CN106270371A - Magnesium alloy sand mold casts with from hard fire-retardant transfer coatings and preparation method thereof - Google Patents
Magnesium alloy sand mold casts with from hard fire-retardant transfer coatings and preparation method thereof Download PDFInfo
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- CN106270371A CN106270371A CN201610756325.1A CN201610756325A CN106270371A CN 106270371 A CN106270371 A CN 106270371A CN 201610756325 A CN201610756325 A CN 201610756325A CN 106270371 A CN106270371 A CN 106270371A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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Abstract
The present invention relates to a kind of magnesium alloy sand mold cast with from hard fire-retardant transfer coatings and preparation method thereof, the described each component including following mass fraction from hard fire-retardant transfer coatings: heat-resisting aggregate 30～50 parts；Suspending agent 0.5～2.5 parts；Binding agent 1～5 parts；Coupling agent 0.2～0.8 part；Fire retardant 0.5～2.5 parts；Defoamer 0.1～1.5 parts；Preservative 0.01～0.03 part；Water 50～70 parts.Coating prepared by the present invention has preferable adhesiveness, coating and flame retardant effect, is difficult to precipitation during use.The most easy to crack at casting process floating coat, surface quality of continuous castings is good, and dimensional accuracy is high, it is adaptable to magnesium alloy cast technical field.
Description
Technical field
The present invention relates to casting technology field, particularly relate to the casting of a kind of magnesium alloy sand mold with from hard fire-retardant transfer coatings and
Its preparation method.
Background technology
Magnesium alloy is metal material the lightest in actual application, have that density is little, specific strength specific stiffness high, damping good,
The performance characteristics such as electromagnetic shielding capability is strong and is easily recycled.Being described as " 21st century green metal material ", each industry is flourishing
Country pay much attention to magnesium alloy research and development, and magnesium alloy has been widely used in defence and military, Aero-Space, automobile and
The fields such as electronics and information industry.Along with the raising of energy-conserving and environment-protective standard in recent years, magnesium-alloy material year worldwide increases
Long rate is more than 20%.
It is known that magnesium chemical property is active, liquid magnesium easily occurs anti-with the water in the oxygen in air, nitrogen and casting mold
Should.The consistency of the skins covering of the surface such as the oxide of reaction result generation and nitride reduces, and heat conductivity is deteriorated, and causes reaction to be released greatly
Calorimetric amount can not distribute rapidly, causes the temperature in reaction interface to raise rapidly, exacerbates the oxidizing fire of magnesium, makes magnesium close
There is cavity and oxide skin in gold cast(ing) surface, and time serious, foundry goods is scrapped.Therefore prevent in casting process magnesium alloy in casting mold
Burning is one of key technology improving Mg alloy castings surface quality.During magnesium alloy cast, interpolation is typically taked to adopt
With rare earth element (CN 200510043198.2, CN 201310433255.2) and the calcium (CN of low quality mark
201310297159.X) in magnesium alloy fused mass, make the protective oxide film that magnesium alloy fused mass Surface Creation is fine and close, thus stop
The alloying approach of magnesium alloy burning.But in casting process, magnesium alloy fused mass can react with mold material and reduce magnesium
Alloy flame retardant effect.Take in casting mold, add fire retardant for above-mentioned situation and react problem to solve magnesium alloy with casting mold, in
State's Patent document number is CN 201310562214.3, and patent name is " a kind of laser sintered precoated sand being applicable to magnesium alloy
Material and preparation method thereof ", the ablation of generation, oxidation when reducing magnesium alloy pouring by adding composite flame-retardant agent in molding sand
The defects such as skin.But, owing in casting process, mold material and liquid magnesium alloy, by dope layer mediate contact, cause to casting mold
Middle addition fire retardant can not reach significant flame retardant effect.
