Effective method for preparing multi-size annular mullite

Abstract

The invention discloses an effective method for preparing multi-size annular mullite, which comprises the following steps: using a silicon carbide single crystal substrate multi-size annular graphitecylinder composite substrate; adhering the back surface of the composite substrate to the inner layer of a graphite crucible cover, adhering an annular graphite cylinder to the growth surface of the substrate, putting a high-purity silicon carbide raw material into the bottom in a graphite crucible, and performing crystal growth by adopting a physical vapor transport method to obtain the annular mullite, so the annular mullite can be more conveniently processed into annular ornaments with different pore diameters.

Description

technical field [0001] The invention relates to a method for preparing moissanite, in particular to a method for preparing multi-size annular moissanite. Background technique [0002] Gemstones are a common worn or decorative accessory. Gemstone jewelry is divided into natural gemstones and artificial gemstones. Natural gemstones are difficult to be widely used in the jewelry market due to their small reserves and high impurity content. Very few relatively pure natural gemstones can be used for jewelry processing, but their prices are extremely expensive. [0003] Moissanite, also known as moissanite or silicon carbide gemstone, is second only to diamond in hardness, so it is difficult to wear and corrode, and Moissanite of different colors can be obtained through different doping in the preparation process. Moissanite has a high refractive index and excellent thermal stability, making it a good substitute for natural gemstones. Natural moissanite was discovered by humans ...

AI Technical Summary

Problems solved by technology

[0006] Because moissanite is very hard, the closest to diamond, and brittle, it is difficult to cut, grind, polish, etc., and the processing cost accounts for a large proportion of the overall price.

Especially difficult when processing bulk moissanite into small, non-linear gemstones

Not only expensive processing equipment is required, but also a long processing time is required, so the production efficiency of moissanite gemstones is low, the yield is low, and the product form is single

This brings great difficulties to the marketization of moissanite gemstones

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