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            Horizontal Sand Mill

            Horizontal Sand Mill

            Micron And Nano Size Wet Grinding

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            Summary of Application Research of Bead Mill in the Field of Special Ceramics

            • Summary of Application Research of Bead Mill in the Field of Special Ceramics

            • In the preparation process of special ceramics, wet grinding is a more effective method to obtain nano-ceramic powders. It not only avoids the high cost of preparing nano-powders by chemical methods, but also achieves energy saving and emission reduction, and also avoids some traditional methods. The fineness of mechanical grinding is difficult to reach the deficiency of nanometer powder.
            Detailed description

            In the preparation process of special ceramics, wet grinding is a more effective method to obtain nano-ceramic powders. It not only avoids the high cost of preparing nano-powders by chemical methods, but also achieves energy saving and emission reduction, and also avoids some traditional methods. The fineness of mechanical grinding is difficult to reach the deficiency of nanometer powder.

            01 Application in the preparation of alumina ceramics

            In the "Preparation and Characterization of Alumina Microcrystalline Ceramic Particles with Different Microstructures", the researchers concluded that the sand milling process can significantly promote the dispersion of γ-AlOOH sol colloidal particles. With the increase of sanding times, the particle size distribution becomes narrower and smaller, and the particle size gradually becomes smaller; after sanding 5 times, the sol colloid particles d(0.1)=1.225μm, d(0.5)=1.841μm, d(0.9 )=2.698μm. The microstructure of the alumina microcrystalline ceramic particles prepared by the sand-milled sol is more uniform, and the crystal grain size is significantly smaller. The microhardness value is higher, the hardness value distribution is more uniform, the deviation is smaller, and the average value is 22GPa.

            02 Application in the preparation of zirconia ceramics

            In order to study the effect of different grinding equipment and grinding process parameters on the depolymerization of powder agglomerates, the researchers took zirconia powder with d50=1.355μm as the research object and studied the influence of grinding equipment and process parameters on the particle size of zirconia slurry . Firstly, use vertical ball mill, vertical bead mill and horizontal sand mill as the grinding equipment, use Φ2mm zirconia ball as the grinding medium, and use m medium: m material = 5:1 after grinding for 15 hours. , Detect the particle size of zirconia slurry after grinding. The results show that the horizontal sand mill has the best grinding effect, and the d50 of the zirconium oxide slurry after grinding is 0.303μm.

            03 Application in the preparation of boron carbide ceramics

            Boron carbide (B4C) is an important superhard material, and B4C ceramic is a high-performance engineering ceramic material. The use of submicron ultrafine powder raw materials is the key to the good performance of boron carbide ceramics. The researchers used the sand milling process to prepare sub-micron B4C ultrafine powder, and investigated the process parameters such as the ball-to-battery ratio, the material-to-water ratio, and the amount of dispersant in the sand milling process, and successfully prepared a median particle size D50 of less than 0.6μm. Boron carbide ultrafine powder is used to prepare high-density pressureless sintered boron carbide ceramics.

            04 Application in the preparation of barium titanate ceramics

            In the process of preparing ultrafine barium carbonate, the intermediate of barium titanate powder, the researchers reduced the content of impurities by filtering the raw materials and removing iron; by using the self-made A reagent and microwave drying, the specific surface area of the product was significantly increased , And then obtain the ultrafine barium carbonate powder with small particle size, narrow distribution and large specific surface area through proper sanding process.

            05 Application in the preparation of barium zirconate ceramics

            The researchers compared solid-phase powder ball milling for 20 hours with sand milling for 1 hour. A laser particle size analyzer was used to measure the particle size of the processed powder. As shown in the figure below, the particle size and dispersibility of the powder have not been significantly improved after ball milling. This is because the solid-phase synthesized barium zirconate powder forms hard agglomerations under the action of high temperature, and ordinary ball milling pretreatment cannot open this Class reunion phenomenon. However, after the powder is pretreated by sand milling, the dispersibility is significantly improved. The secondary particle peaks formed by hard agglomeration of about 10 μm disappear completely, leaving only the primary particle peaks of about 1 μm, and even some particles are broken and appear A new particle size distribution peak around 0.2μm. The sand-milled powder has a small particle size, high sintering activity and easier sintering.

            06 Application in the preparation of lithium niobium titanium ceramics

            The researchers used X-ray diffraction, scanning electron microscopy and other analytical methods combined with the dielectric performance test results to explore the effect of different ball milling methods (ordinary ball milling and sand milling) on Li1.0Nb0.6Ti0.5O3(LNT) lithium niobium titanium ceramics. Sintering behavior, microstructure and microwave dielectric properties. The powder was crushed by sand milling to obtain a powder with uniform particle size distribution and good dispersibility, which reduced the sintering temperature of LNT ceramics to a certain extent. In addition, the density, relative permittivity (εr) and product of the mechanical quality factor and resonance frequency (Q×f) of the ceramic samples obtained by sintering the powder sintered by sand milling are higher than those prepared by ordinary ball milling. The results show that the ceramic sintered at 1050℃ has relatively excellent microwave dielectric properties, εr=69.9, Q×f=5887GHz, and the temperature coefficient of resonance frequency τf=28.3×10-6/℃.


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