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Fabricating Seedless Copper Containing Solder Glass Rods

IP.com Disclosure Number: IPCOM000086874D
Original Publication Date: 1976-Nov-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Powell, JL: AUTHOR [+2]

Abstract

Seed-free glass seal rods having, for example, the following composition are formed in a two-step process. GLASS COMPOSITION PbO 64.6 wt. % B(2)O(3) 13.9 wt. % SiO(2) 2.8 wt. % Al(2)O(3) 1.0 wt. % ZnO 11.9 wt. % Bi(2)O(3) 1.5 wt. % CuO 4.3 wt. % STEP I a) Weigh glass oxide ingredients to the appropriate weight percents and then mix them together in batch form for about one hour. b) Charge part of the batch to a platinum crucible. c) Raise the temperature to 850 degrees C to form a liquid. d) Add the remaining batch little by little until the entire batch is in solution. e) Raise the melt temperature slowly to 875 +/- 10 degrees C.

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Fabricating Seedless Copper Containing Solder Glass Rods

Seed-free glass seal rods having, for example, the following composition are formed in a two-step process. GLASS COMPOSITION

PbO 64.6 wt. %

B(2)O(3) 13.9 wt. %

SiO(2) 2.8 wt. %

Al(2)O(3) 1.0 wt. %

ZnO 11.9 wt. %

Bi(2)O(3) 1.5 wt. %

CuO 4.3 wt. %

STEP I
a) Weigh glass oxide ingredients to the appropriate weight

percents and then mix them together in batch form for about

one hour.
b) Charge part of the batch to a platinum crucible.
c) Raise the temperature to 850 degrees C to form a liquid.
d) Add the remaining batch little by little until the entire

batch is in solution.
e) Raise the melt temperature slowly to 875 +/- 10 degrees C.
f) Fine the melt at 875 +/- 10 degrees C for, at least, 3 1/2

hours and no more than 4 hours.
g) Pour the melt into deionized water from 875 +/- 10 degrees C.
h) Dry the cullet in an air-vented oven at ~ 180 degrees C.

STEP II
a) Charge the dry cullet to a platinum crucible at 875 +/- 10

degrees C.
b) When the cullet is in solution, fine the melt at 875 +/- 10

degrees C for one hour and no more than 1 1/4 hours.
c) Pour the melt into molds from melt temperature (875 +/- 10

degrees C), or draw billets directly from the melt and

allow the billets to cool slowly from annealing

temperature (~ 350 degrees) to room temperature.
d) Redraw glass rods of desired dimensions and shapes from

processed billets.

The second fining period (indicated in Step II, latter part of item b) is necessary...