Square Root Wick Debinding Model for Powder Injection Moulding

Partial wick-debinding of low-pressure powder injection-moulded ceramic parts

“…7 Furthermore, the debinding rate did not correspond well to some experiments. 4 It has also been observed that the permeability in a wick embedment can have important effects and can be a limiting factor, rather than the flow through a sample, as was suggested in German's model. 4,7 With more precise examinations of the binder removal rate it has been confirmed that wick-debinding must take place via more than a single mechanism.…”

“…[2][3][4][5][6][7] Some of it was based on experiments using HPIM. 3,4 However, they are quite general and can also be applied for the LPIM system. Theoretical work based on experiments using a single-component binder, which is characteristic for LPIM, has also been conducted.…”

Overview of powder injection molding

“…Compared with thermal debinding wick debinding saves time and allows better shape retention, since the molded parts are supported all over. To guarantee the wicking effect it is necessary that the wick powder has a mean particle size at least ten times smaller than that of the green part [30]. For metal powders this is relatively easy, but for the finer ceramic powders (av.…”

2-D simulation of wick debinding for ceramic parts in close proximity

“…This analysis was reported to agree with the experimental results of Waikar and Patterson (1986). Vetter et al (1994) subsequently reported that German's model did not provide good agreement with experimental results and suggested an alternative binder removal mechanism that considered the binder leaving the part via distinct binder-rich and binder-lean zones. However, the experimental results reported by Bao and Evans (1991) and by Kim et al (1996) showed the binder to be distributed uniformly through the part, in contrast to both the above descriptions.…”