Study on Gel Casting of 316L Stainless Steel Powder through Mold DIS Process
Purpose The purpose of this paper was to study the gel casting of metal powder by agar gelation through Mold DIS process: verifying the feasibility and improving the processing parameters to prepare stable metal slurry and strong green body.Design/methodology/approach The optimal processing parameters have been achieved after investigating the effects of this parameters, such as temperature, agar content, dispersant concentration,solid volume loading, etc. The rheologic behavior of metal slurry and the character of formed green body have also been investigated. The mixture and dispersion mechanism of metal slurry, the consolidation forming and sintering technology of green body have been preliminary studied based on analysis of experimental results.Findings The results showed that the optimal pH range was 8.5~9.5 while the grain size distribution of 2~30 μm and the suspension with 55% solids, which could be prepared by adding proper dispersant (Polyvinyl Alcohol). The agar and dispersant content had great effect on the properties of slurry:when 1.0wt.% dispersant and 0.7wt.% agar content (referred to dry solid) was adopted, stable metal slurry with viscosity less than 1 pa·s and green body with bending strength of 2.7 Mpa was obtained. The sintered bodies with uniform structure, relative density of 90% and yield strength of 150 Mpa, have been prepared at 1300 ℃/30min in vacuum.Practical implications This process could be applied to rapid prototyping of complex shape metal products, for example rotor blades.Originality/value The paper dealt with experimental works by innovative techniques. In particular,before this paper, the investigation on the character of metal slurry and green body, the determination of processing parameters of gel casing of metal powder by agar gelation were very lacking.
Rapid prototyping Mold DIS 316L stainless steel Agar Gel casting
Fei Wang Kai-Yong Jiang Xi-Peng Xu
College of Mechanical Engineering and Automation, Huaqiao University, Quanzhou, China
国际会议
北京
英文
502-509
2008-11-06（万方平台首次上网日期，不代表论文的发表时间）