Liquid magnesium alloy directly contacts with dope layer, owing to the chemical property of magnesium is active, and can be with the fire-resistant bone in many coating
There is chemical reaction in material, so the coating of conventional cast steel, cast iron and aluminium alloy has to pass through improvement and could be used for magnesium alloy.Mesh
Before generally take in coating add fire retardant to arrive flame retardant effect.Through finding prior art literature retrieval, China is specially
Profit CN 200510060833.8 discloses a kind of magnesium alloy coating and preparation method thereof, this coatings chemistry composition be zinc oxide 9～
13%, graphite powder 3～7%, boric acid 5～9%, waterglass 3～5%, remaining is pure water.Through facts have proved the zinc oxide system of using
The paint coatings intensity obtained is relatively low, poor durability.Meanwhile, under high temperature action, Silica hydrogel dehydration ftracture, make waterglass coating with
Casting mold adhesive strength reduces, and causes paint adhesion to be deteriorated.Chinese patent literature number is CN200710058077.4, patent name
For " preparation method for magnesium alloy cast paint ", take to add boride in coating to reach fire-retardant effect, but this technique mistake
Journey dispensing, preparation procedure are complicated, and manufacturing cost is the most higher.Chinese patent CN 101391281A discloses a kind of magnesium alloy gold
Genotype low-pressure casting coatings, the heat-resisting aggregate that this coating selection does not reacts with liquid magnesium alloy, select sodium hexameta phosphate as bonding
Agent, and in coating, add boride as fire retardant.Although it was verified that coating prepared by this technology does not occur anti-with magnesium liquid
Should, but other performances of coating are undesirable.Further, foregoing invention patent may be only available for the permanent mold casting of simple shape,
It is directed to complicated magnesium alloy sand mold foundry goods and there is limitation.On the other hand, in sand casting process, make in type (core) and afterwards will
Paint brush, spray or be dipped in its surface, owing to coating is to apply under the conditions of unconfined, brush can be there is on the surface of type (core)
Trace, trickle, the coating surface defect such as accumulation, and thickness of coating layer directly affects foundry goods the most complicated tiny casting dimension essence
Degree.Therefore, current magnesium alloy sand mold fireproof cast coating development has become one of critical bottleneck of its application of restriction.
Coating transfer method is that coating is coated in model or box surface, then filling moulding or coremaking by one in advance, from
And dope layer is transferred to the novel casting coating technology of sand mold or whose surfaces, use coating transfer method to solve
The problems referred to above.Coating transfer techniques is the box surface that coating is applied directly to heating the earliest, is then filled with coated sand
Solidification, but powder-type coating and the core shape that can manufacture owing to using all is restricted, so being difficult to promote.The most universal
Using with water-based graphite coating (" casting ", Yuan Shoumin, nineteen ninety volume 39 o. 11th, P20～24), waterglass is binding agent
Water based paint (CN 102825211 A, CN 104801659 A), the self-hard coating (CN of hydrated glass
201510179389.5, " heat processing technique ", Zhou Qiyu etc., the 3rd phase of volume 23 in 1994, P39～41), phosphate is coated with from hard
Expect (CN 1065612A, " Journal of Liaoning Institute of Technology ", the wide source of cattle etc., the 2nd phase of volume 18 in 1998, P37～44), achieve painting
Expect completely to shift, but owing to above-mentioned coating exists easily pollution, gas forming amount height, production cost height, technological process length and easily inhales
The shortcoming such as wet.Meanwhile, above-mentioned transfer coatings is substantially coated on precoated sand and waterglass sand mold, and the existence of above-mentioned sand mold is got angry
Amount is big, and flame retardant effect is poor and the shortcoming such as the easy moisture absorption.Therefore, above-mentioned transfer coatings and sand mold are not all suitable for magnesium alloy cast mistake
Journey.
In sum, the exploitation of current magnesium alloy sand mold foundry facing is a urgent need to solve the problem, and it is the most former
Because being a lack of corresponding special coating.Therefore exploitation magnesium alloy sand mold casts with having highly important from hard fire-retardant transfer coatings
Meaning.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide a kind of magnesium alloy sand mold casting with from the most fire-retardant
Transfer coatings and preparation method thereof, can solve existing to prepare the problem that coating used for magnesium alloy can react with casting mold, again can
Obtain transfer coated intensity higher, and being firmly combined with between sand mold, drying and casting process is not occurring the bright and clean of cracking
Mo(U)ld face.
It is an object of the invention to be achieved through the following technical solutions:
The invention provides a kind of magnesium alloy sand mold to cast with from hard fire-retardant transfer coatings, described from hard fire-retardant transfer coatings
Each component including following mass fraction:
Preferably, the granularity of described heat-resisting aggregate is 200～320 mesh, and described heat-resisting aggregate includes schmigel, magnesium oxide
One or more mixture in powder, Pulvis Talci or graphite powder.Described heat-resisting aggregate size is excessive, and breathability can be caused to become
Difference, adhesion is difficult to greatly the demoulding；Undersized good permeability, but surface finish of casting can be caused to be deteriorated.
Preferably, in described heat-resisting aggregate, the mass content of schmigel is 22.5-50%, the mass content of magnesia powder
For 22.5-40%.
Preferably, described suspending agent is one or more in sodio rectorite powder, sodium bentonite and attapulgite
Mixture.
