Metal bonding glass-ceramic compositions having improved hardness
First Claim
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1. A method of bonding a glass-ceramic material to a metal member comprising the steps of:
- A. forming a fluid glass composition consisting essentially of about 60 to 80 weight percent SiO2 12 to 20 weight percent Li2 O, 2 to 14 weight percent MgO, 1.5 to 6 weight percent P2 O5, 1 to 7 weight percent of an alkali oxide selected from the group consisting of K2 O and Na2 O and their mixtures, 0 to 2 weight percent of a transition metal oxide selected from the group consisting of Co3 O4, MnO2, Fe2 O3, V2 O5 and WO3 and their mixtures, 0 to 5 weight percent PbO, 0 to 2 weight percent Al2 O3 and 0 to 1 weight percent As2 O3 ;
B. applying the glass composition directly to a metal member;
C. cooling the glass to a temperature of below about 600°
C;
D. heating the glass and metal member up to a temperature of about 900°
C at a rate of about 10°
-80°
C per hour, to form a glass-ceramic from the glass composition which intimately bonds directly to the metal member, said glass-ceramic being a substantially homogeneous microcrystalline mass of ceramic having a Knoop handness value of over about 660 in a glass matrix;
E. maintaining the temperature of the glass-ceramic bonded metal member for about 1/2-10 hours;
F. cooling the glass-ceramic bonded metal member to room temperature.
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Abstract
A metal member is coated with or embedded in a high-magnesia glass-ceramic material having the approximate composition of about 60 to 80 weight percent SiO2, 12 to 20 weight percent Li2 O, 2 to 14 weight percent MgO, 1.5 to 6 weight percent P2 O5, 1 to 7 weight percent of an alkali oxide selected from the group consisting of K2 O and Na2 O and their mixtures, 0 to 2 weight percent of a transition metal oxide selected from the group consisting of Co3 O4, MnO2, Fe2 O3, V2 O5 and WO3 and their mixtures, 0 to 5 weight percent PbO, 0 to 2 weight percent Al2 O3 and 0 to 1 weight percent As2 O3.
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Citations
7 Claims
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1. A method of bonding a glass-ceramic material to a metal member comprising the steps of:
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A. forming a fluid glass composition consisting essentially of about 60 to 80 weight percent SiO2 12 to 20 weight percent Li2 O, 2 to 14 weight percent MgO, 1.5 to 6 weight percent P2 O5, 1 to 7 weight percent of an alkali oxide selected from the group consisting of K2 O and Na2 O and their mixtures, 0 to 2 weight percent of a transition metal oxide selected from the group consisting of Co3 O4, MnO2, Fe2 O3, V2 O5 and WO3 and their mixtures, 0 to 5 weight percent PbO, 0 to 2 weight percent Al2 O3 and 0 to 1 weight percent As2 O3 ; B. applying the glass composition directly to a metal member; C. cooling the glass to a temperature of below about 600°
C;D. heating the glass and metal member up to a temperature of about 900°
C at a rate of about 10°
-80°
C per hour, to form a glass-ceramic from the glass composition which intimately bonds directly to the metal member, said glass-ceramic being a substantially homogeneous microcrystalline mass of ceramic having a Knoop handness value of over about 660 in a glass matrix;E. maintaining the temperature of the glass-ceramic bonded metal member for about 1/2-10 hours; F. cooling the glass-ceramic bonded metal member to room temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification