Silicate glass, method for preparing silicate glass-ceramics by using the silicate glass, and method for preparing nano lithium disilicate glass-ceramics by using the silicate glass

Abstract

Provided is a silicate glass, a method for preparing a silicate glass-ceramics by using the silicate glass, and a method for preparing a lithium disilicate glass-ceramics by using the silicate glass, and more particularly, to a method for preparing a glass-ceramics that has a nanosize of 0.2 to 0.5 μ m and contains lithium disilicate and silicate crystalline phases. A nano lithium disilicate glass-ceramics containing a SiO 2 crystalline phase includes: a glass composition including 70 to 85 wt % SiO 2 , 10 to 13 wt % Li 2 O, 3 to 7 wt % P 2 O 5 working as a nuclei formation agent, 0 to 5 wt % Al 2 O 3 for increasing a glass transition temperature and a softening point and enhancing chemical durability of glass, 0 to 2 wt % ZrO 2 , 0.5 to 3 wt % CaO for increasing a thermal expansion coefficient of the glass, 0.5 to 3 wt % Na 2 O, 0.5 to 3 wt % K 2 O, and 1 to 2 wt % colorants, and 0 to 2.0 wt % mixture of MgO, ZnO, F, and La 2 O 3 .

1 . A nano lithium disilicate glass-ceramics containing a SiO 2  crystalline phase, the nano lithium disilicate glass-ceramics comprising:
 a glass composition including 70 to 85 wt % SiO 2 , 10 to 13 wt % Li 2 O, 3 to 7 wt % P 2 O5 working as a nuclei formation agent, 0 to 5 wt % Al 2 O 3  for increasing a glass transition temperature and a softening point and enhancing chemical durability of glass, 0 to 2 wt % ZrO 2 , 0.5 to 3 wt % CaO for increasing a thermal expansion coefficient of the glass, 0.5 to 3 wt % Na 2 O, 0.5 to 3 wt % K 2 O, and 1 to 2 wt % colorants, and 0 to 2.0 wt % mixture of MgO, ZnO, F, and La 2 O 3 .   
     
     
         2 . The nano lithium disilicate glass-ceramics of  claim 1 , wherein the glass composition further includes 1 to 8 wt % K 2 O+Na 2 O, and preferably 0.5 to 3 wt K 2 O and 0.5 to 3 wt % CaO. 
     
     
         3 . The nano lithium disilicate glass-ceramics of  claim 1 , wherein
 the SiO 2  is in a range of 70 to 85 wt %,   the Li 2 O is in a range of 10 to 13 wt %,   the P 2 O 5  is in a range of 3 to 7 wt %,   the Al 2 O 3  is in a range of 0 to 5 wt %,   the ZrO 2  is in a range of 0 to 2 wt %, and   the K 2 O is in a range of 0.5 to 5 wt %.   
     
     
         4 . A method for preparing a nano lithium disilicate glass-ceramics containing a SiO 2  crystalline phase, the method comprising:
 melting the glass composition of  claim 1  and performing crystal growth; and   performing a primary heat treatment at a temperature of 300 to 700° C. for 1 minute to 2 hours.   
     
     
         5 . The method of  claim 4 , further comprising, after the primary heat treatment, performing crystal growth through a secondary heat treatment at a temperature of 750 to 950° C. for 1 minute to 2 hours. 
     
     
         6 . The method of  claim 5 , wherein
 a nucleus containing hyaline as a main component is formed by the primary heat treatment, and   a SiO 2  cluster crystal containing a lithium disilicate crystalline phase as a main component is additionally formed by the secondary heat treatment.   
     
     
         7 . A method for preparing a nano lithium disilicate glass-ceramics containing a SiO 2  crystalline phase, the method comprising:
 melting the glass composition of  claim 1  and performing crystal growth;   performing a primary heat treatment at a temperature of 300 to 700° C. for 1 minute to 2 hours; and   bonding primarily heat-treated glass-ceramics to a zirconia post by using an inorganic bond,   wherein the bonding comprises heat-treating the inorganic bond at a temperature of 700 to 900° C. for 1 minute to 2 hours.   
     
     
         8 . The preparation method of  claim 7 , wherein the composition of the inorganic bond includes 8 to 12 wt % Li 2 O, 50 to 75 wt % SiO 2 , 0 to 3 wt % Al 2 O 3 , 0.5 to 5 wt % CaO, 0.5 to 3 wt % Na 2 O, 0.5 to 3 wt % K 2 O, 0.5 to 7 wt % P 2 O 5  as a nuclei formation agent, 0.5 to 1 wt % colorant, and 0 to 1.0 wt % mixture of MgO, ZnO, F, and La 2 O 3 , and the thermal expansion coefficient is 9.5 to 10.8×10 −6 /° C. 
     
     
         9 . A prosthetic crown for a unitary prosthesis or a bridge prosthesis manufactured by using the nano lithium disilicate glass-ceramics containing the SiO 2  crystalline phase of  claim 7 . 
     
     
         10 . The prosthetic crown of  claim 9 , wherein the prosthetic crown is manufactured through CAD/CAM machining or laser milling. 
     
     
         11 . A method for preparing a nano lithium disilicate glass-ceramics containing a SiO 2  crystalline phase, the method comprising:
 melting the glass composition of  claim 2  and performing crystal growth; and   performing a primary heat treatment at a temperature of 300 to 700° C. for 1 minute to 2 hours.   
     
     
         12 . A method for preparing a nano lithium disilicate glass-ceramics containing a SiO 2  crystalline phase, the method comprising:
 melting the glass composition of  claim 3  and performing crystal growth; and   performing a primary heat treatment at a temperature of 300 to 700° C. for 1 minute to 2 hours.   
     
     
         13 . A method for preparing a nano lithium disilicate glass-ceramics containing a SiO 2  crystalline phase, the method comprising:
 melting the glass composition of  claim 2  and performing crystal growth;   performing a primary heat treatment at a temperature of 300 to 700° C. for 1 minute to 2 hours; and   bonding primarily heat-treated glass-ceramics to a zirconia post by using an inorganic bond,   wherein the bonding comprises heat-treating the inorganic bond at a temperature of 700 to 900° C. for 1 minute to 2 hours.   
     
     
         14 . A method for preparing a nano lithium disilicate glass-ceramics containing a SiO 2  crystalline phase, the method comprising:
 melting the glass composition of  claim 3  and performing crystal growth;   performing a primary heat treatment at a temperature of 300 to 700° C. for 1 minute to 2 hours; and   bonding primarily heat-treated glass-ceramics to a zirconia post by using an inorganic bond,   wherein the bonding comprises heat-treating the inorganic bond at a temperature of 700 to 900° C. for 1 minute to 2 hours.