JPS5976801A - Production of sintered hard alloy for decoration - Google Patents

Abstract

PURPOSE:To produce a sintered hard alloy for decoration having excellent appearance by binding sintered hard alloy particles consisting essentially of carbide and nitride of specific transition metals and WC and a compd. of the same kind as said metal having a different color, and subjecting the sintered body to grinding and etching. CONSTITUTION:One or >=2 kinds of particles having about 0.3-3mm.phi composed of a sintered hard alloy consisting essentially of carbide and nitride of 4a, 5a group transition metals of periodic table and WC or the compd. thereof are used, and the above-described compd. having a different color tone is added to said particles. Both particles are bound by a metallic binder component and are sintered. The sintered body is subjected to grinding, lapping, and electrolytic or chemical etching. The compd. used of a silver white color is TiC, ZrC, HfC, VC, WC, etc. and the compd. of a golden color is NbC, TaC, TiN, ZrN, HfN, VN, NbN, TaN, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a decorative cemented carbide with increased added value by creating an unprecedented appearance.

In general, the main properties required for decorative alloys are that they have good surface gloss and maintain their appearance for a long time, that they do not corrode or discolor depending on the environment in which they are used, and that they have a characteristic color tone and that the material itself is decorated. It is required that there is a value.

Conventionally used decorative alloys include WO type and TaC type cemented carbide, old alloys, Co alloy type hard alloys,
There are gold alloys such as 14K and IOK alloys, and various plating swirls on stainless steel and brass, and these alloys are widely used in jewelry such as necklaces, earrings, rings, bracelets, watch cases, and lighters. There are 9 people. However, as decorative requirements become more diverse, new decorative alloys are required that, if possible, can produce new images that cannot be produced with the above-mentioned materials.

The present invention solves this problem by creating a pie-colored or tri-colored cemented carbide instead of the conventionally available only colored cemented carbide. The specific contents are as follows.

The present invention provides particles of 03 to 3 snφ made of carbides and nitrides of transition metals of groups 4α and 5a of the periodic table, tungsten carbide (hereinafter abbreviated as compound), or a cemented carbide mainly composed of the above-mentioned compounds. The above-mentioned alloy-based compounds and metal binder components with different grains and colors are added to the mixture, sintered, ground and wrapped, and then electrolyzed, electrolyzed or The present invention attempts to produce a decorative cemented carbide with an unprecedented appearance using a method for producing a decorative cemented carbide, which is characterized by chemical corrosion. The present invention uses carbide or nitride, or a cemented carbide made of carbide or nitride as a main component, to approximately 03 to 6iI.
The particles of IIφ are mixed with carbide or nitride powder of a different color tone and a metal component as a binder and then sintered, and the contrast between the particle layer and the cemented carbide layer that becomes the matrix layer is sharpened. It is characterized by etching to make it look better. In cemented carbide, when particles of different colors are mixed and sintered, the difference between the two hues is clearly visible on the normal ground surface and the polished cast surface.
tf output IC<<, the decorative effect increases as more contrast is added. By adding this etching process, it has become possible to easily form a new concept of carbide, for example, which is a combination of senshiro and kogansha.

Of the carbides and 9ides of transition metals in Groups 4a and 5a of the periodic table and tungsten carbide described in the present invention, white compounds such as TiO and ZrO.

Hlo, VC! , WC, etc., and the golden-colored compound is N
ba, Tao, Ti1J, zrN, HfN, vN, Nb
N, TaN, etc.

The alloy according to the present invention will be explained below using examples.

Example 1 As a raw material powder, Ta0 particles with an average particle size of 07 mm were mixed with WO powder with an average particle size of 13 μm and a binder metal with an average particle size of 3 μm so as to have a final component composition showing the first PK, and the mixture was mixed in a vacuum atmosphere. The alloy of the present invention was produced by sintering at 1300 to 1400°C for 1 hour and then hot isostatic pressing at 1350°C and 500 atm. This alloy was subjected to rough grinding using a diamond grinder and lapping finishing using a lapping machine. When this alloy was immersed in the following etching solution at 90°C for 10 minutes, WO part 1
The portions were colored black, and the T (10 grain portions were also satin-finished, giving a more golden image, making it possible to form a cemented carbide with gold grains dispersed on a black background.

