CN103042168A - Lost foam casting coating and preparation method thereof - Google Patents
Lost foam casting coating and preparation method thereof Download PDFInfo
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- CN103042168A CN103042168A CN2012105873895A CN201210587389A CN103042168A CN 103042168 A CN103042168 A CN 103042168A CN 2012105873895 A CN2012105873895 A CN 2012105873895A CN 201210587389 A CN201210587389 A CN 201210587389A CN 103042168 A CN103042168 A CN 103042168A
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Abstract
The invention discloses a lost foam casting coating, which comprises fire-proof powder, phenolic resin, white latex, calcium bentonite and isopropyl alcohol, wherein the fire-proof powder includes bauxite and quartz powder. The bauxite is formed by uniformly mixing the following components: 80% of particles with the granularity ranging from -280 to -310, 14% of particles with the granularity ranging from -280 mesh to -190 mesh and 6% of particles with the granularity ranging from -90 mesh to -190 mesh. The preparation method of the lost foam casting coating is as follows: calcining selected bauxite ore at the temperature of 1510-1550 DEG C; grinding calcined clinkers to acquire the granularity particles with the granularities respectively; evenly mixing the particles according to the composition proportion; and mixing the mixed bauxite with quartz powder, phenolic resin, white latex, calcium bentonite and isopropyl alcohol. According to the invention, bauxite is distributed according to particle sizes, and bauxite particles of different sizes are alternately arranged after even mixing. As a result, the compactness is changed, the air permeability is strengthened, the cold shut phenomenon occurring between liquid metal and the coating is avoided, and finally the quality of the casting produced through lost foam casting is improved.
Description
Technical field
The invention belongs to the metal casting technical field, be specifically related to a kind of lost foam casting coating, also design simultaneously the preparation method of this coating.
Background technology
Evaporative pattern is a kind of casting technique that can obtain well mould casting compared to sand mo(u)ld.Its casting process is roughly, and at first adopting foam is that raw material are produced the bubbles model identical with the foundry goods shape; Secondly daub forms coating and oven dry on bubbles model; Fill out molding sand after again will drying around the cated bubbles model of tool; Casting in the most backward bubbles model, knockout obtains foundry goods after cooling.In said process, can the performance that the coating of smearing on the bubbles model has be the key point that determines obtain castings.
Traditional cast paint generally comprises refractory material, binding agent, suspending agent, surfactant, defoamer and carrier, and the acting in conjunction by these materials makes and obtains stopping isolation between foundry goods and the molding sand, reaches to prevent the purpose of molding sand scab to the foundry goods.But in order to obtain accurate foundry goods, then must further promote the gas permeability of coating itself, being coated with property, coating intensity, fire resistance, shelling.And the gas permeability that refractory material is born among above-mentioned these performances is the most important.Refractory material is the skeleton of coating, thereby heat resistance, intensity and the gas permeability etc. that can guarantee coating are avoided the defectives such as scab, burr, obtained smooth surface.And the existing employed even particle size of refractory material does not form the ladder distribution design, has hindered the body liter of refractory material permeability, and then has restricted the raising of lost foam casting products obtained therefrom quality.Its reason is, when high temperature fluent metal flows into bubbles model, bubbles model can melt and is liquid state, and then is decomposed into gaseous state, and the position that bubbles model disappears then obtains metal filled very soon.In the process that liquid metal is filled, if the gas that the air that bubbles model carries and decomposition produce can not in time be discharged by coating, then can be gathered between liquid metal and the coating, the pressure that produces therefrom can delay flowing of metal, even can cause the generation of cold shut.
Summary of the invention
In view of this, the invention provides a kind of lost foam casting coating and preparation method thereof, make coating possess good permeability, and then promote the casting product quality that lost foam casting goes out.
For solving above technical problem, technical scheme of the present invention is, a kind of lost foam casting coating, comprise refractory powder, phenolic resins, white glue with vinyl, calcium bentonite and isopropyl alcohol, described refractory powder comprises bauxite and silica flour, to-310 order particles, 14%-280 orders are to-190 order particles by 80%-280 orders for this bauxite, and 6%-90 orders mix to-190 purpose uniform particles and form.
Further, described bauxite is 80.1%～83.3%; Silica flour is 9.1%～9.8%; Phenolic resins is 2.2%～3.5%; White glue with vinyl is 1.7%～1.9%; Calcium bentonite is 3.1%～4.4%; Isopropyl alcohol is 0.3%～0.4%.
Further, described bauxite is 81.5%; Silica flour is 9.5%; Phenolic resins is 2.8%; White glue with vinyl is 1.8%; Calcium bentonite is 3.5%; Isopropyl alcohol is 0.35%.
Further, described refractory powder also comprises one or more combinations in fused quartz powder, zirconium English powder, magnesia powder, forsterite powder, brown alundum powder and the white alundum powder.
