Study On The Microstructure And Properties Of The Nano Mineralizer Enhancement Of Silica-Based Ceramic Cores

The performance of the ceramic cores directly restricts the rapid development of the hollow aeroengine blade cooling technology. This paper regards the hollow aeroengine blades with ceramic cores as the research object, by adding the nano composite mineralizer, Through the research of effects of the core substrate material species and amount of nano mineralizer and sintering temperature on the microstructure and mechanical properties of silica ceramic cores, optimize the silicon core mineralizer formula and its preparation process in order to obtain ideal core structure and improve the comprehensive performance of the ceramic cores. Through exploring the core material composition and mineralization agent of silica-based ceramic core mechanism, it provides theoretical reference to further improve the performance of silica-based ceramic core.In this paper, by testing the mechanical properties of silica-based ceramic core and the use of SEM, XRD to silicon core microstructure analysis, the following main conclusions:(1)Burning temperature has a significant effect on core microstructure.To add 6% of nano zirconia core, burning temperature is 1250℃, the microstructure of angular particles, and there are small particles filled in the surrounding, and between particles is not quite close together, sintering inadequate;Burning temperature is 1300 ℃, the particle size distribution is relatively uniform, edges and passivation, and heap to squeeze more dense, obvious effect of the liquid phase sintering. Burning temperature is 1350 ℃, quartz glass particles significantly passivates, liquid phase increases significantly.(2)The nano zirconia core and nano silica core, its bending strength at room temperature with the increase of sintering temperature increase at first and then decreases gradually, peaked at 1300℃, 28.59 MPa, 25.15 MPa, respectively, than those not Ghana m mineralizer strength increased by 1.4 to 1.4 times, respectively, to join the core temperature deflection of nano zirconia was 34% lower, but the shrinkage rate increased by 52%, volume density increased by 24%; Add zircon powder core of mineralizer at room temperature at 1350℃ maximum intensity, 9.905 MPa, and did not add mineralization dosage form core strength(10.69MPa).(3)Adding carbon nanotubes to a certain extent, improves the bending strength of core, but reduces the core ability of resistance to high temperature creep.