JP2003047512A - Platinum accessories, brazing material, and brazing method - Google Patents

Abstract

(57) Abstract: A platinum jewelry, a brazing material, which has a joint by means of a hall mark, for example, a brazed joint that maintains high purity and can be applied to any material that meets the criteria of Pt1000.
And a brazing method. Higher hardness Pt1
The present invention provides a platinum accessory, a brazing material, and a brazing method that can maintain high strength against external force even when the accessory is formed using a platinum alloy of 000 as a base material. SOLUTION: This platinum ornament has a joint part by brazing. It has a main body made of a platinum alloy and a brazing material for joining a part of the main body to each other. The brazing material is platinum 9
A platinum alloy containing 5.6% by weight or more and boron in a ratio of 1.3% by weight or more and 4.4% by weight or less, and a platinum alloy containing 94.1% by weight or more of silicon and 3.4% by weight or more and 5.9% by weight of silicon % Of the platinum alloy and a platinum alloy in which both are mixed. The brazing width of the joint is set in a range of 0.1 mm or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hall mark (certification stamp of the Ministry of Finance Mint) "Pt850, Pt900, P".
The present invention relates to a platinum accessory, a brazing material, and a brazing method that meet the certification criteria of "t950, Pt1000, etc."

[0002]

2. Description of the Related Art Generally, for jewelry such as rings and necklaces, platinum alloy products, which are recognized as high-class and rare due to their elegant luster, are preferred. When manufacturing, repairing, or repairing the accessory made of platinum alloy, a technique of joining the joined parts by brazing is used. The brazing material used for this brazing is
As the melting point is lower than that of platinum (melting point is 1776 ° C. for platinum alone), the heating is easier, and at the same time, the accessory itself is less likely to be affected by heat, and the outer shape of the accessory is not thermally deformed. It is possible to easily join the joining portions. As the brazing material used in this platinum accessory, for example, Ag (silver) -based or white gold-based brazing material having a melting point of 1000 ° C. or lower and around 1000 ° C. has been used. For the purpose of maintaining the purity of platinum as much as possible, a Pt-Pd (platinum-palladium) -based brazing material having a melting point of around 1500 ° C has been used.

In recent years, in order to obtain a more pure brilliance, the Mint Bureau of Finance Ministry Mint Certification "Hall Mark""Pt1000"
High-grade jewelry made of a platinum alloy that complies with the certification standard (elements other than platinum contained in platinum within 0.3% by weight) is becoming popular. Very soft and easily damaged. Therefore, "P
Within the range of not exceeding the t1000 "certification standard, for example, boron or the like has been added, and a high-hardness platinum alloy has been developed that is resistant to scratches and deformation while satisfying the" Pt1000 "standard.

[0004]

[Problems to be Solved by the Invention] However, "Pt
When joining jewelry that conforms to the 1000 "standard,
Ag base, white gold base, P as described above
When a t-Pd-based brazing material is used, even if the ring conforms to the "Pt1000" certification standard, for example, if brazing is performed at the time of resizing, the platinum purity as a whole is 99.
There is a possibility that it will be 7% by weight or less, and if the size is changed, the true quality and added value of "Pt1000" will be reduced. The purity other than rings is 99.7.
Even with jewelry items made of platinum alloy of more than weight%, if brazing is performed during processing or repair, the same problem as that of ring size correction occurs. Further, when the method of using a brazing material of the same material as the accessory (Tomosuke) is applied to the accessory made of platinum alloy, the melting point of the brazing material and the melting point of the platinum alloy forming the accessory are almost equal (about 1700 to 1800 ° C). ), The outer shape of the accessory may be deformed by heat, and it is very difficult to do it while maintaining the outer shape of the accessory. Was disadvantageous. In particular, the above-mentioned high hardness and purity of 9
In 9.7 wt% or more platinum alloys, it is considered that intermetallic compounds with a low melting point are partially generated, and when exposed to high temperatures, the intermetallic compounds become liquid first and deform or deform. However, there is a high possibility that the quality will deteriorate.

Further, generally, when brazing is performed on the accessory, the accessory itself is inevitably heated (fired), so that recrystallization or the like occurs in the vicinity of the joint of the accessory and becomes an annealed state. The hardness deteriorated, causing scratches, deformation, and other quality deterioration.

