CN105312489B - A kind of coating and method for improving austenite spheroidal iron casting inner flow passage flake graphite layer - Google Patents
A kind of coating and method for improving austenite spheroidal iron casting inner flow passage flake graphite layer Download PDFInfo
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Abstract
The invention discloses a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, the percentage by weight of its composition and each composition is as follows：Zirconium English powder：50‑60%；Sodium bentonite 3 5%；Preservative 2 3%；Defoamer 1 2%；Sodium alginate 0.5 2%；α starch 1 2%；Sodium silicate binder 1 2%；Water 30 40%.A kind of method for improving austenite spheroidal iron casting inner flow passage flake graphite layer is additionally provided, core is immersed in coating, is dried after taking out and is poured into a mould again.The present invention can prevent the nodularization element in the reducing gas oxidation molten iron in resin at volatilization, ensure that molten iron obtains effective nodularization, there is shielding, absorption or metathesis to sulphur, prevent sulphur from diffusing into molten iron, prevent cast(ing) surface from flake graphite occur, greatly improve the surface quality of austenite spheroidal iron casting.
Description
Technical field
The present invention relates to casting auxiliary material technical field, and in particular to one kind improves austenite spheroidal iron casting inner flow passage sheet stone
The coating and method of layer of ink.
Background technology
In austenite spheroidal iron production process, core cavity top layer face and mid-section area nodulizing grade be not larger, middle
There are 5-6 levels, make product cause to scrap in section 2-3 levels, interior cavity surface layer face, and greater loss is caused to enterprise.By to casting
Metallographic is analyzed, it is found that casting Sheet Graphite is generally present in casting upper surface and lower surface, piece not only occur in top layer
Shape graphite, and a very thin transition region between flake graphite and globular graphite be present, in quasiflake graphite, piece layer depth one
As 1~2mm.This flake graphite defect will occur in the inner flow passage surface of austenite spheroidal graphite cast-iron gas exhaust branch pipe, cooled
Cheng Zhong, its crystallization condition is internal different from it, generates the layer from internal different tissue and performance, is particularly crossed in runner
Place, tube wall thickness change at obvious thermal center and the corner with pit, has between flake graphite and globular graphite one very thin
Transition region, in metallography microscope Microscopic observation it is seen that quasiflake graphite, flake graphite thickness degree is typically in 0.025-
Between 0.035mm, most serious point forms greyness, the mechanical property of part is degenerated around the corner up to 1mm.By to casting
Constituent analysis is carried out, it is found that piece layer of ink occurs in boundary layer 0.25mm depths in magnesium iron, this area's sulfur content 0.056%, residual magnesium content
0.013%, cast product surface layer depth 0.5-3mm, average sulfur content 0.036%, residual magnesium content 0.035%, casting center sulfur content
0.018%, residual magnesium content 0.046%, it was demonstrated that cast(ing) surface sulfur content is higher.In order to avoid the hair of such situation in actual production
It is raw, is often coated using being applied on core or inner core so that it can form layer protective layer to prevent reduction graphite
The generation of layer, but existing coating can hinder the spheroidizing reacion of casting inner surface, effect is simultaneously bad.
A kind of resin sand production spheroidal graphite cast-iron coating of the disclosure of the invention of Application No. 201410443366.6 and preparation side
Method, it is made up of zirconium English powder, graphite powder, sodium bentonite, ferric oxide red powder, ferrosilicon powder, magnesia, dextrin, proportioning cost is low, system
Preparation Method is easy, can prevent cast(ing) surface from flake graphite occur, improves casting yield.The invention is for cast outer surface
Flake graphite is highly effective, but is but difficult to smear for the inner surface of casting labyrinth, uses inconvenience.
The disclosure of the invention of Application No. 201410493153.4 is a kind of to improve precision casting inner surface graphite linings thickness
Coating, the coating include organic solvent and solute, and the organic solvent is ethanol, and the solute includes bauxite 60-65 parts,
Cerium 3-6 parts are electrolysed, sodium bentonite 1-3 parts, graphite 3-7 parts, dispersant 1-1.5 parts, the Baume degrees of the coating is 62-
68 ；Using the bauxite of 200-300 mesh, graphite, sodium bentonite and electrolysis cerium, it is added the present invention in refractory material
Active electrolysis cerium so that matrix can possess good elevated temperature strength and stability, and be electrolysed cerium can promote it is nickelic
Austenite spheroidal iron spheroidal graphiteization is in progress, and reduces the formation of lamellar graphite layer.The invention is adapted to the complicated structure of casting to sheet
The elimination of graphite, but the suspension stability of the coating and caking property slightly have deficiency, defect ware occurs in actual production process
Probability is slightly higher.
