EP 1146523 A2 20011017 - Black oxide-containing coaxial cable and method of making the same
Title (en)
Black oxide-containing coaxial cable and method of making the same
Title (de)
Koaxialkabel mit schwarzem Oxid und zugehöriges Herstellungsverfahren
Title (fr)
Câble coaxial contenant de l'oxyde noire et sa méthode de fabrication
Publication
Application
Priority
US 54103700 A 20000331
Abstract (en)
The coaxial cable (10) has a metallic signal-transmitting core (12), a dielectric component (14) which is resistant to temperatures of at least about 1000 degrees C., preferably 1000-1100 degrees C., surrounding the core, and a sheath (16) of stainless steel surrounding the dielectric component and core. The outer surface (20) of the sheath (16) has an adherent protective black oxide layer (22) which comprises chromium oxide, preferably in the form of chromic oxide, with essentially the remainder of the black oxide layer being iron oxide. The stainless steel sheath (16) preferably has about 18-20 weight percent of chromium with essentially the remainder being iron. The black oxide layer (22) is formed on the outer surface (20) of the assembled coaxial cable (18), in accordance with the present method, by passing the coaxial cable through a furnace having a hydrogen-free, wet-nitrogen atmosphere, at a temperature of at least about 1000 degrees C., preferably about 1000-1100 degrees C., and for a residence time in the furnace of about two to about five minutes. <IMAGE>
IPC 1-7
IPC 8 full level
H01B 11/18 (2006.01); H01B 13/22 (2006.01)
CPC (source: EP)
H01B 11/1808 (2013.01); H01B 11/1882 (2013.01); H01B 13/225 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1146523 A2 20011017; EP 1146523 A3 20020213; EP 1146523 B1 20040922; AT E277413 T1 20041015; DE 60105683 D1 20041028
DOCDB simple family (application)
EP 01303110 A 20010402; AT 01303110 T 20010402; DE 60105683 T 20010402