Joint construction of cobalt-based alloy

Details Joint construction of cobalt-based alloy Joint construction of cobalt-based alloy

2005-05-03

2005-05-03

Keasel, Eric (Department: 3754)

Valves and valve actuation

Valve

Materials

C137S375000, C428S668000

Reexamination Certificate

active

06886809

ABSTRACT:
In the joint construction of cobalt-based alloy, a cobalt-based alloy layer1, in which granular or massive eutectic carbide2disperses, is joined to a metal of a base metal37via an insert metal layer36. For the joint construction of cobalt-based alloy, liquid phase diffusion bonding is performed at a temperature of 1100° C. for a retention time of 1 hour with an insert metal with a thickness of about 40 μm being interposed between the base metal, which is S45C carbon steel, and a cobalt-based alloy material which has granular or massive eutectic carbide with a grain size not larger than 30 μm in a matrix of cast structure and contains 1.03 wt % C, 29.73 wt % Cr, 3.86 wt % W, 2.59 wt % Ni, 2.67 wt % Fe, 0.59 wt % Si, and 0.07 wt % Mo, the balance substantially being Co. The cobalt-based alloy layer1after bonding contains granular or massive eutectic carbide.

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“Section 3.4.3—Diffusion Welding”, JSME Mechanical Engineers' Handbook, 1987 ed., B2, pp. 63-64.
U.S. Appl. No. 09/775,792, filed Feb. 5, 2001.
U.S. Appl. No. 09/939,591, filed Aug. 28, 2001.

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