Oxide-dispersion-strengthened niobum-based alloys and process for preparing
AssigneeDaido Tokushuko Kabushiki Kaisha
InventorsKenji Tsukuta, Tomohito Iikubo
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Abstract
Improvement of Nb-alloys, which are known as heat-resistant alloys, by giving anti-oxidation property thereto and increasing the high temperature strength thereof. In addition to a determined amount of Al, one of (1) suitable amounts of Ti, Cr and V, and (2) suitable amounts of Cr and Co, are added to Nb-matrix, and a high melting temperature metal oxide such as Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 is dispersed in the matrix. Preferable method of preparing the alloys is combination of mechanical alloying and subsequent hot processing.
Claims6
An oxide-dispersion-strengthened niobium-based alloy with good oxidation resistance and heat resistance, which consists essentially of Al:
- 12-35 wt. %, Ti:
- 7-28 wt. %, Cr:
- 2-10 wt. % and V:
- 2-10 wt. %, and the balance of Nb, in which 0.1-2 wt. % of a high melting point metal oxide is dispersed.
A process for preparing an oxide-dispersion-strengthened niobium-based alloy with good oxidation resistance and heat resistance, comprising mixing 0.1-2 wt. % of a high melting point metal oxide to an alloy consisting essentially of Al:
- 12-35 wt. %, Ti:
- 7-28 wt. %, Cr:
- 2-10 wt. % and V:
- 2-10 wt. %, and the balance of Nb, or a mixture of metals giving the above alloy composition;
- treating the obtained mixture by mechanical alloying method to produce the alloy powder;
- and hot processing the produced alloy powder to a part of the desired shape.
An oxide-dispersion-strengthened niobium-based alloy, which consists essentially of Al:
- 10-35 wt. % Cr:
- 15-35 wt. % and Co:
- 10-25 wt. % and the balance of Nb, in which a high melting point metal oxide in an amount of 0.1 to 2 wt. % is dispersed.
A process for preparing an oxide-dispersion-strengthened niobium-based alloy with good oxidation resistance and heat resistance, comprising mixing 0.1-2 wt. % of a high melting point metal oxide to an alloy consisting essentially of Al:
- 10-35 wt. %, Cr:
- 15-35 wt. % and Co:
- 10-25 wt. %, and the balance of Nb, or a mixture of metals giving the above alloy composition;
- treating the obtained mixture by mechanical alloying method to produce the alloy powder;
- and hot processing the produced alloy powder to a part of the desired shape.
Dependencies are inferred from the claim text.