| Title | O1-SiAlON to O-SiAlON phase transformation studied using spark plasma sintering |
| Publication Type | Book |
| Year of Publication | 2003 |
| Authors | Barris, G.C., Shen Z., Nygren M., and Brown I.W.M. |
| Series Title | Key Engineering Materials |
| Volume | 237 |
| Number of Pages | 37 - 42 |
| ISBN | 10139826 (ISSN) |
| Keywords | Ceramic materials, Crystal microstructure, Hardness, Phase transitions, Pressure effects, Silicon compounds, Sintering, Spark plasma sintering (SPS), Toughness |
| Abstract | O1-sialon is a low temperature polymorph of O-sialon that can be synthesised in good yield at less than 1350°C, but rapidly transforms to O-sialon at higher temperatures, particularly in the presence of an aluminosilicate liquid phase. The O1-sialon to O-sialon phase transformation was investigated by spark plasma sintering (SPS). Dense O-sialon bodies (composition: Si1.85Al0.15O1.15N1.85, with 0 to 6 wt% Y2O3) with nano-scale microstructures and strengths of up to 860 MPa (ball on ring method) were obtained by sintering at 1400 to 1700°C for 0 to 5 minutes under an applied uniaxial pressure of 50 to 135 MPa. The effect of the O1-sialon to O-sialon phase transformation on the microstructure and properties (strength, hardness and toughness) of sintered O-sialon ceramic is examined. |
| URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-0037275747&partnerID=40&md5=3961bab52be0e0a13f83cf19bea504f1 |
