JPS58202995A - Brazing alloy of low karat gold having golden color - Google Patents

Abstract

PURPOSE:To provide a brazing alloy of low karat gold having high strength, a golden color, resistance to corrosion and a good brazing characteristic, by regulating the kinds and contents of the alloy elements to be compounded together with Au specifically. CONSTITUTION:A brazing alloy of low karat gold consists of 30-40% Au, 25-45% Ag, 5-15% In, 15-25% Cu, 1-15% Zn, and has <=700 deg.C melting temp. Said alloy has the golden color equivalent to the color of a conventional brazing alloy of 14 karat gold, excellent corrosion resistance and mechanical strength and a good brazing characteristic at a low m.p.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low karat gold solder alloy, and more particularly, the present invention relates to a low karat gold solder alloy, which exhibits a golden color similar to that of a high karat gold solder alloy despite having a low gold content, and a low gold color comparable to that of silver solder. It relates to a low carat gold solder alloy having a melting point.

Ordinary gold solder alloys have a base alloy of gold, silver, steel, and zinc, and incorporate appropriate amounts of indium, tin, Ga U17A, cadmium, etc. to lower the melting point and improve flowability. , or to improve brazing strength and mechanical brightness. Among these cypress gold solder alloys, those commonly used for dental and decorative purposes are, for example,
As shown in Publication No. 139620 and Publication No. 55-103298, it is a 14-karat gold brazing alloy with a gold content of about 584 (the same shall apply hereinafter), and these have excellent brazing properties. It has a beautiful golden color and good corrosion resistance, so it can be said to be extremely suitable for the above-mentioned uses. However, the price of gold has been increasing rapidly recently, and in order to cope with the current situation, research into low-karat gold solder alloys with a reduced gold content is being actively pursued. 58-29
As seen in Japanese Patent No. 225, silver solder alloys and the like have been provided in which the gold content is significantly reduced and the silver content is increased. However, silver solder alloys have a gold content of 30~
In low carat gold solder alloys, which are kept to about 45 mm, brazing properties can be improved by adjusting the alloy elements and their blending ratio, but the characteristic characteristic of gold alloys is diminished and the It has the fatal disadvantage of reduced corrosion resistance, and the value of the component as a noble metal brazing filler metal is seriously impaired. Moreover, the melting point of known low carat gold solder alloys is generally 720 to 800°C.
Since the degree of brazing is relatively high, improvement in brazing properties is also required.

The inventors of the present invention have focused on these circumstances, and have developed a low-carat gold solder alloy that has excellent strength, has a golden color comparable to a 14-way rat gold solder alloy, has a hardness to eat, and has a low melting point. Since then, we have been conducting intensive research to develop a gold brazing alloy with good brazing properties. The present invention was completed as a result of such research, and its composition is as follows:
1. Silver: 25 to 40 q&, indium = 5 to 15 ml, copper: 15 to 25 scratches, and zinc: 1 to 15 ml, and the gist is that the melting point is about 700'C or less.

In the following, the types of alloying elements and compounding system are determined in the present invention. The total amount to be explained is 30 to 40. This is an essential element for a gold solder alloy, but in order to maintain the original purpose of reducing costs by reducing carat weight, 40% was set aside as an upper layer.

- The lower limit of 10,000 was set to ensure a golden color and compatibility comparable to 14 carat alloy, and for 30 carats, other alloy components as described below were adjusted appropriately. Even in this case, you will not be able to obtain the golden color and the 11 degradability of l-plus '.

m: 25-40% Silver is an element that alloys very well with copper in the case of gold alloys, but the composition range was limited by the minimum required amount of gold and Ike's indium, copper, and zinc. When added, the content of silver is in the range of 9111, and is an element necessary for reducing the karat of gold alloys.

Indichem = 5 to 15 width The most important alloying element in the present invention, containing gold
It is an essential element that exhibits a stable golden color even when the number 4 is low, lowers the melting point, and improves brazing properties, and effectively produces these effects.
Yooyo, gayuwaiiga, ga 1i. Moreover, if it is too large, the alloy becomes brittle, so it is necessary to keep it below 15%.

Copper: It is an extremely important element to improve the strength of 15-25 alloys, and also has the effect of reducing the flowability.
Must contain 5 or more. However, if the temperature exceeds 25 minutes, the melting point becomes flat, the food becomes less palatable, and it loses its golden color in a short period of time.

Zinc: 1~15 meters It has a deoxidizing effect and a significant melting point lowering effect.