Preferably, the weight ratio of described heat-resisting aggregate and suspending agent is 40:1.
Preferably, described binding agent is in urea-formaldehyde-modified furane resins, water soluble phenol resin, water soluble alkyd resin
One or more mixture.
Preferably, described coupling agent is silane coupler KH～550, and density is 0.94g/cm3。
Preferably, one or more mixture during described fire retardant includes boric acid, ammonium fluoroborate, sulfur.
Preferably, described fire retardant includes each component of following weight/mass percentage composition: boric acid 45～85%, ammonium fluoroborate 4
~
20%, sulfur 10～40%.Described boric acid content is too high, applying coating can be caused to reduce and breathability is deteriorated；
Ammonium fluoroborate too high levels can cause the coating moisture absorption, and crack resistance intensity reduces；Sulfur content is too high, can make coating
Send out
Tolerance increases.
Preferably, the granularity of described boric acid is 100～300 mesh.
Preferably, described ammonium fluoroborate granularity is 100～300 mesh.
Preferably, described sulfur granularity is 100～300 mesh.
Preferably, one or more during described defoamer includes organic silicon defoamer, n-butyl alcohol, n-amyl alcohol, n-octyl alcohol
Mixture.
Preferably, one or more mixing during described preservative includes industrial formaldehyde solution, penta sodium pentachlorophenate, pentachloro-naphthols
Thing.
Preferably, described carrier fluid is water.
Present invention also offers a kind of magnesium alloy sand mold to cast by the preparation method from hard fire-retardant transfer coatings, including following
Step:
S1, weigh each raw material components according to weight/mass percentage composition；
S2, suspending agent is mixed 5～10 parts of water-powered rollers mill, add defoamer and preservative continues to mill, make A liquid；
S3, fire retardant is mixed 5～10 parts of water grind, make B liquid；
S4, the water of refractory aggregate with coupling agent, binding agent and 5～10 parts is mixed after grind, make C liquid；
S5, mixing A, B, C liquid, continue to grind after adding the water of surplus, obtains the casting of described magnesium alloy sand mold with from hard resistance
Combustion transfer coatings.
Preferably, described grinding equipment includes colloid mill or ball mill.
Described magnesium alloy sand mold casts with as follows from the using method of hard fire-retardant transfer coatings:
1, first use the method for spraying that (releasing agent is included XY-LTM2, XY-1, XY-TM2, KRTM-02A, KRTM-04A
In one) be coated in die surface, spray-on coating thickness is 0.1～0.2mm, coating rate 100%, silicon powder of then jetting,
Thickness is 0.1～0.2mm, and coating rate is 100%, is then blown off by unnecessary silicon powder, and releasing agent has coated.Use spray again
The method being coated with mould surface spraying one layer 0.05～0.3mm thick from hard fire-retardant transfer coatings, coating coating process should be 2
Complete in minute, prepare filling moulding.
2, after sprayed coating terminates, after the molding sand aggregate weighed and fire retardant are blended 1～3min, it is sequentially added into solidification
Continue after agent, silane coupler, resinoid bond to be blended 1～3min, obtain self-hardening resin sand mold sand.By above-mentioned self-hardening resin sand
Insert in the mould of spraying remover, after vibration ramming, mould is put into evacuation 2 hours in Dewar vessel, treats that coating hardens
Rear molding or taking-up core, at this moment complete coating transfer on (core) surface from die surface to sand mold, prepare fine and close, bright and clean
Sand mold (core), so surface accurate can be obtained further, foundry goods that dimensional accuracy is high.
Preferably, in step 2, molding sand aggregate is the quartz sand of granularity 50～100 mesh, and in quartz, silica weight contains
Amount is more than 96%.
Preferably, the quality of resinoid bond described in step 2 is the 1～2.5% of quartz sand quality
Preferably, fire retardant described in step 2 includes that mass fraction is boric acid 45～85%, ammonium fluoroborate 4～20%, sulfur
Sulphur 10～40%.
Preferably, the quality of described fire retardant is the 0.5～2% of quartz sand quality.
Preferably, the quality of firming agent described in step 2 is the 30～60% of resinoid bond quality.
Preferably, the quality of silane coupler described in step 2 is the 20～70% of resinoid bond quality.
The magnesium alloy sand mold casting that the present invention provides is coated with existing transfer with from the chemical composition of hard fire-retardant transfer coatings
Material has bigger difference, and the main distinction is as follows: do not add waterglass or phosphate in (1) coating as binding agent；(2) it is
Improve coating transfer effect, the ratio of the refractory aggregate in coating and suspending agent is adjusted, described heat-resisting aggregate and
The weight ratio of suspending agent is 40:1, in order to when coating has preferably adhesive strength, anti-flammability, suspension, coating and hardening
Between；(3) for prevent magnesium alloy and the heat-resisting aggregate in coating from reacting, coating adds boron compound and sulphur compound.