The content of the invention
The present invention is to overcome above-mentioned the shortcomings of the prior art, there is provided one kind, which improves in austenite spheroidal iron casting, to flow
The coating and method of road flake graphite layer, the nodularization element in the reducing gas oxidation molten iron in resin at volatilization can be prevented, really
Protect molten iron and obtain effective nodularization, there is shielding, absorption or metathesis to sulphur, prevent sulphur to prevent from casting from diffusing into molten iron
There is flake graphite in part surface, greatly improves the surface quality of austenite spheroidal iron casting.
The technical solution adopted by the present invention is：
A kind of weight percent of the coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each composition
Than as follows：Zirconium English powder：50-60%；Sodium bentonite 3-5%；Preservative 2-3%；Defoamer 1-2%；Sodium alginate 0.5-2%；α-shallow lake
Powder 1-2%；Sodium silicate binder 1-2%；Water 30-40%.
Further, the preservative uses Nordes C15 sterilization antiseptics.
Further, the defoamer uses aqueous binder defoamer.
Further, the granularity of the sodium bentonite is 260-400 mesh.
A kind of method for improving austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
Further, the coating is stirred using de-airing mixer.
Further, with the Baume degrees of Baume degrees proportion instrument measurement coating solution after the coating stirs, ensure to apply
The Baume degrees of material is 65-70.
Further, the thickness for the resin sand core surface coating layer dried is 0.1-0.8mm.
Further, design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, drying time 20-
40 minutes.
The present invention is a kind of good shell refractory material processed using zirconium English powder, inserts suspension stability in coating of the present invention
It is good, there is excellent thixotropy and mobility, content of organics is low, and gas forming amount is small, and strength of coating is high, has to casting stronger sharp
Cold energy power, anti-stick grittiness is good, can effectively prevent casting surface defect, the bright and clean easy to clean of cast(ing) surface, and its thermal conductivity is preferable,
Facilitating the heat transfer of casting when pouring, zirconium English powder cools down rapidly cast(ing) surface and cast(ing) surface is isolated with air,
The reducing gas and sulfurous gas to be volatilized in shielding resin, prevent cast(ing) surface from producing flake graphite layer and avoiding reducing gas oxygen
Change the nodularization element in molten iron, molten iron is cannot get effective nodularization, ensured that spheroidal graphite cast-iron surface nodularization is good, improve cooling speed
Degree, reduce pouring temperature.Na-bentonite soil granularity is 260-400 mesh, is dispersed among group water solution, plays the work of suspending agent
With so that other compositions of coating may be uniformly dispersed in coating so that will not produce layering and precipitating after coating preparation and show
As improving the stability of coating.Preservative eliminates to the bacterial micro-organism in coating, is sterilized using Nordes C15 anti-
Rotten agent, the preservative are aqua type products, good with the water-based system compatibility such as coating, can be dissolved completely in water, it is ensured that coating
In the case of fine and smooth degree, ensure that coating is not encroached on during storage by bacterium and algae.Defoamer uses aqueous binder
Agent defoamer, coating surface tension force is reduced, reach good defoamer effect, defoamer defoaming, suds power are strong, brokenly bubble speed
Degree is fast, and suds length does not return bullet, thoroughly eliminates all size bubble, improves the quality of coating, and heat-resist, chemical stabilization, nothing
Burn into is nontoxic, without adverse side effect, non-ignitable not quick-fried, beneficial to using in high temperature environments.Sodium alginate is added as dispersant and applied
In material, contribute to particle to crush and prevent broken particle condense and keep dispersion stable, to zirconium English powder and sodium bentonite
Dispersion effect is preferable, it is ensured that the stability of coating.Alphalise starch is pre-gelatinized starch, orderly and unordered in amylum body（Crystalloid with it is non-
Crystalloid）Hydrogen bond between the starch molecule of state disconnects, and is dispersed in water as colloidal solution, and cohesive force is strong, viscous toughness is high, is beneficial to
The stickiness increase of coating is liable to stick to core surface, and the paint thickness on core surface can be controlled.Waterglass is silicon
The hydrate of sour sodium, cohesive force is strong, intensity is higher, acid resistance, heat-resist, can improve the caking property of coating and core, profit
In bonding of the coating on core surface.
