公开(公告)号：US3585008A

公开(公告)日：1971-06-15

申请号：US3585008D

申请日：1967-09-22

Applicant: SIEMENS AG

Inventor： KELLER WOLFGANG ,  KRAMER HERBERT

IPC: C30B13/20 ,  B01J17/10

CPC classification number: C30B13/20

Abstract: METHOD OF CRUCIBLE-FREE ZONE MELTING A CRYSTALLINE ROD WHICH COMPRISES SUCCESSIVELY PASSING ALONG THE ROD IN THE AXIAL DIRECTION THEREOF AN ADVANCE MELTING ZONE FORMED IN THE ROD TO A DEPTH SMALLER THAN THE RADIAL THICKNESS OF THE ROD AND A SUBSEQUENT MELTING ZONE FORMED IN THE ROD AND EXTENDING ACROSS THE ENTIRE CROSS SECTION OF THE ROD.

公开(公告)号：US3563810A

公开(公告)日：1971-02-16

申请号：US3563810D

申请日：1969-06-12

Applicant: SIEMENS AG

Inventor： KELLER WOLFGANG ,  KRAMER HERBERT

IPC: C30B13/20 ,  C30B15/08 ,  B01J17/10

CPC classification number: C30B15/08 ,  C30B13/20 ,  Y10S117/91 ,  Y10T117/1032 ,  Y10T117/1072

Abstract: METHOD OF FLOATING ZONE MELTING A VERTICALLY MOUNTED ROD AND SIMULTANEOUSLY STRETCHING THE MOLTEN ZONE FOR REDUCING THE ROD IN CROSS SECTION INCLUDES PLACING AROUND THE TOP OF A THIN CRYSTAL SEED AN INDUCTION HEATER COIL HAVING TURNS OF A DIAMETER LARGER THAN THE THICKNESS OF THE THIN CRYSTAL SEED, FORMING THE LOWER END OF A THICK ROD HAVING A DIAMETER GREATER THAN 25 MM. A GREATER THAN THE DIAMETER OF A PLURALITY OF INNER TURNS OF THE COIL BUT SMALLER THAN THE DIAMETER OF AT LEAST ONE OF THE OUTER TURNS OF THE COIL APPROXIMATELY INTO THE SHAPE OF THE MOLTEN ZONE TO BE PRODUCED BY THE COIL, CONTACTING THE LOWER END OF THE THICK ROD WITH THE TOP OF THE SEED AND HEATING THE JUNCTION THEREOF WTH THE COIL SO THAT THE TURNS OF THE COIL ARE POSITIONED VERTICALLY BENEATH THE THICK PORTION, AND THEREAFTER COMMENCING THE ZONE MELTING AND STRETCHING OPERATIONS.