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SiAlON/SiC Micro-Nano-Composites
Abstract Mixed (α+β)-SiAl0N/SiC ceramic composites were prepared from Si/N/C laser-formed nanopowders containing 3.2 wt% oxygen as an impurity. To reach higher green density, the experimental procedure for processing of ultrafine powders in compact body was improved using an phosphate ester as dispersant and glycerol trioleate as binder. The pressureless sintering and hot-pressing results showed that mixed (α+β)-SiAl0N/SiC composites can be prepared by addition of appropriate amount of YN; by addition of crystalline Si3N4 to amorphous Si/N/C powder or by applying a high heating rates ( > 500°C/min) and so decreasing the formation of intermediate β-SiAl0N. After densification by hot-pressing, very fine microstructure (∼100 nm) was observed in the dense SiAlON/SiC composites. Satisfactory values of hardness (HV ≤ 21 GPa) and fracture toughness (KIC ≤ 7.3 MPam1/2) were determined.
SiAlON/SiC Micro-Nano-Composites
Abstract Mixed (α+β)-SiAl0N/SiC ceramic composites were prepared from Si/N/C laser-formed nanopowders containing 3.2 wt% oxygen as an impurity. To reach higher green density, the experimental procedure for processing of ultrafine powders in compact body was improved using an phosphate ester as dispersant and glycerol trioleate as binder. The pressureless sintering and hot-pressing results showed that mixed (α+β)-SiAl0N/SiC composites can be prepared by addition of appropriate amount of YN; by addition of crystalline Si3N4 to amorphous Si/N/C powder or by applying a high heating rates ( > 500°C/min) and so decreasing the formation of intermediate β-SiAl0N. After densification by hot-pressing, very fine microstructure (∼100 nm) was observed in the dense SiAlON/SiC composites. Satisfactory values of hardness (HV ≤ 21 GPa) and fracture toughness (KIC ≤ 7.3 MPam1/2) were determined.
SiAlON/SiC Micro-Nano-Composites
Lenčéš, Z. (author) / Haviar, M. (author)
1997-01-01
9 pages
Article/Chapter (Book)
Electronic Resource
English
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