Etching solution KA Fe (ON)a 3 gKOH10
g 1 (20100 m1) The alloy prepared in this way was heated to 40°C ± 2°C using artificial sweat (P, H = 4.7) as a corrosive liquid in accordance with the 1 day O (International Standardization Organization) standard. A corrosion resistance test was conducted by immersing the lower half of the mirror-polished specimen in the artificial sweat held in the artificial sweat for 24 hours and observing whether clouding occurred on the polished surface, and no problems such as discoloration occurred. After manufacturing a watch body using the above alloy and stuffing the cover glass, case back, etc., it will not cause problems such as cracking up to a height of 1.0 m even if it falls onto a comforter. This alloy had no problems in corrosion resistance or impact resistance, and had a hardness of Hυ=1300 or more, so no scratches occurred in practical use. In this way, although it has various properties equivalent to conventional cemented carbide, this alloy has
We were able to create a new image of cemented carbide, which is surrounded by o-co-cr type pot-white cemented carbide.

Example 2 As raw material powders, WO powder with an average particle size of 2oμm and 'rO
ttm's 8wt 4 Nj, 2wt% cr
The alloy was subjected to powder compaction, sintering, and hot isostatic pressure under the same conditions as in Example 1, and the resulting alloy was ground to an average particle size of 2×, and to the coarse particles was added TIZc with an average particle size of 1.8 μm and an average particle size of When a 3 μm metal binder is mixed to have the final component composition shown in Table 2 and sintered under the same conditions as in Example 1, from K,
An alloy according to the invention was produced. This alloy was polished under the same conditions as in Example 1, and then etched. Etching conditions were as follows: processing was carried out at 20° C. for 10 minutes in a solution containing the following components.

Etching liquid components H20230rn, L NaOH6Q J120 60ml.

This cemented carbide was evaluated in the same manner as in Example 1.

As a result, there were no problems in terms of corrosion resistance, impact resistance, hardness, etc. This alloy has the same characteristics as conventional cemented carbide, but the WC-based silver-white cemented carbide grains are etched in a slightly black color, with satin-like frost surrounding them, and the C-based golden-yellow cemented carbide. Gato! After seven years, we were able to create a new color tone of cemented carbide. When this alloy was used in a pendant, it was possible to use it as a new material with an unprecedented sense of luxury.

Example 3 As raw material powder, 160 particles with an average particle size of 0.3 to 3X,
TiN particles and HfN particles with an average particle size of 1.5 μm
Powder and TzΔ powder with an average particle size of 1.8 μm and an average particle size of 3
．． A 0 μm metal binder was sintered in the same process as in Example 1 to create a cemented carbide. This alloy was polished under the same conditions as in Example 1, and then treated under the following conditions in an etching solution with the following components. Anode Sample @ Italy Platinum Voltage 7 ■ Time 1 minute This cemented carbide was evaluated in the same manner as in Example 1.

As a result, there were no particular problems with corrosion resistance, impact resistance, cirrhosis, etc.
We were able to create a new alloy in which Tσc, TiN, and HfN particles with a slightly different golden color are dispersed in TzO-based white cemented carbide, while having the same properties as conventional cemented carbide.

Example 4 As raw material powder, WC particles with an average particle size of 1.0 Tsuru, TiN, NbC, and Va powders with an average particle size of 1.5 μm, and a metal binder with an average particle size of 3 μm were used as the final components shown in Table 4. The alloy of the present invention was manufactured by mixing the materials so as to have the same composition, and performing sintering and etching treatment as described below in the same steps as in Example 1. This also made it possible to produce an alloy having properties similar to those of Examples 1 to 3, in which silver-white WC particles were surrounded by golden-colored TiN-based cemented carbide.

Etching liquid Na0N 10g J (2090m1 Etching condition temperature 25℃ Anode Sample (for etching) Negative voltage 6V Time 7 minutes As mentioned above, the cemented carbide according to the present invention has all the characteristics required for decorative parts. Not only was it possible to create a double-colored cemented carbide with an appearance that was unprecedented.

Table 1 Table 2 Third garment Table 4 that's all Applicant: Shuwa Seikokin Co., Ltd.

Claims (1)

[Claims] Carbides and nitrides of transition metals in groups 4α and 5α of the periodic table, and tungsten carbide (hereinafter abbreviated as compounds)
Alternatively, one or more particles made of cemented carbide containing the above-mentioned compound as a main component are used, the above-mentioned compound having a different color tone from the particles and a metal binder component are added thereto, sintered, and then grinding or A method for producing a decorative cemented carbide, which comprises lapping and then electrolytic or chemical corrosion.