Using coating of the present invention, the stability and caking property of coating are preferable, and permanent place does not allow perishable, the circulation of coating
Performance is good, and the dip-coating effect to core is good, can be very good to be attached to the surface of core, and the thickness of coating layer of attachment can be entered
Row control.In casting process, the nodularization element in the reducing gas oxidation molten iron in resin at volatilization can be prevented, it is ensured that molten iron
Effective nodularization is obtained, there is shielding, absorption or metathesis to sulphur, sulphur is prevented cast(ing) surface from diffusing into molten iron
There is flake graphite, greatly improve the surface quality of austenite spheroidal iron casting, reduce the occurrence probability of defect ware so that casting
Success rate it is very high and it is stable keep, huge income is created for enterprise.
The inventive method is stirred under vacuum to coating, and de-airing mixer (is contained by agitator, mixing cover, stirring power head
Two groups of stirring at low speed oars, two groups of high speed dispersers and one group scrape wall oar), temperature control device, lowering or hoisting gear, lock barrel and control system
The composition such as system, the stirring under similar vacuum environment can be carried out to coating, it is possible to reduce the generation of bubble.The complete dip-coating of core takes
Go out gently to shake and get rid of, the coating that adheres on resin sand core can be made uniform, avoid core surface coating from accumulating and occur current mark phenomenon,
Improve attachment quality of the coating on core surface.Core avoids touch surface dope layer during hanging, and causes coating thickness
Degree is uneven or coating is touched down, and causes cast(ing) surface flake graphite layer occur.Drying baker temperature is 150-200 DEG C, drying time
For 20-40 minutes, specifically need to consider the thickness of coating, temperature set the drying effect that can ensure coating in the range of this and
Dope layer is not terminated in phenomena such as dry and cracked occurs, can accelerate the setting rate of coating, accelerate the process of production.Using this method pair
Core is handled, and may be such that the dip-coating effect of coating is more preferable, coating thickness is uniform, ensures the smoothness of cast(ing) surface, greatly
The big thickness for reducing flake graphite layer.
Embodiment
Below by embodiment one to embodiment eight, the present invention will be further described.
Embodiment one
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：51%；Sodium bentonite 3.5%；Preservative 2%；Defoamer 1%；Sodium alginate
0.5%；Alphalise starch 1%；Sodium silicate binder 1%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 350 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.2mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Embodiment two
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：52%；Sodium bentonite 3.8%；Preservative 2.3%；Defoamer 1.2%；Sodium alginate
0.8%；Alphalise starch 1.2%；Sodium silicate binder 1.2%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 350 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.3mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Embodiment three
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：53%；Sodium bentonite 3.8%；Preservative 2.5%；Defoamer 1.2%；Sodium alginate
0.8%；Alphalise starch 1.2%；Sodium silicate binder 1.2%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 350 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.3mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Example IV
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：54%；Sodium bentonite 4%；Preservative 2%；Defoamer 1.2%；Sodium alginate
1.2%；Alphalise starch 1.4%；Sodium silicate binder 1.4%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 350 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.4mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Embodiment five
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：55%；Sodium bentonite 4.2%；Preservative 2.5%；Defoamer 1.5%；Sodium alginate
1.5%；Alphalise starch 1.6%；Sodium silicate binder 1.6%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 350 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.5mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Embodiment six
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：56%；Sodium bentonite 4.4%；Preservative 2.6%；Defoamer 1.6%；Sodium alginate
1.8%；Alphalise starch 1.8%；Sodium silicate binder 1.7%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 350 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.6mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Embodiment seven
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：54%；Sodium bentonite 4%；Preservative 2%；Defoamer 1.2%；Sodium alginate
1.2%；Alphalise starch 1.4%；Sodium silicate binder 1.4%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 270 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.5mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Embodiment eight
Present embodiments provide a kind of coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, its composition and each
The percentage by weight of composition is as follows：Zirconium English powder：53%；Sodium bentonite 3.8%；Preservative 2.5%；Defoamer 1.2%；Sodium alginate
0.8%；Alphalise starch 1.2%；Sodium silicate binder 1.2%；Remaining is water.
The preservative uses Nordes C15 sterilization antiseptics.
The defoamer uses aqueous binder defoamer.
The granularity of the sodium bentonite is 270 mesh.
It improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, comprises the following steps：
1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；
2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently
Jog is got rid of；
3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core top layer and apply
The bed of material, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；
4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
The coating is stirred using de-airing mixer.
The coating measures the Baume degrees of coating solution with Baume degrees proportion instrument after stirring, ensure the Baume degrees of coating
For 65-70.
The thickness for the resin sand core surface coating layer dried is 0.4mm.
