US2566283A

US2566283A - Spinnerette

Info

Publication number: US2566283A
Application number: US81157A
Authority: US
Inventors: Dowson Arthur Gordon
Original assignee: Baker and Co Inc
Current assignee: Baker and Co Inc
Priority date: 1948-03-16
Filing date: 1949-03-12
Publication date: 1951-08-28
Anticipated expiration: 1968-08-28
Also published as: NL72535C; CH280429A; FR983234A; DE812842C

Description

28, 1951 A. G. DOWSON 2,566,283

SPINNERETTE Filed March 12, 1949 RHODIUM 1- PLATINUM %GOLD INVENTOR. ARTHUR ORDON DOWSON' ATTQENEY Patented Aug. 28, 1951 SPINNERETTE Arthur Gordon Dowson, London, England, as signor to Baker & Company Incorporated, N ewark, N. J., a corporation of New Jersey Application March 12, 1949, Serial No. 81,157

In Great Britain March 16, 1948 i This invention relates to spinnerettes such as are employed in the production of synthetic fibres and filaments for production of rayon, artificial silk, artificial wool and other similar materials. Spinnerettes of this character essentially include a jet or nozzle through which the substance or material for extrusion is expelled under pressure. It is important that the spinner- .ette jets should be made of a metallic substance which will resist erosion and any tendency to corrode.

Up to the present it has been proposed to make spinnerette jets from precious metal alloys, such for example as gold alloyed with up to 40% platinum; and also platinum alloyed with up to 15% of rhodium. In British Patent No. 563,648 there is disclosed an alloy for a spinnerette in which platinum and rhodium are combined with ruthenium. These platinum-rich alloys have been found particularly advantageous as compared with the known gold-rich gold platinum alloys in that they possess the highest possible resistance to corrosion and can be produced with a very fine grain, which enables the holes to be accurately drilled and the walls to be given a very high polish.

It is an object of the present invention to devise a superior precious metal alloy for constructing spinnerette jets which will retain all the advantages of the platinum-rich alloys referred to above but which will have in addition a very high hardness. This is achieved by employing alloys of platinum with rhodium and gold which are age-hardening, and it is therefore possible to make a sheet of the alloy in a reasonably soft condition to allow mechanical forming of the spinnerette cups and drilling of the holes. The formed spinnerettes can then be hardened by heat treatment.

In accordance with the present invention, spinnerette jets are made from an alloy of platinum with rhodium and gold, which alloy contains 4 to 15% of gold, 5 to of rhodium and the balance of platinum, the proportions being so selected that for gold contents less than 5% the minimum rhodium content is increased above 5% by an amount equal to five times the amount by which the gold content is below 5%. Thus with a gold content of 4.5% the rhodium must be not less than 7.5 and with 4% gold the rhodium must be not less than 10%. When both rhodium and gold are present in quantities approaching the stated maxima the hardness oi the allow in the softest condition is increased so that the forming and drilling operations become difficult.

seams. (01. 18 -8),

For practical purposes the total gold and rhodium content preferably should not exceed about 25%. Whereas with the previously known platinumrich alloys it was not feasible to produce jets having a finished hardness greater than about 200 .V. P. N., jets made according to the present invention can be produced with a hardness of 400 V. P. N. or even higher.

The above alloys are shown in the drawing which represents a graph or diagram thereof.

To show how the invention may be carried into effect several examples will now be given.

Example I In this example, an alloy is prepared containing:

% platinum '7 rhodium 7 Vs gold The alloy is produced in sheet form and is treated by raising it to a temperature of about 1050 C. to1100 C.- for 15 minutes. It is then quenched in cold water and is thereafter mechanically formed by the production of the cup and the drilling thereof. The formed jet is then heated for l to 2 hours at a temperature of 620 to 650 C. and allowed to cool. The finished jet has a hardness of 350 to 400 V. P. N or better.

Example II In this example, an alloy is prepared contain- 1118:

85% platinum 5% gold 10% rhodium The process of producing the finished jet is substantially the same as in Example I and the hardness of the finished jet is about 450 V. P. N.

Example 17V In this example the proportions of the constituents of an alloy are chosen to be the same as those of Example I except that 20% of the platinum is replaced by palladium, the replacement being made atom for atom. It will of course be understood that the expresison "atom for atom is used to mean that 20% of the platinum is excluded and an amount of palladium containing an equivalent number of atoms is substituted. The weight of the palladium will thus be less than that of the platinum which it replaces. The alloy prepared in this way is processed in the manner described in Example I and the hardness of the finished jet will be of the order of 250 to 300 V. P. N.

It will be realised from cons deration of Example IV that it is possible to substitute under certain circumstances a certain amount of platinum by palladium. The alloy produced does not necessarily give as good results as those in which there is not substitution of platinum constituent but as will be appreciated it is often possible to substitute in a platinum-rich alloy a proportion of palladium without significantly altering the final desired properties of the alloy.

The proportions of the constituents of the alloys that may be used in the fulfilment of the invention are illustrated by reference to the. accompanying diagram. The diagram represents the conventional diagram for a ternary alloy. The horizontally hatched. portion includes within it those points which define the desired ratio of proportion between the three constituents. From the diagram it can be seen that as the gold constituent is reduced from to 4% the corresponding range for rhodium increases. Thus for an increment of reduction in the gold as between 5% and 4%, the minimum rhodium content increases by an increment that is five times as great as the first mentioned increment, thereby ensuring that when the gold constituent is reduced to 4% the minimum rhodium constituent has been increased to V I claim: v n V 1. A spinnerette of an alloy of platinum with rhodium and gold, which alloy contains 4 to of gold, 5 to 15% of rhodium and the balance of platinum, the proportions being so selected that for gold contents less than 5% the minimum rhodium content is increased above 5% by an 4 amount equal to five times the amount by which the gold content is below 5%.

2. A spinnerette as claimed in claim 1 wherein said alloy has a maximum aggregate amount of gold and rhodium equal to 25%.

3. A spinnerette as claimed in claim 2 wherein the alloy is age-hardened, said age-hardening being carried out after the spinnerette has been formed.

4. A spinnerette as claimed in claim 3 wherein the spinnerette is formed from a sheet of the alloy after the latter has been heat treated for approximately 15 minutes at 1050 to 1100 C. and quenched, the formed spinnerette being then heated for 1 to 2 hours at 620 to 650 C. and allowed to cool.

5. A spinnerette as set forth in claim 1 wherein the platinum content is replaced to anextent of not more than 20% by an atom for atom quantity of palladium.

. ARTHUR GORDON DOWSON.

REFERENCES CITED" The following references are of record in the file of this patent:

UNITED STATES PATENTS OTHER REFERENCES Rhodes, treatise in Metal Industry, May ll, 1945, pages 290, 291.

Claims

1. A SPINNERETTE OF AN ALLOY OF PLATINUM WITH RHODIUM AND GOLD, WHICH ALLOY CONTAINS 4 TO 15% OF GOLD, 5 TO 15% OF RHODIUM AND THE BALANCE OF PLATINUM, THE PROPORTIONS BEING SO SELECTED THAT FOR GOLD CONTENTS LESS THAN 50% THE MINIUM RHODIUM CONTENT IS INCREASED ABOVE 5% BY AN AMOUNT EQUAL TO FIVE TIMES THE AMOUNT BY WHICH THE GOLD CONTENT IS BELOW 5%.