A study of the oxidation of ZrB2 powders during high-energy ball-milling in air
Source abstract
Abstract
Oxide impurities in ZrB2 powders promote coarsening, resulting in lower sinterability. Given its importance for sintering, we studied the oxidation of ZrB2 powders during high-energy ball-milling (the form of milling able to refine ZrB2 powders to the nanoscale) with the aid of various characterization techniques, namely fusion in inert gas, X-ray diffractometry, helium pycnometry, transmission electron microscopy, and Fourier-transform infrared, Raman, and X-ray photoemission spectroscopy. It was found that high-energy ball-milling in air introduces twice as much oxygen into the ZrB2 powders as the more conventional attrition milling. Also, this oxygen does not form solid-solutions with ZrB2, but amorphous oxides (i.e., ZrO2 and B2O3) that locate preferentially on the surface of the ultra-fine agglomerates resulting from cold-welding of the primary nano-particles that form during the ball-milling.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Bone Tissue Engineering Materials
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