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Mechanical Properties of Injection Molded B4C–C Ceramics

✍ Scribed by Karl A. Schwetz; Lorenz S. Sigl; Lothar Pfau

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
784 KB
Volume
133
Category
Article
ISSN
0022-4596

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✦ Synopsis

Various mechanical properties of carbon-doped boron carbide ceramics, prepared by the fabrication route, injection molding/ pressureless sintering/post-hot isostatic pressing (HIP) were investigated as a function of the sintering temperature and the carbon additive level used. An optimum combination of mechanical properties (flexural stregth, fracture toughness, Young's modulus, Knoop's hardness) is thus obtained with 100% dense and very fine grained materials (mean grain size 1-4 m) which were sintered at temperatures from 2150 to 2175°C and post-HIPed at 2050°/200 MPa Ar, having an approximate final composition of 96 B 4 C-4C (wt%).

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## Abstract A commercial thermotropic liquid crystalline polymer (LCP), Vectra A950, was injection molded into rectangular sheets of thickness ranging from 1 to 4 mm. By changing the thickness of the mold, the shear rate experienced by the TLCP melt in the mold could be varied. The 1‐mm test sample