Metal oxide powders and metal oxide-binder components with bimodal particle size distributions, ceramics made therefrom, method of producing bimodal metal oxide powders, method for producing ceramics, and dental ceramic products
AssigneeChemichl AG
InventorsThomas Conrad, Gerhard Meyer
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Abstract
The disclosure relates to metal oxide powders with a bimodal particle size distribution, to ceramics that can be made from these metal oxide powders, especially milling ceramics for use in dental technology, to a method for the production of the metal oxide powders and of the ceramics, to the use of nanoscale metal oxide powders for the production of the metal oxide powders and of the ceramics as well as to dental ceramic products.
Claims32
A bimodal metal oxide powder or bimodal metal oxide-binder composite, comprising
- (a) a first metal oxide powder;
- and
- (b) a second, nanoscale metal oxide powder, wherein
- the first metal oxide powder (a) has a d50 value of 0.2 μm to 12 μm;
- and
- the second, nanoscale metal oxide powder (b) has a d50 value ranging from 10 nm to 300 nm;
- wherein the size ratio, of the d50 values of (a) to (b) lies at a maximum of 40 to 1 and the quantity ratio of (a) to (b) is from 0.1:99.9 to 99.9:0.1.
A ceramic made of metal oxide powder with a bimodal particle size distribution made from a bimodal metal oxide powder comprising
- (a) a first metal oxide powder (a) with a d50 value of 0.2 μm to 12 μm and
- (b) a second, nanoscale metal oxide powder with a d50 value of 10 nm to 300 nm with
- whereby the size ratio of the d50 values of (a) to (b) lies at a maximum of 40 to 1 and the quantity ratio of (a) to (b) is from 0.1:99.9 to 99.9:0.1.
A ceramic made of metal oxide powder with a bimodal particle size distribution, comprising two or more phases, wherein
- (1) a first phase comprises a metal oxide having an average particle size of at least 250 nm;
- and
- (2) a second phase comprises a metal oxide having an average particle size of 25 nm to 250 nm.
Dependencies are inferred from the claim text.