JPS5941401A - Manufacture of ornamental alloy - Google Patents

Abstract

PURPOSE:To obtain the new ornamental alloy in which particles having a different color tone are dispersed, by sintering the mixture of ceramics particles having metallized surfaces and a predetermined particle size with a powdery metal body of different color having a melting point lower than that of said particles. CONSTITUTION:The surfaces of ceramics particles of 0.2-3mm. in size are metallized by a method such as electroless plating or metal paste baking. Said metallized particles are mixed with a powdery metal body having a melting point lower than that of the ceramics particles and a different color tone, and then sintered. Thus, the new ornamental alloy in which the particles having the different color tone are dispersed is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new metal alloy with increased added value by creating an unprecedented appearance.

In general, the main properties required for decorative alloys are: (1) good surface gloss, (2) good eating ability and no yellowing, and (3) distinctive color tone. .

Decorative alloys that have been widely used in the past include w'c thread, Ta['3 series cemented carbide, Ni alloy and CO thread hard alloys, 18, 14, and 1oK'# gold. There are also stainless steel and brass with various plating treatments, and these are widely used in jewelry such as necklaces, earrings, rings, press threads, watch cases, and lighters. .

However, as decorative requirements become more diverse, there is a demand for decorative alloys that simultaneously satisfy requirements (1) to (3) above if possible, and that can also create a new image that has never existed before. ing.

The present invention solves this problem and relates to a method for producing a 7Jλ bicolor alloy that cannot be obtained by conventional production methods. When making conventional decorative alloys multi-colored, (i. Partial gold plating on white alloys ■ Partially embedding colored paint in various alloys, ◇) (h. Gold in different tones) Methods such as crushing alloys have been used, but when manufacturing decorative parts, there are many design restrictions and there are problems in that the process is not regular.

The 4P invention solves this problem by dispersing colored ceramics into metal phases of different tones by powder metallurgy, and creating a new decorative alloy in which particles of different colors are dispersed. was completed.

The characteristics of the present invention are to improve the wettability between the ceramic and the grain [-1] and to improve the bonding strength at the interface, and to prevent the occurrence of cranks due to the difference in expansion rate between the ceramic particles and the metal during sintering. To prevent this, the ceramic surface is metallized. The ceramic particles used in the present invention must have an average particle diameter of 02 to 3 mφ in order to produce a decorative effect. Also, if it exceeds 3 φ, it will be too thick and will not suit the image as a decorative part, so it is best to use the particle size within the above range.The condition of the ceramic surface is that the X density is about 98%. If the following porosity is used, a particularly excellent 'fC bonding effect with the metallized layer can be produced.If the fc-density is 98% or more, d:, since there are few bores on the surface of the sphere, the metallized layer The bonding strength with
Also, if the bonding strength is 90% or less, U:# can be obtained, although it cannot withstand practical use after polishing after bonding, but the bonding force is very strong. Furthermore, when it comes to metallizing ceramics, the old tube differs depending on the combination with the old ceramic tube, but generally speaking, the optimal thickness is between 0.1 μm and 5 μm. However, the disadvantage is that the metallized layer has a bonding effect with the metal layer, is difficult to maintain, has poor wettability, and is prone to cranking during sintering.On the other hand, if the metallized layer is deposited with a thickness of 5 μm or more, the cost required for metallization becomes high, and ,
Internal bores are likely to occur after sintering due to occluded gas in the metallized layer.

In this combination, it is appropriate that the volume of the ceramic be 20 to 50%; if it is less than 20%, the effect of dispersing the ceramic is difficult to be obtained, and if it is more than 50%, the toughness is reduced and problems tend to occur in practice.

Examples will be described below.

Example 1 A paste containing a mixture of Mo and Mn at a ratio of 8:2 was applied to the surface of white particles of A1.2o3 (purity 95%) of 0.7Bφ, and a paste of 1300 to 1500 was applied in a moist N2 gas.
Sintering was carried out between ℃. Containing 20wt% of this metallized ceramic, the remaining N1 powder with an average particle size of 5μm and C
R powder was mixed at a ratio of 8:2 and compacted. After sintering this in vacuum at 1351]°C 1 hour mj,
Hot isostatic press at ℃ 500 atm t 1ljQ and A. This alloy was subjected to rough cutting and Lambuka R1 processing using a diamond grinding machine. Artificial sweat (PH=4.
7) as a corrosive liquid, the lower half of the mirror-polished specimen was immersed in the artificial sweat kept at a temperature of 40°C ± 2°C for 24 hours to check whether or not spiders would form on the polished part. When we conducted a corrosion resistance test to observe,! There were no problems with the samurai, such as discoloration.

Furthermore, if the entire body of a one-on-one vehicle is fabricated using the above-mentioned pot, and a cover glass, back cover, etc. are assembled, and the RC falls onto concrete, no problem noises such as scree will be produced up to a height of 1.5 m. There were no practical problems. Although it has various characteristics sufficient to be used as a decorative alloy, this combination creates a decorative alloy with a new image, with a silvery-white metal layer surrounding the white ceramic particles. I was able to do that.

Example 2 Pigeon 02-50 wt% Ti of 0.5-1.5 wnφ
0.1μ of Ni is applied to the surface of black O particles by electroless plating.
m, and Cr was formed thereon to a thickness of 0.5 μm by electrolytic plating.

fl-, 1300-1500 in humid N2 gas
Sintering was carried out between ℃. Furthermore, this ceramic particle is
Activated in a hydrochloric acid solution, the 24-layer membrane 7' (0.5 μm
provided. This particle "130 wt%, here K Au-12
, 5wt%Ag-12, 5wt%Ou powder with an average grain size of 2.11m was added to 7wt% of binder, and sintered at 900°C for 1 hour in a vacuum atmosphere. Hot isostatic pressing was carried out at 500 atm. This alloy was completely polished under the same conditions as in Example 1 and evaluated in the same way. φ As a result, no particular problem occurred in corrosion resistance, impact resistance, etc. fc.

While this alloy has various properties equivalent to those of conventional cemented carbide, it was able to create a new complex color tone in which Kanakura♀ surrounds Al2O2-T i C-based black ceramic. By using this fusion υ as part of a pentuft, it was possible to use it as a new material with an unprecedented sense of luxury.

that's all Applicant: Suwa Seiko Co., Ltd. Agent Patent Attorney Mogami

Claims (1)

[Claims] After the surface of the ceramic particles of 0.2 to 3 nφ is metalized in advance by electroless plating method, metal paste firing method, etc., the ceramic particles are coated with the ceramic υJ.
A method for producing a decorative alloy comprising mixing and sintering ceramic particles and powder in a pot having a low melting point and a high color tone.