Si3N4 Composite Piston Cap for Adiabatic Engine
Si3N4 composite piston cap is made of Si3N4 matrix adding Y2O3, TiC and A12O3. The microstructure of Si3N4 composite shows α —Si3N4 and whisker-like β —Si3N4 grains homogeneously distribute in the matrix. The second phase particles are spread in the α —Si3N4 grains. The reinforced mechanism of two phases is discussed. The Si3N4 composite piston cap has been worked for over 100 hrs at over 800 °C for 1500 r/min during the high or full power run without water cooling. Experimental results show two phases microstructure gives the high mechanical properties which can make the resistance to thermal shock and high temperature.
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