How to Choose Ceramic Foam Filters - alalloycasting

The ceramic foam filter can improve the cleanliness of the melton aluminum. AdTech alumina ceramic foam filter can effectively eliminate large inclusions in the molten aluminum, as well as small inclusions of a few microns. The choice of the filter plate is a technical task. And how to choose the ceramic foam filters? You can consider the following factors.

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How to Choose Ceramic Foam Filters

Firstly, the final quality requirements of the casting determines the choice of foam ceramic filter.

• There are many impurities, and the quality of the cast products is average. Select a foam ceramic filter plate with a larger mesh opening, and add a glass fiber cloth coarse filter in front of the filter plate. The glass cloth can intercept the flow slag by the flow groove, so as to prevent the filter plate from being blocked.
• The quality requirements of the cast products are high, and it needs to choose the foam ceramic filters with small mesh openings.
• The selection of filter plate specifications is based on the flow rate of the melt and the total throughput. If the flow rate is large, the total throughput is large, the filter plate has small holes, it needs to choose the larger size.

Secondly, The ceramic filter plate should consider its color and features.

• The color is pure and free of impurities, which means that the material is uniform. If the hand is not sticky, it means that the surface is not sprayed with adhesive, which will not cause secondary pollution.
• Hold the filter plate with one hand and tap the filter plate with the other hand. The slag keeps dropping, indicating that the quality of the filter plate is poor.
• Burn the filter plate red, then immediately cool it at room temperature. There is no cracking and slag inclusion, indicating that the filter plate is good.

Thirdly, when purchasing alumina ceramic foam filter, carefully evaluate the effective specific surface area or porosity of the foam.

You can observe that the mesh on the surface layer of the filter plate is in a homogeneous state. Calculate the porosity by the drainage method. The three-dimensional mesh is homogeneous and the porosity is relatively large, which is an excellent foam ceramic filter plate.

1 Correct use of ceramic foam filters

&#;Filter metal liquid flows in on the surface, the sprue is designed as an open system. Effective use of filter area;

&#;The alumina ceramic foam filter has a suitable gap. When placed, the filter can prevent it from contacting the side of the sand mold.

Rub sand and press sand in boxes to prevent falling and scattered sand from being brought into the mold;

&#; A support width of &#;5mm should be left on the outflow surface of the filter metal liquid, which can effectively support the pouring pressure during pouring.

2 The effect of correct application of ceramic foam filter:

&#; Effectively filter impurities and improve the purity of the liquid metal;

&#; Reduce turbulent air entrainment, make the molten metal fill smoothly, and the casting structure be evenly distributed;

&#; Reduce casting defects, improve surface quality and yield, facilitate cutting processing, and reduce manufacturing costs.

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3 incorrect application of foam ceramic filter

* Case 1 :

The molten metal inflow surface of the filter and the sprue are not designed as an open system. The filter failed to achieve optimal effective use of the filtration area. Instead, the impact and static pressure of the metal liquid on the foam ceramic filter increased, making it easy for the filter to break.

The consequences of incorrect application of foam ceramic filters when the gating system is not designed to be open:

&#;The filter area becomes smaller, which affects the flow rate of molten metal;

&#;During pouring, the filter is subject to the greatest impact and static pressure of the molten metal, which can easily cause the filter to break;

&#;The filtration area of the filter is not effectively utilized, resulting in wasted process

Filter cost.

* Case 2:

The upper profile of the filter is designed with a 0mm gap. When the filter thickness gauge

When the upper limit of inch fluctuation is reached, the sand mold, sprue and filter seat will be crushed when closing the box.

Detachment is easy to occur.

The filter upper profile is designed with a 0mm gap. The consequences of applying a foam ceramic filter are:

&#; When the upper/lower mold is closed, extrusion will occur, destroying the sand mold, causing scattered sand particles to fall on the surface of the filter, clogging the filter mesh, affecting the flow rate of the molten metal, and causing fine sand particle.

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