PRESSURE FILTRATION OF SILICON-NITRIDE SUSPENSIONS WITH CONSTANT FILTRATION-RATE
PRESSURE FILTRATION OF SILICON-NITRIDE SUSPENSIONS WITH CONSTANT FILTRATION-RATE
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DOI：
10.1016/0921-5093(92)90213-k
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发表时间：
1992-05-01
期刊：
影响因子：
6.4
通讯作者：
KULIG, M
中科院分区：
文献类型：
--
作者：
GREIL, P;GRUBER, U;KULIG, M
用预氧化和静电稳定的粉末混合物制备了固体体积分数为0.2 ~ 0.5的氮化硅水相悬浮液。研究了在最大压力为10 MPa的恒定过滤速率下，多孔钢模具内的过滤动力学。由于过滤速率恒定，颗粒进入生长中的滤饼表面的水动力条件与滤饼厚度无关。因此，获得分数密度为0.6的无梯度绿色压块，可通过等静压进一步致密化至0.74。对于含有高达20%体积%的SiC薄片的复合材料，也可以获得比冷等静压样品更高的基质密度。
Aqueous silicon nitride suspensions with solid volume fractions of 0.2-0.5 were prepared from preoxidized and electrosterically stabilized powder mixtures. The filtration kinetics during pressure casting with constant filtration rate up to a maximum pressure of 10 MPa into porous steel molds were examined. Resulting from the constant filtration rate the hydrodynamic conditions for particle incorporation in the growing cake surface remain independent of the cake thickness. Thus, gradient-free green compacts with a fractional density of 0.6 were obtained which could be further densified by isostatic compression up to 0.74. Significantly higher matrix densities than for cold isostatically pressed samples could also be obtained for composite materials containing up to 20 vol.% of SiC platelets.