Patent ID: 9557197
Date: 2017-01-31
CPC Classifications: B23K,F01N,G01D

Claim:
1. A method of making a gas sensor, said method comprising: providing a metallic shell with a shell aperture extending therethrough along an axis; providing a metallic glass holder including a glass holder aperture extending axially therethrough; positioning a ceramic sensing element through said shell aperture and through said glass holder aperture; metallurgically sealing said glass holder to said shell in order to prevent gases from passing between said glass holder and said shell; and providing a glass seal which seals between said sensing element and said glass holder in order to prevent gases from passing between said sensing element and said glass holder; wherein one of said shell and said glass holder includes an annular projection extending axially therefrom and said step of metallurgically sealing said glass holder to said shell comprises: placing said projection in contact with a) said shell if said glass holder includes said projection or b) said glass holder if said shell includes said projection; and passing an electric current through said shell and said glass holder and simultaneously applying a compressive force to said projection, thereby creating heat at said projection and collapsing said projection in order to metallurgically seal said glass holder to said shell.