Metal bonding glass-ceramic compositions having improved hardnes

Details Metal bonding glass-ceramic compositions having improved hardnes Metal bonding glass-ceramic compositions having improved hardnes

1975-08-07

1976-08-31

Whitby, Edward G.

Glass manufacturing

Processes

Devitrifying glass or vitrifying crystalline glass

65 43, 65 49, 65 59R, 106 397, 106 48, 156 89, 156242, 174137R, C03B 3200

Patent

active

039778576

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 SiO.sub.2, 12 to 20 weight percent Li.sub.2 O, 2 to 14 weight percent MgO, 1.5 to 6 weight percent P.sub.2 O.sub.5, 1 to 7 weight percent of an alkali oxide selected from the group consisting of K.sub.2 O and Na.sub.2 O and their mixtures, 0 to 2 weight percent of a transition metal oxide selected from the group consisting of Co.sub.3 O.sub.4, MnO.sub.2, Fe.sub.2 O.sub.3, V.sub.2 O.sub.5 and WO.sub.3 and their mixtures, 0 to 5 weight percent PbO, 0 to 2 weight percent Al.sub.2 O.sub.3 and 0 to 1 weight percent As.sub.2 O.sub.3.

REFERENCES:
patent: 2089791 (1937-08-01), Hammer
patent: 3730698 (1973-05-01), Richardson et al.

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