Fused ceramic sand is an alumina-based ceramic bead for foundry. It obtains extraordinary characteristics such as high thermal resistance, low angularity, high mechanical strength, etc.
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As synthetic foundry sand from calcined bauxite material, fused ceramic sand quality is stable from a strict production and quality control system. However, it should be cautious to get proper quality and specification because the quality varies with different manufacturers and different casting technology.
Here are some tips to get proper ceramic sand for the casting work&#;
For castings of steel and stainless steel, use high Al2O3 content ceramic sand. High Al2O3 up to 73-75% is the top quality level of fused ceramic sand. In this case, the casting temperature can reach - degrees. Higher aluminum oxide makes higher refractoriness.
For castings of nodular cast iron and non-ferrous alloy, using ordinary Al2O3 content quality level is ok. The casting temperature of the two castings is - degrees and 700-740 degrees respectively. A medium-quality level works perfectly enough. Moreover, the cost is more acceptable.
Generally, bigger and heavier castings ask for coarser ceramic sand. For heavy large and thick wall casting more than 10MT, use coarse sand such as AFS20 AFS30. Ceramic sand can make corners of large casting more smooth. For light casting and thin structure casting lower than 5MT, always use finer grit such as AFS50, AFS55, AFS60, AFS65, etc.
1. What is ceramic sand?
ceramic sand is mainly made of minerals containing Al2O3 and SiO2 and added with other mineral materials. A spherical foundry sand made by powder, pelletizing, sintering and grading processes. Its main crystal structure is Mullite and Corundum, with rounded grain shape, high refractoriness, good thermochemical stability, low thermal expansion, impact and abrasion resistance&#;features of strong fragmentation. Ceramic sand can be used to produce high quality castings by any kinds of sand casting processes.
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2. Application area of ceramic sand
Ceramic sand has been popularly used in foundries of most kinds of foundry technologies, such as resin coated sand, self-harden process (F NB, APNB and Pep-set), cold box, hot box, 3D printing sand, and lost foam process.
3. The specification of ceramic sand
SND can provide ceramic sand of various specifications. For chemical composition, there are high aluminum-oxide, medium aluminum-oxide sands and lower aluminum-oxide sands, which use against different castings material. All have a widely ranged particle size distribution to satisfy customer&#;s demands.
4. The properties of ceramic sand
5. Particle size distribution
Mesh
20 30 40 50 70 100 140 200 270 Pan AFS Rangeμm
850 600 425 300 212 150 106 75 53 Pan #400 &#;5 15-35 35-65 10-25 &#;8 &#;2 40±5 #500 &#;5 0-15 25-40 25-45 10-20 &#;10 &#;5 50±5 #550 &#;10 20-40 25-45 15-35 &#;10 &#;5 55±5 #650 &#;10 10-30 30-50 15-35 0-20 &#;5 &#;2 65±5 #750 &#;10 5-30 25-50 20-40 &#;10 &#;5 &#;2 75±5 #850 &#;5 10-30 25-50 10-25 &#;20 &#;5 &#;2 85±5 #950 &#;2 10-25 10-25 35-60 10-25 &#;10 &#;2 95±56. The kinds of foundry sands
There are two kinds of foundry sand popularly used, natural and artificial.
The commonly used foundry sands are silica sand, chromite sand, olivine, zircon&#;ceramic sand and cerabeads. The ceramic sand and cerabeads are artificial sand, others are nature sand.
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Post time: Mar-27-