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Synthesis of sub-micro sized high purity zirconium diboride powder through carbothermal and borothermal reduction method

Title
Synthesis of sub-micro sized high purity zirconium diboride powder through carbothermal and borothermal reduction method
Author
최성철
Keywords
Zirconium diboride; Synthesis; Purity; Morphology; Boron carbide reduction
Issue Date
2017-06
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v. 43, no. 8, page. 5896-5900
Abstract
Sub-micro sized zirconium diboride (ZrB2) powders were successfully prepared via the boro/carbothermal reduction method using zirconium oxide and boron carbide as the primary raw materials. The prepared mixtures were thermally reacted at 1250 degrees C for 1 h. The optimized composition range containing the lowest oxide and carbide impurity, which was 0.14% of oxygen and 0.3% of carbon contents, was determined using crystallographic and elemental analysis. The particle size was reduced from 5 pm to 245 nm by the addition of B4C as a reductant within a composition range that maintained the highest purity. The morphology changed from faceted to angular hexagonal bar-like with a simultaneous growth in particle size. Changes in the particle structure were a result of the existing liquid B2O3 phase during the reaction. The 245-nm particles contained 12.1% oxygen content and 16.2% oxygen content for the 5-mu m particle in the circumstance in which limited oxides could be produced.
URI
https://www.sciencedirect.com/science/article/pii/S0272884217300809?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/114455
ISSN
0272-8842; 1873-3956
DOI
10.1016/j.ceramint.2017.01.068
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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