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作者系统研究了硅溶胶强化对陶芯显微结构及性能的影响,结果表明加入硅溶胶I能降低反玻璃化温度,加速方石英析晶,抑制石英玻璃的粘性流动,因而使试样的高温挠度明显减小.由于强化了陶芯基体,使高温强度提高,孔隙率减低.经强化的复杂陶芯具有异常的高温稳定性,在定向凝固过程中当温度为1500~1550℃、保持时间为1小时或稍多,陶芯无明显变形.在定向凝固生产具有复杂内腔的空心叶片中应用这类陶芯是可行的.
The authors systematically studied the effect of silica sol on the microstructure and properties of ceramic core. The results show that the addition of silica sol I can reduce the devitrification temperature, accelerate the crystallization of cristobalite, and inhibit the viscous flow of quartz glass, so the high temperature deflection of the sample is obvious Reduced due to strengthening the ceramic core matrix, so that high-temperature strength, porosity decreased.Enhanced complex ceramic core with abnormal high temperature stability in the directional solidification process at a temperature of 1500 ~ 1550 ℃, the holding time of 1 hour Or slightly more, without significant deformation of the ceramic core.It is feasible to apply such ceramic cores in the directional solidification of hollow blades with complex internal cavities.