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Synthetic moissanite gemstone imitating tourmaline and preparation method thereof

A technology for synthesizing moissanite and moissanite, which is applied in chemical instruments and methods, single crystal growth, polycrystalline material growth, etc., can solve the problem that synthetic moissanite has not been used to make imitation tourmaline ornaments, etc.

Active Publication Date: 2016-11-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the price of tourmaline on the market rising year by year, the research and development of imitation tourmaline materials has gradually become a hot spot, but synthetic moissanite has not been used to make imitation tourmaline jewelry

Method used

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  • Synthetic moissanite gemstone imitating tourmaline and preparation method thereof
  • Synthetic moissanite gemstone imitating tourmaline and preparation method thereof
  • Synthetic moissanite gemstone imitating tourmaline and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1, a kind of synthetic moissanite single crystal imitating green tourmaline, preparation method is as follows:

[0049] The 4H-SiC seed crystal is placed at the bottom of the upper cover of the crucible, and the high-purity SiC powder is placed at the bottom of the crucible. The pressure of the growth chamber is 50-100mbar, and the temperature is raised to 2200-2300°C, and the SiC powder at the bottom is decomposed into Si and SiC 2 and Si 2 The three main gas phase components, C, are transported to the surface of the seed crystal at a lower temperature, and through deposition, the crystal grows continuously. During the growth process, by passing an appropriate amount of N 2 , so that the concentration of N doped in 4H-SiC reaches 1×10 19 / cm 3 , to obtain grass-green moissanite single crystal.

[0050] When the above-mentioned single crystal is cut and ground into rectangular gemstones or emerald-shaped faceted gemstones with the growth surface as the t...

Embodiment 2

[0051] Embodiment 2, a kind of synthetic moissanite single crystal imitating polychromatic tourmaline, preparation method is as follows:

[0052] The 4H-SiC and 15R-SiC symbiotic seed crystals (green and yellow coexistence) were placed at the bottom of the upper cover of the crucible, and the high-purity SiC powder was placed at the bottom of the crucible. The pressure of the growth chamber is 50-120mbar, and the temperature is raised to 2000-2500°C, and the SiC powder at the bottom is decomposed into Si and SiC 2 and Si 2 The three main gas phase components, C, are transported to the surface of the seed crystal at a lower temperature, and through deposition, the crystal grows continuously. During the growth process, by passing an appropriate amount of N 2 , so that the concentration of N doped in the crystal reaches 2×10 19 / cm 3 , to obtain grass-green-yellow moissanite crystals. The emerald cut is preferred to cut and grind the above-mentioned single crystal to obtain ...

Embodiment 3

[0054] Embodiment 3, a kind of synthetic moissanite crystal imitating polychromatic tourmaline, preparation method is as follows:

[0055] The 6H-SiC seed crystal is placed at the bottom of the upper cover of the crucible, and the high-purity SiC powder is placed at the bottom of the crucible. The pressure of the growth chamber is 50-120mbar, and the temperature is raised to 2000-2500°C, and the SiC powder at the bottom is decomposed into Si and SiC 2 and Si 2 The three main gas phase components, C, are transported to the surface of the seed crystal at a lower temperature, and through deposition, the crystal grows continuously. In the early growth process, by passing an appropriate amount of N 2 , so that the concentration of N doped in 6H-SiC reaches 2×10 19 / cm 3 , a dark green moissanite single crystal was obtained; N was stopped in the later stage, and the concentration of residual N impurities was about 2×10 17 , the color of moissanite grown in the later stage is li...

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Abstract

The invention relates to a synthetic moissanite crystal imitating tourmaline and a preparation method thereof. The tourmaline types include green tourmalines and multicolored tourmalines. Green moissanite single crystal similar to green tourmaline can be obtained by doping N impurities into the growth system of 6H‑SiC and 4H‑SiC. The invention also provides a preparation method for the imitation multicolor tourmaline. The green and multi-color imitation tourmaline moissanite material of the present invention has pure color, high refractive index, high hardness, and strong dispersion. After being processed into finished gemstones, the color is very similar to that of tourmaline, with higher brightness, stronger fire color and better durability. excellent.

Description

technical field [0001] The invention relates to a synthetic moissanite gem imitating tourmaline and a preparation method thereof, belonging to the technical field of artificial gemstones. Background technique [0002] Tourmaline is a commonly used name in the gem industry in my country, and it belongs to the tourmaline family in mineralogy. Tourmaline is a precious ore second only to diamonds and emeralds. Officials in the Qing Dynasty would wear a tourmaline on their crowns to symbolize their rank and status. Tourmaline is colorful and transparent, and its unique beauty has won the love of the world. Such as CN301308365S pendant (09 tourmaline-01) is the green tourmaline ornament. However, the amount of natural tourmaline is small, and it is expensive to process it into jewelry. [0003] Synthetic moissanite is a high-end imitation material for diamonds. Moissanite has more than 200 different crystal forms, each of which has different physical and optical properties and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B23/00C30B29/36
Inventor 付芬徐现刚胡小波陈秀芳彭燕
Owner SHANDONG UNIV
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