30-60 Mesh High-alumina Casting Sands With Low Thermal Expansion Coefficient Precision Investment
1. Description:
a. Our products are made of mullite or kaolin raw ore.
b. The density of mullite, the raw material of casting sand, is usually greater than 2.5g / m3, the true specific gravity is 2.6g / cm3, the water content is less than 0.03%, and the fire resistance is greater than 1750 ° C.
c. The weight of mullite will be reduced by 0.3% to not more than 0.4% under the condition of high temperature combustion, which indicates that the chemical properties of mullite are stable.Its pH is between 7 and 9, and the hardness of the shell is greater than 8 MPa.The alumina content in the foundry sand is between 42% and 46%, and the silica content is between 51% and 53%.All above make our high-alumina precision investment casting sand keep low thermal expansiion coefficient and make the shell keep good shape.
d. The grain size and application of mullite for casting sand are different. Mullite is made from kaolin by high temperature sintering. The chemical composition of mullite is a chemical substance with strong fire resistance, and its performance is relatively stable.
e. To make the shell,in the back layer slurry, 200 mesh mullite and silica sol are needed, and 30-60 mesh mullite is added to the slurry.
2. Technical Indicators
| The physical and chemical indications |
| Grade | Fe₂O₃ % Max | Al2O3 % min | SiO₂ % min | TiO2 % max | B.D.g/ccm min | refractoriness |
| Ⅰ-Ⅲ | 1.2-2.3 | 43-46 | 50.5-52.5 | 0.7-1.0 | 2.5-2.55 | 1750
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3. Product Application:
Investment casting sand is mainly used for investment casting, especially reinforcement, gypsum-filled V-shaped molding and vacuum casting, and refractory materials for large, medium and small steel castings, widely used in machinery, aviation, weapons, metallurgy, petroleum And other industries.
For different purposes, the grain size of mullite is also different, and the types of precision investment casting sand are also different. Generally, we use "mesh number" to measure the particle size of mullite, including 8 to 16 mesh, 16 to 30 mesh, 30 to 60 mesh, 60 to 80 mesh, 80 to 120 mesh; mullite powder mainly includes 200 mesh and 300 mesh.
In the field of investment casting, you can refer to the following to meke the shell:
To prepare zirconium powder, 325 mesh mullite powder and silica sol are required, and then 120 mesh zircon sand is added.
In order to prepare the back layer slurry, 200 mesh mullite and silica sol are required, and 30-60 mesh mullite is added to the slurry.
The reinforcing layer is made of the same raw material as the back layer slurry, but requires 16-30 mesh mullite.
For sealing paste, you only need to use 200 mesh mullite powder and silica sol.
Please choose the right product for your purpose.
More Products Pictures
1. 30-60Mesh Grade Ⅰ
| The physical and chemical indications |
| Grade | Fe₂O₃ % Max | Al2O3 % min | SiO₂ % min | TiO2 % max | B.D.g/ccm min | refractoriness |
| Ⅰ | 1.2 | 46 | 50.5 | 0.7 | 2.55 | 1750 |
2. 30-60Mesh Grade Ⅱ
| The physical and chemical indications |
| Grade | Fe₂O₃ % Max | Al2O3 % min | SiO₂ % min | TiO2 % max | B.D.g/ccm min | refractoriness |
| Ⅱ | 1.5 | 44 | 51.5 | 0.9 | 2.53 | 1750 |
3. 30-60 Mesh Grade Ⅲ
| The physical and chemical indications |
| Grade | Fe₂O₃ % Max | Al2O3 % min | SiO₂ % min | TiO2 % max | B.D.g/ccm min | refractoriness |
| Ⅲ | 2.3 | 43 | 52.5 | 1 | 2.5 | 1750 |
Product Tags:
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Refractory High Alumina Casting Sand 30 - 60 Mesh With Granular / Powder Appearance Images
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