Park Na-Ra, Cho Woo-Jin, Kim Seong-Eun, Shon In-Jin
Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
Division of Advanced Materials Engineering and the Research Center of Hydrogen Fuel Cell, Engineering College, Chonbuk National University, 561-756, Republic of Korea.
J Nanosci Nanotechnol. 2019 Apr 1;19(4):2295-2297. doi: 10.1166/jnn.2019.15982.
ZrB₂ powders were milled using high-energy ball for various durations and consolidated using the pulsed current activated sintering (PCAS). The effects of milling on the sintering behavior and crystallite size ZrO₂ powders were investigated. A nanostructured dense ZrB₂ specimen with a relative density of up to 97% was readily achieved within 3 min. The ball milling effectively refined the crystallite structure of ZrB₂ powders and facilitated the subsequent consolidation. The sinter-onset temperature was reduced appreciably by the prior milling for 10 h. Accordingly, the relative density of ZrB₂ compact increases as the milling time increases. The hardness and fracture toughness of sintered ZrB₂ increased as the density increases.
使用高能球磨机对ZrB₂粉末进行不同时长的球磨，并采用脉冲电流活化烧结（PCAS）进行固结。研究了球磨对ZrO₂粉末烧结行为和晶粒尺寸的影响。在3分钟内即可轻松获得相对密度高达97%的纳米结构致密ZrB₂试样。球磨有效地细化了ZrB₂粉末的微晶结构，并促进了后续的固结。预先球磨10小时可显著降低烧结起始温度。因此，ZrB₂压块的相对密度随球磨时间的增加而增加。烧结ZrB₂的硬度和断裂韧性随密度的增加而提高。
