An amorphous silicon dioxide form body is partly or wholly glazed and infiltrated during melt phase with Barium, Aluminum or Boron compounds

摘要

An amorphous silicon dioxide form body is partly or wholly glazed, in which areas it is infiltrated with a substance that, on heating to a temperature between 1000[deg] to 1800[deg]C, crystallizes the glazed zones. The infiltrated substance is from the group of Barium, Aluminum or Boron compounds, or a mixture of these.