The Effect of Particle Shape on Sintering Behavior and Compressive Strength of Porous Alumina

Miyake, Kimiya; Hirata, Yoshihiro; Shimonosono, Taro; Sameshima, Soichiro

doi:10.3390/ma11071137

Cited by 57 publications

(22 citation statements)

References 21 publications

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“…For this modified surface, the average E value was approximately 359.3 GPa on the ceramic surface layer, followed by 278.0 GPa on the diffused phase and 200.4 GPa on the steel substrate. It can be stated that the obtained Young's modulus for the multi-phase ceramic layer was a value similar to the alumina-like (Al 2 O 3 ) properties, around 360.0 GPa [23]. The selective diffusion layer formed a composite characteristic between E values of alumina and steel, whereas on the main steel substrate, it remained unchanged for approximately 200.0 GPa, in agreement with the typical Young's modulus ranges of steel.…”

Section: Resultssupporting

confidence: 73%

From Waste to Multi-Hybrid Layering of High Carbon Steel to Improve Corrosion Resistance: An In-Depth Analysis Using EPMA and AFM Techniques

et al. 2019

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Corrosion resistance of steel has attracted substantial interest for manufacturing applications to reduce costs corresponding to part failures, unexpected maintenance, and shortening lifespan. Meanwhile, millions of tonnes of slag, non-recyclable glass, and automotive shredder residue (ASR) are discarded into landfills every year, polluting the environment. Combining these two major issues, we delivered an alternative solution to enhance corrosion resistance of high-C steel. In this research, utilisation of these wastes (which were chemically bonded into steel substrate) as sources for production of multi-hybrid layering—including the multi-phase ceramic layer, the carbide layer, and the selective diffusion layer—was successfully achieved by single step surface modification technology. High-resolution topographical imaging by SEM and chemical composition analysis in micron-volume by electron probe micro analyser (EPMA) were performed. Nano-characterisation by atomic force microscopy (AFM) using the PeakForce quantitative nanomechanical mapping (PF-QNM) method was conducted to define Young’s modulus value of each phase in detail. Results revealed improvement of corrosion resistance by 39% and a significantly increased hardness of 13.58 GPa. This integrated approach is prominent for economic and environmental sustainability, consolidating industry demands for more profits, producing durable, steel components in a cost effective way to reduce dependency on new resources, and minimising negative impacts to the environment from disposal of wastes to the landfills.

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Section: Resultssupporting

confidence: 73%

From Waste to Multi-Hybrid Layering of High Carbon Steel to Improve Corrosion Resistance: An In-Depth Analysis Using EPMA and AFM Techniques

et al. 2019

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“…The NiTi powder particles have a shape factor close to 1 ( Figure 2 ) [ 19 , 20 ]. The particle size was d 50 = 22.1 µm ( Figure 3 ), which is typical of powder particles used in direct additive processes (i.e., SLM and electron beam melting (EBM)), but they could contribute to problems during sintering in indirect processes.…”

Section: Methodsmentioning

confidence: 99%

In Search of the Optimal Conditions to Process Shape Memory Alloys (NiTi) Using Fused Filament Fabrication (FFF)

Carreira

Cerejo²,

Alves

et al. 2020

Materials

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This research was performed so as to investigate the additive manufacturing of NiTi shape memory alloys, which is associated with direct processes, such as selective laser melting. In addition to its expensive production costs, NiTi readily undergoes chemical and phase modifications, mainly as a result of Ni loss during processing as a result of high temperatures. This research explores the potential usefulness of NiTi as well as its limitations using indirect additive processes, such as fused filament fabrication (FFF). The first step was to evaluate the NiTi critical powder volume content (CPVC) needed to process high-quality filaments (via extrusion). A typical 3D printer can build a selected part/system/device layer-by-layer from the filaments, followed by debinding and sintering (SDS), in order to generate a near-net-shape object. The mixing, extruding (filament), printing (shaping), debinding, and sintering steps were extensively studied in order to optimize their parameters. Moreover, for the sintering step, two main targets should be met, namely: the reduction of contamination during the process in order to avoid the formation of secondary phases, and the decrease in sintering temperature, which also contributes to reducing the production costs. This study aims to demonstrate the possibility of using FFF as an additive manufacturing technology for processing NiTi.

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“…The effects of clustering and interfacial debonding of particles on the mechanical properties of sintered materials were the topic of majority of the prior studies. Number of studies confirmed the fact that less porosity in the material microstructure leads to higher material stiffness and strength, while an irregular shape of pores strongly influences the material fracture toughness and strength [3][4][5][6][7]. But sometimes porosity is quite necessary e.g.…”

Section: Introductionmentioning

confidence: 94%

Numerical modeling of the porosity influence on the elastic properties of sintered materials

et al. 2019

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The effect of structural porosity on the elastic properties of sintered materials was studied using the new multi-pore unit cell numerical model-MPUC. Comparison between proposed MPUC model and previously adopted two-phase unit cell-FCC numerical model as well as available experimental data in literature, was done by comparing obtained values for modulus of elasticity-E, shear modulus-G and Bulk modulus-K. Results obtained by proposed MPUC model are in excellent agreement with available experimental data in literature. It was confirmed that material porosity regarding pores' size (volume fraction) has noticeable influence on elastic properties of sintered material. Less porosity in the material microstructure generally leads to noticeable higher values of E, G and K. For fixed volume fraction, shape of pores has no significant influence on elastic characteristics.

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The Effect of Particle Shape on Sintering Behavior and Compressive Strength of Porous Alumina

Cited by 57 publications

References 21 publications

From Waste to Multi-Hybrid Layering of High Carbon Steel to Improve Corrosion Resistance: An In-Depth Analysis Using EPMA and AFM Techniques

From Waste to Multi-Hybrid Layering of High Carbon Steel to Improve Corrosion Resistance: An In-Depth Analysis Using EPMA and AFM Techniques

In Search of the Optimal Conditions to Process Shape Memory Alloys (NiTi) Using Fused Filament Fabrication (FFF)

Numerical modeling of the porosity influence on the elastic properties of sintered materials

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