Process for bonding devitrified surfaces

Claim 1

A PROCESS OF FORMING AN ARTICLE HAVING AT LEAST TWO MEMBERS, ONE OF SAID MEMBERS BEING A DEVITRIFIED MEMBER CONSISTING ESSENTIALLY OF A MULTIPLICITY OF INTERLOCKED INORGANIC CRYSTLS DISPERSED IN A GLASSY MATRIX AND FORMED BY CRYSTALLIZATION IN SITU FROM A GLASS CONSISTING ESSENTIALLY OF INORGANIC CONSTITUENTS AND A NUCLEATING AGENT THEREFOR, SAID GLASSY MATRIX CONSISTING ESSENTIALLY OF THE UNCRYSTALLIZED PORTION OF THE GLASS, THE OTHER OF SAID MEMBERS BEING A DEVITRIFIABLE VITREOUS MEMBER CONSISTING ESSENTIALLY OF INORGANIC CONSTITUENTS AND CONTAINING A NUCLEATING AGENT THEREFOR, COMPRISING THE STEPS OF PLACING A SURFACE OF SAID DEVITRIFIED MEMBER INTO CONTACT WITH A SURFACE OF SAID DEVITRIFIABLE VITREOUS MEMBER AND SUBJECTING THE ADJOINING CONTACTING SURFACES TO A TEMPERATURE SUFFICIENT TO SOFTEN THE SURFACE OF SAID VITREOUS MEMBER AND DIFFUSE IT INTO THE SURFACE OF SAID DEVITRIFIED MEMBER AND THEN FURTHER SUBJECTING SAID ADJOINING CONTACTING SURFACES FOR A PERIOD OF TIME TO TEMPERATURES SUFFICIENT TO THERMALLY DEVITRIFY SAID VITEOUS SURFACE AND TO BOND SAID SURFACES WITH A DEVITRIFIED SEAL.