The above-mentioned accessory made of the platinum alloy of high hardness "Pt1000" does not show a significant decrease in strength after brazing, but the intermetallic compound contained therein is liquid in the high temperature environment in which brazing is performed. Therefore, when a breaking stress such as impact is applied, the shape and the opening are likely to occur.

The subject of the present invention is a platinum accessory or brazing material having a joint by brazing which maintains a high purity applicable to any material satisfying the standard of "Pt1000" by a hall mark (certification stamp of the Ministry of Finance Mint). , And a brazing method. Further, it is an object of the present invention to provide a platinum accessory, a brazing material and a brazing method which can maintain high strength against external force even when the accessory is molded by using a platinum alloy of high hardness "Pt1000" as a base material. .

[0008]

The invention according to claim 1 is
For example, as shown in FIG. 1, in a platinum accessory (ring 1) having a joint by brazing, a body part (2) made of a platinum alloy and a brazing material (5) for joining part of the body part together. The brazing material includes a platinum alloy containing 95.6% by weight or more of platinum and 1.3% by weight or more and 4.4% by weight or less of boron, and 94.1% by weight or more of platinum containing silicon. The platinum alloy is contained in a proportion of 3.4 wt% or more and 5.9 wt% or less, and a platinum alloy obtained by mixing the two, and the brazing width of the joint is It is characterized by being set in a range of 0.1 mm or less.

According to the invention described in claim 1, the melting point of the brazing material is made to be significantly lower than the melting point of the platinum simple substance (1776 ° C.) by using the above-mentioned composition of the brazing material. You can In other words, if it is a high-purity platinum alloy, its melting point is close to the melting point of platinum itself, so when the main body is made of platinum alloy, the heat of the molten brazing material is conducted to the main body. Also, it is possible to prevent the platinum alloy forming the main body from melting and maintain its shape. Therefore, brazing can be performed easily without worrying about thermal deformation of the accessory itself, and therefore, the main body is composed of a plurality of members, and when the plurality of members are joined (for example, at the time of manufacturing or It is possible to improve work efficiency when repairing) or when the main body part is a single member and two different parts of the member are joined (for example, when the size of a ring or the like is adjusted).

Also, in general, Pt-B (platinum-boron)
Alloy, Pt-Si (platinum-silicon) alloy, Pt-B-
The Si (platinum-boron-silicon) alloy is an intermetallic compound that forms an ordered lattice and is a very brittle and poorly-utilized alloy because of its high covalent bond property, but the brazing width is 0.1 mm or less. In the range, that is, when the brazing material is thinned, it becomes difficult to apply an external force to the brazing material, and the brazing strength can be stabilized. It should be noted that the brazing width gap is easy to process if it is parallel, but it is possible to secure strength as long as the gap is within the range of 0.1 mm or less, regardless of whether the gap is first closed or first opened. . The brazing width is 0.1
Since it is set in the range of mm or less, the brazed part is much smaller than the main body part, and it is possible to prevent the brazing material from being included in the test piece taken from the accessory during the quality test. You can Since the brazing material itself is a high-purity platinum alloy, and the brazing width is set to a very small value compared to the body, it is possible to make the difference in hue between the body and the brazing material inconspicuous. it can.

According to a second aspect of the present invention, in the platinum accessory according to the first aspect, the body portion (2) has a platinum content of 9
It is characterized by being composed of 9.7% by weight or more of a platinum alloy.

According to the second aspect of the invention, by making the brazing material to have the above composition, the melting point of the brazing material can be made significantly lower than the melting point of platinum alone (1776 ° C.). You can That is, in the case of a high-purity platinum alloy, its melting point is close to the melting point of platinum alone, so the main body is made of a high-purity (platinum content of 99.7% by weight or more) platinum alloy. In this case, even if the heat of the melted brazing material is conducted to the main body, the platinum alloy forming the main body can be prevented from melting and its shape can be maintained. Therefore, high-purity brazing can be easily performed without worrying about thermal deformation or the like of the accessory itself. Therefore, when the main body is composed of a plurality of members and the plurality of members are joined (for example, manufacturing The working efficiency can be improved when the main body part is a single member and two different parts of the member are joined (for example, when the size of a ring or the like is resized).

