Search NASA⌕ Search

Engineering topics

Rexer, J.

Publications and source records attributed to Rexer, J..

17 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1983

Casting Silicon Pellets From Powder

New technique converts finely powdered silicon into solid pellets. Fine silicon powder melts in thin quartz bubble that breaks upon cooling, leaving behind crack-free pellet of silicon.

Farrier, E. G.↗
NASA NTRS1983

Compacting Silicon Powder

Silicon powder is compacted by sandwiching it between two flat sheets scaled up for production, choice of metal making contact with silicon will be important, if high purity of silicon is to be preserved.

Farrier, E. G.↗
NASA NTRS1982

Tube-Furnace Production of Silicon

Packed-bed reactor produces silicon by decomposing ultrapure silane gas in temperature gradient. Based on previous experiments with relatively low decomposition temperatures and with temperature gradients, heterogeneous decomposition will produce few fines. Fines produced are screened out and reinserted into furnace.

Farrier, E. G.↗
NASA NTRS1977

Low cost silicon solar array project silicon materials task: Establishment of the feasibility of a process capable of low-cost, high volume production of silane (step 1) and the pyrolysis of silane to semiconductor-grade silicon (step 2)

Extended operation of a small process-development unit routinely produced high quality silane in 97+% yield from dichlorosilane. The production rate was consistent with design loadings for the fractionating column and for the redistribution reactor. A glass fluid-bed reactor was constructed for room temperature operation. The behavior of a bed of silcon particles was observed as a function of various feedstocks, component configurations, and operating conditions. For operating modes other than spouting, the bed behaved in an erratic and unstable manner. A method was developed for casting molten silicon powder into crack-free solid pellets for process evaluation. The silicon powder was melted and cast into thin walled quartz tubes that sacrificially broke on cooling.

Breneman, W. C.↗