JP2677307B2 - Manufacturing method of platinum alloy spring material for ornaments - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a platinum alloy spring material for ornaments such as tie pin springs and clip-shaped broaches.

(Prior art) Pt-Pd binary system,
Pt-Pd-Cu ternary alloys are commonly used for rings, necklaces,
It was used for accessories such as tie pins and brooches.

However, although Pt-Pd binary alloys have excellent workability and castability, they have low mechanical strength, especially low hardness, so they are easily scratched or scratched during polishing, and are less likely to produce gloss, and Even when it is used as a finished product, it is easily scratched, and in the case of a ring with jewelry, there is a drawback that the part holding the jewelry loosens and the jewelry comes off.

Further, the Pt-Pd-Cu ternary alloy has excellent workability similar to the Pt-Pd binary alloy, and also has excellent mechanical strength, but since it reacts with the mold during casting, it has a fine pattern. Does not appear,
Since it becomes unclear and the oxygen concentration cannot be suppressed, there is a drawback that porosity occurs.

As a platinum alloy for decorations, which has excellent mechanical strength and castability as well as workability, 84 to 96 wt% platinum, 1 to 10 wt% gallium, and the balance copper Was developed. (See Japanese Patent Application Laid-Open No. 59-150042) (Problems to be Solved by the Invention) By the way, the above-mentioned platinum 84 to 96% by weight and gallium 1 to 10
The platinum alloy for decorations, which is composed by weight% and the balance copper, is heated during brazing of parts during the manufacturing process of the decorations, so that the material hardened by the processing becomes soft. Therefore, it cannot be used for, for example, a clip-type ornament that utilizes the spring property.

Therefore, the present invention is to provide a method for producing a spring material which is hard and has excellent spring properties and which is suitable as a clip-type decorative article, in the platinum alloy for decorative articles made of platinum, gallium and copper. .

(Means for Solving the Problem) A method for manufacturing a platinum alloy spring material for decorative articles of the present invention for solving the above-mentioned problems is 84-96 wt% platinum, 1-gallium gallium.
In a method of manufacturing a platinum alloy spring material for ornaments, which comprises 10% by weight and 0.5 to 10% by weight of copper, 400 to 600
It is characterized by heat treatment at ° C.

In the method for manufacturing a platinum alloy spring material for decorative articles of the present invention, after brazing the parts, the reason for heat treatment at 400 ~ 600 ℃,
This is because gallium is dispersed and precipitated in the crystal to harden the spring material. If the temperature is lower than 400 ° C, the spring material will not be sufficiently hardened, and if it exceeds 600 ° C, the spring material will become soft and the brazing material will melt.

(Operation) As described above, in the method for manufacturing the platinum alloy spring material for decorative articles of the present invention, after brazing the parts in the middle of the decorative article processing step, the brazing material is heat-treated at a low temperature of 400 to 600 ° C. Platinum alloy spring material for ornaments softened by brazing is
Ga is dispersed and precipitated in the crystal, the hardness is increased, the spring property is strengthened, and a platinum alloy spring material having a function of a clip type ornament, that is, a clamp holding function is obtained.

(Example) Explaining an example of a method for producing a platinum alloy spring material for decorative articles of the present invention, width 5 mm, thickness 0.4 mm, length of platinum alloy for decorative articles of the component composition shown in the left column of the following table 30mm spring material,
Parts such as Pt-Pd 10 wt% width 2 mm, length 10 mm,
A 0.2 mm-thick tape is used with Au-Pd 30 wt% brazing filler metal 1,4
When the hardness was measured by brazing at 00 ° C, the results shown in the center column of the table below were obtained. And spring material at 500 ℃ 1
After heat treatment for a period of time, the hardness was measured and the results shown in the right column of the table below were obtained.

As is clear from the above table, according to the embodiment of the method for producing a platinum alloy spring material for decorative articles of the present invention, the hardness after brazing of the parts was reduced by annealing, but it was significantly hardened by the heat treatment. You can see that This is because Ga in the spring material was dispersed and precipitated in the crystal due to the heat treatment. Thus, the platinum alloy spring material for ornaments has a strong spring property and has a clip-type ornament holding function.

(Effects of the Invention) As described in detail above, according to the method for producing a platinum alloy spring material for a decorative article of the present invention, a clip type decorative article such as a tie pin spring and a clip-shaped brooch is hard and has excellent spring properties. There is an effect that a spring material suitable for use can be obtained.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C22F 1/00 680 8719-4K C22F 1/00 680 691 8719-4K 691B

Claims (1)

(57) [Claims] 1. A method for producing a platinum alloy spring material for decoration, comprising 84 to 96% by weight of platinum, 1 to 10% by weight of gallium and 0.5 to 10% by weight of copper, and 400 to 600 ° C. after brazing parts. A method for manufacturing a platinum alloy spring material for ornaments, which comprises heat-treating.