Method of casting silicon into thin sheets

Details Method of casting silicon into thin sheets Method of casting silicon into thin sheets

1981-03-05

1982-10-26

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C04B 3560

Patent

active

043561411

ABSTRACT:
Silicon (Si) is cast into thin shapes within a flat-bottomed graphite crucible by providing a melt of molten Si along with a relatively small amount of a molten salt, preferably NaF. The Si in the resulting melt forms a spherical pool which sinks into and is wetted by the molten salt. Under these conditions the Si will not react with any graphite to form SiC. The melt in the crucible is pressed to the desired thinness with a graphite tool at which point the tool is held until the mass in the crucible has been cooled to temperatures below the Si melting point, at which point the Si shape can be removed.

REFERENCES:
patent: 4256681 (1981-03-01), Lindmayer
Kapur et al., Production of Silicon for Solar Cells by the Sodium Reduction of Silicon Tetrafluoride Gas, in Extended Abstracts, vol. 79-1, Abstract No. 60, The Electrochemical Society, May 1979.

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