The magnesium alloy sand mold casting that the present invention provides has significant advantage with from hard fire-retardant transfer coatings, with traditional casting
Steel, cast iron are compared with aluminium alloy coating, and the present invention uses schmigel and magnesia powder as main heat-resisting aggregate, improves coating
Refractoriness, the addition of magnesia powder reduces the reaction between magnesium molten metal and heat-resisting aggregate.The addition of suspending agent in this coating
Being intended to improve the suspension of coating, compared with traditional Ludox suspending agent, coating is difficult to precipitation, maintains good uniformity
And dispersibility, showing through putting into practice detection, 72 hours suspensions of coating are more than 95%.This coating adds borate family fire-retardant
Agent, in use, borate family and sulfur powder body in coating are filled in heat-resisting aggregate and can increase coating consistency.
Boric acid, under high temperature action, generates boric anhydride (B2O3), boric anhydride contacts with liquid magnesium alloy surface and generates fine and close Mg3B2Protecting film,
Boric anhydride reacts generation MgO B with the MgO of liquid surface simultaneously2O5Protecting film prevents liquid magnesium alloy from aoxidizing combustion in casting process
Burn.Sulfur powder body contacts one layer of finer and close MgS oxide-film of generation and stops aluminium alloy oxidation reaction with magnesium alloy liquid level.This coating
The binding agent that middle addition can interact with resin bonded sand mould, and the additional proportion of binding agent is adjusted, it is simple to control to be coated with
The setting rate of the bed of material, does not haves the layering decortication phenomenon that dope layer and resin bonded sand mould cause due to setting rate difference,
Thus reach to harden with resin bonded sand mould simultaneously.With traditional containing waterglass and phosphoric acid salt adhesive coated compared with, dope layer
It is difficult to the moisture absorption.
Prior art is compared, and the present invention has a following beneficial effect:
1, it is mainly used in magnesium alloy sand mold casting technology field from hard fire-retardant transfer coatings, compared with common coating, there is conjunction
Suitable suspension, adhesiveness, coating and flame retardant effect, is difficult to precipitation during use.Coating prepared by the present invention and sand mold
Having preferable bond strength and elevated temperature strength, the easy demoulding, the coating rate of transform is more than 98%.
2, coating of the present invention is not in addition to reacting with magnesium alloy, the most easy to crack in casting process coating, cast(ing) surface light
The defects such as clean, nothing scabs, non-scale, dimensional accuracy is high, it is adaptable to magnesium alloy cast technical field.
3, the preparation method for coating of the present invention is simple, molding cycle is short, low cost, through the short time spray after get final product back-up sand
Moulding, convenient popularization.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in the technology of this area
Personnel are further appreciated by the present invention, but limit the present invention the most in any form.It should be pointed out that, the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement.These broadly fall into the present invention
Protection domain.
Following embodiment provides a kind of magnesium alloy sand mold and casts with from hard fire-retardant transfer coatings, described from hard fire-retardant transfer
Coating includes each component of following mass fraction:
The granularity of described heat-resisting aggregate is 200～320 mesh, and described heat-resisting aggregate includes schmigel, magnesia powder, Talcum
One or more mixture in powder or graphite powder.
In described heat-resisting aggregate, the mass content of schmigel is 22.5-50%, and the mass content of magnesia powder is 22.5-
40%.
Described suspending agent is one or more mixture in sodio rectorite powder, sodium bentonite and attapulgite.
Described binding agent be urea-formaldehyde-modified furane resins, water soluble phenol resin, water soluble alkyd resin and in one
Plant or several mixture.
Described coupling agent is silane coupler KH～550, and density is 0.94g/cm3。
Described fire retardant includes one or more mixture in boric acid, ammonium fluoroborate, sulfur.
Described fire retardant includes each component of following weight/mass percentage composition: boric acid 45～85%, ammonium fluoroborate 4～20%,
Sulfur 10～40%.Described boric acid content is too high, applying coating can be caused to reduce and breathability is deteriorated；Ammonium fluoroborate content mistake
Height can cause the coating moisture absorption, and crack resistance intensity reduces；Sulfur content is too high, and the amount of gas evolution from the coating can be made to increase.
The granularity of described boric acid is 100～300 mesh.
