Crucible for manufacturing single crystals

Details Crucible for manufacturing single crystals Crucible for manufacturing single crystals

1993-01-07

1994-02-08

Kunemund, Robert

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including specific material of construction

1566171, 1566204, 156DIG64, 422249, C30B 3500

Patent

active

052846318

ABSTRACT:
A crucible including a cylindrical partition member arranged concentrically therein for use in a silicon single crystal growing apparatus. The bottom of the crucible located on the inner side of the partition member has a thickness which is not less than 1.3 times and not greater than 4 times the thickness of the partition member and it also has a porosity which is between 0 and 0.2% in its inner layer and between 0.2 and 15% in its outer layer as compared with the porosity of the partition member which is 0.2% or less. By virtue of the foregoing, a D.F. ratio (ratio of dislocation free) of 80% or over can be expected.

REFERENCES:
patent: 3649193 (1972-03-01), Deyris
patent: 4246064 (1981-01-01), Dewees et al.
patent: 4528163 (1985-07-01), Albrecht
patent: 4911895 (1990-03-01), Kida et al.
patent: 4957712 (1990-09-01), Shima et al.
patent: 5009863 (1991-04-01), Shima et al.

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