Method for the production of a ceramic moulding
AssigneeHutschenreuther AG
InventorsKlaus Strobel, Karl Schwarzmeier
Life of this patent
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Abstract
According to one example of embodiment of the invention a ceramic pre-moulding 81 of stable form is pressed from ceramic composition in powder form in a first isostatic pressing action, at least a part of its surface being formed in contact with rigid shaping surfaces 42. The pre-moulding 81 thus obtained is then--possibly after glazing-subjected to a higher pressure, in a further pressing operation on all sides and then fired in a ONCE-ONLY quick-firing method.
Claims34
A method for making a ceramic product, comprising shaping a ceramic moulding composition into a moulding of stable form and firing of the moulding, wherein shaping comprises:
- a first shaping operation in which the moulding composition is shaped to a pre-moulding of stable form geometrically similar to the moulding, performed in a mould cavity comprising a substantially rigid shaping surface and while the moulding composition is in shaping contact with the substantially rigid shaping surface;
- and
- a second shaping operation in which the pre-moulding is reduced in volume and reshaped into the moulding while enclosed by a protective skin system, performed by pressing with a pressing fluid acting on all sides of the pre-moulding and as the enclosed pre-moulding is substantially out of contact with the substantially rigid shaping surface, the protective skin system having such thickness and flexibility as to have substantially no influence on the reshaping;
- the protective skin system being formed by first and second diaphragms, each having a side remote from the moulding composition, and the second shaping operation comprising subjecting the diaphragms to fluid pressure on the respective sides remote from the pre-moulding.
Dependencies are inferred from the claim text.