Crucibles and compositions and processes for making same
AssigneeMaterion Corporation
InventorsZan Aslett, Fritz Grensing, Evan K. Morey
Life of this patent
Estimating the term…
Abstract
A crucible having a heat treated body. The heat treated body comprises a composition including an oxide material, from 5 wt % to 50 wt % a nitride material, and optionally a sintering aid. A weight ratio of the nitride material to the oxide material ranges from 0.02:1 to 2.0:1. The heat treated body has an oxide material lattice structure with nitride material at least partially encapsulated therein.
Claims20
A crucible having a heat treated body, the heat treated body comprising a composition consisting of:
- greater than 50 wt % aluminum oxide, beryllium oxide, yttrium oxide, or combinations thereof;
- from 5 wt % to less than 50 wt % boron nitride;
- less than 5 wt % co-products of the oxide and the nitride;
- and
- optionally a sintering aid;
- wherein a weight ratio of the nitride to the oxide ranges from 0.02:1 to less than 1.0:1, and wherein the boron nitride is at least partially encapsulated in an oxide lattice structure.
A process for producing a crucible having a heat treated body, the method comprising:
- providing an oxide material, optionally in a powder form;
- providing a nitride material, optionally in a powder form, in an amount from 10 wt % to 50 wt % boron nitride;
- providing a sintering aid;
- mixing the oxide material, the nitride material, and the sintering aid to form a precursor composition;
- wherein a weight ratio of the nitride material to the oxide material in the precursor composition ranges between 0.05:1 and 2.0:1 less than 1.0:1;
- shaping the precursor composition;
- and
- heat treating the shaped composition to form the heat treated body having a composition consisting of:
- from 50 wt % to 90 wt % an oxide selected from aluminum oxide, beryllium oxide, yttrium oxide, or combinations thereof;
- from 10 wt % to 50 wt % boron nitride;
- less than 5 wt % co-products of the oxide and the boron nitride;
- and
- less than 5 wt % of the sintering aid;
- wherein in the heat treated body, the boron nitride material is at least partially encapsulated in an oxide material lattice structure.
A crucible having a heat treated body, the heat treated body having a composition consisting of:
- from 50 wt % to 90 wt % an oxide selected from aluminum oxide, beryllium oxide, yttrium oxide, and combinations thereof;
- from 10 wt % to 50 wt % boron nitride;
- less than 5 wt % co-products of the oxide and the boron nitride;
- and
- less than 5 wt % of a sintering aid.
Dependencies are inferred from the claim text.