In particular, the present invention has great expectations for the latter effect,
The content of other alloying elements also depends on the content, but in order to obtain a melting point of approximately 700°C or less, it is necessary to contain at least one range. However, when the temperature exceeds 15%, the alloy becomes noticeably brittle.

Although the contents of the individual constituent elements of the gold solder alloy according to the present invention are as described above, it is not necessarily appropriate to define the effects of these constituent elements only by their respective contents, so it may be difficult to determine the actual formulation. When considering the interaction of all the constituent elements, the optimum i[
should be selected and decided.

Next, in order to clarify the structure, function, and effect of the present invention, all differences will be explained by comparing it with a known gold solder alloy.

Table 1 shows the free composition, bath melting temperature 1a degree, and color tone of the known surplus solder alloy and the uninvented gold solder alloy.

Alloy 41: Gold alloy is 14 karats) & part of the gold in the brazing alloy'! ! - MItF with Pd substitution and Ni added instead of Ag! It will be 5L, but 14
The golden color characteristic of karat gold brazing alloy is weak, and the melting temperature is as high as about 1000°C, so brazing properties are poor.

Regardless of the K, this alloy is classified as a medium-karat gold solder alloy, has a high gold content, and should be distinguished from the low-karat gold solder alloy of the present invention.

Alloy 42.8 is a general 14fjy gold solder alloy, and has a relatively low melting temperature and a golden color, which is a natural result of its high gold content. Alloy 42 contains a small amount of in as an alloying element, but this is mainly KfiIt waxy.

It is blended for the purpose of adjusting the melting point, and since it is originally golden in color, we do not expect the 8M ability to suppress the decline in golden color at all, and such a function itself is not expected of this alloy. Case - No cutting required.

Match 4! ! ! Mu4: The golden calyx rate was suppressed and the silver content was significantly increased. It is a type of brazing alloy, and although it is priced at ¥, it does not have the piercing color of Hotaru Tokuiku, and is a product of 1IiI in terms of appearance and performance.
ia is low. In this example as well, 9 pieces of In are included as an alloying element, but I cannot be proud of the fact that I expected it to have the function of imparting a golden color.

Alloys 5, 6, and 7: The base metal 1r straw is a low-carat surplus brazing alloy similar to that of the present invention, and the molten HA tm degree is relatively low and the brazeability is good, but the gold color The product value is low because it does not have

Alloy 48: Although it contains an amount of gold comparable to that of a 14-way rat gold solder alloy, it does not have a golden color and its commercial value in terms of appearance is low. From this example, it can be seen that even if the Kanakura f.

Alloy / I69, 10: Both are low carat gold solder alloys that satisfy the requirements of the present invention, and despite having an extremely low gold content, they exhibit a golden color similar to that of 14-karat gold products.
Furthermore, the granite braiding degree also shows a low value of 700'C or less. When this sample alloy was subjected to a discoloration test and a brazing test as described later in the history, excellent results were obtained in both cases.

[Discoloration test]

Each wax alloy was immersed in a 0.1% aqueous sodium sulfide solution at 37°C for 72 hours, and the presence or absence of surface discoloration was examined (JIS-T6107), and no discoloration was observed. . This experimental result proves that the alloy of the present invention is also excellent in corrosion resistance.

[Brazing test]

J
After brazing in accordance with IS-T6107, a tensile test was conducted. As a result, there was no peeling of the solder parts, all of them broke at the base metal part, and the mechanical strength was 5°kg f, -Y, 1":1:. The results of the two experiments prove that the gold brazing alloy of the fourth invention is superior in both brazing properties and mechanical strength.

The present invention has been roughly constructed as described above, and by strictly specifying the types of alloying elements mixed with gold and the content of thatch, even though it is a low carat gold brazing alloy, It has become possible to provide a gold solder alloy that has an appearance (golden color), corrosion resistance, and mechanical strength comparable to gold solder alloys, has a low melting temperature, and has excellent brazing properties.

Therefore, the cost of materials required for brazing, hole filling, etc. of various polished products using gold alloy can be significantly reduced. In addition, the most characteristic alloying element in the alloy of the present invention is indium, which is harmless to the human body and does not contain harmful elements like conventional gold alloys containing cadmium, so it is suitable for dental use. It is also extremely useful.

Source: Sankin Kogyo Mashiki Company

Claims (1)

[Claims] ill gold: 30-40 (same for weight 11 and below), silver = 25
~ 40 scratches, indium: 5-15 yen, copper 2 15-25 yen, zinc: 1-15 yen si, low karat gold with a golden color, characterized by a temperature of about 700°C or less. Brazing alloy.