公开(公告)号：US20240246850A1

公开(公告)日：2024-07-25

申请号：US18411231

申请日：2024-01-12

Applicant: CORNING INCORPORATED

Inventor： Michael John Campion ,  Sergey Nikolaevich Shubin ,  Pushkar Tandon

IPC: C03B19/14

CPC classification number: C03B19/1453 ,  C03B2201/075

Abstract: A process of forming a titania-silica glass body, the process including exposing a titania-doped silica soot body to a first thermal treatment by heating the body to a first temperature T1 between about 800° C. and about 1100° C. for a first time duration t1 calculated using the equation:






t
⁢
1

>


L
c
2


4
⁢
α



,




wherein Lc is the characteristic length (cm) of the body and α is the thermal diffusivity (cm2/sec) of the body. The process further including exposing the body to a second thermal treatment by heating the body to a second temperature T2 between about 1050° C. and about 1250° C. wherein, after the second thermal treatment, a peak-to-valley difference of hydroxyl concentration amongst a plurality of segments of the body is about 70 ppm or less.

公开(公告)号：US20240360025A1

公开(公告)日：2024-10-31

申请号：US18638912

申请日：2024-04-18

Applicant: CORNING INCORPORATED

Inventor： Steven Treavis Arndt ,  Ilia Andreyevich Nikulin ,  Nikolay Anatolyevich Panin ,  Sergey Nikolaevich Shubin

IPC: C03B37/018 ,  C03B37/027

CPC classification number: C03B37/01853 ,  C03B37/027

Abstract: A method of manufacturing including: with a porous glass body having a surface and a density at the surface having been loaded into a furnace with heating elements disposed along a length of the porous glass body, a first heat treatment step comprising activating the heating elements until the porous glass body at an inner surface of the porous glass body facing a centerline of the porous glass body has a first temperature that is greater than or equal to 1250° C. for a first period of time greater than or equal to 1 hour; wherein, as a result of the first heat treatment step, the density of the porous glass body at the surface increases but is less than 85% of a closed pore density of a sintered glass preform made from the porous glass body.