Described ammonium fluoroborate granularity is 100～300 mesh.
Described sulfur granularity is 100～300 mesh.
Described defoamer includes one or more mixture in organic silicon defoamer, n-butyl alcohol, n-amyl alcohol, n-octyl alcohol.
Described preservative includes one or more mixture in industrial formaldehyde solution, penta sodium pentachlorophenate, pentachloro-naphthols.
Described carrier fluid is water.
Following embodiment additionally provides a kind of magnesium alloy sand mold casting preparation method from hard fire-retardant transfer coatings, including
Following steps:
S1, weigh each raw material components according to weight/mass percentage composition；
S2, suspending agent is mixed 5～10 parts of water-powered rollers mill, add defoamer and preservative continues to mill, make A liquid；
S3, fire retardant is mixed 5～10 parts of water grind, make B liquid；
S4, the water of refractory aggregate with coupling agent, binding agent and 5～10 parts is mixed after grind, make C liquid；
S5, mixing A, B, C liquid, continue to grind after adding the water of surplus, obtains the casting of described magnesium alloy sand mold with from hard resistance
Combustion transfer coatings.
Described grinding equipment includes colloid mill or ball mill.
Embodiment 1
Present embodiments provide a kind of magnesium alloy sand mold to cast by the preparation method from hard fire-retardant transfer coatings, including following
Step:
Raw material:
The refractory aggregate using following proportioning is schmigel 25 parts, magnesia powder 20 parts, graphite powder 5 parts；Suspending agent is sodium
Base bentonite 1 part, attapulgite 0.25 part；Urea-formaldehyde-modified furane resins binding agent 2 parts；Coupling agent 0.5 part；Fire retardant 0.5 part
(including boric acid 75wt%, ammonium fluoroborate 6wt%, sulfur 19wt%)；Organic silicon defoamer 0.3 part；Penta sodium pentachlorophenate preservative
0.01 part；50 parts of water.
Preparation method:
1, the suspending agent weighed is mixed after 5～10 parts of water mill 0.5 hour in colloid mill or ball mill, in liquid
Add defoamer and preservative continues to mill 1 hour, make A liquid, the solution prepared is loaded in hermetic container standby.
2, after being milled 1 hour in colloid mill or ball mill by the fire proofing weighed, 5～10 parts of water are mixed at colloid mill
Or continue in ball mill to grind 1 hour, make B liquid.The solution prepared is loaded in hermetic container standby.
3, after being milled 1.5 hours in colloid mill or ball mill by the refractory aggregate weighed, it is separately added into coupling agent, bonding
The water of agent and 5～10 parts continues to grind 1 hour in colloid mill or ball mill, makes C liquid.The solution prepared is loaded airtight appearance
In device standby.
4, mixing A, B, C liquid, continues after adding the water of surplus to continue to grind 1 hour in colloid mill or ball mill, will join
Good solution loads in hermetic container standby, obtains described magnesium alloy sand mold and casts with from hard fire-retardant transfer coatings.
Using method:
When 1, using, first use the method for spraying that KRTM-02A releasing agent is coated in die surface, spray-on coating thickness
Being 0.1～0.2mm, coating rate 100%, silicon powder of then jetting, thickness is 0.1～0.2mm, and coating rate is 100%, then will
Unnecessary silicon powder blows off, and releasing agent has coated.Use the method for spraying mould surface spraying one layer 0.05～0.3mm again
Thick from hard fire-retardant transfer coatings, coating coating process should complete in 2 minutes, prepares filling moulding.
2, after in step 1, sprayed coating terminates, then the molding sand aggregate 95% weighed and fire retardant 1.2% are blended 1～
After 3min, after being sequentially added into firming agent 0.4%, coupling agent 50%, binding agent 1.2%, continue to be blended 1～3min, i.e. derive from hard tree
Fat sand mold sand.Above-mentioned self-hardening resin sand is inserted in the mould of spraying remover, after vibration ramming, mould is put into Dewar vessel
Middle evacuation 2 hours, molding or taking-up core after coating hardens.Use gravity casting and pouring Mg alloy castings, liquid magnesium alloy
Pouring temperature is up to 760 DEG C, and the foundry goods of cast is carried out detection discovery, and when this coating prevents cast, magnesium alloy is in casting mold
Burning, it is thus achieved that any surface finish, the Mg alloy castings of non-oxidation elephant skin.
