The history of chrome corundum
In 1877, fremy, a French chemist, used pure alumina powder, potassium carbonate, barium fluoride and a small amount of potassium dichromate as raw materials. After being melted at high temperature for 8 days in the crucible, he obtained small ruby crystals, which was the beginning of artificial ruby.
In 1900, scientists melted aluminum oxide with a small amount of chromium oxide, Cr2O3, by weight to zero.The 7% method of adding rubies produced 2g~~4g rubies.Today, rubies and sapphires can be made up to 10 gigabytes.
In 1885 in Geneva, Switzerland, there were some fine artificial rubies, which were said to be fragments of natural rubies, made by melting at high temperatures, such as potassium dichromate, which enhanced red color.
Werner leaf in 1891 flame melting method, with the manufacture of artificial gems, after the success with pure alumina experiment. In the high temperature muffle furnace using inversion, the experiments of hydrogen and oxygen torch at the end of the pure aluminum oxide containing a small amount of chrome oxide thin melt slowly fell into the flame, drops of condensing crystallization on the pedestal. After 10 years of efforts.
In 1904, Verna leaf was officially manufactured as an artificial ruby. Later, the flame fusion method was gradually improved, and the ruby and natural products were almost identical.Now as long as several hours can produce more than 100 carats ruby rough stone, appearance is inverted pear-shaped or carrot shape synthetic corundum crystal, pure texture, color transparency even more than natural, economic benefit is huge. Modern leaf Werner method can not only produce from pale pink to deep red ruby, also can produce various colors of sapphire, can even produce with starlight ruby and sapphire, really wonderful artical excelling nature.