Further, in the case of the above-mentioned high hardness "Pt1000" platinum alloy, by using the brazing material,
Brazing can be performed at 0 ° C or less, the liquid phase generated in the main body can be suppressed, deformation, cracking, collapse, deterioration of quality etc. can be prevented unless stress above a certain level is applied, and its shape Can be brazed while maintaining.

Also, in general, Pt-B (platinum-boron)
Alloy, Pt-Si (platinum-silicon) alloy, Pt-B-
The Si (platinum-boron-silicon) alloy is an intermetallic compound that forms an ordered lattice and is a very brittle and poorly-utilized alloy because of its high covalent bond property, but the brazing width is 0.1 mm or less. In the range, that is, when the brazing material is thinned, it becomes difficult to apply an external force to the brazing material, and the brazing strength can be stabilized. In addition, since the brazing width is set within the range of 0.1 mm or less, the brazing portion is much smaller than the main body portion, and the test piece collected from the jewelry during the quality test, It is possible to suppress inclusion of a brazing material. Even if the test piece contains a brazing part, the proportion of the brazing material in the test piece is very small compared to other parts of the test piece (platinum alloy forming the main body), and the platinum content is high. Rate is at least 94.1% by weight
Since the above is secured, the platinum content of the main body
Lower limit of certification standard for "Pt1000" (99.7% by weight)
If it is set slightly higher than the above, it is possible to prevent the platinum content from falling below 99.7% by weight even in a test piece containing a brazing material. Furthermore, the brazing material itself is a high-purity platinum alloy, and the brazing width is set to a very small value compared to the main body, so the difference in hue between the main body and the brazing material is inconspicuous. be able to.
Therefore, even if the platinum accessory after brazing is "P
It can pass the quality test of t1000 ". In other words, even if the platinum accessory having the quality of" Pt1000 "is brazed for repair or resize,
It is possible to prevent the deterioration of quality as t1000 ″.

According to a third aspect of the present invention, in the platinum accessory according to the second aspect, the main body portion has a platinum content of 9
9.7 wt% or more, and as additional elements, silicon, magnesium, zirconium, aluminum,
One or two or more elements selected from calcium and thorium, and a main forming part (3) formed by forming a platinum alloy to which boron is added, and a softer than platinum alloy forming the main forming part. A cushioning member (4) formed of a platinum alloy having a platinum content of 99.7% by weight or more,
The platinum is characterized in that the buffer member is interposed between the parts to be joined of the main forming part, and the part of the main forming part and the buffer member are brazed with the brazing width. Trinkets.

According to the invention of claim 3, the cushioning member is formed of a platinum alloy having a platinum content which is softer than that of the platinum alloy forming the main forming portion and has a platinum content of 99.7% by weight or more. Since it is brazed to a part of the main forming part with a brazing width and is interposed between parts to be joined of the main forming part, if a breaking stress such as impact acts on the accessory, a cushioning member The breaking stress can be absorbed and relieved. Therefore, when an unsteady stress is applied to the main body portion, cracks are likely to occur in the brazing material due to the high toughness of the main forming portion, but by interposing a buffer member having lower strength and toughness than the main forming portion, The stress is not concentrated on the brazing material portion, and the generation of cracks can be prevented. Further, since the main molding portion and the cushioning member are separate members, even if the accessory does not have the cushioning member in advance, it is possible to newly attach the cushioning member later.

The brazing material according to the present invention is platinum 9
Platinum alloy containing 5.6% by weight or more of boron in a ratio of 1.3% by weight or more and 4.4% by weight or less, and platinum 94.1% by weight or more and silicon of 3.4% by weight or more and 5.9% by weight % Platinum or less, and a platinum alloy containing a mixture of both platinum alloys.
Further, it is characterized in that the brazing width is used within a range of 0.1 mm or less.

According to the invention of claim 4, it is possible to obtain the same effect as that of claim 1.

The invention according to claim 5 is a brazing method using the brazing material according to claim 4, wherein the member brazed by the brazing material has a platinum content of 99.7% by weight or more. It is characterized by being made of platinum alloy.

According to the invention of claim 5, it is possible to obtain the same effect as the effect of claim 2.

According to a sixth aspect of the present invention, in the brazing method according to the fifth aspect, the member to be brazed has a platinum content of 99.7% by weight or more and silicon as an additive element. It is characterized by being composed of a platinum alloy to which boron and one or more kinds of elements selected from magnesium, zirconium, aluminum, calcium and thorium are added.

