Composite shaped articles

Claim 2

A turbine blade which comprises a plurality of reinforcing cores of a heat resistant, oxide dispersion hardened alloy and a cladding of a heat resistant alloy which is compatible with said core material, said reinforcing cores each being individually wholly encapsulated and bonded to said cladding material wherein the ratio of cross-sectional area of said cores and said cladding area is from 0.05 to 2:1.

Claim 3

The turbine blade of claim 1, wherein the base composition of said cladding material is a nickel superalloy.

Claim 4

The turbine blade of claim 2, wherein said nickel superalloy has the following composition by weight (disregarding constituents present in amounts of less than 0.005%): ______________________________________ C 0.15 to 0.2% Cr 15.7 to 16.3% Co 8.0 to 9.0% Mo 1.5 to 2.0% W 2.4 to 2.8% Ta 1.5 to 2.0% Nb 0.6 to 1.1% Al 3.2 to 3.7% Ti 3.2 to 3.7% B 0.005 to 0.015% Zr 0.05 to 0.15% Ni balance. ______________________________________

Claim 5

The turbine blade of claim 1, wherein the base composition of said cladding material is a cobalt superalloy.

Claim 6

The turbine blade of claim 4, wherein said cobalt superalloy has the following composition, by weight: ______________________________________ C 0.6% Ni 10.0% Cr 23.5% W 7.0% Ta 3.5% Ti 0.2% Zr 0.5% ______________________________________ balance Co, incidental constituents and impurities.

Claim 7

The turbine blade of claim 1, wherein the base composition of said cladding material is an iron-based alloy.

Claim 8

The turbine blade of claim 6, wherein said iron-based alloy has the following composition, by weight: ______________________________________ Cr 15% Ni 26% Mo 1.3% Al 0.2% Ti 2% C 0.05% B 0.015% ______________________________________ balance Fe, incidental constituents and impurities.

Claim 9

An turbine blade according to claim 6, wherein said iron-based alloy has the following composition, by weight: ______________________________________ C 0.17 to 0.23% Si 0.10 to 0.50% Mn 0.3 to 0.8% P up to 0.035% S up to 0.035% Cr 11.0 to 12.5% Ni 0.3 to 0.8% Mo 0.8 to 1.2% V 0.25 to 0.35% W up to 0.6% Nb up to 0.05% Fe balance. ______________________________________

Claim 10

The turbine blade of claim 6, wherein said iron-based alloy has the following composition, by weight: ______________________________________ C y %, where y is from 0.08 to 0.15 Ti 5y to 1% Si up to 0.8% Mn up to 1.0% P up to about 0.01% S up to about 0.01% Cr 15.5 to 18.0% Ni 13.0 to 16.0% Mo up to 0.5% W 2.5 to 4.0% Fe balance. ______________________________________

Claim 11

The turbine blade of claim 1, wherein the base composition of said cores is a nickel alloy, which has dispersed therein at least one oxide selected from the group consisting of the oxides of the elements Y, Ca, La, Be, Th, Ce, and Al.

Claim 12

The turbine blade of claim 14, wherein said oxide comprises from 0.5 to 3% by weight of at least one of yttrium oxide, lanthanum oxide or thorium oxide.

Claim 13

The turbine blade of claim 1, wherein the base composition of said cores is a cobalt alloy, which has dispersed therein at least one oxide selected from the group consisting of the oxides of the elements Y, Ca, La, Be, Th, Ce, and Al.

Claim 14

The turbine blade of claim 12, wherein said oxide comprises from 0.5 to 3% by weight of at least one of yttrium oxide, lanthanum oxide, or thorium oxide.

Claim 15

The turbine blade of claim 1, wherein the base composition of said cores is an iron-based alloy, which has dispersed therein at least one oxide selected from the group consisting of the oxides of the elements Y, Ca, La, Be, Th, Ce, Al, Ti, and Cr.

Claim 16

The turbine blade of claim 14, wherein said iron-based alloy is an iron-chromium alloy having the following composition, by weight: ______________________________________ Cr 13% Mo 2% Ti 3.5% Y.sub.2 O.sub.3 1.5% ______________________________________ balance Fe, incidental constituents and impurities.

Claim 17

The turbine blade of claim 14, wherein said iron-based alloy is an iron-chromium alloy which additionally contains from 0.5 to 5% by weight titanium dioxide (TiO 2 ).

Claim 18

The turbine blade of claim 14, wherein said iron-based alloy is an iron-chromium alloy which additionally contains from 0.5 to 5% by weight chromic oxide (Cr 2 O 3 ).

Claim 19

The turbine blade of claim 14, wherein said iron-based alloy is an iron-nickel-chromium alloy having the following composition, by weight: ______________________________________ Cr 17% Ni 13% Mo 0.5% W 3% Y.sub.2 O.sub.3 1.5% ______________________________________ balance Fe, incidental constituents and impurities.

Claim 20

The turbine blade of claim 1, wherein the base composition of said cores is a tungsten alloy, which has dispersed therein at least one oxide selected from the group consisting of the oxides of the elements Y, La, and Th.

Claim 21

The turbine blade of claim 1, wherein the base composition of said cores is a molybdenum alloy, which has dispersed therein at least one oxide selected from the group consisting of the oxides of the elements La, Y, and Th.

Claim 22

The turbine blade of claim 1, wherein the base composition of said cores is the same as the base composition of said cladding material; and wherein the composition of said cores differ from the composition of said cladding material only in that said base composition of said cores has dispersed therein at least one oxide selected from the group consisting of the oxides of the elements Y, Ca, La, Be, Th, Ce, Al, Ti, and Zr.

Claim 23

The turbine blade of claim 21, wherein the total amount of said dispersed oxides is no more than 10% by weight.