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Effect of Iron and Boron Carbide on the Densification and Mechanical Properties of Titanium Diboride Ceramics
Author(s) -
Kang Eul Son,
Jang Cheol Woo,
Lee Chae Hyun,
Kim Chong Hee,
Kim Do Kyung
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb05993.x
Subject(s) - materials science , boron carbide , sintering , ceramic , grain growth , titanium diboride , fracture toughness , grain size , flexural strength , metallurgy , boron , microstructure , reducing atmosphere , composite material , chemistry , organic chemistry
The effect of Fe and B 4 C on the sintering behavior and mechanical properties of TiB 2 ceramics have been studied. Sintering was performed in an Ar atmosphere at 2000° using attrition‐milled TiB 2 powder (mean particle size = 0.8 μm). When a small amount of Fe (0.5 wt%) was added, abnormal grain growth occurred and the sintered density was low. In the case of B 4 C added along with 0.5 wt% Fe, however, abnormal grain growth was remarkably suppressed, and the sintered density was increased up to 95% of theoretical. But with excess Fe addition (5 wt%), B 4 C grains did not act as a grain growth inhibitor, and B 4 C grains were frequently trapped in large TiB 2 grains. The best mechanical properties were obtained for the TiB 2 –10 wt% B 4 C–0.5 wt% Fe ceramics, which exhibited a three‐point bending strength of 400 MPa and a fracture toughness of 5.5 MPa · m 1/2 .