This work addresses the two great challenges of spark plasma sintering (SPS) process: The complex shapes and simultaneous production multiple parts. A new controllable interface method is employed to concurrently consolidate nickel gear by SPS. graphite deformable sub-mold specifically designed for mutual densification both parts in a unique 40 mm powder deformation space. An energy efficient SPS configuration developed allow large-scale assembly under electric current lower than 900 A....

Metal matrix composites (MMCs) are lightweight, high-performance materials with continuous expansion in industrial applications. In this study, Laser Powder Bed Fusion (LPBF), Binder Jetting (BJ), and Spark Plasma Sintering (SPS), were used to produce AISI 316L austenitic stainless steel (SS316L)-WC composite different compositions powder preparations. the present products manufactured these technologies material compared terms of final density, microstructure, mechanical property. Results...

A novel routine is developed to produce nanostructured ceramic-based composites with enhanced mechanical properties and tailored magnetic behavior.

Despite many efforts, the outcomes obtained with field-assisted processing of materials still rely on long-term coupling other electroless processes. This conceals efficacy and intrinsic contributions electric current. A new device utilizing electrical nano pulsing (ENP) has been designed constructed to bring quasi-instantaneous modifications micro- nano-structure in materials. Featuring ultra-high intensity (~ 1011 A/m2) ultra-short duration (< 1 μs), ENP technology activates...

Using theory and simulations, the challenge of gravity-induced distortions during sintering is addressed a mitigation strategy proposed. Based on continuum sintering, finite element simulation demonstrates advantages rotating furnace to counteract gravity forces sintering. Its application for stainless steel hollow parts produced by additive manufacturing (binder jetting) demonstrated, numerically, reliable industrial production complex shapes. Sintering tube in very slow motion exhibits an...

Boron carbide (B4C), known for its unique properties, presents challenges in reaching full density with sintering process due to low diffusion coefficients. This study explores the application of Spark Plasma Sintering (SPS) overcome these and enhance understanding impact on pure B4C ceramics. The outlines a comprehensive methodology developing an SPS model. Starting summary conducted studies, powder oxidation analysis, characterization methods, dilatometry curves processing, article details...

A novel method of producing complex ceramic and metallic parts with designed internal channels is developed. The utilizes a combination the additive manufacturing technique solvent jetting spark plasma sintering (SPS.) developed approach brings benefits in shapes channels. Along geometric customization 3D printed mold, major advantage this removal need for long debinding process, usually necessary other printing methods, by using SPS. High density were successfully produced close to...

In this paper, we explore the effect of a long solidification time (12 h) on mechanical properties an EN-GJS-400-type ferritic ductile cast iron (DCI). For purpose, static tensile, rotating bending fatigue, fatigue crack growth and fracture toughness tests are carried out specimens extracted from same casting. The obtained results compared with those similar materials published in technical literature. Moreover, discussion is complemented metallurgical fractographic analyses. It has been...

Spark plasma sintering (SPS) is one of the most promising technologies for producing polycrystalline transparent ceramics. However, it has limitations regarding complexity geometries that can be produced. This study addresses these by combining additive manufacturing techniques with spark sintering. Additionally, a Multiphysics model based on continuum theory employed to predict outcomes SPS process, particularly microstructure densified parts. As result, geometrically complex Al2O3 parts...

This work proposes a hypothesis for the interpretation of shrinkage anisotropy during sintering an Fe–Cu–C alloy based on effect structural modifications powder, due to prior compaction, mass transport phenomena. Dislocations are introduced by cold compaction in contact regions between particles, with different densities along direction and transversal one. Therefore, volume diffusion is strongly activated both directions, prevailing shown. The coefficients derived from kinetic model...

Spark Plasma Sintering (SPS) is used to fabricate Titanium-Niobium-Zirconium-Tantalum alloy (TNZT) powder-based bioimplant components with controllable porosity. The developed densification maps show the effects of final SPS temperature, pressure, holding time, and initial particle size on sample relative density. Correlations between density mechanical properties fabricated TNZT are also investigated microstructural analysis processed material conducted. A model proposed calculate creep...

The influence of the microstructure uniaxial cold-compacted green iron on sintering shrinkage was investigated. Pores in parts are very slightly oriented, while dimension interparticle contact areas is anisotropic. A large and anisotropic anisothermal alpha measured, greater than isothermal at 1120°C. results were interpreted basis geometrical structural activity, effective diffusivity responsible for neck growth determined.

Abstract High heating rates ranging from 50 to 250°C/min are selected rapidly sinter transparent aluminum oxynitride (Al ON ) ceramics by spark plasma sintering ( SPS at 1600°C under 60 MPa using a bimodal Al powder synthesized the carbothermal reduction and nitridation method. With 1 minute holding time before cooling, all specimens show high density transparence. The maximum transmittance is up 74.5%‐80.6%, where positively correlated with rate. Further analysis reveals that faster enable...

Abstract Present technologies of additive manufacturing (such as binder‐jetting, stereolithography, robocasting, etc.) complex‐shape powder‐components necessitate fine‐tuning sintering applied to highly porous 3D‐printing products. The densification low‐density, complex shapes requires control the gravity‐related phenomena ensure a nearly full and distortion‐free densification. present study addresses these issues through involvement comprehensive finite element simulations, determination...

Tungsten carbide (WC), renowned for its exceptional hardness and wear resistance, plays an essential role in various industrial applications (cutting tools, abrasives, wear-resistant components). While traditional methods involve hot pressing, Spark Plasma Sintering (SPS) combined with Additive Manufacturing (AM) offers a cutting-edge approach, utilizing high-voltage electric current mechanical pressure rapid densification, particularly advantageous fabrication of complex shape components...

The influence of the Peltier thermoelectric effect on evolution temperature, density, and grain size heterogeneities during spark plasma sintering (SPS) boron carbide is numerically evaluated. An electro-thermo-mechanical model SPS process, which takes into account effects, developed incorporated in a finite element code. A growth law integrated numerical model. predictions are verified via comparison with microstructure data experimentally obtained by high resolution scanning electron...

The anisotropy of dimensional change on the sintering iron was investigated by dilatometry. Dimensional changes are different along longitudinal and transversal directions, shrinkage is more pronounced parallel to compaction direction. This phenomenon particularly during early stage sintering, in alpha field below Curie temperature. results were elaborated according kinetics model for calculate an effective diffusion coefficient two directions. Such higher direction than perpendicular it,...