Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1992-02-28
1994-11-29
Jones, W. Gary
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
1562737, 1563797, 1563803, 156 89, 156359, 1562744, 219765, 219780, B32B 3100
Patent
active
053686730
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
The present concerns a joining method for joining electrically ceramic bodies and a joining apparatus and joining agent for use in the joining method.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement of a joining method for joining two ceramic bodies in a large size or in a complicated shape by heating electrically a butted portion to be jointed with, as main heat source, Joule heat caused by supplying electric current to the portion to be jointed, and more particularly to an improved joining method applicable for a method described below (a joining method to supply electric current to a ceramic body or a joining agent having an electric conductivity at a high temperature to complete the joining process).
2. Discussion of the Prior Art
A conventional joining method for joining electrically ceramic bodies is divided into the following four groups:
(A) A method which joins ceramic bodies by supplying electric current to the ceramic bodies or a joining agent having an electric conductivity at a high temperature. In this case, a joining agent is inserted at butted planes to be jointed between the ceramic bodies to form a butted portion and the portion is preheated with an auxiliary heating method by using a gas burner or a preheating means. After the ceramic bodies or the joining agent is in an electric conduction, the electric voltage is applied across at least two electrodes attached to the butted portion to be jointed to flow electric current through the electric conductive ceramic body or the joining agent at a high temperature. As a result, the plane to be jointed is heated with the Joule heat caused by the electric current flowing through the conductive ceramic body or the joining agent, and a reaction between the joining agent and the ceramic body is carried out to complete the joining.
(B) A method for joining ceramic bodies at least one of which has an electric conductivity at room temperature by permitting an electric current to flow through the electric conductive ceramic body in parallel to portion to be jointed.
A joining agent is inserted between the ceramic bodies at least one of which has an electric conductivity at room temperature. The ceramic body having an electric conductivity has two electrodes or an electrode in a belt form linked thereto at the vicinity of the butted portion and is supplied the electric current to the conductive ceramic body for heating the vicinity of the butted portion by Joule heat. As a result, the joining agent reacts with the ceramic bodies to join the butted planes of the ceramic bodies.
(C) A joining method in which an inserting member for heating having an electric conduction at room temperature is inserted between planes to be jointed of two ceramic bodies and is heated by an electric current flowing in parallel to the butted planes to be jointed.
(a) The inserting member for heating is composed of an electrically conductive ceramic body having the joining agents attached to the both surfaces thereof and is inserted into the butted planes to be jointed between ceramic bodies of an insulating property or of a high electrical resistance. The both terminal surfaces of the inserting member for heating are linked with at least two electrodes or an electrode in a belt form and are heated by an electric current flowing in parallel to the butted planes to be jointed. The Joule heat generated by the electric current heats the butted portion and executes the reaction between the joining agent and the ceramic bodies to complete the joining.
(b) The inserting member for heating is composed of an electric conductive ceramic base laminated by an insulating ceramic layer and is inserted into the butted planes to be jointed of ceramic bodies, at least one of which is in an electric conduction or between a metal body and a ceramic body in such an arrangement of facing the insulating ceramic layer to the electric conductive body to be jointed. The electric conductive ceramic of the inserting member for heati
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Y. Ebata, et al., Electrical Joining of Silicon Nitride Ceramics, Jan. 1989, pp. 83-85.
Hoshino Hisakiyo
Miyake Natsumi
Nishi Tokumitsu
Okuda Kouji
Takai Hiroshi
Daihen Corporation
DeSimone Mark
Jones W. Gary
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