Powdered metal component
AssigneePlansee SE
InventorsMichael O'Sullivan, Lorenz Sigl, Marco Brandner, Andreas Venskutonis, Wolfgang Kraussler
Life of this patent
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Abstract
A powder metallurgical component has a chromium content of at least 80% by weight and pores and/or oxide inclusions which are present in the component. The number per unit area of a sum of pores and oxide inclusions at a cut surface through the component in at least one region is at least 10,000 per mm2.
Claims18
A powder metallurgical component, comprising:
- a chromium content of at least 80% by weight;
- at least one of pores or oxide inclusions present in the component;
- said oxide inclusions having a chromium oxide content of at least 90 mol. %;
- a sum of said pores and said oxide inclusions at a cut surface through the component in at least one region amounting to a number per unit area of at least 10,000 per mm2;
- and
- said region having an Al2O3 content of <500 μg per 1 g of the component.
A process for producing a powder metallurgical component having a chromium content of at least 80% by weight, at least one of pores or oxide inclusions present in the component, and a sum of the pores and the oxide inclusions at a cut surface through the component in at least one region amounting to a number per unit area of at least 10,000 per mm2, the process comprising the following steps:
- (i) providing a powder batch including chromium and optionally other metals, the chromium having a content of at least 80% by weight, based on a total metal content, and the powder batch including powder having a BET surface area of ≥0.05 m2/g;
- (ii) pressing the powder batch to form a compact;
- (iv) sintering the compact at from 1100 to 1500° C.;
- (v) oxidizing the sintered component in a presence of an oxygen source;
- and
- (vi) removing the oxide layer from the surface;
- (vii) providing the oxide inclusions with a chromium oxide content of at least 90 mol. %;
- and
- (viii) providing the region with an Al2O3 content of <500 μg per 1 g of the component.
Dependencies are inferred from the claim text.