Method of manufacturing joint body of conductive ceramic body and metal body

Patent metadata

Field	Value
Publication number	US-9643893-B2
Application number	US-201414491378-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 20, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A method of manufacturing a joint body of a ceramic body and a metal body includes a step of joining them together by passing a current to an abutment surface between them. The joining step includes a step of heating up the abutment surface to a temperature T1 within a temperature range between (Tr-220)° C. and (Tr-50)° C. in a period longer than 10 seconds, Tr being a recrystallization temperature of the metal body, a step of heating the abutment surface for a period longer than 5 seconds at a temperature T2 within a temperature range between Tm×0.3° C. and Tm×0.45° C., Tm being a melting point of the metal body, and a step of heating the abutment surface for a period longer than 3 seconds at a heating temperature higher than Tm×0.48° C. and lower than Tm×0.6° C.

First claim

What is claimed is:

1. A method of manufacturing a joint body of a conductive ceramic body and a conductive metal body comprising:
an abutting step of abutting the ceramic body and the metal body on each other; and
a joining step of joining the ceramic body and the metal body to each other by applying a voltage between the ceramic body and the metal body to pass a current to an abutment surface between the ceramic body and the metal body to thereby heat the abutment surface,

wherein the joining step includes:
a first electrical heating step of heating up the abutment surface to a predetermined temperature T1 within a temperature range between (Tr-220)° C. and (Tr-50)° C. in a period longer than 10 seconds, Tr being a recrystallization temperature of the metal body;
a second electrical heating step of increasing the temperature of the abutment surface from the temperature of T1 and heating the abutment surface for a period longer than 5 seconds at a predetermined temperature T2 within a temperature range between Tm×0.3° C. and Tm×0.45° C., Tm being a melting point of the metal body; and
a third electrical heating step of increasing the temperature of the abutment surface from the temperature of T2 and heating the abutment surface for a period longer than 3 seconds at a heating temperature higher than Tm×0.48° C. and lower than Tm×0.6° C.

2. The method of manufacturing a joint body according to claim 1 , wherein the temperature T1 is between 280 and 450° C., the temperature T2 is between 550 and 750° C., and the heating temperature in the third electrical heating step is between 820 and 950° C.

3. The method of manufacturing a joint body according to claim 2 , wherein the heating temperature in the third electrical heating step is between 875 and 950° C.

4. The method of manufacturing a joint body according to claim 1 , wherein, in each of the first to third electrical heating steps, control of heating temperature is performed by controlling the current passed to the abutment surface.

5. The method of manufacturing a joint body according to claim 1 , wherein the ceramic body is made mostly of SiC or SiC—Si composite material, and the metal body is made mostly of Ti or Ti-alloy.

6. The method of manufacturing a joint body according to claim 1 , wherein an additional conductive member is joined to or abutted on a surface of the metal body opposite to the abutment surface of the metal body and the ceramic body.

7. The method of manufacturing a joint body according to claim 1 , wherein the joint body is a vehicle mounted part to be mounted in an exhaust gas passage.

Assignees

• Denso Corp

Inventors

• Shirai Hideaki
• Shimizu Tomohiro
• Ookouchi Yasuyuki

Classifications

• H05B3/42

  non-flexible · CPC title

• C04B37/021 Primary

  in a direct manner, e.g. direct copper bonding [DCB] · CPC title

• H05B3/141

  Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds · CPC title

• C04B2237/80

  Joining the largest surface of one substrate with a smaller surface of the other substrate, e.g. butt joining or forming a T-joint · CPC title

• C04B2237/403

  Refractory metals · CPC title