INCREASED MECHANICAL STRENGTH OF La_(0.8)Ca_(0.2)CrO_3 BY IMPROVEMENT OF POWDER PROPERTIES AND SINTERING CONDITIONS

摘要

By removing coarse agglomerates in La_(0.8)Ca_(0.2)CrO_3 powder with Y_2O_3 as additive (Pyrox, France), we have been able to improve the mechanical strength of the sintered interconnect material at room temperature by 62 % (i.e. the four-point bend strength increased from 76 to 123 MPa). The four-point bend strength at 1000℃ for the improved powder showed an increase, according to the present measurements, that was proportional to the increase in the room temperature values (from 57 to 91 MPa). Creep measurements have demonstrated that this material has a considerable creep rate at 1000℃. The effect of different sintering conditions on microstructure are also discussed.