紀要論文

紀要論文

text

Transactions of JWRI. 2006, 35(2), p. 43-46

Self-Propagating High-temperature Synthesis of AIN Nanostructures and Their Sintering Properties

英語

text

2006-12

This investigation describes novel growth of quasi-aligned aluminum nitride (AlN) nanofibers by the self-propagating high-temperature synthesis (SHS) under low nitrogen pressure. The starting charge consists of Al and AlN diluent (40/60 mole%) with a mixture of Y₂O₃ and NH₄Cl additives (5wt% each). The combustion reaction was performed under 0.25 MPa N₂ pressure. The microstructure of as-synthesized AlN powder consists of two major types; aggregates of irregular particles (~0.5 μm, the same as the original AlN diluent) and balls-like grains (same size and shape as original Al particles) consisting of a thin crust (≤150 nm) covering unique quasi-aligned AlN nanofibers grown in the interior. This powder can be easily consolidated to near theoretical density without sintering additives in a period of 5 min at 1600 ℃ using the spark plasma sintering (SPS) process. The microstructure of sintered AlN was homogeneous with dual morphologies of many ultrafine sub-grains (fibers, nanometer size in diameter) aggregated in large grains. The thermal conductivity was 91 W/m-K.

10.18910/8996

8996

Self-Propagating High-temperature Synthesis of AIN Nanostructures and Their Sintering Properties

大阪大学接合科学研究所

英語

2006-12

Transactions of JWRI

35

2

43

46

https://hdl.handle.net/11094/8996

10.18910/8996

https://doi.org/10.18910/8996