CN102407275B - Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof - Google Patents

Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof Download PDF

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CN102407275B
CN102407275B CN 201110104862 CN201110104862A CN102407275B CN 102407275 B CN102407275 B CN 102407275B CN 201110104862 CN201110104862 CN 201110104862 CN 201110104862 A CN201110104862 A CN 201110104862A CN 102407275 B CN102407275 B CN 102407275B
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parts
coating
powder
water
agitator
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CN 201110104862
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CN102407275A (en
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黄晋
张友寿
夏露
李四年
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湖北工业大学
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Abstract

The invention relates to an expendable pattern casting (EPC) molding shell paint for casting steel, and the EPC molding shell paint comprises surface a layer fireproof paint and a back layer reinforcing paint, wherein the surface layer fireproof paint comprises the following components in parts by weight: 80-90 parts of high-chromium alundum powder, 10-20 parts of calcined kaolinite, 6-8 parts of calcium rectorite powder, 1-3 parts of sodium tripolyphosphate, 3-5 parts of polyvinyl formal solution, 0.3-0.5 part of ethoxylated alkyl sodium sulfate, 0.6-1.0 part of polyether type modified polydimethylsiloxane and 60-75 parts of water; and the back layer reinforcing paint comprises the following components in parts by weight: 75-85 parts of coal gangue sand, 15-25 parts of kaolinite, 3-6 parts of feldspar powder, 8-13 parts of calcium rectorite powder, 8-10 parts of sodium tripolyphosphate, 1.5-2.0 parts of wood fiber and 30-45 parts of water. A molding shell manufactured by the surface layer fireproof paint and the back layer reinforcing paint has the characteristics of high strength and refractoriness, good air permeability and the like.

Description

A kind of cast steel lost foam casting shell coating and preparation method thereof
Technical field
The present invention relates to metal material processing and metallurgical class technical field, specifically a kind of cast steel lost foam casting shell coating and preparation method thereof.
Background technology
The Negative casting of EPC method is that the running and feeding system bonding that will make with the identical plastic foam model of casting dimension shape and identical material is combined into model cluster, after brushing lost foam paint and drying, be embedded in vibration ramming moulding in the dry sand of special shape mo(u)lding box, connecting special shape mo(u)lding box with vacuum equipment vacuumizes, in casting mold, pour into a mould high-temperature liquid metal under the condition of the certain negative pressure of maintenance, make model melting and gasification, catabolite is overflowed by the casting mold interface, liquid metal occupies modal position, solidifies the rear a kind of casting method that forms foundry goods of cooling.The outstanding advantages such as lost foam casting has the casting dimension accuracy height, pollutes less, cost is low are described as " foundry engieering of 21 century " and " green revolution of foundary industry ".
Different from the common sand cast paint, coating for dispellable mould casting is not to be coated on the casting mold die cavity, but is coated on the foamed polystyrene pattern.When foamed polystyrene pattern was replaced by liquid metal, what in fact coating played was the casting mold effect, thereby saying of " coating namely being casting mold " arranged.During cast, a large amount of gases that the foamed plastics thermal decomposition produces will can be discharged outside the casting mold by space between fireproof coating and dry sand.Fireproof coating plays a very important role formation of gasification, molten metal filling and the foundry goods of evaporative pattern apperance etc.
Coating be Negative casting of EPC success ground for the production of one of three large crucial technological factors, it is the key measure that guarantees surface quality of continuous castings and prevent various defectives.The character of coating not only affects the gasification of apperance and the migration of gas, and all closely related with surface quality of continuous castings, blemish, casting accuracy and even the internal quality of casting etc.
Negative casting of EPC coating mainly is comprised of refractory aggregate, suspending agent, low temperature bonding agent, high-temperature agglomerant, defoamer, wetting agent and carrier.Refractory aggregate adopts zirconium English powder, silica flour, bauxite, schmigel, mullite powder, aquamaine stone flour etc. more; Suspending agent adopts sodium bentonite, attapulgite, lithium bentonite, SN suspending agent etc. more, white glue with vinyl, water soluble phenol resin, syrup, polyvinyl alcohol etc. are adopted in the low temperature bonding agent more, high-temperature agglomerant adopts waterglass, Ludox, aluminum sulfate, aluminium dihydrogen phosphate etc. more, and thickener adopts sodium carboxymethylcellulose (CMC) etc. more; Defoamer adopts tributyl phosphate, n-butanol, n-octyl alcohol etc.; Wetting agent adopts JFC, OP10, neopelex more; Carrier all adopts water.The preparation method of coating is directly refractory aggregate, binding agent, carrier, surfactant to be poured into to stir for a long time in the mixer or grind in colloid mill and make.
