Abstract
The microstructure of polymer-derived Si-based ceramic materials was characterised with elemental distribution images produced by electron spectroscopic imaging. Depending on the processing conditions, a variety of different microstructures were obtained from the same precursor: without sintering additives, amorphous silicon carbonitride which is stable against crystallisation up to 1400 °C is formed. In the presence of Al 2O 3 and Y 2O 3 as sintering additives, Si 3N 4/SiC-composite materials and Si 2N 2O ceramics are produced. Sintering a mixture of Si 3N 4 powder with additional polysilane leads to a Si 3N 4/SiC-composite comprising nano-sized SiC inclusions in the Si 3N 4 grains. The development of the microstructure of the Si 3N 4/SiC composite materials was investigated as a function of the sintering temperature and of the concentration of the sintering additives. The observed microstructural changes lead to conclusions on the processes which occur during the sintering of the materials.
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