According to the sixth aspect of the present invention, the strength can be maintained even when the member to be brazed is formed of the high hardness platinum alloy having the above composition, and at the time of brazing. It is possible to deal with the resulting decrease in the strength of the joint portion.

According to a seventh aspect of the present invention, in the brazing method according to the sixth aspect, when brazing the joint portions of the members, the content of platinum is softer than the member between the joint portions. Is interposed between buffer members formed of a platinum alloy of 99.7% by weight or more, and the buffer members and the joint portion are brazed by the brazing material.

According to the invention of claim 7, it is possible to obtain the same effect as that of claim 3.

According to an eighth aspect of the present invention, in the brazing method according to the seventh aspect, the member is a ring (1), and when the ring is resized, the annular ring is cut so as to open, and When the combined length of the cushioning member and the length of the ring that has been cut and opened is longer than the length of the ring to be repaired, the ring from the cut end of the ring Part of the ring is removed, the cushioning member is sandwiched between the cut ends of the ring, and one cut end of the ring and one end of the cushion member corresponding to the cut end are brazed. At the same time, the other cut end of the ring is brazed to the other end of the cushioning member corresponding to the cut end.

According to the invention described in claim 8, even if the member to be brazed is a ring, the ring and the cushioning member are brazed when the size of the ring is resized.
All the effects of ~ 7 can be obtained.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below by exemplifying a ring as a platinum accessory as shown in FIG.

The composition analysis in this embodiment is carried out by the curcumin absorptiometry for boron, and ICP emission analysis (Inductively Coupled Pl) for other elements.
asma atomic emission spectrometry).

The ring 1 is basically of a different size, and has a body portion 2 having a substantially C-shaped main molding portion 3 and a cushioning member 4 arranged between both ends of the main molding portion 3. It is constituted by a brazing material 5 that joins parts of the main body 2 (the cushioning member 4 and the main molding portion 3). That is, the cushioning member 4 is interposed between the parts of the main molding part 3 and brazed to a part of the main molding part 3, so that the ring 1 has the joint part 6 by brazing, and The outer shape is formed in a ring shape.

The main molding portion 3 of the main body portion 2 is molded from a platinum alloy, and the embodiment will be described with a platinum content of 99.7% by weight or more. The main forming part 3 contains 99.7% by weight or more of platinum, and as an additive element, one or more elements selected from silicon, magnesium, zirconium, aluminum, calcium, and thorium, and boron. And the total content of these additional elements is 0.002% by weight or more and 0.3
It is formed of a platinum alloy that is set to be less than or equal to wt%. This platinum alloy does not lose its color tone and high-grade feeling due to the coexisting action of one or more elements selected from silicon, magnesium, zirconium, aluminum, calcium, and thorium with boron, and has no scratches. It is strong against deformation and deformation, has high hardness, high toughness, and is excellent in workability. Further, since the platinum content is 99.7% by weight or more, it is possible to satisfy the certification standard of the "Pt1000" hole mark.

The buffer member 4 is made of a platinum alloy having a platinum content of 99.7% by weight or more, which is softer than the platinum alloy for forming the main forming portion 3. For example, as compared with the additive element contained in the platinum alloy forming the main forming part 3,
One or more elements selected from silicon, magnesium, zirconium, aluminum, calcium, and thorium, or by reducing the content of at least one of boron or at least one of the elements, the platinum alloy itself The hardness can be softened.

The brazing material 5 is formed of a platinum alloy for forming the main forming portion 3 or a platinum alloy for forming the cushioning member 4 so that the main forming portion 3 and the cushioning member 4 are not thermally deformed during brazing. Platinum alloys have been used that have a lower melting point compared to. Specifically, a platinum alloy containing 95.6% by weight or more of platinum and 1.3% by weight or more and 4.4% by weight or less of boron, and 94.1% by weight or more of platinum and 3.4% of silicon.
Any one of three platinum alloys is used, which is a platinum alloy contained in a proportion of not less than 5% by weight and not more than 5.9% by weight, and a platinum alloy obtained by mixing the two. If the platinum alloy for forming the main body 2 is a high-purity platinum alloy, the melting point is close to the melting point of platinum alone (1776 ° C.).
In the Pt-B (platinum-boron) -based alloy and the Pt-Si (platinum-silicon) -based alloy having the above-described compounding ratios, the melting points are at least 1000 ° C or less, respectively, and even when compared with the melting point of platinum alone, It ’s low at around 800 ℃,
The body 2 can be brazed without being thermally deformed by the heat of the brazing material 5. Furthermore, the mixing ratio of the Pt-B alloy and the mixing ratio of the Pt-Si alloy are
When the blending ratio is such that a eutectic reaction occurs, the melting points of both are lowered to the eutectic point (Pt-B alloy: about 790 ° C, Pt-Si alloy: about 830 ° C) to mold the main body 2. The difference between the melting point of the platinum alloy and the melting point of the platinum alloy can be widened, and the influence of heat during brazing on the main body 2 can be further suppressed.

