Sintering of α-Al₂O₃ nanocrystalline ceramic from large α-Al₂O₃ polycrystalline nanoparticles

详细信息    查看全文

• 作者：Wenbin Cao ; Xuan Mao ; Lu Li ; Bing Wang ; Qian Guo ; Jiangong Li ; ^{lijg@lzu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Alumina ; Nanocrystalline ceramics ; Polycrystalline nanoparticles ; Sintering
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1378-1382
• 全文大小：934 K

文摘

Fine nanoparticles (NPs) exhibit higher sintering activity than large ones and are usually desired for sintering of nanocrystalline (NC) ceramics with fine grains. This paper demonstrates that large α-Al₂O₃ polycrystalline (PC) NPs with a mean particle size of 62 nm show a similar sintering activity as α-Al₂O₃ single-crystal (SC) NPs with a mean particle size of 16 nm.α-Al₂O₃ NC ceramics sintered from the 62 nm α-Al₂O₃ PC NPs and 16 nm α-Al₂O₃ SC NPs by two-step sintering exhibit a similar mean grain size of about 75 nm and a similar relative density of about 99.5%. It may be because the 62 nm α-Al₂O₃ PC NPs and 16 nm α-Al₂O₃ SC NPs have a similar mean grain size of about 19 nm. These results imply that NC ceramics with fine grains may be sintered from large PC NPs with fine grain sizes.