抄録
A spodumene ceramics doped with 23.1-mass% Si3N4exhibited an averaged thermal-expansion-coefficient of -0.032 x 10-6K-1 between 293K and 300K. The effect of the Si3N4 quantity on the microstructure of the ceramics was characterized by using a transmission electron microscope (TEM) equipped with energy-dispersive spectroscopy (EDS). Below 11.1-mass % Si3N4, a spodumene-Si3N4 complex formed as a dense material in the porous spodumene ceramics, like islands. A part of Si3N4 dissolved in the spodumene causing a glassy type of spodumene to form around the Si3N4. With increasing Si3N4 content, the dense material region extended homogeneously throughout the ceramics. Above 33.1-mass% Si3N4, a poreless complex was produced.