A kind of preparation method of coating, concrete steps are as follows:
Step 1, aluminium alumina ore are calcined under 1510 ℃～1550 ℃ temperature;
Step 2, the grog that section is obtained after a while grind, and obtain respectively-280 orders to-310 order particles, and-280 orders are to-190 order particles, and 90 orders are to-190 purpose particles;
Step 3 ,-280 orders according to 80% are to-310 order particles, and 14%-280 orders are to-190 order particles, and 6%-90 orders to-190 purpose particles evenly mix;
Step 4, bauxite and silica flour, phenolic resins, white glue with vinyl, calcium bentonite and the isopropyl alcohol that mixes mixed.
Further, described step 2 obtains behind the grog particle particle to be carried out pickling processes and dry, more dried grog particle is carried out mixing match according to ratio described in the step 3.
Further, described step 4 is 80.1%～83.3% according to bauxite; Silica flour is 9.1%～9.8%; Phenolic resins is 2.2%～3.5%; White glue with vinyl is 1.7%～1.9%; Calcium bentonite is 3.1%～4.4%; Isopropyl alcohol is 0.3%～0.4% ratio mixing.
Further, described step 4 is 81.5% according to bauxite; Silica flour is 9.5%; Phenolic resins is 2.8%; White glue with vinyl is 1.8%; Calcium bentonite is 3.5%; Isopropyl alcohol is 0.35% ratio mixing.
Compared with prior art, the present invention with the bauxite in the refractory material according to the granular size setting that distributes, after even mixing, the bauxite particle of different sizes is staggered, change compactness with this, and then strengthen gas permeability, possess good permeability compared to the bauxite particle that has same particle sizes level in the coating now, avoided in casting process the appearance of cold shut phenomenon between liquid metal and the coating.So adopt coating provided by the present invention, can improve the casting quality of lost foam casting gained.
The specific embodiment
In order to make those skilled in the art understand better technical scheme of the present invention, the present invention is described in further detail below in conjunction with specific embodiment.
A kind of lost foam casting coating comprises refractory powder, phenolic resins, white glue with vinyl, calcium bentonite and isopropyl alcohol.Wherein, refractory powder comprises bauxite and silica flour.Because granularity and the size distribution of bauxite are the key factors that affects lost foam casting used coating gas permeability, can the thermal decomposition product of foam plastics mould in sintering process discharge smoothly by coating, and the gas permeability of lost foam paint is key point.So the present invention is made into different size with the particle size fraction of bauxite, improve the gas permeability of coating with this.
Among the present invention, to-310 order particles, 14%-280 orders are to-190 order particles by 80%-280 orders for bauxite, and 6%-90 orders mix to-190 purpose uniform particles and form.
The coating that the present invention makes, after bubbles model was brushed, coating normal temperature gas permeability was higher than 12cm
2(kPamin)
-1, hot permeability is greater than 22cm
2(kPamin)
-1
Because the bauxite that different grain size level proportioning forms also needs could form coating with other component common combinations.So now each component in the coating is described further, specific as follows:
Embodiment 1-1
Bauxite is 80.1%～83.3%; Silica flour is 9.1%～9.8%; Phenolic resins is 2.2%～3.5%; White glue with vinyl is 1.7%～1.9%; Calcium bentonite is 3.1%～4.4%; Isopropyl alcohol is 0.3%～0.4%.
Embodiment 1-2
Bauxite is 81.5%; Silica flour is 9.5%; Phenolic resins is 2.8%; White glue with vinyl is 1.8%; Calcium bentonite is 3.5%; Isopropyl alcohol is 0.35%.
Need to prove that refractory powder also comprises one or more combinations in fused quartz powder, zirconium English powder, magnesia powder, forsterite powder, brown alundum powder and the white alundum powder among the present invention.In addition, the present invention all adopts water as the carrier of coating.
The present invention also provides a kind of preparation method of coating, and concrete steps are as follows:
Step 1, aluminium alumina ore are calcined under 1510 ℃～1550 ℃ temperature;
Step 2, the grog that section is obtained after a while grind, and obtain respectively-280 orders to-310 order particles, and-280 orders are to-190 order particles, and 90 orders are to-190 purpose particles;
Step 3 ,-280 orders according to 80% are to-310 order particles, and 14%-280 orders are to-190 order particles, and 6%-90 orders to-190 purpose particles evenly mix;
Step 4, bauxite and silica flour, phenolic resins, white glue with vinyl, calcium bentonite and the isopropyl alcohol that mixes mixed.
Embodiment 2-1
Step 1, aluminium alumina ore are calcined under 1510 ℃～1550 ℃ temperature;
Step 2, the grog that section is obtained after a while grind, and obtain respectively-280 orders to-310 order particles, and-280 orders are to-190 order particles, and 90 orders are to-190 purpose particles;
Step 3 ,-280 orders according to 80% are to-310 order particles, and 14%-280 orders are to-190 order particles, and 6%-90 orders to-190 purpose particles evenly mix;
Step 4, with the bauxite that mixes according to, bauxite is 80.1%～83.3%; Silica flour is 9.1%～9.8%; Phenolic resins is 2.2%～3.5%; White glue with vinyl is 1.7%～1.9%; Calcium bentonite is 3.1%～4.4%; Isopropyl alcohol is 0.3%～0.4% ratio mixing.
