes, and the used in aluminium alloy casting insulating refractory coating of invention is made.
9. a kind of preparation method of used in aluminium alloy casting insulating refractory coating according to claim 7, it is characterised in that institute
Stating the specific silanization treatment step of attapulgite, diatomite, bentonite is：1）By attapulgite, diatomite, bentonite and silicone oil
It is 1 in mass ratio:3 are scattered in alcohol solvent；2）Stirred 2-4 hours at 45-55 DEG C of bath temperature, then in bath temperature
It is evaporated at 90-95 DEG C；3）It is transferred in Muffle furnace and is calcined, ground 200 mesh sieve is produced.
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| CN108249938A (en) * | 2018-03-29 | 2018-07-06 | 合肥聪亨新型建材科技有限公司 | A kind of model casting liner refractory composite and preparation method thereof |
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| CN108927489A (en) * | 2018-08-16 | 2018-12-04 | 界首市天龙消防器材有限责任公司 | A kind of improved method promoting lost foam casting precision |
| CN108927489B (en) * | 2018-08-16 | 2020-08-11 | 界首市天龙消防器材有限责任公司 | Improved method for improving lost foam casting manufacturing precision |
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