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2021-4-15 · Single crystalline diamond (SCD) grits are usually made by a high-pressure and high-temperature (HPHT) method and exhibit cuboctahedral shapes and smooth surfaces. In this paper, we synthesized new kinds of SCD grits and nanocrystalline diamond (NCD) grits by a chemical vapor deposition (CVD) method and explored their grinding performance by single grit grinding of SiC .
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2016-7-25 · The tabular crystals often develop a rough edge of black graphite that needs to be cut away. They also display a brown colour that can be removed by heat treatment prior to faceting. Most CVD-grown colourless material on the market was probably once brown crystals that have been decolourized by HPHT annealing.
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2016-7-25 · The tabular crystals often develop a rough edge of black graphite that needs to be cut away. They also display a brown color that can be removed by heat treatment prior to faceting. Most CVD-grown colorless material on the market were probably once brown crystals that have been decolorized by HPHT annealing.
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This article reviews the main mistakes to avoid when buying a lab-created diamond: CVD – Avoid brown color hue. Avoid diamonds with strain lines that cause them to look fuzzy. HPHT – Avoid blue color hue ("blue nuance" or "faint blue"). There's a lot of variation in .
This article reviews the main mistakes to avoid when buying a lab-created diamond: CVD – Avoid brown color hue. Avoid diamonds with strain lines that cause them to look fuzzy. HPHT – Avoid blue color hue ("blue nuance" or "faint blue"). There's a lot of variation in .
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2021-6-29 · Colorless CVD is reliably Type IIa, so it's identified that way on reports. Colorless HPHT are widely Type IIa but, depending on process, can have slight traces of boron. To account for this, confirmation of Type II, without stipulating a or b, is the default for colorless HPHT on reports.
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