Effect of Propellant Combustion on Sapphire
AbstractSapphire (Al2O3) is the window material of choice for laser beam transmission into the combustion chamber of laser-ignited guns. To evaluate the long-term effects of propellant combustion on an Al/sub 2/O/sub 3/ laser window, it is important to know the window temperature during firing. This paper presents temperature data on an Al/sub 2/O/sub 3/ sample located in the breech face of the gun where the laser window would be in a laser-ignited 155 mm(M199) cannon. Al/sub 2/O/sub 3/ sample is a substrate material of a commercially sold thin-film thermocouple, and is therefore thermally, if not optically, representative of an actual Al/sub 2/O/sub 3/ laser window.
Barrows, A.W.; Force, B.E.; Chang, L.M.; Howard, S.L.; Beyer, R.A. & Newberry, J.E. Laser ignition testing, of two-piece tank .
ammunition for advanced tank cannon systems (ATACS). US Army Research Laboratory, Aberdeen Proving Ground, MD, 1994. Report No. ARL-TR-474.
Schmid, F.; Khattak, C.P. & Felt, D,M. Producing large sapphire for optical applications. Am. Ceram. Soc. Bull., 1994,73 (2).
Harris, D.C. & Schmid, F. Mechanical strength of sapphire at elevated temperature. Proceedings of the 6th DOD Electromagnetic Windows Symposium, 1995.
Newcomb, S.A. & Tressler, R.E. Slow crack growth in sapphire fibres at 800-1500 °C. J. Am. Ceram. Soc., 1993, 76, 2505-512.
Breval, E.; Srikanth, V. & Subbarao, E.C. Acoustic emission and microcracking in sapphire, sintered Al2O3, AIIAl203 composite, and aluminium. J. Am. Ceram. Soc., 1995, 78,
Chervin, l.C.; Syfosse, G. & Besson, l.M. Mechanical strength of sapphire windows under pressure. Rev. Sci.lnstrum., 1994, 65, 2719-725.
Medtherm Corporation. Measure surface temperature with a response time as little as 1 microsecond. Bulletin 500, 1994, Huntsville, AL, USA.
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