Verneuil process

The Verneuil process is a crucible-free flame fusion method for the production of synthetic gemstones, which was published in 1902 by the French chemist Auguste Verneuil. Today the Verneuil process for producing sapphire from synthetic sapphire is used, initially the procedure for the synthesis ruby has been developed.

Implementation

A metering device containing a high-purity powdery material, which is melted within the burner tube of a kiln with hydrogen and oxygen and placed layer by layer on a seed crystal to solidify. While the crystal in the form of a so-called " breeding pear" per hour increases by about 5-20 mm, they are determined using a lowering device slowly moved down to keep it at the ideal focal zone of the furnace. In industrial plants, a large number of such devices are arranged (even 1000 and more ) is generally. The cultured with the Verneuil method crystals are essentially pear-shaped and have a size of about 20 to 50 mm.