Embodiment 2
Present embodiments provide a kind of magnesium alloy sand mold to cast by the preparation method from hard fire-retardant transfer coatings, including following
Step:
Raw material:
The refractory aggregate using following proportioning is schmigel 15 parts, magnesia powder 15 parts, graphite powder 10 parts；Suspending agent is sodium
Base bentonite 1 part；Urea-formaldehyde-modified furane resins binding agent 5 parts；Coupling agent 0.8 part；Fire retardant 1.5 parts (include boric acid 75wt%,
Ammonium fluoroborate 6wt%, sulfur 19wt%)；Organic silicon defoamer 1.5 parts；Penta sodium pentachlorophenate preservative 0.03 part；70 parts of water.
Preparation method:
1, the suspending agent weighed is mixed after 5～10 parts of water mill 0.5 hour in colloid mill or ball mill, in liquid
Add defoamer and preservative continues to mill 1 hour, make A liquid, the solution prepared is loaded in hermetic container standby.
2, after the fire proofing weighed being milled 1 hour in colloid mill or ball mill, mix 15 parts of water at colloid mill or
Continue in ball mill to grind 1 hour, make B liquid.The solution prepared is loaded in hermetic container standby.
3, after being milled 1 hour in colloid mill or ball mill by the refractory aggregate weighed, it is separately added into coupling agent, binding agent
Water with 15 parts continues to grind 1 hour in colloid mill or ball mill, makes C liquid.The solution prepared is loaded in hermetic container
Standby.
4, mixing A, B, C liquid, continues after adding the water of surplus to continue to grind 1 hour in colloid mill or ball mill, will join
Good solution loads in hermetic container standby, obtains described magnesium alloy sand mold and casts with from hard fire-retardant transfer coatings.
Using method:
When 1, using, first using the method for spraying that XY-LTM2 releasing agent is coated in die surface, spray-on coating thickness is
0.1～0.2mm, coating rate 100%, silicon powder of then jetting, thickness is 0.1～0.2mm, and coating rate is 100%, then will be many
Remaining silicon powder blows off, and releasing agent has coated.The method using spraying again is thick mould surface spraying one layer 0.05～0.3mm
From hard fire-retardant transfer coatings, coating coating process should complete in 2 minutes, prepares filling moulding.
2, after in step 1, sprayed coating terminates, then the molding sand aggregate 95% weighed and fire retardant 1.5% are blended 1～
After 3min, after being sequentially added into firming agent 0.5%, coupling agent 50%, binding agent 1.5%, continue to be blended 1～3min, i.e. derive from hard tree
Fat sand mold sand.Above-mentioned self-hardening resin sand is inserted in the mould of spraying remover, after vibration ramming, mould is put into Dewar vessel
Middle evacuation 2 hours, molding or taking-up core after coating hardens.Use gravity casting and pouring Mg alloy castings, liquid magnesium alloy
Pouring temperature is up to 760 DEG C, and the foundry goods of cast is carried out detection discovery, and when this coating prevents cast, magnesium alloy is in casting mold
Burning, it is thus achieved that any surface finish, the Mg alloy castings of non-oxidation elephant skin.
Embodiment 3
Present embodiments provide a kind of magnesium alloy sand mold to cast by the preparation method from hard fire-retardant transfer coatings, including following
Step:
Raw material:
The refractory aggregate using following proportioning is schmigel 10, magnesia powder 10 parts, Pulvis Talci 5, graphite powder 5 parts；Suspend
Agent is sodio rectorite 0.25 part, attapulgite 0.5 part；Water soluble phenol resin binding agent 1 part；Coupling agent 0.2 part；Fire retardant
2.5 parts (including boric acid 75wt%, ammonium fluoroborate 10%, sulfur 15wt%)；Organic silicon defoamer 0.1 part；Penta sodium pentachlorophenate anticorrosion
Agent 0.01 part；60 parts of water.
Preparation method:
1, the suspending agent weighed is mixed after 5～10 parts of water mill 0.5 hour in colloid mill or ball mill, in liquid
Add defoamer and preservative continues to mill 1 hour, make A liquid, the solution prepared is loaded in hermetic container standby.
2, after being milled 1 hour in colloid mill or ball mill by the fire proofing weighed, 5～10 parts of water are mixed at colloid mill
Or continue in ball mill to grind 1 hour, make B liquid.The solution prepared is loaded in hermetic container standby.
3, after being milled 1.5 hours in colloid mill or ball mill by the refractory aggregate weighed, it is separately added into coupling agent, bonding
The water of agent and 5～10 parts continues to grind 1 hour in colloid mill or ball mill, makes C liquid.The solution prepared is loaded airtight appearance
In device standby.