But, the Negative casting of EPC method of prior art, have the casting flaws such as cast(ing) surface carburizing, pore, slag inclusion when producing mild steel, low-carbon alloy steel, be difficult to solve, this has just limited the Negative casting of EPC method in the application of producing on mild steel and the low-carbon alloy steel.
Summary of the invention
The invention provides a kind of cast steel lost foam casting shell coating and Shell Preparation method thereof, it becomes evaporative pattern shell casting with the Negative casting of EPC method, and the evaporative pattern shell of making of this coating has the characteristics such as intensity height, refractoriness height, good permeability.There are not any organic matters such as foam in its shell, are used for the cast of the steel-castings such as mild steel, low-carbon alloy steel, avoided steel-casting to produce the defectives such as carburizing, pore, slag inclusion, guaranteed its end product quality.
A kind of cast steel comprises surface layer fireproof coating and backing layer doped coating with lost foam casting shell coating, and each component of described surface layer fireproof coating according to the weight portion proportioning is: refractory powder: 80~90 parts in high pink fused alumina powder, 10~20 parts of calcined kaolins; Suspending agent: 6~8 parts in calcium rectorite powder; Binding agent: 1~3 part of sodium phosphate trimer; Thickener: 3~5 parts of polyvinyl formal solution; Wetting agent: 0.3~0.5 part of ethoxylated alkyl sulfate; Defoamer: 0.6~1.0 part of polyether-type modified dimethyl polysiloxane; Carrier: 60~75 parts in water;
Described each component of backing layer doped coating according to the weight portion proportioning is: refractory aggregate: 75~85 parts of bastard coal stone sands, 15~25 parts of kaolin; Agglutinant: 3~6 parts of feldspars in powder; Suspending agent: 8~13 parts in calcium rectorite powder; Binding agent: 8~10 parts of sodium phosphate trimers; Reinforcing agent: 1.5~2.0 parts of wood fibres; Carrier: 30~45 parts in water.
A kind of cast steel comprises the steps: with the preparation method of lost foam casting shell coating
Preparation surface layer fireproof coating:
1) with 1~3 part of sodium phosphate trimer, 〉=20~30 parts of mix and blends in agitator of hot water of 80 ℃, after being dissolved into transparence, add 3~5 parts of polyvinyl formal solution, 0.3~0.5 part of ethoxylated alkyl sulfate, stir, add again 6~8 parts in calcium rectorite powder, pour into after the stirring in the colloid mill, grind 10~15min, form even prefabricated auxiliary agent lotion, put into agitator;
2) in being poured into, 20~25 parts in 80~90 parts in high pink fused alumina powder, 10~20 parts of calcined kaolins, water have in the agitator of prefabricated auxiliary agent lotion, pour colloid mill after stirring into and grind 10~15min, put into agitator, add again 15~20 parts in water, 0.6~1.0 part of polyether-type modified dimethyl polysiloxane, stir 30~35min and become uniform sizing material, add 0~5 part in water and adjust slurry density to 1.50~1.70g/cm 3Described surface layer fireproof coating;
Preparation backing layer doped coating:
1) with 8~10 parts of sodium phosphate trimers, 〉=25~30 parts of mix and blends in agitator of hot water of 80 ℃, add again 8~13 parts in calcium rectorite powder, 3~6 parts of feldspars in powder, pour colloid mill after the stirring into, grind 10~15min, form even prefabricated auxiliary agent lotion, put into agitator;
2) in being poured into, 10~15 parts of 75~85 parts of bastard coal stone sands, 15~25 parts of kaolin, 1.5~2.0 parts of wood fibres, water have in the agitator of prefabricated auxiliary agent lotion, stir 30~35min and become uniform sizing material, add 0~3 part in water and adjust slurry density to 1.80~2.10g/cm 3Described backing layer doped coating.
The investment shell intensity that surface layer fireproof coating of the present invention and backing layer doped coating are made is high, can guarantee that shell is not damaged in carrying, cast molten steel process; The shell refractoriness is high, can guarantee at high temperature scorification not of the shell inner surface that contacts with molten steel, makes steel casting surface bright and clean; The shell good permeability can guarantee that pockmark and wrinkle do not appear in steel casting surface.
The specific embodiment
Below in conjunction with embodiment the present invention is further specified.