Design temperature is 150-200 DEG C when the drying baker is dried to resin sand core, and drying time is 20-40 minutes.
The austenite spheroidal iron casting inner flow passage surface platelets graphite linings thickness of embodiment one to embodiment eight is detected,
And the coating property of each embodiment is monitored, draw following form：
| Project | Coating suspension stability（24 hours suspensions） | Core surface coating thickness degree（mm） | Casting flake graphite thickness degree（mm） | Defect ware probability（%） |
| Embodiment one | 99.6% | 0.2 | 0.38 | 0.13 |
| Embodiment two | 99.3% | 0.3 | 0.25 | 0.15 |
| Embodiment three | 99.1% | 0.3 | 0.15 | 0.16 |
| Example IV | 99% | 0.4 | 0.09 | 0.12 |
| Embodiment five | 98.6% | 0.5 | 0.11 | 0.18 |
| Embodiment six | 98.1% | 0.6 | 0.15 | 0.22 |
| Embodiment seven | 98.6% | 0.5 | 0.13 | 0.14 |
| Embodiment eight | 98.8% | 0.4 | 0.22 | 0.13 |
Upper table understands that suspension stability of the invention is splendid and the equadag coating thickness of acquisition is very thin so that originally
1mm graphite linings can be reached, are reduced to 0.09mm, the effect of example IV is best, and coating suspension stability is preferable, sheet stone
The thickness of layer of ink is minimum, the quality highest of casting, and the probability of defect ware is minimum, i.e., coating to the adhesion effect on core surface most
It is good.
Claims (7)
- A kind of 1. coating for improving austenite spheroidal iron casting inner flow passage flake graphite layer, it is characterised in that：Its composition and each composition Percentage by weight it is as follows：Zirconium English powder：50-60%；Sodium bentonite 3-5%；Preservative 2-3%；Defoamer 1-2%；Sodium alginate 0.5-2%；Alphalise starch 1-2%；Sodium silicate binder 1-2%；Water 30-40%, the preservative use Nordes C15 sterilization and anticorrosions Agent, the defoamer use aqueous binder defoamer.
- 2. improve the coating of austenite spheroidal iron casting inner flow passage flake graphite layer as claimed in claim 1, it is characterised in that：Institute The granularity for stating sodium bentonite is 260-400 mesh.
- 3. a kind of coating of usage right requirement 1 improves the method for austenite spheroidal iron casting inner flow passage flake graphite layer, its feature It is：Comprise the following steps：1）Coating is configured according to the percentage by weight of paint ingredient and each composition, and is stirred；2）The resin sand core made slowly is dipped into the coating solution prepared, taken out after complete dip-coating, and gently shake Get rid of；3）The resin sand core of the good coating of dip-coating is placed on clothes hanger, avoiding during placement colliding with scratches resin sand core surface coating material Layer, wait being transferred to drying baker after the no longer drip coating of resin sand core top layer and dried；4）Finally, into die cavity, pouring molten iron is molded under the resin sand core dried.
- 4. improve the method for austenite spheroidal iron casting inner flow passage flake graphite layer as claimed in claim 3, it is characterised in that：Institute Coating is stated to be stirred using de-airing mixer.
- 5. improve the method for austenite spheroidal iron casting inner flow passage flake graphite layer as claimed in claim 3, it is characterised in that：Institute State with the Baume degrees of Baume degrees proportion instrument measurement coating solution after coating stirs, the Baume degrees for ensureing coating is 65-70.
- 6. improve the method for austenite spheroidal iron casting inner flow passage flake graphite layer as claimed in claim 3, it is characterised in that：Institute The thickness for stating the resin sand core surface coating layer dried is 0.1-0.8mm.
- 7. improve the method for austenite spheroidal iron casting inner flow passage flake graphite layer as claimed in claim 3, it is characterised in that：Institute It is 150-200 DEG C to state design temperature when drying baker is dried to resin sand core, and drying time is 20-40 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510841691.2A CN105312489B (en) | 2015-11-28 | 2015-11-28 | A kind of coating and method for improving austenite spheroidal iron casting inner flow passage flake graphite layer |
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| CN108746482B (en) * | 2018-05-28 | 2019-08-06 | 南阳飞龙汽车零部件有限公司 | A kind of technique reducing Form in High Nickel Austenite Nodular Cast Iron abnormal graphite thickness |
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| CN112059105B (en) * | 2020-09-18 | 2021-03-30 | 纪汉成 | Coating for thoroughly eliminating defects of reaction layer on surface of ductile iron piece |
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