A platinum alloy (Pt-B-Si) obtained by mixing both the Pt-B-based alloy and the Pt-Si-based alloy.
(Platinum-boron-silicon) alloy), the melting point is 10
The melting point is below 00 ° C., and the melting points are almost the same as those of the individual materials, and similar effects can be obtained.

The brazing with the brazing material 5 is performed at the joint 6
The brazing width H of is set to be in the range of 0.1 mm or less. Generally, Pt-B based alloy, Pt-S
The i-based alloy and the Pt-B-Si-based alloy are intermetallic compounds that form an ordered lattice, and because they have a high covalent bond, they are very brittle and have a low utility value. By making H very thin compared to the main body 2,
It is possible to suppress the external force applied to the brazing material and stabilize the brazing strength.

The above-mentioned ring 1 has a size changed in advance. Generally, the ring has an annular ring portion, and the ring portion is formed of a single material at the time of manufacture. . That is, the ring is sold in a state in which the cushioning member 4, the brazing material 5 and the like described above are not included in the ring portion. For such a ring, for example, the size may be changed when the purchaser's body changes or the user changes. At that time, by using the above-mentioned cushioning member or brazing material, Even rings that are manufactured in a conventional manner can have the configuration that is a feature of the present invention. In addition, when there is no ring of the size suitable for the purchaser at the time of sale, the ring may be sold after being adjusted to fit the purchaser. In this case, the ring of the present invention is directly sold. It is possible.

The procedure of the brazing method performed when the size of the ring is corrected will be described below.

First, the ring portion is cut so as to be opened to form a C shape. Then, both lengths of the cushioning member having the same thickness as the ring portion and the length of the ring portion are adjusted so that the combined length is a length to be corrected.
Here, the length of the cushioning member must be set to at least a length that cushions the external force received by the ring and softens the fracture stress received by the ring portion, and for example, even when reducing the size, the cushioning member is cushioned. The length of the member needs to be a preset length as described above. Further, in the case of increasing the size, the length of the cushioning member may be made longer than the preset length. That is, when the length of the cushioning member and the length of the cut and opened ring portion are longer than the length of the ring portion to be repaired, the cut end portion of the ring portion is longer. Remove a part of the ring part from the and adjust the length corresponding to the size to be repaired. Then, a cushioning member is sandwiched between the cut ends of the ring portion, and one cut end of the ring portion and one end of the cushion member corresponding to the cut end are brazed together, and The other cut end is brazed to the other end of the cushioning member corresponding to the cut end.

The cushioning member may be attached to the ring not only when the size is adjusted but also when repairing other portions of the ring, and the cushioning member is attached only for the purpose of providing the ring. You may work.

As described above, according to the ring of the present embodiment, the brazing material 5 contains platinum containing 95.6% by weight or more of platinum and 1.3% by weight or more and 4.4% by weight or less of boron. Alloy and 3.4% silicon with 94.1% by weight or more of platinum
The melting point of the brazing filler metal 5 is one of three platinum alloys, one of which is a platinum alloy containing at least 5.9% by weight and the other of which is a mixture of both. The melting point of the platinum alloy that forms the main body 2 is significantly lower, and the platinum alloy that forms the main body 2 can be prevented from melting and its shape can be maintained. Therefore, brazing can be performed easily without worrying about thermal deformation of the accessory itself. Therefore, it is possible to improve work efficiency such as manufacturing, size correction, and repair. Further, since the brazing width H is set in the range of 0.1 mm or less, the brazing portion is much smaller than that of the main body 2, and the test piece collected from the accessory during the quality test. It is possible to prevent the brazing material 5 from being included in the. Even if the test piece includes a brazed portion, the proportion of the brazing material 5 in the test piece is very small compared to the other portion of the test piece (platinum alloy forming the main body), and the platinum content is Since the content is at least 94.1% by weight or more, the platinum content in the main body should be set slightly above the lower limit (99.7% by weight) of the "Pt1000" certification standard. For example, even in the case of a test piece containing a brazing material, it is possible to prevent the platinum content from falling below 99.7% by weight. Therefore, even if the ring after brazing is "P
It is possible to pass the quality test of t1000 ".
It goes without saying that the same effect can be obtained even when applied to a platinum alloy having a purity lower than Pt1000.