Embodiment 1: the surface layer fireproof coating makes one
Prefabricated auxiliary agent lotion: with 1.5 parts of sodium phosphate trimers, 20 parts of mix and blends in agitator of hot water (〉=80 ℃), be dissolved into transparence after, add 4 parts of polyvinyl formal solution, 0.3 part of ethoxylated alkyl sulfate, stir; Add again 6 parts in calcium rectorite powder, pour into after the stirring and grind 10min in the colloid mill, form even lotion, put into agitator;
85 parts in high pink fused alumina powder, 15 parts of calcined kaolins, 20 parts in water, have in pouring into stir in the agitator of prefabricated auxiliary agent lotion after, pour into and grind 10min in the colloid mill, put into agitator, add again 20 parts in water, 0.6 part of polyether-type modified dimethyl polysiloxane, stir 30min and become uniform sizing material, add 0~5 part in water, adjust slurry density 1.50~1.70g/cm 3.
Embodiment 2: the surface layer fireproof coating makes two
Prefabricated auxiliary agent lotion: with 2 parts of sodium phosphate trimers, 25 parts of mix and blends in agitator of hot water (〉=80 ℃), be dissolved into transparence after, add 3 parts of polyvinyl formal solution, 0.5 part of ethoxylated alkyl sulfate, stir; Add again 8 parts in calcium rectorite powder, pour into after the stirring and grind 12min in the colloid mill, form even lotion, put into agitator.
80 parts in high pink fused alumina powder, 20 parts of calcined kaolins, 25 parts in water, have in pouring into stir in the agitator of prefabricated auxiliary agent lotion after, pour into and grind 15min in the colloid mill, put into agitator, add again 20 parts in water, 0.8 part of polyether-type modified dimethyl polysiloxane, stir 32min and become uniform sizing material, add 0~5 part in water, adjust slurry density to 1.50~1.70g/cm 3.
Embodiment 3: the surface layer fireproof coating makes three
Prefabricated auxiliary agent lotion: with 2.5 parts of sodium phosphate trimers, 30 parts of mix and blends in agitator of hot water (〉=80 ℃), be dissolved into transparence after, add 3 parts of polyvinyl formal solution, 0.5 part of ethoxylated alkyl sulfate, stir; Add again 7 parts in calcium rectorite powder, pour into after the stirring and grind 15min in the colloid mill, form even lotion, put into agitator.
90 parts in high pink fused alumina powder, 10 parts of calcined kaolins, 20 parts in water, have in pouring into stir in the agitator of prefabricated auxiliary agent lotion after, pour into and grind 12min in the colloid mill, put into agitator, add again 15 parts in water, 0.7 part of polyether-type modified dimethyl polysiloxane, stir 35min and become uniform sizing material, add 0~5 part in water, adjust slurry density to 1.50~1.70g/cm 3.
Wherein, high pink fused alumina powder is to be mixed by the two kinds high pink fused alumina powder that granularity is respectively 200 orders (accounting for 75~80%) and 320 orders (accounting for 20~25%) in this surface layer fireproof coating, wherein chemical composition Al 2O 3+ Cr 2O 3〉=90%.
Wherein, calcined kaolin is 〉=1400 ℃ of calcination of chamotte in this surface layer fireproof coating, and granularity is 320 orders.
Wherein, calcium rectorite powder is 200 orders in this surface layer fireproof coating, wherein calcium rectorite content 〉=80%.
Wherein, polyvinyl formal solution solid content is 40~45% in this surface layer fireproof coating.
Embodiment 4: the backing layer doped coating makes one
Prefabricated auxiliary agent lotion: with 8 parts of sodium phosphate trimers, 25 parts of hot water (〉=80 ℃), place the agitator mix and blend, add again 10 parts in calcium rectorite powder, 3 parts of feldspars in powder, pour into after the stirring and grind 10min in the colloid mill, form even lotion, put into agitator.
Have in the agitator of prefabricated auxiliary agent lotion in 10 parts of 75 parts of bastard coal stone sands, 25 parts of kaolin, 1.5 parts of wood fibres, water are poured into, stir 30min and become uniform sizing material, add 0~3 part in water, adjust slurry density to 1.80~2.10g/cm 3Degree.
Embodiment 5: the backing layer doped coating makes two
Prefabricated auxiliary agent lotion: with 10 parts of sodium phosphate trimers, 30 parts of mixing and stirring in agitator of hot water (〉=80 ℃), add again 13 parts of calcium rectorites, 5 parts of feldspars in powder, pour into after the stirring and grind 12min in the colloid mill, form even lotion, put into agitator.
