Effect of wear debris of Al2O3, ZrO2 and WC balls on Y-alpha/beta-SiAlON ceramics consolidated by spark plasma sintering

Title
Effect of wear debris of Al2O3, ZrO2 and WC balls on Y-alpha/beta-SiAlON ceramics consolidated by spark plasma sintering
Author(s)
김석영천성수민봉기한영환김영문[김영문]이경석[이경석]정영근[정영근]김광호[김광호]김영기[김영기]
Keywords
SILICON-NITRIDE CERAMICS; ADDITIVES; FRACTURE; PHASE
Issue Date
201303
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v.19, no.2, pp.163 - 169
Abstract
Three types of Y-alpha/beta-SiAlON powders were prepared by mixing and milling the raw materials for 20 h using Al2O3, ZrO2, and WC balls, thereafter denoted as SNA, SNZ and SNW, respectively. The three types of specimens were sintered using spark plasma sintering (SPS) at 1510 A degrees C for 5 min under 30 MPa in a vacuum. alpha-phases (SiAlON and Si3N4) and beta-SiAlON phase were observed in the SNA and SNZ specimens, but only the beta-SiAlON phase existed in the SNW specimen. The wear debris of the WC balls affected the grain boundary properties and eventually promoted the full phase transformation of alpha-Si3N4 into alpha- and beta-SiAlON phases. However, SNA and SNZ were partially transformed into alpha- and beta-SiAlON phases. The Vickers hardness of SNA was the highest (18.7 GPa), due to its having the highest content of alpha-phase, but its fracture toughness was the lowest (4.09 MPam(1/2)) due to its having the lowest content of beta-SiAlON phase. The wear debris and secondary phases existed at the grain boundary, mostly at the triple junction, and also affected the color. The color of the sintered specimen was quite different depending on the milling media.
URI
http://hdl.handle.net/YU.REPOSITORY/26256http://dx.doi.org/10.1007/s12540-013-2005-2
ISSN
1598-9623
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공과대학 > 신소재공학부 > Articles
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