Article with brazed end plate within an open body end

Details Article with brazed end plate within an open body end Article with brazed end plate within an open body end

1997-06-23

2000-05-02

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

With fluid passage in working member communicating with...

Discharge solely at periphery normal to rotation axis

416 97R, 416224, 416232, 416233, 416241R, 228193, 228206, 228207, 22826231, F01D 518, F01D 514

Patent

active

060565071

ABSTRACT:
A method for preparing a Ni base superalloy inner wall surface of a body open end, such as an end of a turbomachinery blade, and an end plate, such as a blade tip cap, for brazing together at a rim of the end plate includes electrochemically removing oxides from the inner wall surface. The end plate is prepared, at least at its rim, by first removing surface and subsurface oxides, for example by mechanical abrading or a combination of such abrading and acid cleaning. Then at least the rim is electroplated with Ni which is heated to diffuse the Ni into the rim substrate. This provides an improved combination of surfaces for brazing, for example with a Ni base brazing alloy. After brazing the rim to the inner wall, there is provided an article with an improved relatively low oxide brazed joint, including less than about 20 volume % oxides, and a plate rim of substantially Ni along with elements diffused from the brazing alloy and the rim.

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