Effects of Initial Powder Size on the Densification of Barium Titanate Ceramics Prepared by Microwave‐Assisted Sintering. Issue 4 (24th January 2015)

• Record Type: Journal Article
• Authors: Yun, Han‐Sol; Kim, Hyo‐Han; Jeong, Dae‐Yong; Cho, Nam‐Hee; Chan, H.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 4(2015)
• Page Start: 1087
• Page End: 1094
• Publication Date: 2015-01-24
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13464
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13464-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The effects of initial powder size on microwave‐assisted sintering (MWS) were investigated. BaTiO₃ powders with an average particle size of 50, 100, and 500 nm were prepared and sintered with MWS and conventional heating‐based sintering (CS). Samples of the 50 ‐ and 100‐nm‐sized BaTiO₃ powders were mechanically milled to study the effects of powder crystallinity on microwave absorption during the MWS process. The MWS of the 50‐nm‐sized BaTiO₃ powder resulted in a relative mass density of more than 90% when sintered at 1050°C, whereas the same density was achieved at 1200°C with CS. This difference between the optimal sintering temperatures, which is caused by the absorption of microwaves, was not observed when the 500‐nm‐sized BaTiO₃ powder was used. The sinterability of the BaTiO₃ ceramics prepared through the MWS of mechanically milled, 50‐nm‐sized powders decreased with increasing milling time. However, the sinterability was much higher than that of the BaTiO₃ ceramics prepared through the MWS of the 100‐ and 500‐nm‐sized unmilled powders. In conclusion, microwave absorption has significant effects on the sintering behavior of ~50‐nm‐sized powders, but is negligible for 500‐nm‐sized powders.</p> </abstract>