Reaction-formed moulded ceramic body containing mullite, its production and its use
OwnerNils Clausseninventor
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Abstract
A reaction-formed moulded ceramic body containing mullite is described which is obtainable by heat treating a body moulded from a finely dispersed powder mixture of aluminium, Al.sub.2 O.sub.3 and a material containing Si in an atmosphere containing oxygen. Due to their properties, in particular their low shrinkage of 0 to 4% on average, the moulded bodies are very well suited for use as wear-resistant and/or high temperature-resistant components in the construction of machines, apparatuses and motors, as a cutting tool, as a component for bearings and/or seals and as a functional part in electronic instruments.
Claims31
Reaction-formed molded ceramic body having a mullite matrix that is virtually free of intergranular phases, comprising
- (a) from 20-100 vol. % mullite and from 0 to 80 vol. % of at least one oxide selected from the group consisting of Al.sub.2 O.sub.3, ZrO.sub.3, zircon, cordierite and MgAl.sub.2 O.sub.4, wherein said mullite is formed by heat treating, in an oxygen containing atmosphere, a green body moulded from a finely dispersed powder mixture of aluminum, Al.sub.2 O.sub.3, and a material containing Si.
Process for producing a reaction-formed, moulded ceramic body having a mullite matrix that is virtually free of intergranular phases and contains 20-100 volume % mullite and 0 to 80 volume % of at least one oxide selected from the group consisting of Al.sub.2 O.sub.3, ZrO.sub.3, zircon, cordierite and MgAl.sub.2 O.sub.4, comprising:
- heat treating, in an oxygen containing atmosphere, a green body moulded from a finely dispersed powder mixture of aluminum, Al.sub.2 O.sub.3, a material containing Si, and at least one oxide selected from the group consisting of Al.sub.2 O.sub.3, ZrO.sub.3, zircon, cordierite and MgAl.sub.2 O.sub.4 to form said moulded ceramic body.
Dependencies are inferred from the claim text.