In the present embodiment, the ring 1 is used as an example of the platinum accessory, and the characteristics of the present invention have been described. However, any accessory (for example, a ring, a necklace, etc.) can be used as long as the accessory is mainly made of platinum alloy. It is also applicable in bracelets, brooches, earrings, piercings, etc.). Further, the ring provided with the cushioning member may be manufactured in advance, and in such a case, it is not necessary to newly provide the cushioning member after the sale. It should be understood that the embodiments disclosed this time are exemplifications in all points and not restrictive. The scope of the present invention is shown not by the above description but by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

The ring 1 described in the embodiment was tested by the following drop impact test method, and the results shown in Table 1 were obtained. The brazing material is PT-2.21% by weight B, PT-4.1.
Each test sample was prepared by changing the brazing width H by using the one having 2 wt% Si and PT-1.10 wt% B-2.10 wt% Si. (Method) (1) As the test sample, a simple Komaru ring (width 3 mm, instep height 1.5 mm) # 12 expanded in size to # 15 was used. This time, we tested with a sample with expanded size, but for example, when changing the size from # 12 to # 7,
A size-reduced one is also acceptable. (2) In the drop impact test, the ring was naturally dropped from a height of 2 m onto a concrete floor. (3) The falling form of the ring was such that the ring was set up on the floor and the brazing part was faced downward so that the brazing part was strongly subjected to a drop impact. (4) In the inspection, the presence or absence of occurrence of cracks or the like was visually observed.

[0042]

[Table 1]

As is clear from the results of the drop impact test (Table 1), the brazing width was 0.20 for all materials.
In the case of mm, the number of drops until cracking is several times, but by setting the brazing width to 0.10 mm or less, the number of drops before cracking is significantly increased and brazing strength is increased. You can see that it will improve. In particular, when the brazing width is 0.02 mm or less, it can be seen that, in any material, the number of drops until cracking is 100 times or more, and the brazing strength is further stabilized.

[0044]

According to the invention described in claim 1, the melting point of the brazing material can be remarkably lowered compared with the melting point of platinum alone (1776 ° C.). Further, in the case of a high-purity platinum alloy, the melting point thereof is a value close to the melting point of platinum alone, so that the main body portion is highly pure (the platinum content is 99.7% by weight) as in the invention of claim 2. Even if the heat of the melted brazing material is conducted to the main body when it is formed of the platinum alloy described above), the platinum alloy forming the main body can be prevented from melting and its shape can be maintained. . Therefore, brazing can be performed easily without worrying about thermal deformation of the accessory itself, and therefore, the main body is composed of a plurality of members, and when the plurality of members are joined (for example, at the time of manufacturing or (At the time of restoration) and the main body is a single member,
It is possible to improve the work efficiency when joining two different parts of the member (for example, when the size of a ring or the like is adjusted).

Further, in general, Pt-B (platinum-boron)
Alloy, Pt-Si (platinum-silicon) alloy, Pt-B-
The Si (platinum-boron-silicon) alloy is an intermetallic compound that forms an ordered lattice and is a very brittle and poorly-utilized alloy because of its high covalent bond property, but the brazing width is 0.1 mm or less. In the range, that is, when the brazing material is thinned, it becomes difficult to apply an external force to the brazing material, and the brazing strength can be stabilized. Further, it is possible to prevent the brazing material from being included in the test piece collected from the accessory during the quality test. Also, even if the test piece includes a brazing part,
The proportion of the brazing material in the test piece is also very small compared to other parts of the test piece (platinum alloy forming the main body), and the platinum content is at least 94.1% by weight or more. Therefore, the platinum content of the main body is set to "Pt100
By setting it slightly higher than the lower limit (99.7% by weight) of the certification standard of 0 ", it is possible to determine that the platinum content is less than 99.7% by weight even for the test piece containing the brazing material. In addition, since the brazing material itself is a high-purity platinum alloy and the brazing width is set to a very small value compared to the body, the hue of the body and the brazing material is The difference between can be made inconspicuous.
Even the platinum accessory after brazing can pass the quality test of "Pt1000". In other words, "P
Even if the platinum accessory having the quality of t1000 "is brazed for repair or size modification, the quality of" Pt1000 "can be prevented from being deteriorated.

