Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 30, Issue 9, Pages 1945-1954Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2010.02.026
Keywords
Hot-pressing; Strength; Toughness and toughening; SiC
Categories
Ask authors/readers for more resources
Dense SiC (97.3-99.2% relative density) of 1.1-3.5 mu m average grain size was prepared by the combination of colloidal processing of bimodal SiC particles with sintering additives (Al2O3 plus Y2O3, 2-4 vol%) and subsequent hot-pressing at 1900-1950 degrees C. The fracture toughness of SiC was sensitive to the grain boundary thickness which was controlled by grain size and amount of oxide additives. A maximum fracture toughness (6.2 MPa m(1/2)) was measured at 20 nm of grain boundary thickness. The mixing of 30 nm SiC (25 vol%) with 800 nm SiC (75 vol%) was effective to reduce the flaw size of fracture origin, in addition to a high fracture toughness, leading to the increase of flexural strength. However, the processing of a mixture of 30 nm SiC (25 vol%)-330 nm SiC (75 vol%) provided too small grains (1.1 mu m average grain size), resultant thin grain boundaries (12 nm), decreased fracture toughness, and relatively large defect of fracture origin, resulting in the decreased strength. (C) 2010 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available