Patent ID: 7147736

Claim:
A method for reducing x,y shrinkage during firing of a green assembly comprising at least one layer of glass-containing non-sacrificial constraining tape and at least one layer of glass-containing primary tape, wherein the constraining tape and the primary tape are laminated to form an assembly, the method comprising the step of firing the green assembly, wherein the tape components of the assembly upon thermal processing exhibit an interactive suppression of x,y shrinkage to substantially zero, wherein the glass in the primary tape exhibits a dimensional change measured in TMA (at 5-gram loading force and 10° C./min heating rate) of about 700° C. or higher, wherein the glass in the constraining tape exhibits a dimensional change measured in TMA of at least 75° C. lower than the primary tape, wherein the glass of the constraining tape initiates sintering before the glass of the primary tape and the constraining tape transforms into a rigid form below 700° C. and, wherein the glass of the constraining tape develops in excess of 50 volume % crystalline phases, and wherein the glass in the primary tape and the glass in the constraining tape are each crystallizable-glass.