CN103042168B - Lost foam casting coating and preparation method thereof - Google Patents
Lost foam casting coating and preparation method thereof Download PDFInfo
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- CN103042168B CN103042168B CN201210587389.5A CN201210587389A CN103042168B CN 103042168 B CN103042168 B CN 103042168B CN 201210587389 A CN201210587389 A CN 201210587389A CN 103042168 B CN103042168 B CN 103042168B
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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 metal casting technique field, be specifically related to a kind of lost foam casting coating, also design the preparation method of this coating simultaneously.
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 first adopts foam to be that the bubbles model identical with cast shape produced by raw material; Secondly on bubbles model, daub forms coating and dries; Again the cated bubbles model surrounding of tool after oven dry is filled out molding sand; Casting in the most backward bubbles model, knockout obtains foundry goods after cooling.In above process, can the performance that the coating that bubbles model is smeared has be the key point determining obtain castings.
Traditional cast paint generally comprises refractory material, binding agent, suspending agent, surfactant, defoamer and carrier, makes to obtain between foundry goods and molding sand stopping isolation, reach and prevent molding sand scab to the object on foundry goods by the acting in conjunction of these materials.But in order to obtain accurate foundry goods, then further must 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 these performances above-mentioned is the most important.Refractory material is the skeleton of coating, can ensure the heat resistance of coating, intensity and gas permeability etc. thus avoid the defect such as scab, burr, acquisition smooth surface.And the even particle size that existing refractory material uses does not form ladder distribution design, hinder the body liter of refractory material permeability, and then constrain 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 as 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 air that bubbles model carries and the gas that decomposition produces are not discharged in time by coating, then can be gathered between liquid metal and coating, the pressure produced therefrom can delay the 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 the casting product quality that lifting 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, this bauxite by 80%-280 orders to+310 order particles ,+280 orders of 14% are to-190 order particles, and-90 orders of 6% are to+190 object uniform particles mixing compositions.
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 refractory powder also comprises one or more combinations in fused quartz powder, zirconium English powder, magnesia powder, forsterite powder, brown alundum powder and white alundum powder.
A preparation method for coating, concrete steps are as follows:
Step 1, aluminium alumina ore are calcined at the temperature of 1510 DEG C ~ 1550 DEG C;
Step 2, grog section obtained after a while grind, and obtain-280 orders respectively to+310 order particles, and+280 orders are to-190 order particles, and-90 orders are to+190 object particles;
Step 3 ,-280 orders according to 80% are to+310 order particles, and+280 orders of 14% are to-190 order particles, and-90 orders to+190 object particles of 6% carry out Homogeneous phase mixing;
Step 4, the bauxite mixed to be mixed with silica flour, phenolic resins, white glue with vinyl, calcium bentonite and isopropyl alcohol.
Further, after described step 2 obtains clinker particles, pickling processes is carried out and drying to particle, more dried clinker particles is carried out mixing match according to ratio described in 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 the ratio mixing of 0.3% ~ 0.4%.
Compared with prior art, bauxite in refractory material is carried out distribution according to granular size and arranges by the present invention, after Homogeneous phase mixing, the bauxite grains of different size is staggered, change compactness with this, and then strengthen gas permeability, in existing coating, the bauxite grains of same particle sizes level possesses good permeability, avoid in casting process, the appearance of cold shut phenomenon between liquid metal and coating.Therefore adopt coating provided by the present invention, the casting quality of lost foam casting gained can be improved.
Detailed description of the invention
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
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.Particle size and its distribution due to bauxite is the key factor affecting lost foam casting used coating gas permeability, and can the thermal decomposition product of foam plastics mould in sintering process be discharged smoothly by coating, and the gas permeability of lost foam paint is key point.So the particle size fraction of bauxite is made into different size by the present invention, improve the gas permeability of coating with this.
In the present invention, bauxite by 80%-280 orders to+310 order particles ,+280 orders of 14% are to-190 order particles, and-90 orders of 6% are to+190 object uniform particles mixing compositions.
