Manufacturing Investigation for Improved Forming of Boron Carbide
AVCO CORP LOWELL MA SYSTEMS DIV
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ATERIALS, ARMOR, DENSITY, COST EFFECTIVENESSARMOR, LIGHTWEIGHT, BORON CARBIDESLightweight, high modulus boron carbide was hot pressed to a density 98 percent of theoretical by alloying additions at a temperature of 1750C and a pressure of 3500 psi. The additives used were 5 percent sodium silicate and 0.5 percent magnesium oxide, added as magnesium nitrate and the mixture was ball milled with steel balls which introduced some iron in the final composition. Microstructure analysis indicated ultrafine-grained structure with average grain size of 0.55 micron. The process has been scaled up to provide 6 in. x 6 in. x 38 in. thick tiles, and eight tiles were supplied to AMMRC for ballistic evaluation, which will be the subject of a separate report.
- Ceramics, Refractories and Glass