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Synthesis of Ultrafine Hafnium Diboride Powders Using Solution‐Based Processing and Spark Plasma Sintering
Author(s) -
Wang Hailong,
Lee SeaHoon,
Kim HaiDoo,
Oh HyeonCheol
Publication year - 2013
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12016
Subject(s) - spark plasma sintering , materials science , hafnium , sintering , crystallite , chemical engineering , grain growth , metallurgy , carbon fibers , atmospheric temperature range , grain size , composite material , composite number , zirconium , engineering , physics , meteorology
Ultrafine hafnium diboride (HfB 2 ) powders were synthesized by the boro/carborthermal reduction process. Fine‐scale mixing of the reactants was achieved by solution‐based processing using hafnium oxychloride (Hf OC l 2 ·8H 2 O) and phenolic resin as the precursor of HfO 2 and carbon respectively. The heat treatment was completed at a temperature range 1300–1500°C for 1h using spark plasma sintering ( SPS ) apparatus. The crystallite sizes of the synthesized powders were small (<500 nm) and the oxygen content was low (0.85 wt%). The grain growth of HfB 2 could be effectively suppressed using SPS due to the fast heating rate. The effects of temperature and holding time on the synthesis of ultrafine HfB 2 powders were discussed.