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JOURNAL OF MATERIALS SCIENCE LETTERS 19 2000 1011 – 1014 Densification of liquid-phase-sintered silicon carbide ¤ z V. V. PUJAR , R . P . JENSEN , N . P . PADTURE Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06268-3136, USA E-mail: npadture@mail.ims.uconn.edu There has been growing interest in pressureless liquid- Also, in most prior sintering studies on LPS SiC, the phase sintering (LPS) of SiC, with Al O additions [1] densities were measured using the Archimedes princi- 2 3 or simultaneous Al O and Y O (or rare earth oxides) ple, and the reference theoretical densities were calcu- 2 3 2 3 additions [2–6], as it allows sintering at lower tempera- lated assuming the presence of certain expected phases tures (1850 to 1950 C) relative to solid-state sintering. in specific concentrations and using the rule of mix- A particularly important aspect of this class of materi- tures. Since the actual vol% of the liquid phase, which als is that they can be significantly toughened through is likely to consist of an indeterminate mixture of dif- careful microstructure design, wherein elongated SiC ferent phases (crystalline and glassy), is not known grain-reinforcements
Journal of Materials Science Letters – Springer Journals
Published: Oct 6, 2004
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