Spark plasma sintering of ultra-porous gamma-Al2O3

作者：Toldsepp Eliko^*; Schoenstein Frederic; Amamra Mohamed; Saar Rando; Feldbach Eduard; Kanaev Andrei; Kirm Marco

来源：Ceramics International, 2016, 42(10): 11709-11715.

DOI：10.1016/j.ceramint.2016.04.089

• Sintering
• Porosity
• Al2O3
• Spark plasma sintering

Nanocrystalline gamma alumina (gamma-Al2O3) powder with a crystallite size of similar to 10 nm was synthesized by oxidation of high purity aluminium plate in a humid atmosphere followed by annealing in air. Spark plasma sintering (SPS) at different sintering parameters (temperature, dwell time, heating rate, pressure) were studied for this highly porous gamma-Al2O3 in correlation with the evolution in microstructure and density of the ceramics. SPS sintering cycles using different heating rates were carried out at 1050-1550 degrees C with dwell times of 3 min and 20 min under uniaxial pressure of 80 MPa. Alumina sintered at 1550 degrees C for 20 min reached 99% of the theoretical density and average grain size of 8.5 mu m. Significant grain growth was observed in ceramics sintered at temperatures above 1250 degrees C.

• 出版日期2016-8-1