TiAl alloy impeller
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorsTatsuya Shimizu, Masahiro Aono
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Abstract
A TiAl alloy impeller is composed of a TiAl alloy and is mountable on a vehicle turbocharger. The TiAl alloy has a lamellar structure in which an α2 layer containing Ti3Al and a γ layer containing TiAl are alternately stacked. The TiAl alloy impeller includes a shaft portion and blades, each of the blades includes an outer edge, and a region of each of the blades including the outer edge has a processed surface. The processed surface is provided with one or more grooves. At least one of the grooves satisfies a relation of Dg>2×Rg or Dg>Wg, where Dg represents a depth of the groove and Rg represents a curvature radius of the groove at a bottom surface of the groove or Wg represents a width of the groove. Thus, a TiAl alloy impeller having high performance as an impeller is provided.
Claims9
A TiAl alloy impeller composed of a TiAl alloy and mountable on a vehicle turbocharger, wherein
- the TiAl alloy has a lamellar structure in which an α2 layer containing Ti3Al and a γ layer containing TiAl are alternately stacked and contains a Si-based compound,
- the Si based compound is contained in the γ layer,
- the TiAl alloy impeller comprising a shaft portion and a plurality of blades connected to the shaft portion, wherein
- each of the plurality of blades includes an outer edge that is an edge on an outer side in a radial direction of the shaft portion,
- a region of each of the plurality of blades including the outer edge has a processed surface,
- the processed surface is provided with one or more grooves,
- at least one of the one or more grooves includes a γ layer groove portion that is an end surface of the γ layer and a Si-based groove portion that is an end surface of the Si-based compound,
- at least one of the one or more grooves satisfies a relation of Dg>2×Rg or Dg>Wg, where Dg represents a depth of the at least one of the one or more grooves and Rg represents a curvature radius of the groove at a bottom surface of the at least one of the one or more grooves or Wg represents a width of the at least one of the one or more grooves, and
- for each groove including the γ layer groove portion and the Si-based groove portion, a relation of Dg1<Dg2 is satisfied, where Dg1 represents a depth of the γ layer groove portion and Dg2 represents a depth of the Si-based groove portion.
A TiAl alloy impeller composed of a TiAl alloy and mountable on a vehicle turbocharger, wherein
- the TiAl alloy has a lamellar structure in which an α2 layer containing Ti3Al and a γ layer containing TiAl are alternately stacked and contains a Si based compound,
- the Si based compound is contained in the γ layer,
- the TiAl alloy impeller comprising a shaft portion and a plurality of blades connected to the shaft portion, wherein
- each of the plurality of blades includes an outer edge that is an edge on an outer side in a radial direction of the shaft portion,
- a region of each of the plurality of blades including the outer edge has a processed surface,
- the processed surface is provided with one or more holes and one or more grooves,
- at least one of the one or more holes satisfies a relation of Dh≤2×Rh and Whs<Wh, where Dh represents a depth of the at least one of the one or more holes, Rh represents a curvature radius of the at least one of the one or more holes, at a bottom surface of the at least one of the one or more holes, Whs represents a processed-surface diameter that is a diameter of the at least one of the one or more holes in the processed surface and Wh represents a diameter of the at least one of the one or more holes defined as 2×Rh
- at least one of the one or more grooves includes a γ layer groove portion that is an end surface of the γ layer and a Si-based groove portion that is an end surface of the Si-based compound,
- at least one of the one or more grooves satisfies a relation of Dg>2×Rg or Dg>Wg, where Dg represents a depth of the at least one of the one or more grooves and Rg represents a curvature radius of the groove at a bottom surface of the at least one of the one or more grooves or Wg represents a width of the at least one of the one or more grooves, and
- for each groove including the γ layer groove portion and the Si-based groove portion, a relation of Dg1<Dg2 is satisfied, where Dg1 represents a depth of the γ layer groove portion and Dg2 represents a depth of the Si-based groove portion.
Dependencies are inferred from the claim text.