4, mixing A, B, C liquid, continues after adding the water of surplus to continue to grind 1 hour in colloid mill or ball mill, will join
Good solution loads in hermetic container standby, obtains described magnesium alloy sand mold and casts with from hard fire-retardant transfer coatings.
Using method:
When 1, using, first using the method for spraying that XY-1 releasing agent is coated in die surface, spray-on coating thickness is 0.1
～0.2mm, coating rate 100%, silicon powder of then jetting, thickness is 0.1～0.2mm, and coating rate is 100%, then by unnecessary
Silicon powder blow off, releasing agent has coated.Use the method for spraying in mould surface spraying one layer 0.05～0.3mm thickness again
From hard fire-retardant transfer coatings, coating coating process should complete in 2 minutes, prepares filling moulding.
2, after in step 1, sprayed coating terminates, then the molding sand aggregate 95% weighed and fire retardant 1.2% are blended 1～
After 3min, after being sequentially added into firming agent 0.4%, coupling agent 50%, binding agent 1.2%, continue to be blended 1～3min, i.e. derive from hard tree
Fat sand mold sand.Above-mentioned self-hardening resin sand is inserted in the mould of spraying remover, after vibration ramming, mould is put into Dewar vessel
Middle evacuation 2 hours, molding or taking-up core after coating hardens.Use gravity casting and pouring Mg alloy castings, liquid magnesium alloy
Pouring temperature is up to 760 DEG C, and the foundry goods of cast is carried out detection discovery, and when this coating prevents cast, magnesium alloy is in casting mold
Burning, it is thus achieved that any surface finish, the Mg alloy castings of non-oxidation elephant skin.
Comparative example 1
This comparative example 1 relates to the casting of a kind of magnesium alloy sand mold with from the preparation method of hard fire-retardant transfer coatings and user
Method, its composition and each constituent mass number differ only in embodiment 1: this comparative example does not contains fire retardant.
Described preparation method and the same embodiment of using method.
Using gravity casting and pouring Mg alloy castings, liquid magnesium alloy pouring temperature is up to 760 DEG C, carries out the foundry goods of cast
Detection finds, cast(ing) surface exists the oxide skin of Discrete Distribution and is mingled with, and coating flame retardant effect is poor.
Comparative example 2
Comparative example 2 relates to the casting of a kind of magnesium alloy sand mold with from the preparation method of hard fire-retardant transfer coatings and using method,
Differing only in of its composition and each constituent mass number and embodiment 2: urea-formaldehyde-modified furane resins binding agent 0.5 part.
Described preparation method and the same embodiment of using method.
Finding after molding or taking-up core after coating hardening, the dope layer rate of transform is poor, there is localized delamination and elephant skin are existing
As, dope layer poor adhesive force, intensity reduces.
Comparative example 3
This comparative example 3 relates to the casting of a kind of magnesium alloy sand mold with from the preparation method of hard fire-retardant transfer coatings and user
Method, its composition and each constituent mass number differ only in embodiment 3: without magnesia powder in this comparative example, schmigel
Content is 20 parts.
Described preparation method and the same embodiment of using method.
Using gravity casting and pouring Mg alloy castings, liquid magnesium alloy pouring temperature is up to 760 DEG C, carries out the foundry goods of cast
Detection finds, cast(ing) surface local distribution the defect such as scab and sand holes, the fire-resistant difference of coating.
Comparative example 4
This comparative example 4 relates to the casting of a kind of magnesium alloy sand mold with from the preparation method of hard fire-retardant transfer coatings and user
Method, its composition and each constituent mass number differ only in embodiment 3: without schmigel in this comparative example, magnesia powder
Content is 20 parts.
Described preparation method and the same embodiment of using method.
Using gravity casting and pouring Mg alloy castings, liquid magnesium alloy pouring temperature is up to 760 DEG C, carries out the foundry goods of cast
Detection finds, cast(ing) surface local distribution the defect such as scab and sand holes, the fire-resistant difference of coating.
Comparative example 5
This comparative example 5 relates to the casting of a kind of magnesium alloy sand mold with from the preparation method of hard fire-retardant transfer coatings and user
Differing only in of method, its composition and each constituent mass number and embodiment 3: in this comparative example fire retardant be boric acid 60wt%,
Sulfur 40wt%.
Described preparation method and the same embodiment of using method.
Using gravity casting and pouring Mg alloy castings, liquid magnesium alloy pouring temperature is up to 760 DEG C, carries out the foundry goods of cast
Detection finds, cast(ing) surface local distribution the defect such as scab and sand holes, the fire-resistant difference of coating；There is Discrete Distribution in cast(ing) surface
Oxide skin and being mingled with, coating flame retardant effect is poor.