Embodiment 2-2
Step 1, aluminium alumina ore are calcined under 1510 ℃～1550 ℃ temperature;
Step 2, the grog that section is obtained after a while grind, and obtain respectively-280 orders to-310 order particles, and-280 orders are to-190 order particles, and 90 orders are to-190 purpose particles;
Step 3 ,-280 orders according to 80% are to-310 order particles, and 14%-280 orders are to-190 order particles, and 6%-90 orders to-190 purpose particles evenly mix;
Step 4, with the bauxite that mixes according to, bauxite is 81.5%; Silica flour is 9.5%; Phenolic resins is 2.8%; White glue with vinyl is 1.8%; Calcium bentonite is 3.5%; Isopropyl alcohol is 0.35% ratio mixing.
Because bauxitization studies and is divided into Al
2O
3, also contain simultaneously TiO
2, FeO
3Deng impurity.Sintering temperature and TiO
2, FeO
3Larger on the coating impact Deng impurity content.Simultaneously, go back because of bauxite in the process of grinding, milling apparatus mostly is high violent steel casting, is difficult to remove with magnetic separation after sneaking into.So the bauxite particle after grinding, also should carry out one pickling processes, to remove impurity.After step 2 obtains the grog particle, particle is carried out pickling processes and dry, then dried grog particle is carried out mixing match according to ratio described in the step 3.
Only be preferred embodiment of the present invention below, should be pointed out that above-mentioned preferred embodiment should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with the claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. lost foam casting coating, comprise refractory powder, phenolic resins, white glue with vinyl, calcium bentonite and isopropyl alcohol, it is characterized in that: described refractory powder comprises bauxite and silica flour, this bauxite by 80%-280 orders to-310 order particles, 14%-280 orders are to-190 order particles, and 6%-90 orders mix to-190 purpose uniform particles and form.
2. lost foam casting coating as claimed in claim 1, it is characterized in that: described bauxite is 80.1%～83.3%; Silica flour is 9.1%～9.8%; Phenolic resins is 2.2%～3.5%; White glue with vinyl is 1.7%～1.9%; Calcium bentonite is 3.1%～4.4%; Isopropyl alcohol is 0.3%～0.4%.
3. lost foam casting coating as claimed in claim 2, it is characterized in that: described bauxite is 81.5%; Silica flour is 9.5%; Phenolic resins is 2.8%; White glue with vinyl is 1.8%; Calcium bentonite is 3.5%; Isopropyl alcohol is 0.35%.
4. lost foam casting coating as claimed in claim 1, it is characterized in that: described refractory powder also comprises one or more combinations in fused quartz powder, zirconium English powder, magnesia powder, forsterite powder, brown alundum powder and the white alundum powder.
5. the preparation method of coating as claimed in claim 1, concrete steps are as follows:
Step 1, aluminium alumina ore are calcined under 1510 ℃～1550 ℃ temperature;
Step 2, the grog that section is obtained after a while grind, and obtain respectively-280 orders to-310 order particles, and-280 orders are to-190 order particles, and 90 orders are to-190 purpose particles;
Step 3 ,-280 orders according to 80% are to-310 order particles, and 14%-280 orders are to-190 order particles, and 6%-90 orders to-190 purpose particles evenly mix;
Step 4, bauxite and silica flour, phenolic resins, white glue with vinyl, calcium bentonite and the isopropyl alcohol that mixes mixed.
6. preparation method as claimed in claim 5 is characterized in that: behind the described step 2 acquisition grog particle particle is carried out pickling processes and dry, more dried grog particle is carried out mixing match according to ratio described in the step 3.
7. preparation method as claimed in claim 5 is characterized in that: further, described step 4 is 80.1%～83.3% according to bauxite; Silica flour is 9.1%～9.8%; Phenolic resins is 2.2%～3.5%; White glue with vinyl is 1.7%～1.9%; Calcium bentonite is 3.1%～4.4%; Isopropyl alcohol is 0.3%～0.4% ratio mixing.
8. preparation method as claimed in claim 7 is characterized in that: further, described step 4 is 81.5% according to bauxite; Silica flour is 9.5%; Phenolic resins is 2.8%; White glue with vinyl is 1.8%; Calcium bentonite is 3.5%; Isopropyl alcohol is 0.35% ratio mixing.
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|---|---|---|---|
| CN201210587389.5A CN103042168B (en) | 2012-12-30 | 2012-12-30 | Lost foam casting coating and preparation method thereof |
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|---|---|---|---|
| CN201210587389.5A CN103042168B (en) | 2012-12-30 | 2012-12-30 | Lost foam casting coating and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103042168A true CN103042168A (en) | 2013-04-17 |
| CN103042168B CN103042168B (en) | 2015-06-03 |
Family
ID=48055160
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