US3437480A - Nickel-base alloys containing copper - Google Patents

Description

April 8, 1969 A. T. CAPE NICKEL-BASE ALLOYS CONTAINING COPPER Filed May 9, 196

WETTABILITY AND FLOWABILITY EXCELLENT L 1 l 2.5 5 7.5 I I25 I I25 22.5 27.5 32.5

PER CENT OF COPPER INVENTOR.

ARTHUR T. CAPE ATTORNEYS United States Patent 3,437,480 NICKEL-BASE ALLOYS CONTAINING COPPER Arthur T. Cape, Monterey, Calif., assignor to Coast Metals, Inc., Little Ferry, N.J., a corporation of Delaware Filed May 9, 1967, Ser. No. 637,236

Int. Cl. C22c 19/02 U.S. Cl. 75-170 2 Claims ABSTRACT OF THE DISCLOSURE A nickel-base alloy containing boron and silicon, and in which copper, in relatively large amounts is incorporated to produce excellent properties from the standpoint of wettability and flowability of the alloy.

This invention relates generally tonickel-base alloys, but has reference more particularly to hard facing alloys of this type containing boron and silicon.

Alloys of this general type are described in my U.S. Patents Nos. 2,743,177; 2,755,183; 2,899,302; 3,108,861 and 3,189,421.

In general, the composition of these alloys falls within the following ranges:

Percent Carbon ..3- 0.005-1 Boron 0.25-5.25 Silicon 1-5 .5 Chromium 0-20 Iron 0-15 Manganese 0-15 Cobalt 0-25 Nickel Remainder Certain alloys within this general composition range, known as Coast Metals No. 50B, consisting of 2.50% silicon, 1.50% boron, and the balance nickel, and No. 50C, consisting of 3% silicon, 1.80% boron, and the balance nickel, have been found of particular value for the repair of castings, and for providing wear-resistant overlays on dies and molds, particularly dies and molds used in the glass industry, which dies and molds are, in many cases, made of copper-base alloys, such, for example, as an alloy known as Incremet 800, and an'alloy known as Minox.

One of the difliculties encountered in utilizing such coating alloys for this purpose is that the alloys are not as satisfactory as they should be, from the standpoint of wettability and flowability with respect to the base metal.

I have found that this wettability and fiowability may be greatly improved by incorporating in the coating alloy copper in an amount of from about 12% to about 25% by weight of the alloy.

This increase in wettability and flowability of the coating alloy is indicated in the drawing which forms a part of this application, and to which reference will now be made.

In the drawing, the coating alloy known as 50B, to which reference has been made, was tested as to wettability and flowability on copper-base alloys by adding copper, in gradually increasing amounts, to the coating alloy.

It was found that as the percentage of copper in the coating alloy was increased, the wettability and flowability of the alloy improved, but that the improvement was not marked until the copper in the alloy 'was about 12%. Beyond 12%, the marked improvement continued, reaching a maximum at about 17.5% copper. Beyond 17.5% copper, the wettaibility and fiowability of the alloy ranged from excellent to good until the copper content reached 25%, but beyond 25 the melting point of the coating alloy increased, producing a poorly flowing alloy. This increase in melting point caused some melting of the base metal which, combining with the coating alloy, created porosity and improper flow of the coating alloy. This increase in melting point was also accompanied by an undesirable increase in the hardness of the coating alloy.

It was found, moreover, that it was essential to maintain the coating alloy as free as possible of molybdenum, since this element had a tendency to produce an undesirably wide liquidus-solidus range for the molten alloy.

Range, Percent Preferred alloy Carbon 0. 005-1 B o ron 0. 25-5. 25 1. 50 31110011. l5. 5 2. 50 Chromium 0-20 5 00 on 0-15 Manganese 0-15 Cobalt. 0-20 12-25 1 17. 5 Remainder Balance 1 Percent.

The alloy is also useful for repair and overlay work on cast iron, steel and other base metals, requiring a surface which is wear-resistant at all temperatures, and is also adapted for use as a brazing material.

Having thus described my invention, 1 claim:

1. A nickel-base alloy especially adapted for overlay Work on dies and molds in the glass industry, said alloy consisting of .005 to 1.00% carbon, 0.25 to 5.25% boron, 1 to 5.5% silicon, up to 20% chromium, up to 15% iron, up to 15 manganese, up to 25 cobalt, 12 to 25 copper, and the remainder essentially all nickel.

2. A nickel-base alloy especially adapted for overlay work on dies and molds in the glass industry, said alloy consisting of about 1.50% boron, about 2.50% silicon, about 5% chromium, about 17.5 copper, and the balance essentially all nickel.

References Cited UNITED STATES PATENTS 2,899,302 8/1959 Cape et al. 170 2,936,229 5/ 1960 Shepard 75-170 2,968,550 1/1961 Eash 75171 3,293,029 12/ 1966 Broderick et a1 75159 RICHARD O. DEAN, Primary Examiner.

U.S. C1. X.LR. 75--171

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