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Tungsten alloy used for jewelry and ornamental article, and preparation method thereof

A technology of tungsten alloy and jewelry, which is applied in the field of hard alloy products and its preparation, and can solve problems such as dangerous prices

Inactive Publication Date: 2008-07-09
刘嵘
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Fourth, cobalt is an element that is prone to radioactivity and is extremely dangerous for jewelry. Its price is also higher than that of nickel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064]Using 1.5um tungsten carbide 81% (wt), nickel 18% (wt), the balance Tac, Nbc, through wet grinding, precipitation, drying, mixing molding agent, drying, sieving, pressing, sintering (1400 ℃). Prepare tungsten alloy jewelry material. The hardness HRA is 85. Porosity A02, B00, C00. The grain size is 0.8um and the density is 13.8g / cm 3 , Grinding and polishing, tungsten black shines. Grinding on the rough cement surface, the bright surface will be fuzzy and foggy, and there will be slight scratches, and the abrasion resistance is slightly poor. It is made into a φ63×0.6 disc, which falls freely at a level of 1.2m without being broken, and has good anti-drop performance. After grinding and polishing the material, put it in an oven at 40°C on the simulated human sweat, and after 48 hours of human sweat evaporation test (commonly known as "artificial sweat test"), the brightness of the jewelry becomes dark. The surface is wet and foggy and cannot be scrubbed off. The mat...

Embodiment 2

[0066] Use 1.2um-1.5um tungsten carbide 84% (wt), nickel oxyhydroxide 14% (wt), and balance chromium carbide and tantalum carbide. After wet grinding, mixing with glue, pressing and sintering (1410℃±10℃). The prepared material: hardness HRA87-88, density: 14.1±0.1g / cubic centimeter, grain size 0.8-0.6um, porosity A02, B00, C00. Grinding process, black and shiny after polishing, rubbing on the rough cement surface, the bright surface is not damaged. Made into a circular piece of φ63×0.6, it can be dropped freely at a level of 1.2 meters without any damage. After 40 ℃, 48 hours "artificial sweat" test, no erosion. According to the radioactivity test, it is harmless to the human body in zero-distance contact. The material has certain corrosion resistance, good resistance to falling and abrasion. It is suitable for making all kinds of accessories, and has a good effect of accessories. The material is non-magnetic, and it will not affect the accuracy of travel time when used as ...

Embodiment 3

[0068] Using 1.2um tungsten carbide 85% (wt), nickel oxyhydroxide 12% (wt), chromium carbide 2%, tantalum carbide, niobium carbide, molybdenum carbide 1% (wt), after wet grinding, mixed with molding agent, press molding, stripping Molding agent, material obtained by sintering (1420°C±10°C), hardness HRA90±0.2; density: 13.9-14.0g / cm 3 ; Grain size 0.6um, porosity A02, B00, C00. After grinding and polishing, it will be black and bright, and when rubbed on the rough cement surface, the bright surface will not be damaged. Made into a φ63×0.6 disc, it can be dropped freely from a level of 1.2m without any damage. After 40 degrees Celsius, 48 ​​hours "artificial sweat" test without erosion. Radioactive detection is harmless to human body. The material has good corrosion resistance, oxidation resistance and high hardness. The brightness is very good, and it is very good to make all kinds of accessories that will never wear and rust. The material is non-magnetic, and it will not a...

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Abstract

The invention discloses a tungsten alloy for jewelry and decorations and a method for preparation. According to the weight percentages, the compositions of the invention comprise 80-94 percent of tungsten carbide, 6-16 percent of nickel, and 0-4 percent of one or more lutetium, tantalum, niobium, vanadium and strontium. The method for preparation is that the above compositions are mixed through wet milling, adding forming agent, compression molding, removing forming agent and sintering and the like according to proper proportion, and the sintering temperature is 1400-1440 DEG C. Tungsten alloy for jewelry and decorations has high hardness, strong wear resistance, black and bright color, corrosion resistance, oxidation resistance, sweat resistance and no radioactivity, is capable of contacting with human bodies without harm in zero distance, belongs to a best novel decoration material, and has wide market prospect.

Description

Technical field: [0001] The present invention relates to cemented carbide products and their preparation methods. In particular, tungsten carbide is used as hard phase, nickel is used as metal binder, chromium, tantalum, niobium, vanadium, strontium, molybdenum or their carbides are used as additives for jewelry and hard alloys for jewelry and its preparation method. Background technique: [0002] At present, most tungsten alloys are used in industry. With the improvement of people's living standards and the demand for aesthetics, the materials of jewelry and accessories have developed from traditional jade, gold, silver, palladium, platinum and other precious metals to the use of tungsten alloys. Material. U.S. Patent No. 6,928,734 reported a method for preparing ring jewelry with tungsten alloy. The patent discloses that the composition measured by weight percentage is: tungsten carbide 50-90; binder nickel 2-10; cobalt 1-2 and chromium carbide 0.5-3. [0003] It can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 刘嵘
Owner 刘嵘
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