Synthesis of sub-micro sized high purity zirconium diboride powder through carbothermal and borothermal reduction method. Issue 8 (1st June 2017)

• Record Type: Journal Article
• Authors: An, Gye Seok; Han, Jin Soon; Hur, Jae Uk; Choi, Sung-Churl
• Is Part Of: Ceramics international. Volume 43:Issue 8(2017)
• Page Start: 5896
• Page End: 5900
• Publication Date: 2017-06-01
• Subjects: Zirconium diboride -- Synthesis -- Purity -- Morphology -- Boron carbide reduction; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.01.068
• Languages: English
• ISSNs: 0272-8842

Abstract

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 °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 µm to 245 nm by the addition of B4 C 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 B2 O3 phase during the reaction. The 245-nm particles contained 12.1% oxygen content and 16.2% oxygen content for the 5-μm particle in the circumstance in which limited oxides could be produced.