Influence of mud content on casting quality
If the mud content of casting Fused Ceramic sand exceeds the standard, the fire resistance and burning point of Fused Ceramic sand will be reduced, and the permeability of mold (core) sand will be reduced. Especially for resin sand, high mud content will greatly reduce the strength of mold (core) sand, increase the amount of resin binder, and the gas evolution of resin sand will also increase accordingly. However, strength, air permeability and gas evolution all seriously affect the quality of castings.
Influence of average fineness and particle size composition on casting quality
The average fineness and particle size composition of Fused Ceramic sand are important parameters related to the surface roughness of castings. Generally speaking, the finer the sand, the smoother the casting surface, and the greater the demand for binder, the greater the gas generation, which is common to all casting sands. Coarse sand with small average fineness value can be selected for castings with large quality or thick section; Fine sand with high average fineness value can be selected for castings with small quality or thin wall.
When selecting the particle size of Fused Ceramic sand, remember to copy the indicators of quartz sand in the past. The general experience is that when the particle size range of Fused Ceramic sand is wider, the comprehensive effect of using Fused Ceramic sand is better, and the particle size finer than that of quartz sand can be used. It is better to determine on the basis of test.
Summary of overall conclusions on the use of Fused Ceramic sand
1) The particle shape of Fused Ceramic sand is nearly spherical, and the amount of binder is less, which reduces the casting defects caused by binder. It has high fire resistance, high strength and good recycling performance, which reduces the production cost of enterprises.
2) Fused Ceramic sand is a kind of non-silica artificial sand, which belongs to neutral material and is suitable for the production of various metal castings. Both acid binder and alkaline binder can be used for the production of castings with different materials. Enterprises can save the cost of sand replacement.
3) The Al2O3 content determines the cost of Fused Ceramic sand. Therefore, casting enterprises should select the appropriate Fused Ceramic sand (Al2O3 content, particle size, etc.) according to the material and size of the castings, so that enterprises can also save a lot of costs.