The performance test results of transfer coatings
Testing the transfer coatings prepared by embodiment 1-3 and comparative example 1-5, its result is as shown in table 1.
Table 1
Be can be seen that by the test result of table 1, transfer coatings prepared by the present invention has good suspension, good penetrability,
The strength of coating of transfer is preferable, and being firmly combined with between molding sand.
The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention.It should be pointed out that, above
Embodiment is merely to illustrate the present invention, and is not limited to protection scope of the present invention.Common skill for the art
For art personnel, under the premise without departing from the principles of the invention, it is also possible to make some improvement, these improvement also should be regarded as this
Bright protection domain.
Claims (10)
1. a magnesium alloy sand mold casts with from hard fire-retardant transfer coatings, it is characterised in that described from hard fire-retardant transfer coatings bag
Include each component of following mass fraction:
2. magnesium alloy sand mold as claimed in claim 1 casts with from hard fire-retardant transfer coatings, it is characterised in that described is heat-resisting
The granularity of aggregate is 200～320 mesh, and described heat-resisting aggregate includes the one in schmigel, magnesia powder, Pulvis Talci or graphite powder
Or several mixture.
3. magnesium alloy sand mold as claimed in claim 2 casts with from hard fire-retardant transfer coatings, it is characterised in that described heat-resisting bone
In material, the mass content of schmigel is 22.5-50%, and the mass content of magnesia powder is 22.5-40%.
4. magnesium alloy sand mold as claimed in claim 1 casts with from hard fire-retardant transfer coatings, it is characterised in that described suspension
Agent is one or more mixture in sodio rectorite powder, sodium bentonite and attapulgite.
5. magnesium alloy sand mold as claimed in claim 1 casts with from hard fire-retardant transfer coatings, it is characterised in that described bonding
Agent is one or more mixture in urea-formaldehyde-modified furane resins, water soluble phenol resin, water soluble alkyd resin.
6. magnesium alloy sand mold as claimed in claim 1 casts with from hard fire-retardant transfer coatings, it is characterised in that described coupling
Agent is silane coupler KH～550, and density is 0.94g/cm3。
7. magnesium alloy sand mold as claimed in claim 1 casts with from hard fire-retardant transfer coatings, it is characterised in that described fire retardant
Including one or more mixture in boric acid, ammonium fluoroborate, sulfur.
8. magnesium alloy sand mold as claimed in claim 7 casts with from hard fire-retardant transfer coatings, it is characterised in that described fire retardant
Each component including following weight/mass percentage composition: boric acid 45～85%, ammonium fluoroborate 4～20%, sulfur 10～40%.
9. magnesium alloy sand mold as claimed in claim 1 casts with from hard fire-retardant transfer coatings, it is characterised in that described defoamer
Including one or more mixture in organic silicon defoamer, n-butyl alcohol, n-amyl alcohol, n-octyl alcohol；Described preservative includes industry
One or more mixture in formalin, penta sodium pentachlorophenate, pentachloro-naphthols.
10. magnesium alloy sand mold as claimed in claim 1 the casting preparation method from hard fire-retardant transfer coatings, its feature
It is, comprises the following steps:
S1, weigh each raw material components according to weight/mass percentage composition；
S2, suspending agent is mixed 5～10 parts of water-powered rollers mill, add defoamer and preservative continues to mill, make A liquid；
S3, fire retardant is mixed 5～10 parts of water grind, make B liquid；
S4, the water of refractory aggregate with coupling agent, binding agent and 5～10 parts is mixed after grind, make C liquid；
S5, mixing A, B, C liquid, continue to grind after adding the water of surplus, obtains the casting of described magnesium alloy sand mold with from the most fire-retardant turn
Move coating.
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| CN107052230A (en) * | 2017-05-27 | 2017-08-18 | 大连理工大学 | A kind of alcohol radical anti-flaming dope for improving magnesium alloy mold-filling capacity and preparation method thereof |
| CN107971460A (en) * | 2017-12-23 | 2018-05-01 | 安徽鑫宏机械有限公司 | A kind of fusible pattern formwork preparation process using coating transfer method |
| CN110072308A (en) * | 2019-04-22 | 2019-07-30 | 瑞泰科技股份有限公司湘潭分公司 | A kind of graphite electrode coating and preparation method |
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| CN113976841A (en) * | 2021-12-24 | 2022-01-28 | 河北钢研德凯科技有限公司北京分公司 | Protective agent for magnesium alloy melt pouring, magnesium alloy casting and preparation method thereof |
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