Enhanced Co-based alloy

Details Enhanced Co-based alloy Enhanced Co-based alloy

1993-12-20

1995-06-06

Wyszomierski, George

Alloys or metallic compositions

Cobalt base

Chromium containing

420440, 420585, 420586, 420588, C22C 1907, C22C 3000

Patent

active

054220726

ABSTRACT:
A Co-based alloy exhibits superior high-temperature strength and resistance properties. In one embodiment, the Co-based alloy contains, in weight percent, from about 0.1 to about 1.2 of C; from about 0.01 to about 2 of at least one of Si and Mn; from about 22 to about 37 of Cr; from about 5 to about 15 of Ni; from about 0.1 to about 3.5 of Re; with a balance being Co and incidental impurities. Co and C, Si, Mn, Cr, Ni, Re, B, Zr, W, Mo, Ta, and Nb impart high-temperature wear resistance to the alloy to withstand repeated temperature cycling in a glass spinnaret. In one embodiment of the present invention, Hf is added to improve molten glass corrosion resistance, while Y and other rare earth elements are added in alternate embodiments to improve high-temperature oxidation resistance. Percentages by weight are disclosed for enhanced high-temperature oxidation resistance, increased fluid wear resistance and enhanced molten glass corrosion resistance.

REFERENCES:
patent: 4618474 (1986-10-01), Ohe et al.
patent: 4765817 (1988-09-01), Gaul
patent: 4877435 (1989-10-01), Haebale et al.
patent: 5240491 (1993-08-01), Budinger et al.
Derwent Abs 86-003140 of JP60-228,637, 1986.

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