Browse Prior Art Database

Improved Flow for MLC Sintering Kiln

IP.com Disclosure Number: IPCOM000050205D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Hendriks, F: AUTHOR

Abstract

In the present technique for manufacturing multilayer ceramic (MLC) packages, sintering of pressed MLC blanks takes place in a cylindrical ("BTU") furnace 10, as shown in Fig.1, which is slowly perfused with a hydrogen water vapor mixture which enters through ports 12 and 14 and port 16. The intent is to ventilate the stack 18 of MLC modules, but it is believed that this ventilation is presently inadequate because decreasing the inter-plane spacing h leads to a lower yield. This is particularly so at the high furnace temperature wherein the gas behaves in a very viscous manner; decreasing h aggravates the problem of gas transport through the stack.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 94% of the total text.

Page 1 of 2

Improved Flow for MLC Sintering Kiln

In the present technique for manufacturing multilayer ceramic (MLC) packages, sintering of pressed MLC blanks takes place in a cylindrical ("BTU") furnace 10, as shown in Fig.1, which is slowly perfused with a hydrogen water vapor mixture which enters through ports 12 and 14 and port 16. The intent is to ventilate the stack 18 of MLC modules, but it is believed that this ventilation is presently inadequate because decreasing the inter-plane spacing h leads to a lower yield. This is particularly so at the high furnace temperature wherein the gas behaves in a very viscous manner; decreasing h aggravates the problem of gas transport through the stack.

In the technique described in this publication, the furnace is modified, as shown in Fig. 2, by fitting it with a baffle plate 20 which channels the gas flow through ports 12 and 14 into the stack 18 in a direction shown by the arrows.

The discharge is through port 16. In Fig.1, most of the gas flow will bypass the stack without providing forced convection for the stack. In Fig.2, bypass is prevented and inter-plane gas must take part in the overall forced furnace ventilation. A further enhancement of convection will take place if the cylindrical segments 22 and 24 are installed. This blocks flow around the sides of the stack. It is understood that all internal modifications 20,22 and 24, must be constructed of a material capable of withstanding the maximum furnace temperatures and ...