Mixing and Characterisation of stainless steel 316L feedstock

Kong, Xiangxing; Quinard, Cédric; Barrière, Thierry; Gelin, Jean‐Claude

doi:10.1007/s12289-009-0652-0

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…Thus, water-soluble based binder such as Polyethelena Glycol (PEG) is arising as an environmentally favored solvent. The design of feedstock formulations depends on numerous factors, such as mixture fluidity, feedstock homogeneity, adequacy of the debinding process and debinding time [4].…”

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confidence: 99%

Rheological Analysis of Microminiature Powder Injection Molding (μPIM) Feedstock

Muhamad²

2011

AMM

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A rheological analysis has been performed to evaluate the characteristics and behaviors of Microminiature Powder Injection Molding (μPIM) feedstocks. The feedstocks comprised of 316L stainless steel powder and water-based binder components. Feedstocks formulations with powder loading of 59% to 63% were prepared and investigated. In these formulations, the binder system consists of 65% Polyethelena Glycol (PEG), 25% Polymethyl Methacrilate (PMMA) and 10% Cellulose Acetate Butyrate (CAB) based on the weight fraction. The influences of rheological behaviors such as flow activation energy (E), Power-Law exponent (n), viscosity (η) and temperature (T) of the SS316L/PEG/PMMA/CAB feedstocks are analyzed and discussed. Results show that all of the feedstocks exhibited the pseudo-plastic flow behavior. The homogenous feedstock at 61 vol. % demonstrated the most satisfactory rheological properties for μPIM with the lowest flow activation energy, Power-Law exponent, n < 1 and moderate viscosity values. It was chosen to perform the injection molding process. Micro components have been replicated successfully by using this selected feedstock.

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confidence: 99%

Rheological Analysis of Microminiature Powder Injection Molding (μPIM) Feedstock

Muhamad²

2011

AMM

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“…The torque values are obtained by a gradual powder addition procedure during mixing (Figure 2a) and are plotted against powder concentrations ( Figure 2b). The CPVC is the volume for which the torque increases suddenly (for example, the value marked with the star in Figure 2b) [41][42][43]. In respect to the application of capillary rheometer, the flow activation energies are plotted against powder concentrations [44,45].…”

Section: Semicrystallinementioning

confidence: 99%

“…The CPVC is the one corresponding to the feedstock with less activation energy, which means lower viscosity sensitivity to temperature variations and, thus, a higher possibility of manufacturing defect-free parts. The capillary rheometry technique can involve the evaluation of other rheological properties, such as shear viscosity and shear rate [42,46,47].…”

Section: Semicrystallinementioning

confidence: 99%

“…This last technique shows that a well-prepared feedstock must have powders covered with a thin layer of binder (as illustrated in Figure 3) [51]. In the torque graph approach, it is assumed that the homogeneity of the feedstock is achieved when the torque variations reach a steady state, which is affected by the composition of the binder used [42,52], the speed and time of mixing and the powder concentration [23,51,53]. Homogeneity can also be evaluated by checking if the measured density of a feedstock sample is analogous to its theoretical density.…”

Section: Semicrystallinementioning

confidence: 99%

“…In studies where powder hot embossing was analyzed, it was reported that replicability (shape retention and surface roughness) is affected by critical embossing parameters: pressure The values of CPVC and PL are influenced by several factors, like the composition of binder [26,42,48], the PSD and the powder morphology [17,31,49,50]. Some authors have indicated that CPVC decreases with the decrease of PSD (due to the viscosity increase) and that it increases with the increase in sphericity of metallic particles [31].…”

Section: Hot Embossingmentioning

confidence: 99%

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Development of Metal Powder Hot Embossing: A New Method for Micromanufacturing

Sequeiros

Emadinia

Vieira

et al. 2020

Metals

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Hot embossing is a small-scale, low-cost processing technology that can deliver products to the market in a short time. This microreplication technology is well established to produce polymeric components and has applications in several industrial sectors. The use of micropowder hot embossing in the production of metal components is an emerging and challenging process that, when compared to other typical technologies, brings some economic advantages in a volatile market with an increasing tendency to manufacture customized products. The main objective of this review is to analyze the potential of powder hot embossing and its developments in the production of metallic microparts/components. This technology requires four distinct steps: (1) production feedstock (preparation of mixtures), (2) hot embossing (shape forming), (3) debinding and (4) sintering. These steps are interrelated and influence the characteristics of the final metallic microparts. This study summarizes the approaches implemented for the use of different metallic powders and polymeric binder systems for the preparation of the feedstock, the mold materials and the critical conditions tested in the embossing step to produce green parts, and the production of the final parts through the application of debinding and sintering. Powder hot embossing is a viable replication technology that allows the production of new metallic microcomponents, contributing to the global scientific effort of miniaturizing manufacturing process, equipment and products. The merit of powder hot embossing for industrialization needs further development to assert itself in the market and compete with other micromanufacturing techniques.

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