Have in the agitator of prefabricated auxiliary agent lotion in 15 parts of 80 parts of bastard coal stone sands, 20 parts of kaolin, 2 parts of wood fibres, moisture content are poured into, stir 32min and become uniform sizing material, add 0~3 part in water, adjust slurry density to 1.8~2.10g/cm 3Degree.
Embodiment 6: the backing layer doped coating makes three
Prefabricated auxiliary agent lotion: with 9 parts of sodium phosphate trimers, 30 parts of mixing and stirring in agitator of hot water (〉=80 ℃), add again 8 parts of calcium rectorites, 6 parts of feldspars in powder, pour into after the stirring and grind 15min in the colloid mill, form even lotion, put into agitator.
Have in the agitator of prefabricated auxiliary agent lotion in 15 parts of 85 parts of bastard coal stone sands, 15 parts of kaolin, 2 parts of wood fibres, moisture content are poured into, stir 35min and become uniform sizing material, add 0~3 part in water, adjust slurry density to 1.8~2.10g/cm 3Degree.
Wherein, the bastard coal stone sand is respectively 30/50 order (accounting for 70~80%) by granularity and two kinds of bastard coal stone sands of 50/100 order (accounting for 20~30%) mix in this backing layer doped coating.
Wherein, kaolin is 320 order original ore powders in this backing layer doped coating.
Wherein, feldspar in powder is 500~600 order superfine powders in this backing layer doped coating.
Wherein, wood fibre length is 2~5mm in this backing layer doped coating.
The process of manufacturing lost foam casting shell and production steel-casting with these two kinds of coating (surface layer fireproof coating and backing layer doped coating) is: be coated with first the liners fireproof coating 2 times with the polystyrene foam mould, be coated with the backing layer doped coating 2 times again.Whenever after being coated with coating, must place air themperature is 50~60 ℃ of drying rooms or more than the dry 5h of baking oven.4 times coating is coated with, (coating layer thickness is about 3~5mm), and the foam mould is placed roaster, evenly is warmed to 800~850 ℃ after finishing for drying, insulation 30min, foam mould decompose vaporization and fall the dope layer ceramic, form the hollow shell, and shell taken out from stove store for future use.Before the cast, shell is put into baker, behind 200~800 ℃, insulation 1h baking, take out and place sandbox, strengthen with the iron sand landfill, only expose cup or open riser, then pour into a mould molten steel.
The investment shell intensity that utilizes surface layer fireproof coating of the present invention and backing layer doped coating to make is high, can guarantee that shell is not damaged in carrying, cast molten steel process; The shell refractoriness is high, can guarantee at high temperature scorification not of the shell inner surface that contacts with molten steel, makes steel casting surface bright and clean; The shell good permeability can guarantee that pockmark and wrinkle do not appear in steel casting surface.The refractoriness of shell is that the high-melting-point of refractory aggregate, suspending agent in the leading surface coating guarantees, the fusing point of high pink fused alumina fusing point 〉=1850 ℃, calcined kaolin fusing point 〉=1770 ℃, calcium rectorite 〉=1600 ℃ wherein, the pouring temperature (1540~1600 ℃) that all is higher than molten steel has guaranteed the refractoriness of shell; The gas permeability of shell is that leading surface coating refractory powder and backing layer doped coating refractory aggregate granular size are regulated, for example can comprise in the surface layer refractory powder in the high pink fused alumina meal of 200 purposes material about 75~80%, the backing layer doped coating refractory aggregate and can comprise 70~80% 30/50 purpose Coarse Coal spoil sand, these all can provide cellular structure in shell, the ventilative value of the ventilative value of assurance shell surface layer fireproof coating 〉=100, backing layer doped coating 〉=500; Sodium phosphate trimer in the coating can polycondensation become large molecule in air or thermal dehydration, makes shell have higher normal temperature strength, its bending strength 〉=4.5MPa; Shell is through 〉=800 ℃ of roastings, and the kaolin in the coating, calcium rectorite, potassic feldspar, sodium phosphate trimer etc. can produce the solid, liquid phase sintering with refractory powder (bone) material, form ceramic structure, its bending strength 〉=10MPa.In addition, potassic feldspar, sodium phosphate trimer also help to reduce the shell sintering temperature, shorten sintering time, have improved production efficiency and have reduced cost.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly belongs to those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (9)

1. a cast steel is characterized in that with lost foam casting shell coating: comprise surface layer fireproof coating and backing layer doped coating,
Each component of described surface layer fireproof coating according to the weight portion proportioning is: refractory powder: 80~90 parts in high pink fused alumina powder, 10~20 parts of calcined kaolins; Suspending agent: 6~8 parts in calcium rectorite powder; Binding agent: 1~3 part of sodium phosphate trimer; Thickener: 3~5 parts of polyvinyl formal solution; Wetting agent: 0.3~0.5 part of ethoxylated alkyl sulfate; Defoamer: 0.6~1.0 part of polyether-type modified dimethyl polysiloxane; Carrier: 60~75 parts in water;
Described each component of backing layer doped coating according to the weight portion proportioning is: refractory aggregate: 75~85 parts of bastard coal stone sands, 15~25 parts of kaolin; Agglutinant: 3~6 parts of feldspars in powder; Suspending agent: 8~13 parts in calcium rectorite powder; Binding agent: 8~10 parts of sodium phosphate trimers; Reinforcing agent: 1.5~2.0 parts of wood fibres; Carrier: 30~45 parts in water.
