Morphology and Reaction Mechanism of AlN Fibers Synthesized by Carbothermal Reduction

Chun Ying Shen; Tai Qiu; Yu Ming Lu

doi:10.4028/www.scientific.net/KEM.280-283.1399

Paper Titles

Synthetic of Zr₂Al₃C₅ Material
p.1379

Reaction Synthesized Boron Nitride-Containing Composites (BNCC)
p.1385

Sintering of Vitrified Bond CBN Grinding Tool
p.1391

Study on the Performance of CBN Abrasives with Ti Coatings
p.1395

Morphology and Reaction Mechanism of AlN Fibers Synthesized by Carbothermal Reduction
p.1399

Thermodynamics and Kinetic Considerations behind the Growth of AlN Whiskers Synthesized by Carbothermal Reduction
p.1403

Influence of Powder Characteristics on Sintering of AlN Ceramics
p.1409

Effect of Grain Growth Inhibitor on the Microstructure and Mechanical Properties of Ti(C,N)-Based Cermet
p.1413

Study of Ti(C,N)-Based Cermets Fabricated by Pressureless-HIP Sintering
p.1417

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Morphology and Reaction Mechanism of AlN Fibers Synthesized by Carbothermal Reduction

Abstract:

AlN fibers were synthesized by carbothermal reduction using Al2O3 fibers as starting material. The N content of AlN fibers synthesized at 1780°C was more than 31%. The morphology and microstructure of AlN fibers were studied with XRD, SEM and TG-DSC. The fibers containing small AlN grains were pipe-shaped, in which the particle size is about 1µ, diameter 4 ~ 6µ, length/diameter ratio 20 ~ 30. The main reaction process is as follows: Firstly, alumina is reduced by carbon to lower-valent aluminum oxide, which further reacts with nitrogen and forms AlN. Secondly, when the alumina fibers are coated by AlN layer, the reaction takes place simultaneously on both interfaces of the AlN layer.