Direct observation of mould cavity filling in ceramic injection moulding

Dvořák, Pavel; Barrière, Thierry; Gelin, Jean‐Claude

doi:10.1016/j.jeurceramsoc.2008.02.001

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…As ar esult, it was verified that decreasing the injection velocity can eliminate the jetting and porosity in line with the results of the similarly conducted studies [4,6,7]. However, the givencondition deterioratedthe surface quality of components due to rapid solidification of the molten feedstock.…”

Section: Resultssupporting

confidence: 78%

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

Safarian

Karataş

2015

International Journal of Materials Research

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The initial stage of shaping ac omponent in metal injection molding is the injection process. Any defects occurring in this stage are transferred to the subsequent stages, namely debinding and sintering. To investigate the jetting phenomenon in the current study, 316L stainless steel feedstock was exploited as the material for fabricating thick cylindrical specimens with ad iameter of 20 mm. Regarding the aforementioned thick specimens, injection at the normal velocity of 15 cm 3 s -1 resulted in critical defects, such as folding, weld lines and porosity. It was found that these defects were eliminated in the specimens injected at velocities as low as 1cm 3 s -1 .U nder such conditions, however, due to the increase in the injection time, the flow front rapidly solidifies with ensuing dramatic deterioration of component surface quality. Furthermore, the present study proposes an ovel method, entitled inserted metal injection molding, with a double aim both for removing the jetting phenomenon and the consequent defects in injected components and for making the injection process possible at normal velocities allowing fabrication of the components with high surface quality.A. Safarian, Ç. Karataş: The impact of injection velocity on the defects in thick components fabricated by IMIM Int. J. Mater. Res.( formerly Z. Metallkd.) 106 (2015) 66 49 Fig. 3. Sintered specimens and microscopic views of their surfaces injected at 1cm 3 s -1 (left) resulting in low surface quality, and injected at 15 cm 3 s -1 (right) resulting in high surface quality.

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Section: Resultssupporting

confidence: 78%

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

Safarian

Karataş

2015

International Journal of Materials Research

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“…Therefore, the coordination of the feedstock, mold, and injection parameters is the key to eliminate defects from welding lines. Welding lines on the green body surface likely indicate inadequate inner welding in the green body, which can result in the development of inner cracks [22].…”

Section: Analysis Of Defect Evolutionmentioning

confidence: 99%

Injection molding of ultra-fine Si3N4 powder for gas-pressure sintering

Yang

et al. 2015

Int J Miner Metall Mater

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The ceramic injection molding technique was used in the gas-pressure sintering of ultra-fine Si 3 N 4 powder. The feedstock's flowability, debinding rate, defect evolution, and microstructural evolution during production were explored. The results show that the solid volume loading of less than 50vol% and the surfactant mass fraction of 6wt% result in a perfect flowability of feedstock; this feedstock is suitable for injection molding. When the debinding time is 8 h at 40°C, approximately 50% of the wax can be solvent debinded. Defects detected during the preparation are traced to improper injection parameters, mold design, debinding parameters, residual stress, or inhomogeneous composition distribution in the green body. The bulk density, Vickers hardness, and fracture toughness of the gas-pressure-sintered Si 3 N 4 ceramic reach 3.2 g/cm 3 , 16.5 GPa, and 7.2 MPa·m 1/2 , respectively.

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“…The Lagrangian-Eulerian approach was also developed to simulate jetting defects. These defects generate welding lines in the final component after sintering [10]. Thermal and/or solvent debinding simulations have been developed for copper and stainless steel powders to predict binder degradation, associated deformation and stress [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and numerical simulation analysis of sintered micro-fluidic devices

2019

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This study investigates the use of numerical simulations to describe the solid-state diffusion of a sintering stage during a metal injection moulding process for micro-fluidic components with 316L stainless steel powders. Finite element (FE) analysis based on a thermo-elastoviscoplastic model was conducted to describe the densification process of a stainless steel porous component during solid-state sintering. The numerical analyses, which were performed on a 3D micro-structured component with various powder volume loadings to take into account the thermal debinding effect to propose a full debinding sintering simulation, demonstrated that the FE simulation results are in agreement with the experimental ones.

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Direct observation of mould cavity filling in ceramic injection moulding

Cited by 16 publications

References 13 publications

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

Injection molding of ultra-fine Si3N4 powder for gas-pressure sintering

Experimental investigation and numerical simulation analysis of sintered micro-fluidic devices

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