Lightweight high stiffness shaft and manufacturing method thereo

Details Lightweight high stiffness shaft and manufacturing method thereo Lightweight high stiffness shaft and manufacturing method thereo

1995-06-07

1998-03-03

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 29, 419 49, B22F 312, B22F 314, B22F 704, B22F 500

Patent

active

057246432

ABSTRACT:
A high performance hybrid shaft for use in applications where high stiffness, high temperature capacity and lightweight are important. In one form of the present invention the hybrid shaft is formed of a titanium alloy outer tube having in it's interior a gamma titanium aluminide alloy powder metal that is metallurgically bonded to the outer tube. The gamma titanium aluminide alloy powder metal has a room temperature modulus of elasticity greater than the modulus of elasticity of the titanium alloy tube. The hybrid shaft has a modulus of elasticity greater than modulus of elasticity of the titanium alloy tube, and a density equivalent to that of the titanium alloy tube. The wear resistant capability of the shaft is increased at local regions by surface modification treatment such as plasma ion nitrating or by affixing at the ends of the tube a hardened steel fitting. Fabrication of the hybrid shaft involves filling the titanium alloy tube with gamma titanium aluminide alloy powder, sealing the ends and than hot isostatically pressing the assembly to densify the powder metal and create a metallurgical bond between two components.

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