Synthesis and electromagnetic wave reflectivity of Si3N4 ceramic with gradient Fe3O4 distribution. Issue 8 (June 2016)

• Record Type: Journal Article
• Authors: Li, Xiangming; Gao, Mingjun; Jiang, Yun
• Is Part Of: Ceramics international. Volume 42:Issue 8(2016)
• Page Start: 9636
• Page End: 9639
• Publication Date: 2016-06
• Subjects: Si3N4 -- Fe3O4 -- Gradient distribution -- Chemical precipitation -- Electromagnetic properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.03.049
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A Si3 N4 ceramic with gradient distribution of tri–iron tetroxide (Gradient–Si3 N4 –Fe3 O4 ) was fabricated with a combined technique of chemical precipitation and directional infiltration. Electromagnetic wave could enter Gradient–Si3 N4 –Fe3 O4 with little reflection because of weak impedance mismatch at its surface. Also the electromagnetic wave entering the Gradient–Si3 N4 –Fe3 O4 propagated with small reflection due to continuous and gradual change of impedance resulting from the gradient Fe3 O4 distribution, and was absorbed completely by Fe3 O4 of the gradient structure.