The coating that the present invention obtains, after brushing bubbles model, coating normal temperature gas permeability is higher than 12cm2 (kPamin)
-1, hot permeability is greater than 22cm
2(kPamin)
-1.
The bauxite formed due to different grain size level proportioning also needs could form coating with other component common combinations.So existing, component each in 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%.
It should be noted that, in the present invention, refractory powder also comprises one or more combinations in fused quartz powder, zirconium English powder, magnesia powder, forsterite powder, brown alundum powder and white alundum powder.In addition, the present invention all adopts water as the carrier of coating.
Present invention also offers a kind of preparation method of coating, concrete steps are as follows:
Step 1, aluminium alumina ore are calcined at the temperature of 1510 DEG C ~ 1550 DEG C;
Step 2, grog section obtained after a while grind, and obtain-280 orders respectively to+310 order particles, and+280 orders are to-190 order particles, and-90 orders are to+190 object particles;
Step 3 ,-280 orders according to 80% are to+310 order particles, and+280 orders of 14% are to-190 order particles, and-90 orders to+190 object particles of 6% carry out Homogeneous phase mixing;
Step 4, the bauxite mixed to be mixed with silica flour, phenolic resins, white glue with vinyl, calcium bentonite and isopropyl alcohol.
Embodiment 2-1
Step 1, aluminium alumina ore are calcined at the temperature of 1510 DEG C ~ 1550 DEG C;
Step 2, grog section obtained after a while grind, and obtain-280 orders respectively to+310 order particles, and+280 orders are to-190 order particles, and-90 orders are to+190 object particles;
Step 3 ,-280 orders according to 80% are to+310 order particles, and+280 orders of 14% are to-190 order particles, and-90 orders to+190 object particles of 6% carry out Homogeneous phase mixing;
Step 4, by 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 the ratio mixing of 0.3% ~ 0.4%.
Al is divided into because bauxitization studies
2o
3, simultaneously also containing Ti0
2, FeO
3deng impurity.Sintering temperature and Ti0
2, FeO
3larger on coating impact Deng impurity content.Meanwhile, also because bauxite is in the process of grinding, milling apparatus mostly is high violent steel casting, is difficult to remove with magnetic separation after being mixed into.So bauxite grains after grinding, also one pickling processes should be carried out, to remove impurity.Obtain after clinker particles until step 2, pickling processes is carried out and drying to particle, then dried clinker particles is carried out mixing match according to ratio described in step 3.
Below be only the preferred embodiment of the present invention, it 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 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 (6)
1. a lost foam casting coating, comprise refractory powder, phenolic resins, white glue with vinyl, calcium bentonite and isopropyl alcohol, refractory powder comprises bauxite and silica flour, it is characterized in that: described bauxite by 80%-280 orders to+310 order particles, + 280 orders of 14% are to-190 order particles, and-90 orders of 6% are to+190 object uniform particles mixing compositions.
2. lost foam casting coating as claimed in claim 1, 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 1, 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 white alundum powder.
4. the preparation method of coating as claimed in claim 1, concrete steps are as follows:
Step 1, aluminium alumina ore are calcined at the temperature of 1510 DEG C ~ 1550 DEG C;
Step 2, ground by the grog that obtains after calcining, obtain-280 orders respectively to+310 order particles ,+280 orders are-190 order particles extremely, and-90 orders are+190 object particles extremely;
Step 3 ,-280 orders according to 80% are to+310 order particles, and+280 orders of 14% are to-190 order particles, and-90 orders to+190 object particles of 6% carry out Homogeneous phase mixing;
Step 4, the bauxite mixed to be mixed with silica flour, phenolic resins, white glue with vinyl, calcium bentonite and isopropyl alcohol.
5. preparation method as claimed in claim 4, is characterized in that: carry out pickling processes and drying to particle after described step 2 obtains clinker particles, more dried clinker particles is carried out mixing match according to ratio described in step 3.
6. preparation method as claimed in claim 4, 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 the ratio mixing of 0.3% ~ 0.4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN103042168A CN103042168A (en) | 2013-04-17 |
| CN103042168B true CN103042168B (en) | 2015-06-03 |
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