US2761778A

US2761778A - Alloy

Info

Publication number: US2761778A
Application number: US376759A
Authority: US
Inventors: Herman L Mann
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-08-26
Filing date: 1953-08-26
Publication date: 1956-09-04
Anticipated expiration: 1973-09-04

Description

United States Patent ALLOY Herman L. Mann, New York, N. Y.

No Drawing. Application August 26, 1953, Serial No. 376,759

4 Claims. (Cl. 75-171 This invention relates to metal alloys and more particularly to metal alloys having an advantageously low' fusing point and better flow properties.

It is an object of this invention to; provide an alloy endowed with special characteristics.

It is another object of this invention to provide an alloy having good flow properties and a low fusing point.

It is still another object of this invention to provide an alloy which is economical and has a low atomic weight so as to provide substantial volume at a lesser density.

Still another object of this invention is the provision of an alloy which is resistant to acids.

A still further object of this invention is to provide an alloy for casting which produces a smoother surface on the cast product.

These and other objects of this invention will become more apparent upon consideration of the following description.

In general this invention provides an alloy with a low fusing point and good flow properties which can be cast to a final product having a smoother surface than previous alloys. In particular, the alloy of this invention is useful for the manufacture of dentures.

Dentures are made by casting in refractories by the lost wax method. For various reasons it is advantageous to employ a gypsum refractory for the casting. A gypsum refractory requires the casting to be accomplished with a metal which has a fusing temperature of not more than 2500 F. To cast a metal it is also necessary that the metal have good flow properties as well as a minimum of impurities.

The alloy of this invention employs four principal ingredients which are chromium, cobalt, nickel and copper. Another ingredient which may be used in the alloy of this invention is beryllium. These ingredients endow the alloy of this invention with novel and desirable characteristics and provide an alloy which is particularly useful in the manufacture of dentures or jewelry.

The following examples serve to illustrate the alloys of the present invention but are not intended to limit the same:

2,761,778 Patented Sept. 4, 1956 Example 2 Metal: Per cent by weight Chromium 12 to 18 Cobalt 5 to 20 Nickel 45 to 60 Copper 18 to 26 Beryllium .25 to 1.0

Example 3 Metal: Per cent by weight Chromium 15 Cobal 5 Nickel 54 Copper--- 25 Beryllium 1 These alloys have a melting point between 2300 and 2500 F. They can be cast in a gypsum refractory to produce a satisfactory denture.

Among the advantages of this alloy in the manufacture of dentures is the light color of the alloy. Another advantage is the smooth surface of the product cast with this alloy which minimizes the amount and expense of finishing by polishing. As the alloy of this invention is resistant to acid including nitric acid, a denture formed of this alloy resists mouth acids. As this alloy has a low atomic weight the cubic volume occupied by this alloy is greater per unit of weight and the denture is correspondingly less expensive.

The beryllium which may be used in the alloy of this invention serves as a de-oxidizer to remove impurities and may be considered a scavenger in its function in the alloy of this invention.

The copper employed in the alloy of this invention acts to lower the fusing point and gives better flow properties to the alloy in casting and produces a product with a smoother surface.

Various changes may be made in the above described embodiments of this invention without departing from the spirit of the invention which is limited only by the appended claims.

I claim:

1. An alloy having as its principal ingredients chromium, nickel, cobalt and copper and containing chromium from 12 to 18 per cent by weight, cobalt from 5 to 20 per cent by weight, nickel from 45 to 60 per cent by weight,

copper from 18 to 26 per cent by Weight and beryllium from .25 to 1.0 per cent by weight.

2. An alloy consisting of chromium, nickel, cobalt and copper, the chromium content being 12% to 18% by weight, the nickel content being 45% to 60% by Weight, the cobalt content being 5% to 20% by weight and the copper content being 18% to 26% by weight, said alloy being characterized by a low fusing point and resistance to acids.

3. An alloy consisting of chromium, nickel, cobalt, copper and beryllium and containing, by weight, 12% to 18% chromium, 5% to 20% cobalt, 45% to 60% nickel, 18% to 26% copper and .25% to 1.0% beryllium.

4. A denture formed from an alloy consisting of by weight, 15% chromium, 5% cobalt, 54% nickel, 25% copper and 1% beryllium.

References Cited in the file of this patent UNITED STATES PATENTS 2,521,273 Wissler Sept. 5, 1950 2,636,818 Low Apr. 28, 1953 FOREIGN PATENTS 485,226 Great Britain May 17, 1938

Claims

1. AN ALLOY HAVING AS ITS PRINCIPAL INGREDIENTS CHROMIUM, NICKEL, COLBALT AND COPPER AND CONTAINING CHROMIUM FROM 12 TO 18 PER CENT BY WEIGHT, COBALT FROM 5 TO 20 PER CENT BY WEIGHT, NICKEL FROM 45 TO 60 PER CENT BY WEIGHT, COPPER FROM 18 TO 26 PER CENT BY WEIGHT AND BERYLLIUM FROM .25 TO 1.0 PER CENT BY WEIGHT.