Ceramic filter containing carbonaceous material and bonded with silica adhesive and manufacturing method thereof
A technology of silica gel adhesive and carbonaceous material, which is applied to the filter of carbonaceous material and silica gel adhesive. The manufacture of the filter includes the field of refractory materials, which can solve the problem of easy leakage of refractory particle filters, Solve problems such as low flow rate of molten metal and poor refractoriness, and achieve the effects of eliminating the risk of solidification, low scrap rate, and low heat storage
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[0048] During the preparation of the slurry, a high-efficiency mixer can be used to mix the solid and liquid in the slurry.
[0049] The disposable mold is a template of the required shape of the open-pored porous material produced by the method of the present invention. "Disposable" means that the material of the mold is eroded and most of it is burned or volatilized during sintering. The form can be, for example, a three-dimensional lattice of reticulated layers, an extruded open-celled reticulated structure, or a reticulated polymeric foam made of a thermoplastic material. For example the thermoplastic material may be polyurethane resin. More preferred is reticulated polyurethane foam. Reticulated polyurethane foam is suitable for use as disposable molds in molten metal filters.
[0050] It is more suitable to use coating for disposable molds. For example, polyurethane foam can be dipped in slurry or sprayed with slurry, and then passed through a pair of rollers to adjus...
Embodiment 1
[0060] Aluminum oxide powder: 80%
[0061] Anthracite: 10%
[0062] Active silicon powder: 10%
[0063] The above-mentioned materials are all commercially available materials, and the stated ratios are all percentages by weight. Add 2% sodium hexametaphosphate and 20% water to the mixture of alumina powder, anthracite and active silicon powder. Mix the powder and water with a high-efficiency mixer to make a slurry. This slurry is used to coat polyurethane foam. The polyurethane foam coated with the slurry was dried at 150°C. Sintering was then performed at 1100° C. in an oxygen-free atmosphere. The polyurethane foam therein is also a commercially available material.
[0064] The size of the filter made according to this formula is 50×50×15mm, and 50kg of molten steel is filtered at 1650°C. As a result, the filter has withstood the testing conditions and the molten steel has been filtered as required.
[0065] After testing with a flexural tester, the flexural strength o...
Embodiment 2
[0067] Aluminum oxide powder: 60%
[0068] Anthracite: 10%
[0069] Active silicon powder: 30%
[0070] The above-mentioned materials are all commercially available materials, and the stated ratios are all percentages by weight. Add 2% sodium hexametaphosphate and 20% water to the mixture of alumina powder, anthracite and active silicon powder. Mix the powder and water with a high-efficiency mixer to make a slurry. This slurry is used to coat polyurethane foam. The polyurethane foam coated with the slurry was dried at 150°C. Sintering was then performed at 1100° C. in an oxygen-free atmosphere. The polyurethane foam therein is also a commercially available material.
[0071] The size of the filter made according to this formula is 50×50×15mm, and 50kg of molten steel is filtered at 1650°C. As a result, the filter has withstood the testing conditions and the molten steel has been filtered as required.
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