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Synthesis of Pure YB 4 Powder via the Reaction of Y 2 O 3 with B 4 C
Author(s) -
Li Junguo,
Peng Aiyi,
He Yong,
Yuan Huiping,
Guo Qilong,
Shen Qiang,
Zhang Liangmeng
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.1551-2916.2012.05272.x
Subject(s) - stoichiometry , molar ratio , analytical chemistry (journal) , nuclear chemistry , chemistry , materials science , catalysis , chromatography , organic chemistry
Pure YB 4 powder was synthesized via the reaction of Y 2 O 3 with B 4 C under a vacuum pressure within the range of 20–50 Pa using spark plasma sintering ( SPS ) route. The effect of temperature and the molar ratio of the starting materials was studied. The role of the YBO 3 , an intermediate product, in the synthesis of YB 4 was investigated. For preparation of high purity YB 4 , the molar proportion of B 4 C to Y 2 O 3 should not be higher than the stoichiometric ratio (15/7). YBO 3 can be removed through decomposing to Y 2 O 3 and B 2 O 3 or reacting with B 4 C to form YB 4 and B 2 O 3 at a temperature above 1650°C. The little residual impurities, such as Y 2 O 3 and YBO 3 , can be removed by hydrochloric acid washing. Thus, a high purity YB 4 powder has been synthesized. The oxygen content of the obtained YB 4 is about 0.007% and the particle size is in the range of 3–10 μm.