论文信息 - Effects of Vacuum Heat Treatment of Nano Powder on Sintering of Transparent Nano-Crystalline MgAl2O4 Ceramics

Effects of Vacuum Heat Treatment of Nano Powder on Sintering of Transparent Nano-Crystalline MgAl2O4 Ceramics

Nano-sized MgAl2O4 powders were treated at 500~1000 oC in a vacuum of 10-3Pa for 2 h, and then sintered at 500~900 oC under 1~6 GPa. The powders with and without vacuum-heat-treatment were investigated by means of Transmission Electron Microscope (TEM) and Sedimentation Test. It was found that the vacuum-heat-treatment of nano powder could effectively get rid of the absorbed gas on the surface of nano-particles. Bulk nanostructured transparent ceramics without cracks were sintered easily with the treated nano-sized powder. The success rate of nano-sinterning of bulk transparent ceramics was greatly increased when a suitable vacuum-heat-treatment process was used for the starting nano-sized powder.

[1] E. Kemnitz,et al. Transparent ceramics from sol–gel derived elpasolites by cold pressing , 2007 .

[2] D. He,et al. Effect of precompression on pressure-transmitting efficiency of pyrophyllite gaskets , 2007 .

[3] S. Gierlotka,et al. Method of preparation and structural properties of transparent YAG nanoceramics , 2007 .

[4] K. Sun,et al. Low-temperature high-pressure preparation of transparent nanocrystalline MgAl2O4 ceramics , 2006 .

[5] T. Nishimura,et al. New strategies for preparing nanosized silicon nitride ceramics , 2005 .

[6] H. Fjellvåg,et al. Nanocrystalline Orthoferrite GdFeO3 from a Novel Heterobimetallic Precursor , 2002 .

[7] L. Gauckler,et al. Sintering of Nanocrystalline CeO2 Ceramics , 2001 .

[8] Ya-li Li,et al. Sintering of nanopowders of amorphous silicon nitride under ultrahigh pressure , 2000 .

[9] I. Chen,et al. Sintering dense nanocrystalline ceramics without final-stage grain growth , 2000, Nature.

[10] Y. Waseda,et al. Nanocrystalline MgAl2O4: Measurement of Thermodynamic Properties Using a Solid State Cell , 2000 .

[11] B. Kear,et al. High pressure/low temperature sintering of nanocrystalline alumina , 1998 .

[12] K. Pae,et al. Theory of high pressure/low temperature sintering of bulk nanocrystalline TiO2 , 1997 .

[13] A. Heuer,et al. Alcohol Interaction with Zirconia Powders , 1990 .