GROWTH OF NEAR NET SHAPE SAPPHIRE DOMES USING THE HEAT EXCHANGER METHOD

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$325,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
5694
Agency Tracking Number:
5694
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
27 Congress St - Shetland Indu, Salem, MA, 01970
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Chandra P Khattak
(617) 745-0088
Business Contact:
() -
Research Institute:
n/a
Abstract
ON THE BASIS OF PERFORMANCE, SAPPHIRE IS ONE OF THE BEST MATERIALS FOR MISSILE DOME APPLICATIONS. HOWEVER, BOULE UTILIZATION AND HIGH FABRICATION COSTS MAKE IT AN EXPENSIVE CHOICE, AND, THEREFORE, NO U.S. MISSILE PRODUCTION PROGRAMS ARE USING SAPPHIRE DOMES. IT IS DESIRABLE TO GROW NEAR NET-SHAPE SAPPHIRE DOMES FOR MISSILE APPLICATIONS. IT HAS BEEN DEMONSTRATED THAT WHEN MOLYBDENUM SHEETS ARE PLACED IN THE MELT AND SAPPHIRE GROWTH IS CARRIED OUT USING THE HEAT EXCHANGER METHOD, SINGLE CRYSTAL GROWTH IS ACHIEVED IN SPITE OF SUCH PERTURBATION. WHEN DOME-SHAPED MOLYBDENUM PREFORMS WERE NESTED TOGETHER TO PRODUCE SAPPHIRE DOME BLANKS, HIGH OPTICAL QUALITY WAS PRODUCED. HOWEVER, THESE BLANKS WERE CRACKED. THE OBJECTIVE OF THE PHASE I PROGRAM WILL BE TO IDENTIFY THE CAUSE OF CRACKING AND TO DEMONSTRATE THAT CRACK-FREE, DOME-SHAPED SAPPHIRE BLANKS CAN BE PRODUCED DIRECTLY FROM THE MELT.

* information listed above is at the time of submission.

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