ZrB2 powders with low oxygen content: Synthesis and characterization

A two-step reduction route is proposed for well-dispersed submicrometer ZrB2 powder synthesis with low oxygen content. The second synthesis step can reduce the oxygen content apparently, whereas presents minor adverse effects on particle size and dispersion of ZrB2 powders. The samples were mainly characterized by an oxygen-nitrogen analyzer and X-ray diffractometer (XRD). It can be determined that the adsorbed oxygen constitutes a low proportion of total oxygen content based on the release profile of oxygen and nitrogen contents. Besides, the oxygen content calculated based on XRD characterization is significantly lower than the total oxygen content measured by impulse-thermal conductivity. Furthermore, the lattice constants were determined according to XRD patterns as being higher than the calculated theoretical values based on the First-Principles, indicating that a portion of oxygen remains in ZrB2 powders in the form of interstitial impurity atoms.

[1]  P. Lu,et al.  Oxygen contamination on the surface of ZrB2 powders and its removal , 2017 .

[2]  Weiming Guo,et al.  Synthesis of fine ZrB2 powders by new borothermal reduction of coarse ZrO2 powders , 2016 .

[3]  Fangli Yuan,et al.  Large‐scale production of well‐dispersed submicro ZrB2 and ZrC powders , 2016 .

[4]  F. Liang,et al.  Preparation and characterization of ZrB2–SiC composite powders from zircon via microwave-assisted boro/carbothermal reduction , 2015 .

[5]  H. Sarpoolaky,et al.  Novel synthesis of ZrB2 powder by low temperature direct molten salt reaction , 2015 .

[6]  Mehdi Shahedi Asl,et al.  Significance of hot pressing parameters and reinforcement size on sinterability and mechanical properties of ZrB2–25 vol% SiC UHTCs , 2015 .

[7]  B. Zou,et al.  In situ synthesis and formation mechanism of ZrC and ZrB2 by combustion synthesis from the Co-Zr-B4C system , 2015 .

[8]  Chen-Gui Lu,et al.  RF thermal plasma-assisted metallothermic synthesis of ultrafine ZrB2 powders , 2015 .

[9]  Mehdi Shahedi Asl,et al.  Taguchi analysis on the effect of hot pressing parameters on density and hardness of zirconium diboride , 2015 .

[10]  F. Gotor,et al.  In-situ synthesis of a ZrB2–based composite powder using a mechanochemical reaction for the zircon/magnesium/boron oxide/graphite system , 2015 .

[11]  V. V. B. Prasad,et al.  Synthesis of ZrB2–SiC composite powder in air furnace , 2014 .

[12]  K. Ray,et al.  Effect of SiC content, additives and process parameters on densification and structure–property relations of pressureless sintered ZrB2–SiC composites , 2013 .

[13]  Bin Li,et al.  Prediction and analysis of microstructural effects on fabrication of ZrB2/(Ti,W)C composites , 2013 .

[14]  H. Nersisyan,et al.  Preparation of zirconium-based ceramic and composite fine-grained powders , 2012 .

[15]  Guo‐Jun Zhang,et al.  New Borothermal Reduction Route to Synthesize Submicrometric ZrB2 Powders with Low Oxygen Content , 2011 .

[16]  Jun-ping Li,et al.  Nanocarbon-dependent synthesis of ZrB2 in a binary ZrO2 and boron system , 2011 .

[17]  Jun-ping Li,et al.  Morphology evolution of ZrB2 nanoparticles synthesized by sol–gel method , 2011 .

[18]  A. K. Suri,et al.  Investigations on synthesis of ZrB2 and development of new composites with HfB2 and TiSi2 , 2011 .

[19]  N. Padture,et al.  Improved processing and oxidation-resistance of ZrB2 ultra-high temperature ceramics containing SiC nanodispersoids , 2007 .

[20]  G. Hilmas,et al.  Pressureless sintering of carbon-coated zirconium diboride powders , 2007 .

[21]  William G. Fahrenholtz,et al.  Refractory Diborides of Zirconium and Hafnium , 2007 .

[22]  G. Hilmas,et al.  Pressureless Densification of Zirconium Diboride with Boron Carbide Additions , 2006 .