Chemically strengthened bioactive glass-ceramics

Patent metadata

Field	Value
Publication number	US-2019160201-A1
Application number	US-201816202786-A
Country	US
Kind code	A1
Filing date	Nov 28, 2018
Priority date	Nov 28, 2017
Publication date	May 30, 2019
Grant date	—

Abstract

A chemically strengthened bioactive glass-ceramic composition as defined herein. Also disclosed are methods of making and using the disclosed compositions.

First claim

What is claimed is:

1 . A glass-ceramic composition, comprising:
a first crystalline phase and a second crystalline phase, in combination, comprise a source of: 50 to 75 wt % SiO 2 , 1 to 5 wt % Al 2 O 3 , 0.1 to 10% B 2 O 3 , 5 to 20 wt % Li 2 O, 0.5 to 5 wt % Na 2 O, 0.1 to 4% K 2 O, 0.5 to 6 wt % P 2 O 5 0.5 to 8% ZrO 2 , and 0.1 to 1.0 wt % F − , based on a 100 wt % total of the composition.

2 . The glass-ceramic composition of claim 1 further comprising having composition particles having ion-exchanged surfaces having a reduced lithium ion (Li + ) concentration and having at least one of an elevated sodium ion (Na + ) surface concentration, an elevated potassium ion (K + ) surface concentration, or elevated concentrations of lithium ion (Li + ) and sodium ion (Na + ) on the surface.

3 . The glass-ceramic composition of claim 1 wherein the source is:
50 to 70 wt % SiO 2 ,
1 to 4 wt % Al 2 O 3 ,
0.1 to 4% B 2 O 3 ,
6 to 18 wt % Li 2 O,
1 to 4 wt % Na 2 O,
0.1 to 3% K 2 O,
1 to 5 wt % P 2 O 5
1 to 6% ZrO 2 , and
0.1 to 1.0 wt % F − , based on a 100 wt % total of the composition.

4 . The glass-ceramic composition of claim 3 further comprising having composition particles having ion-exchanged surfaces having a reduced lithium ion (Li + ) concentration and having at least one of an elevated sodium (Na + ) concentration, an elevated potassium (K + ) concentration, or an elevated concentrations of lithium ion (Li + ) and sodium ion (Na + ).

5 . A glass-ceramic composition, comprising:
a first crystalline phase and a second crystalline phase, in combination, comprising: 55 to 65 wt % SiO 2 , 2 to 4 wt % Al 2 O 3 , 8 to 16 wt % Li 2 O, 1 to 4 wt % Na 2 O, 0.1 to 2% K 2 O, 2 to 5 wt % P 2 O 5 1 to 5% ZrO 2 , and 0.1 to 1.0 wt % F—, based on a 100 wt % total of the composition.

6 . The glass-ceramic composition of claim 5 further comprising having composition particles having ion-exchanged surfaces having a reduced lithium ion (Li + ) concentration and having at least one of an elevated sodium (Na + ) concentration, an elevated potassium (K + ) concentration, or an elevated concentrations of lithium ion (Li + ) and sodium ion (Na + ).

7 . The glass-ceramic composition of claim 5 wherein the composition is free of B 2 O 3 .

8 . The glass-ceramic composition of claim 1 wherein the first crystalline phase comprises of from 50 to 99 wt % and the second crystalline phase comprises of from 1 to 50 wt % based on a 100 wt % total of the composition.

9 . The glass-ceramic composition of claim 1 wherein the first crystalline phase is lithium disilicate, and the second crystalline phase is at least one of wollastonite, fluroapatite, cristobalite, β-quartz, lithiophosphate, or mixtures thereof.

10 . A glass-ceramic article comprising:
50 to 75 wt % SiO 2 , 1 to 5 wt % Al 2 O 3 , 0.1 to 10% B 2 O 3 , 5 to 20 wt % Li 2 O, 0.5 to 5 wt % Na 2 O, 0.1 to 4% K 2 O, 0.5 to 6 wt % P 2 O 5 0.5 to 8% ZrO 2 , and 0.1 to 1.0 wt % F − , based on a 100 wt % total of the composition.

11 . The glass-ceramic article of claim 10 wherein the flexural strength of the article is from 300 to 2,000 MPa.

12 . A method of making a bioactive glass-ceramic article comprising:
forming a melt mixture of a source of: 50 to 75 wt % SiO 2 , 1 to 5 wt % Al 2 O 3 , 0.1 to 10% B 203 , 5 to 20 wt % Li 2 O, 0.5 to 5 wt % Na 2 O, 0.1 to 4% K 2 O, 0.5 to 6 wt % P 2 O 5 0.5 to 8% ZrO 2 , and 0.1 to 1.0 wt % F − , based on a 100 wt % total of the composition to form a glass-ceramic article; forming an article from the melt; and accomplishing at least one chemical strengthening of the resulting glass-ceramic article.

13 . The method of making a bioactive glass-ceramic article of claim 12 wherein the article comprises a pattie, a dimensioned portion cut from a pattie, a plurality of particles, a drawn sheet, a drawn fiber, or combinations thereof.

14 . The method of making a bioactive glass-ceramic article of claim 12 further comprising annealing the article prior to accomplishing at least one chemical strengthening.

15 . The method of claim 12 wherein the at least one chemical strengthening of the resulting glass-ceramic article is accomplished for a suitable time by ion exchanging in a NaNO 3 bath to exchange out lithium ions, exchanging in a KNO 3 bath to exchange out lithium ions and sodium ions from the surface of the article, or exchanging in a NaNO 3 and KNO 3 bath to exchange out lithium ions from the surface of the article.

16 . The method of claim 12 wherein the bioactive glass-ceramic article has a bioactivity after ion-exchanging.

Assignees

• Corning Inc

Inventors

• Deng Huayun
• Fu Qiang
• Mauro John Christopher

Classifications

• C03C21/002 Primary

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C10/16

  Halogen containing crystalline phase · CPC title

• C03C10/0027

  containing SiO2, Al2O3, Li2O as main constituents · CPC title

• A61L27/047

  Other specific metals or alloys not covered by A61L27/042 - A61L27/045 or A61L27/06 · CPC title

• C03C3/118

  containing aluminium · CPC title