초록 ▼

A mineral-insulated cable termination offering hermetic sealing of the cable end at temperatures in excess of 300.degree. C. having a metal spacer or extension sealed to the cable sheath which matches the cable conductor in thermal expansion, and a high-expansion, refractory glass, ceramic, or glass

A mineral-insulated cable termination offering hermetic sealing of the cable end at temperatures in excess of 300.degree. C. having a metal spacer or extension sealed to the cable sheath which matches the cable conductor in thermal expansion, and a high-expansion, refractory glass, ceramic, or glass-ceramic seal filling the gap between and sealed to each of the spacer and the cable sheath, the termination offering stable protection for the cable insulation under corrosive high-temperature operating conditions.

대표청구항 ▼

[ We claim:] [1.] A hermetically sealed mineral-insulated cable termination comprising:a metal cable sheath of a steel having a first coefficient of thermal expansion;at least one cable conductor of a second metal selected from the group consisting of nickel, nickel alloys, copper, and copper alloys

[ We claim:] [1.] A hermetically sealed mineral-insulated cable termination comprising:a metal cable sheath of a steel having a first coefficient of thermal expansion;at least one cable conductor of a second metal selected from the group consisting of nickel, nickel alloys, copper, and copper alloys, spaced from the metal cable sheath, the second metal having a second coefficient of thermal expansion differing from the first coefficient of thermal expansion;a metal spacer hermetically attached to the sheath, the spacer being formed of a metal having a coefficient of thermal expansion substantially equivalent to the second coefficient of thermal expansion and being separated from the cable conductor by a gap; andan impervious ceramic sealing member composed of a crystalline, refractory, high-expansion alkali aluminosilicate glass-ceramic filling the gap and being hermetically sealed to both the spacer and the cable conductor;whereby the termination exhibits improved service life in vibrationally severe environments under thermal cycling from below-freezing temperatures up to as high as 1000.degree. C.