The forming methods for alumina ceramic products include dry stamping, slurry injection, stamping, cold isostatic pressing, injection, casting, hot pressing, hot isostatic pressing, and other methods. In recent years, pressure filter forming, direct solidification injection molding, gel injection molding, centrifugal injection molding, and solid free forming have been developed. Products require different forming methods according to their shape, size, complex shape, and precision.
What are the most commonly used forming technologies for alumina ceramics?
There are many ways to form alumina ceramics, such as extrusion, injection, dry stamping, hot pressing, and other forming methods. In recent years, many new forming technologies have been developed at home and abroad. Here are two of the most commonly used forming technologies according to the shape and size of the product.
Slurry injection molding: This is the first forming technology for alumina ceramics, which is suitable for relatively cheap, complex-shaped, and large-sized workpieces. The alumina slurry of this forming method usually uses water as the medium to add adhesives and anti-flocculating agents, and is exhausted after grinding and finally introduced into the gypsum mold. For hollow slurry, when the mold wall absorbs a sufficient thickness of slurry, it is necessary to discharge the excess slurry to reduce the shrinkage of the blank, so a slurry with the highest possible concentration is selected.
Dry pressing method: This forming technology has a simple shape and is limited to workpieces with an internal thickness of more than 1mm and a diameter and length ratio of less than 4:1. The method is divided into two types: uniaxial direction and biaxial direction. The press is divided into a mechanical chamber press and a hydraulic press, and there are fully automatic and semi-automatic forming methods. The maximum pressure of the press is 200MPa, and about 15-50 workpieces can be produced per minute. The stroke pressure distribution of the hydraulic press is averaged, so when the filling powder is different, the height of the pressed workpiece will be different. On the contrary, the mechanical press will apply how much pressure according to the amount of filling powder? This will shrink in size after sintering, which is easy to affect the product quality. Therefore, the uneven distribution of powder during dry stamping is particularly important for filling and has a great impact on the precise control of the size of the manufactured alumina ceramic parts.
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