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flame-fusion process

[fleym-fyoo-zhuh n] /ˈfleɪmˈfyu ʒən/
noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for flame fusion pro-cess'

flame-fusion process

method for producing synthetic rubies and sapphires. Originally developed (1902) by a French chemist, Auguste Verneuil, the process produces a boule (a mass of alumina with the same physical and chemical characteristics as corundum) from finely ground alumina (Al2O3) by means of an inverted oxyhydrogen torch that opens into a ceramic muffle. With slight modifications, this method is used to produce spinel, rutile, and strontium titanate.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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