The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 2020
Filed:
Aug. 28, 2017
Schott Glass Technologies (Suzhou) Co. Ltd., Jiang Su, CN;
Huiyan Fan, Suzhou, CN;
Junming Xue, Suzhou, CN;
Jose Zimmer, Losheim am See, DE;
Chong Wang, Suzhou, CN;
Wenliang Ping, Suzhou, CN;
SCHOTT Glass Technologies (Suzhou) Co. Ltd., Jiang Su, CN;
Abstract
The present invention is directed to a kind of machinable glass ceramic which can be chemically toughened. The machinable and chemically toughenable glass ceramic, which comprises, as represented by weight percentage based on the following compositions, 25-75 wt % of SiO, 6-30 wt % of AlO, 0.1-30 wt % of NaO, 0-15 wt % of KO, 0-30 wt % of BO, 4-35 wt % of MgO, 0-4 wt % of CaO, 1-20 wt % of F, 0-10 wt % of ZrO, 0.1-10 wt % of PO, 0-1 wt % of CeOand 0-1 wt % of SnO, wherein PO+NaO>3 wt %, and AlO+NaO+PO>17 wt %. Mica crystalline phase can be formed in the glass ceramic and the glass ceramic can be chemically toughened by one step, two steps or multiple steps with depth of K-ion layer of at least 15 μm and surface compress stress of at least 300 MPa. The profile on depth of the ion exchange layer follows the complementary error function. Hardness can be improved by at least 20% after chemical toughening. The dimension deviation ratio is less than 0.06% by ion-exchanging.