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Nano‐Hafnium Diboride Powders Synthesized Using a Spark Plasma Sintering Apparatus
Author(s) -
Wang Hailong,
Lee SeaHoon,
Kim HaiDoo
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05141.x
Subject(s) - spark plasma sintering , materials science , boride , boron , hafnium , sintering , metallurgy , grain size , nano , boro , particle size , chemical engineering , analytical chemistry (journal) , composite material , chemistry , zirconium , organic chemistry , engineering , chromatography
Nano‐hafnium diboride powder was synthesized by boro/carborthermal reduction process of HfO 2 using a spark plasma sintering ( SPS ) apparatus. The agglomerated product was found to be 1–2 μm in size, which was composed with small primary particles of 100–200 nm in size. The particle size of HfO 2 played an important role to produce the nano‐boride powder. In addition, the grain growth of HfB 2 could be effectively suppressed by using SPS due to the fast heating rate. The synthesized powder had a low oxygen content (~0.66 wt%). Excessive B 4 C and C were necessary during the boro/carborthermal reduction in HfO 2 process because of the volatilization of boron as a form of B 2 O 3 and the reduction in residual HfO 2 .