Fabrication of titanium components by low-pressure powder injection moulding using hydride-dehydride titanium powder

Moghadam, Masoud Shahidi; Fayyaz, Abdolali; Ardestani, Mohammad

doi:10.1016/j.powtec.2020.08.075

Cited by 23 publications

(20 citation statements)

References 24 publications

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“…Based on Table 1 , the mixing temperature exceeded the melting temperature but was lower than the binder decomposition temperatures. Temperature control helped prevent binder degradation during mixing [ 23 ]. A DSM Xplore table-top injection molding machine (Xplore Instruments BV, Sittard, The Netherlands) was employed to process the 17-4PH and zirconia feedstocks to fabricate defect-free green micro-sized bi-material components using a sequential mechanism.…”

Section: Methodsmentioning

confidence: 99%

Sintering Behavior of Bi-Material Micro-Component of 17-4PH Stainless Steel and Yttria-Stabilized Zirconia Produced by Two-Component Micro-Powder Injection Molding Process

et al. 2022

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In this research, we investigated the influence of the sintering temperature on the physical and mechanical properties of micro-sized bi-material components of 17-4PH stainless steel and 3 mol% yttria-stabilized zirconia fabricated using a two-component micro-powder injection molding (2C-μPIM) process. First, 17-4PH and zirconia powders were separately mixed with binders to obtain feedstocks, which were then injection-molded into the dumbbell shape, followed by the binder extraction process. Subsequently, the debound micro-specimens were subjected to sintering between 1250 °C and 1350 °C for 3 h. Per the observations of the microstructures using scanning electron microscopy (SEM), a strong bond between metal and ceramic in micro-sized 17-4PH/zirconia components was formed when the sintering temperature exceeded 1300 °C. The maximum relative density of 99% was achieved when the bi-material micro-part was sintered at 1350 °C. The linear shrinkage increased from 9.6% to 17.4% when the sintering temperature was increased from 1250 °C to 1350 °C. The highest hardness value of 1439.6 HV was achieved at 1350 °C along the bi-material bonding region. Moreover, a maximum tensile strength of 13.7 MPa was obtained at 1350 °C.

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Section: Methodsmentioning

confidence: 99%

Sintering Behavior of Bi-Material Micro-Component of 17-4PH Stainless Steel and Yttria-Stabilized Zirconia Produced by Two-Component Micro-Powder Injection Molding Process

et al. 2022

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“…As seen in Figure 2, in die cavity filling, the inability of non-spherical powder particles to rotate on one other inhibits their mobility. This causes non-spherical powder particles to have a greater viscosity than spherical powder particles [74]. Hidalgo et al [75] verified that using spherical and small ceramic powders translates to better injection and sintering.…”

Section: Powdermentioning

confidence: 99%

“…In the case of using non-wax polymers as the backbones in LPIM feedstocks, polyolefins such as low viscosity grades of PP, PE, and EVA are usually used. When it comes to using polyolefins as the backbone, although some researchers have used high percentages of polymers successfully [33,74,79], it is recommended to have less than 10 vol.% polymers in the binder system for LPIM to keep the viscosity low.…”

Section: Binder Systemmentioning

confidence: 99%

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Research Progress on Low-Pressure Powder Injection Molding

et al. 2022

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Powder injection molding (PIM) is a well-known technique to manufacture net-shaped, complicated, macro or micro parts employing a wide range of materials and alloys. Depending on the pressure applied to inject the feedstock, this process can be separated into low-pressure (LPIM) and high-pressure (HPIM) injection molding. Although the LPIM and HPIM processes are theoretically similar, all steps have substantial differences, particularly feedstock preparation, injection, and debinding. After decades of focusing on HPIM, low-viscosity feedstocks with improved flowability have recently been produced utilizing low-molecular-weight polymers for LPIM. It has been proven that LPIM can be used for making parts in low quantities or mass production. Compared to HPIM, which could only be used for the mass production of metallic and ceramic components, LPIM can give an outstanding opportunity to cover applications in low or large batch production rates. Due to the use of low-cost equipment, LPIM also provides several economic benefits. However, establishing an optimal binder system for all powders that should be injected at extremely low pressures (below 1 MPa) is challenging. Therefore, various defects may occur throughout the mixing, injection, debinding, and sintering stages. Since all steps in the process are interrelated, it is important to have a general picture of the whole process which needs a scientific overview. This paper reviews the potential of LPIM and the characteristics of all steps. A complete academic and research background survey on the applications, challenges, and prospects has been indicated. It can be concluded that although many challenges of LPIM have been solved, it could be a proper solution to use this process and materials in developing new applications for technologies such as additive manufacturing and processing of sensitive alloys.

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“…TiH 2 is commonly used to produce Ti products with acceptable performance via the hydrogenation-dehydrogenation (HDH) process [ 58 ]. Ti powders react with a high concentration of hydrogen at high temperatures to produce TiH 2 : Ti(s) + H 2 → TiH 2 (s) [ 59 ].…”

Section: Dehydrogenation Processmentioning

confidence: 99%

Influence of processing parameters on dehydrogenation of TiH2 in the preparation of Ti–Nb: A review

Sa'aidi

Farrahnoor

Hussain

2022

Heliyon

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Fabrication of titanium components by low-pressure powder injection moulding using hydride-dehydride titanium powder

Cited by 23 publications

References 24 publications

Sintering Behavior of Bi-Material Micro-Component of 17-4PH Stainless Steel and Yttria-Stabilized Zirconia Produced by Two-Component Micro-Powder Injection Molding Process

Sintering Behavior of Bi-Material Micro-Component of 17-4PH Stainless Steel and Yttria-Stabilized Zirconia Produced by Two-Component Micro-Powder Injection Molding Process

Research Progress on Low-Pressure Powder Injection Molding

Influence of processing parameters on dehydrogenation of TiH2 in the preparation of Ti–Nb: A review

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