Unlock instant, AI-driven research and patent intelligence for your innovation.

Chemically strengthenable machinable glass-ceramics

A technology of glass ceramics and mechanical processing, which is applied in the field of machinable glass ceramics and can solve problems such as not having

Pending Publication Date: 2020-12-01
CORNING INC
View PDF26 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Previous machinable glass-ceramics, while valuable and useful for a variety of applications, did not have the ability to be chemically strengthened (e.g., by ion exchange) to improve their mechanical strength

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Chemically strengthenable machinable glass-ceramics
  • Chemically strengthenable machinable glass-ceramics
  • Chemically strengthenable machinable glass-ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Example 1: Preparation of Machinable Glass Ceramics

[0105] Tables 1 and 2 provide examples of representative compositions according to the techniques herein. Exemplary glass-ceramics described herein are trisilicates or tetrasilicates or mica solid solutions between trisilicon and tetrasilicon, exhibiting the Components form the basis of crystalline glass ceramics.

[0106] key term abbreviation

[0107]

[0108] Table 1:

[0109]

[0110]

[0111] *No secondary phases recorded.

[0112] **In glass, there is F distributed among the various cations, ie, some oxygen in the oxide is replaced by fluorine, so the oxygen equivalent of fluorine (16 / 38 x amount of F) is subtracted from the sample to get 100%.

[0113] Table 2:

[0114]

[0115]

[0116] *No secondary phases recorded.

[0117] **In glass, there is F distributed among the various cations, ie, some oxygen in the oxide is replaced by fluorine, so the oxygen equivalent of fluorine (16 / 38 x amo...

Embodiment 2

[0121] Example 2: Ion Exchange of Machinable Glass Ceramics

[0122] Some machinable glass-ceramics prepared according to the process of Example 1 were ion-exchanged in designated salt baths for the times and temperatures listed in Table 4.

[0123] Table 4: Ion Exchange Parameters

[0124]

Embodiment 3

[0125] Example 3: Characteristics

[0126] In the following examples, various properties of the materials listed in Table 1 will be described. Properties may include: CIELAB color space coordinates, translucency, opacity, viscosity, annealing point, strain point, dielectric parameters, identification of crystal phase and / or crystal size, element distribution, compressive stress distribution, Vickers hardness, Mohs Hardness, coefficient of thermal expansion (CTE), fracture toughness (G, K 1C ^2 / E), brittleness index (B, H / k1c). Exemplary methods for properties are provided below.

[0127] Methods known to those skilled in the art can be used, for example, ASTM C598 (and its successors, which are incorporated herein by reference in their entirety), "Standard Test Method for Annealing Point and Strain Point of Glass by Beam Bending Annealing Point and Strain Point of Glass by Beam Bending), ASTM International, Conshohocken, PA, US, to measure the annealing point and strain poi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
shear modulusaaaaaaaaaa
Login to View More

Abstract

A glass-ceramic comprising, in weight percent on an oxide basis, of 50 to 70% SiO2, 0 to 20% AI2O3, 12 to 23% MgO, 0 to 4% Li2O, 0 to 10% Na2O, 0 to 10% K2O, 0 to 5% ZrO2, and 2 to 12% F, wherein thepredominant crystalline phase of said glass-ceramic is a trisilicic mica, a tetrasilicic mica, or a mica solid solution between trisilicic and tetrasilicic, and wherein the total of Na2O + Li2O is atleast 2 wt.%; wherein the glass-ceramic can be ion-exchanged.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. §119 to U.S. Provisional Application Serial No. 62 / 828460, filed April 2, 2019, which application is based upon and is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to machinable glass-ceramics that can be chemically strengthened. In particular, the present disclosure relates to glass-ceramics and precursor glasses crystallizable into glass-ceramics that can be strengthened by ion exchange processes; and methods of making machinable glass-ceramics and articles comprising machinable glass-ceramics . Background technique [0004] The following discussion is provided to assist the reader in understanding the present disclosure and is not intended to admit that it describes or constitutes prior art. [0005] Mica is classified as a phyllosilicate; its basic structural feature is a composite sheet in which a layer ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/078C03C3/085C03C3/091C03C3/112C03C10/00C03C10/16C03C21/00C03C10/08C03C10/10
CPCC03C3/078C03C3/085C03C3/112C03C3/091C03C10/0018C03C10/0045C03C10/16C03C21/002C03B25/02C03B32/02C03C4/18C03C10/0009C03C10/0054C03C2204/00
Inventor G·H·比尔J·P·芬克尔德C·M·史密斯
Owner CORNING INC