Lost foam casting coating and preparation method thereof
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A technology of lost foam casting and coating, which is used in casting molding equipment, coatings, molds, etc., can solve the problems of hindering the gas permeability of refractory materials, restricting the quality of lost foam casting products, etc., to change the density and improve the casting. The effect of quality, good breathability
Inactive Publication Date: 2013-04-17
ANYUE COUNTY JINLONG MACHINERY MFG
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Abstract
Description
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Problems solved by technology
However, the particle size used in the existing refractory materials is uniform and does not form a step distribution design, which hinders the increase in the air permeability of the refractory materials, thereby restricting the improvement of the quality of the products obtained by the lost foam casting.
Method used
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Embodiment 1-1
[0024] Bauxite is 80.1%-83.3%; quartz powder is 9.1%-9.8%; phenolic resin is 2.2%-3.5%; white latex is 1.7%-1.9%; calcium bentonite is 3.1%-4.4%; 0.3% to 0.4%.
Embodiment 1-2
[0026] Bauxite is 81.5%; quartz powder is 9.5%; phenolic resin is 2.8%; white latex is 1.8%; calcium bentonite is 3.5%; isopropanol is 0.35%.
[0027] It should be noted that the refractory powder in the present invention also includes one or more combinations of fused silica powder, zircon powder, magnesia powder, forsterite powder, brown corundum powder and white corundum powder. In addition, the present invention all adopts water as the carrier of coating.
[0028] The present invention also provides a kind of preparation method of coating, concrete steps are as follows:
[0029] Step 1, selecting bauxite ore to be calcined at a temperature of 1510°C to 1550°C;
[0030] Step 2, grinding the clinker obtained later in the section to obtain particles from -280 mesh to -310 mesh, from -280 mesh to -190 mesh, and from 90 mesh to -190 mesh;
[0031] Step 3, according to 80% of -280 mesh to -310 mesh particles, 14% of -280 mesh to -190 mesh particles, 6% of -90 mesh to -190 mesh...
Embodiment 2-1
[0034] Step 1, selecting bauxite ore to be calcined at a temperature of 1510°C to 1550°C;
[0035] Step 2, grinding the clinker obtained later in the section to obtain particles from -280 mesh to -310 mesh, from -280 mesh to -190 mesh, and from 90 mesh to -190 mesh;
[0036] Step 3, according to 80% of -280 mesh to -310 mesh particles, 14% of -280 mesh to -190 mesh particles, 6% of -90 mesh to -190 mesh particles for uniform mixing;
[0037] Step 4, according to the mixed bauxite, bauxite is 80.1% to 83.3%; quartz powder is 9.1% to 9.8%; phenolic resin is 2.2% to 3.5%; white latex is 1.7% to 1.9%; Bentonite is 3.1%-4.4%; isopropanol is mixed in a ratio of 0.3%-0.4%.
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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 [0001] The invention belongs to the technical field of metal casting, and in particular relates to a paint for lost foam casting, and also designs a preparation method of the paint. Background technique [0002] Lost foam is a casting process that can obtain shaped castings better than sand molds. The casting process is roughly as follows: firstly, foam is used as raw material to make a foam model with the same shape as the casting; secondly, paint is applied on the foam model to form a coating and dried; again, the foam model with the coating after drying is filled with molding sand. ;Finally pour into the foam model, and after cooling, shake off the sand to obtain the casting. In the above process, the performance of the paint applied on the foam model is the key to determining whether qualified castings can be obtained. [0003] Traditional casting coatings generally include refractory materials, binders, suspending agents, surfactants, defoamers and car...
Claims
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Application Information
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