Termination feedthrough unit with ceramic insulator suitable for vacuum and corrosive applications

A method for making an insulated electrical feedthrough or electrical termination unit, said method comprising the steps of:

• putting aluminum into a hole in a ceramic piece, said ceramic piece having a first end and a second end, said hole providing an opening in said ceramic piece at the first end;
• brazing the aluminum to create an aluminum rod within said ceramic piece joined with a hermetic joint between the aluminum and an inner surface of said hole in said ceramic piece;
• removing a center of the aluminum rod to create an aluminum tube within said ceramic piece;
• and
• removing a first portion of said ceramic piece at said first end of said ceramic piece to expose a portion of an outer surface of the aluminum tube, thereby resulting in the aluminum tube with a second portion of the aluminum tube hermetically joined along the outer surface of said aluminum tube to an interior of said hole within said ceramic piece within the center of an annular of said ceramic piece at the first end.