The pressing method in ceramics refers to the process of applying pressure to granular or powdery materials to form a solid body with a defined shape. This is done through various techniques such as hot pressing, isostatic pressing, and dry press molding.
Hot pressing is the most commonly used technique in ceramics. It involves applying temperature and pressure simultaneously to the powder compact contained in a die. This process helps in achieving dense, non-oxide monolithic ceramics and their composites.
Isostatic pressing is another method used in ceramics. It applies a uniform, equal force over the entire product, regardless of its shape or size. This technique can be further divided into cold isostatic pressing and hot isostatic pressing. Cold isostatic pressing involves encapsulating the pre-pressed blank in a flexible rubber or plastic mold, and then applying high-pressure liquid to mold the blank. This ensures a uniform density of the blank. On the other hand, hot isostatic pressing is used for consolidation of powders or defect healing of castings. It is applied to a range of materials, including ceramics, metals, composites, plastics, and carbon.
The pressing process is followed by post-processing steps such as sintering, which involves firing the green body at high temperatures to increase its density and strength. If high dimensional accuracy is required, the workpiece may undergo post-treatment in a sizing press, where it is compressed again with axially generated pressure to achieve precise position and shape tolerances.
Overall, the pressing method in ceramics involves applying pressure to granular or powdery materials to shape them into solid bodies. It is a crucial step in the manufacturing of various ceramic products and can be done through techniques like hot pressing and isostatic pressing.
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