2. cast steel as claimed in claim 1 is with lost foam casting shell coating, it is characterized in that: the high pink fused alumina powder in the described surface layer fireproof coating is to be respectively 200 orders and two kinds high pink fused alumina powder of 320 purposes mix by granularity, wherein the high pink fused alumina powder of 200 purposes accounts for 75%~80%, the high pink fused alumina powder of 320 purposes accounts for 20%~25%, wherein chemical composition Al 2O 3+ Cr 2O 3〉=90%.
3. cast steel as claimed in claim 1 is with lost foam casting shell coating, and it is characterized in that: the calcined kaolin in the described surface layer fireproof coating is 〉=1400 ℃ of calcination of chamotte, and granularity is 320 orders.
4. cast steel as claimed in claim 1 is with lost foam casting shell coating, and it is characterized in that: the calcium rectorite powder in the described surface layer fireproof coating is 200 orders, wherein calcium rectorite content 〉=80%.
5. cast steel as claimed in claim 1 is with lost foam casting shell coating, and it is characterized in that: the polyvinyl formal solution solid content in the described surface layer fireproof coating is 40~45%.
6. cast steel as claimed in claim 1 is with lost foam casting shell coating, and it is characterized in that: the kaolin of described backing layer doped coating is 320 order original ore powders.
7. cast steel as claimed in claim 1 is with lost foam casting shell coating, and it is characterized in that: the feldspar in powder of described backing layer doped coating is 500~600 order superfine powders.
8. cast steel as claimed in claim 1 is with lost foam casting shell coating, and it is characterized in that: the wood fibre length of described backing layer doped coating is 2~5mm.
9. the preparation method of a cast steel usefulness lost foam casting shell coating is characterized in that: comprise the steps:
Preparation surface layer fireproof coating:
1) with 1~3 part of sodium phosphate trimer, 〉=20~30 parts of mix and blends in agitator of hot water of 80 ℃, after being dissolved into transparence, add 3~5 parts of polyvinyl formal solution, 0.3~0.5 part of ethoxylated alkyl sulfate, stir, add again 6~8 parts in calcium rectorite powder, pour into after the stirring in the colloid mill, grind 10~15min, form even prefabricated auxiliary agent lotion, put into agitator;
2) in being poured into, 20~25 parts in 80~90 parts in high pink fused alumina powder, 10~20 parts of calcined kaolins, water have in the agitator of prefabricated auxiliary agent lotion, pour colloid mill after stirring into and grind 10~15min, put into agitator, add again 15~20 parts in water, 0.6~1.0 part of polyether-type modified dimethyl polysiloxane, stir 30~35min and become uniform sizing material, add 0~5 part in water and adjust slurry density to 1.50~1.70g/cm 3Described surface layer fireproof coating;
Preparation backing layer doped coating:
1) with 8~10 parts of sodium phosphate trimers, 〉=25~30 parts of mix and blends in agitator of hot water of 80 ℃, add again 8~13 parts in calcium rectorite powder, 3~6 parts of feldspars in powder, pour colloid mill after the stirring into and grind 10~15min, form even prefabricated auxiliary agent lotion, put into agitator;
2) in being poured into, 10~15 parts of 75~85 parts of bastard coal stone sands, 15~25 parts of kaolin, 1.5~2.0 parts of wood fibres, water have in the agitator of prefabricated auxiliary agent lotion, stir 30~35min and become uniform sizing material, add 0~3 part in water and adjust slurry density to 1.80~2.10g/cm 3Described backing layer doped coating.
CN 201110104862 2011-04-25 2011-04-25 Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof CN102407275B (en)

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