According to the third aspect of the invention, when a breaking stress such as an impact acts on the accessory, the cushioning member can absorb and relax the breaking stress. Therefore, when an unsteady stress is applied to the main body portion, cracks are likely to occur in the brazing material due to the high toughness of the main forming portion, but by interposing a buffer member having lower strength and toughness than the main forming portion, The stress is not concentrated on the brazing material portion, and the generation of cracks can be prevented. Further, even if the accessory does not include a cushioning member in advance, it is possible to newly attach the cushioning member later.

[Brief description of drawings]

FIG. 1 is a perspective view showing a ring according to an embodiment of the present invention.

[Explanation of symbols]

1 ring (platinum jewelry) 2 body 3 Main molding part 4 cushioning member 5 brazing material 6 joints

Claims (8)

[Claims] 1. A platinum accessory having a joint by brazing, comprising a main body made of a platinum alloy and a brazing material for joining a part of the main body to each other, wherein the brazing material is 95.6 wt% platinum. % Or more of boron 1.
A platinum alloy containing 3 wt% or more and 4.4 wt% or less, and a platinum alloy containing 94.1 wt% or more of platinum and 3.4 wt% or more and 5.9 wt% or less of silicon.
A platinum accessory, which is one of the platinum alloys obtained by mixing the two, and has a brazing width of the joint portion set to a range of 0.1 mm or less. 2. The platinum accessory according to claim 1, wherein the main body is made of a platinum alloy having a platinum content of 99.7% by weight or more. 3. The platinum accessory according to claim 2, wherein the main body has a platinum content of 99.7% by weight or more and silicon, magnesium, zirconium, aluminum, calcium, and thorium as additive elements. One or more elements selected from
A main forming part formed of a platinum alloy to which boron is added,
A buffer member formed of a platinum alloy having a platinum content of 99.7% by weight or more, which is softer than the platinum alloy for forming the main forming portion, and between the parts to be joined of the main forming portion. The platinum accessory is characterized in that the cushioning member is interposed in, and a part of the main molding portion and the cushioning member are brazed with the brazing width. 4. At least 95.6% by weight of platinum and 1.3% of boron.
Platinum alloy contained in a proportion of not less than 4% by weight and not more than 4.4% by weight, and at least 94.1% by weight of platinum and 3.4% by weight of silicon
It is made of any one of a platinum alloy containing 5.9% by weight or less and a platinum alloy in which both are mixed, and the brazing width is in the range of 0.1 mm or less. A brazing material characterized by being used as described above. 5. A brazing method using a brazing material according to claim 4, wherein the member brazed by the brazing material is a platinum alloy having a platinum content of 99.7% by weight or more. A characteristic brazing method. 6. The brazing method according to claim 5, wherein the member to be brazed has a platinum content of 99.7% by weight or more and silicon as an additive element.
A brazing method comprising a platinum alloy to which boron and one or more elements selected from magnesium, zirconium, aluminum, calcium and thorium are added. 7. The brazing method according to claim 6, wherein, when brazing the joint portions of the members, the joint portion is softer than the member and has a platinum content of 99.7% by weight. A brazing method characterized in that the cushioning member formed of the platinum alloy is interposed, and the cushioning member and the joint portion are brazed by the brazing material. 8. The brazing method according to claim 7, wherein the member is a ring, and when the ring is resized, the ring is cut so as to open, and the ring is compared with the length of the size to be fixed. Then, when the combined length of the length of the cushioning member and the length of the ring that has been cut and opened is longer, remove a part of the ring from the cut end of the ring, The cushioning member is sandwiched between the cutting ends, and one cutting end of the ring and one end of the cushioning member corresponding to the cutting end are brazed together, and the other cutting end of the ring. A brazing method, characterized in that a part is brazed to the other end of the cushioning member corresponding to the cut end.