Patent ID: 11858846
Assignee: CHINA BUILDING MATERIALS ACADEMY CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  G  Y | IPC C  G

Claim 2:
3. A fabrication method for the glass with high refractive index for fiber optic imaging elements with medium-expansion with the composition according to claim 1, comprising the following steps:
(1) putting quartz sand, aluminum hydroxide, boric acid or boric anhydride, calcium carbonate, barium carbonate or barium nitrate, lanthanum oxide, niobium oxide, tantalum oxide, yttrium oxide, zinc oxide, titanium dioxide, zirconium oxide and stannic oxide into a platinum crucible according to the requirement of dosing;
(2) melting at a first preset temperature, stirring in the melting process, then cooling to a second preset temperature and fining to obtain a fining glass melt;
(3) allowing the fining glass melt to flow down through a leaking port, and casting the fining glass melt in a mold to form a glass rod;
(4) annealing the molded glass rod in an annealing furnace, and then cooling to room temperature along with the furnace.