摘要:
将凝胶离心成型工艺应用于316L-TiC复合粉末的坯体成型, 研究了固含量对316L-TiC复合粉末浆料流变性的影响以及引发剂的加入量对粉末浆料固化时间的影响, 分析了凝胶离心成型工艺中离心转速与316L-TiC坯体的密度和强度的关系。结果表明: 以油酸作分散剂, 制备稳定且流动性好的浆料的最佳固含量为55%(体积分数); 引发剂的加入量为0.7%(占预混液的质量分数), 采用自行设计的离心成型机, 选择最佳转速3000 r/min, 制备出的坯体密度高、无残留气孔, 相对密度64.3%, 强度26.3 MPa。坯体经真空脱胶1380℃烧结保温1 h 制备出316L-TiC合金管, 烧结体收缩均匀无变形, TiC颗粒呈均匀分布。
Abstract:
Centrifugal gel forming was applied to the molding of 316L-TiC composite powders. The effect of the solids loading on the rheological behavior of 316L-TiC composite powders slurry was investigated, and the effect of the amount of initiator on the solidification time was also studied.Moreover, the relationship between the rotation speed and the density and strength of green body by centrifugal gel forming was analyzed. The results show that, using oleic acid as dispersion, slurry with good flowability and good stability has been prepared, at which a maximum solids volume fraction of 55% and the amount of initiator of 0.7%(mass fraction in the premix) can be obtained. Using the device made by ourselves and choosing the optimum rotation speed 3000 r/min, the green body with high density and no residue stomatal has been prepared, while the relative density and strength is 64.3% and 26.3 MPa, respectively. 316L-TiC alloy pipe is achieved by sintered at 1380℃ for 1 h in vacuum, which has a uniform shrinkage without deformation and the homogeneous distribution of the TiC particles.
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