Aqueous tape casting and mechanical properties of La2NiO4+delta dense membranes

作者：Chen Xinzhi; Einarsrud Mari Ann; Grande Tor^*

来源：Journal of the European Ceramic Society, 2015, 35(1): 309-315.

DOI：10.1016/j.jeurceramsoc.2014.07.033

• La2NiO4+delta
• Ceramic membranes
• Tape casting
• Mechanical properties

An environmentally friendly aqueous tape casting process for the fabrication of La2NiO4+delta membranes was developed using fine powders synthesized by spray pyrolysis. Green tapes with a thickness of 30-300 mu m were obtained and dense and homogeneous membranes were prepared by lamination of green tapes followed by sintering in the temperature range 1300-1420 degrees C. The bi-axial fracture strength of the sintered materials increased from similar to 108 to similar to 155 MPa decreasing the average grain size of the membranes from about 9.6 to 4.2 mu m. The hardness and fracture toughness, measured by the Vickers indentation technique, also decreased with increasing grain size. The mechanical properties of La2NiO4+delta ceramics are discussed with focus on micro-cracking/residual stresses due to the strong crystallographic anisotropy of La2NiO4+delta.

• 出版日期2015-1