US 12,434,991 B2
Method for producing glass article and glass article
Mutsumu Fukada, Shiga (JP); Motokazu Ogata, Shiga (JP); and Mina Mabuchi, Shiga (JP)
Assigned to NIPPON ELECTRIC GLASS CO., LTD., Shiga (JP)
Appl. No. 17/775,383
Filed by Nippon Electric Glass Co., Ltd., Shiga (JP)
PCT Filed Dec. 2, 2020, PCT No. PCT/JP2020/044833
§ 371(c)(1), (2) Date May 9, 2022,
PCT Pub. No. WO2021/124892, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 2019-229404 (JP), filed on Dec. 19, 2019.
Prior Publication US 2022/0388887 A1, Dec. 8, 2022
Int. Cl. C03B 17/06 (2006.01); C03C 3/097 (2006.01)
CPC C03B 17/064 (2013.01) [C03C 3/097 (2013.01)] 7 Claims
OG exemplary drawing
 
6. A method of manufacturing a glass article, the method comprising:
a forming step of causing a first molten glass comprising P2O5 to flow down along a surface of a forming trough comprising an yttrium-containing oxide by a down-draw method to form a glass ribbon; and
a formation step, performed prior to the forming step, of forming a diffusion suppression layer on the surface of the forming trough to suppress diffusion of the yttrium-containing oxide,
wherein the diffusion suppression layer is an alumina layer, and
wherein the formation step comprises:
a first step of causing a second molten glass comprising MgO to flow down along the surface of the forming trough to form a Mg-rich layer comprising spinel as a main component on the surface of the forming trough; and
a second step of causing a third molten glass substantially free of MgO to flow down along the surface of the forming trough on which the Mg-rich layer has been formed to form the alumina layer.