PREDICTION OF SINTERED DENSITY FOR BIMODAL POWDER MIXTURES
PREDICTION OF SINTERED DENSITY FOR BIMODAL POWDER MIXTURES
复制标题
DOI：
10.1007/bf02647329
复制
发表时间：
1992-05-01
期刊：
影响因子：
--
通讯作者：
GERMAN, RM
中科院分区：
文献类型：
--
作者：
GERMAN, RM
双峰混合物可提高粉末系统的生坯密度，并用于注浆成型和粉末注射成型等工艺。堆积密度可以以合理的精度预测，但双峰混合物的烧结密度存在很大的不确定性。使用比体积来处理大/小成分对堆积密度和烧结密度的影响。对于给定的成分，当已知四个参数时，可以准确预测堆积密度：粒度比、小粉末的堆积密度、大粉末的堆积密度和混合物均匀性。根据大粉末和小粉末的致密化以及混合物均匀性的知识可以预测烧结密度。该模型适用于钼、不锈钢、铁和氧化铝的双峰混合物。双峰混合物的成分粉末必须满足某些标准才能表现出最高的烧结密度。在许多情况下，最高的烧结密度出现在 100% 的小粉末成分处。
Bimodal mixtures improve the green density of powder systems and are used in processes such as slip casting and powder injection molding. The packing density can be predicted with reasonable accuracy, but there is great uncertainty in the sintered density of a bimodal mixture. The large/small composition effect on packing density and sintered density is treated using the specific volume. For a given composition, the packing density is accurately predicted when four parameters are known: particle size ratio, packing density of the small powder, packing density of the large powder, and mixture homogeneity. Prediction of the sintered density is possible from knowledge of the densification of the large and small powders and mixture homogeneity. The model is applied to bimodal mixtures of molybdenum, stainless steel, iron, and alumina. Certain criteria must be satisfied by the constituent powders for a bimodal mixture to exhibit the highest sintered density. In many situations, the highest sintered density occurs at the 100 pct small powder composition.