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US 5,326,519 AGranted
Process of preparing zirconium oxide-containing ceramic formed bodies
OwnerNils Clausseninventor
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OwnerNils Clausseninventor
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The present invention provides a zirconium oxide-containing ceramic formed body, wherein it is also free from amorphous phases on the grain boundaries and triple points, displays a shrinkage of less than 5% in comparison with its green body and is obtainable by reaction sintering of a green body, said ceramic formed body being formed from a mechanically alloyed mixture which contains or consists of at least 1% by volume zirconium metal powder and at least 20% by volume of one or more metallic powders selected from the elements magnesium, aluminum, copper, selenium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc, strontium, yttrium, niobium, cerium, hafnium and tantalum, as well as the oxides thereof and zirconium oxide, sodium oxide, potassium oxide and lithium oxide. The present invention also provides a process for the production of this ceramic formed body which can be used as a construction element in machines and apparatus, in electronics as a functional element and as a solid body electrolyte.
Process for the production of a zirconium oxide-containing ceramic formed body, said body being free from amorphous phases on the grain boundaries and triple points and displaying a shrinkage of less than 8% in comparison with its green body comprising producing a finely-divided, mechanically alloyed powder mixture of at least 1% by volume zirconium metal powder and at least 20% by volume of one or more metallic powder selected from the group consisting of the elements magnesium, aluminum, copper, selenium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc, strontium, yttrium, biobium, cerium, hafnium and tantalum, as well as the oxides thereof and zirconium oxide, sodium oxide, potassium oxide and lithium oxide, pressing said mixture to give a green body and sintering said green body in an oxygen-containing atmosphere.
Process according to claim 9, wherein the powder-metallurgical forming is carried out by form pressing, isostatic pressing, slip casting, tape casting or injection moulding.
Dependencies are inferred from the claim text.