Pressureless Sintering of Carbon-coated Zirconium Diboride Powders
Carbon-coated zirconium diboride powders were sintered to near theoretical density at temperatures as low as 1900 °C without an external pressure. Relative density increased from not, vert, similar70% for uncoated ZrB2 to >99% for ZrB2 coated with at least 1.0 wt% carbon. Thermodynamic analysis indicated that carbon reacted with and removed oxide impurities (ZrO2 and B2O3) that were present on the particle surfaces, which promoted densification by minimizing grain coarsening. The effects of initial particle size and carbon content on densification, microstructure, and properties were investigated.
S. Zhu et al., "Pressureless Sintering of Carbon-coated Zirconium Diboride Powders," Materials Science and Engineering A, Elsevier, Jun 2007.
The definitive version is available at http://dx.doi.org/10.1016/j.msea.2007.02.116
Materials Science and Engineering
National Science Foundation (U.S.)
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