Patent ID: 7661277

Claim:
A method of producing a quartz glass containing 0.1 to 20 wt % in total of two or more types of metallic elements, said metallic elements comprising at least one type of metallic element selected from Group 3B of the periodic table as a first metallic element and at least one type of metallic element selected from the group consisting of Mg, Ca, Sr, Ba, Sc, Ti, and Hf as a second metallic element, provided that a maximum concentration of each of the second metallic elements is 2.0 wt % or less, which is a method of producing quartz glass having excellent resistance against plasma corrosion by Verneuil method using a furnace equipped with a rotating table and a burner which supplies powder raw material and gases, the method comprising the steps of: supplying the powder raw material prepared by mixing quartz powder with powders of said first and second metallic elements or a powder of a compound thereof to the burner, and dropping a hot-molten product to said table to produce a quartz glass ingot, a surface temperature of said quartz glass ingot is heated to 1800° C. or higher.