Processing and Characterization of Porous Titanium for Orthopedic Implant Prepared by Argon-atmospheric Sintering and Arc Plasma Sintering

Annur, Dhyah; Rokhmanto, Fendy; Thaha, Yudi Nugraha; Kartika, Ika; Dimyati, Arbi; Supriadi, Sugeng; Suharno, Bambang

doi:10.1590/1980-5373-mr-2021-0122

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…У роботі [7] описано фізико-механічні властивості імплантів, створених на основі титанового порошку. Вказані тут дані по пористості дозволять оцінити реалістичність розробленої моделі.…”

Section: вступunclassified

Модель Формування Пористості Брикетів Губчастого Титану На Стадії Спікання

Klymenko¹,

Andrieiev²,

Sluchak³

et al. 2023

aktt

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This article examines the peculiarities of the formation of interparticle connections in porous products based on titanium powders using sponge titanium as an example, which are used in the aviation industry and airfield management. The developed model is based on the results of a previous study, where the structure of cuboctahedral and inverse cuboctahedral clusters of packing spherical powder particles was determined at the most dense packing. During the study, a model of the fusion of particles at the points of pressing deformation due to recrystallization under the influence of high temperatures in a vacuum was developed. 4 main stages of powder briquette sintering were considered, and a mathematical model was developed for each of them. Thus, the stage of liquid evaporation is considered from the viewpoint of the cavitation effect of boiling on the surface of particles and boiling of plasticizers. Euler's film boiling formula was used to describe the forces acting on the particle surface; Tolubinsky's formula was used for bubble boiling; convective heat exchange was considered part of the final stage of sintering. The stage of the formation of metallic bonds is modeled on the basis of the results of practical studies in the REV 5.5 furnace, recrystallization based on differential scanning colorimetry on the NETZSCH STA 449F1 Proteus device, and determining the change in grain size according to the E19 ASTM scales using the Jeffers method. The diffusion stage is modeled on the basis of the approximation of the particle deformation model in the contact zones at the pressing stage using the Frenkel formula. Linear shrinkage is modeled based on direct measurement of sample sizes before and after sintering. The developed model has a certain versatility when applied to simulate the interaction of particles of metal powders under the conditions of the formation of porous briquettes, especially if the shape of the particles is close to round or spongy. The obtained result will make it possible to more accurately evaluate such a factor as the adhesion between the particles of the pressing and predict the tensile strength of the material. Additionally, due to the mathematical characterization of the peculiarities of the formation of corpuscular porosity under the conditions of sintering in a vacuum, we can design materials with differentiated porosity, as well as lay the foundations for powder 3D printing of such materials, by assembling grain by grain, or layer by layer with the adjustment of the force of particle compression one into the other.

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Section: вступunclassified

Модель Формування Пористості Брикетів Губчастого Титану На Стадії Спікання

Klymenko¹,

Andrieiev²,

Sluchak³

et al. 2023

aktt

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“…In this context, studies on design improvements and special-purpose modifications related to traditional manufacturing methods such as casting, machining, welding, powder metallurgy, and plastic forming continue rapidly. At this point, the casting of particle-reinforced composites and foams for the aerospace and automotive industries (crash boxes and body elements) [1-3], micro-machining for biomedical implants, and macro-machining for hybrid composites [4,5], different types of friction stir welding processes for the structural continuity of metals [6,7], microwave and spark plasma sintering methods for composite and biomedical applications [8,9], and simulation/model…”

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Simulation of Fused Deposition Modeling of Glass Fiber Reinforced ABS Impact Samples: The Effect of Fiber Ratio, Infill Rate, and Infill Pattern on Warpage and Residual Stresses

Ergene

Bolat

2023

Hittite Journal of Science and Engineering

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It is known that products made of polymer materials or especially polymer materials with glass fiber and carbon fiber are used in many different areas such as automotive, aerospace, and defense. At this point, studies in the literature have gained momentum due to the combination of fiber-reinforced polymer materials emerging as a result of technological developments and industrial demands, and the fused deposition modeling (FDM) method providing the production of parts in desired sizes and complexity. Residual stresses and distortions occurring in polymer-based composite parts produced with FDM are among the problems that should be minimized. In this study, the influences of fiber ratio (%10, %15, and %20), infill rate (%20, %50, and %80), and infill pattern (line, honeycomb, and triangle) on the residual stresses and warpages generating in impact test specimens produced from glass fiber reinforced ABS filaments by fused deposition modeling were tried to be determined with the Digimat 2021 program. As a result of the findings, it was determined that the distortion values decreased and the thermal residual stress values went up with the increase in fiber ratio and infill rate. In addition, it can be reported that the distortions that bring out as a result of the separation of the produced parts from the production platform are caused by the high deformations condensing at the lower corner points of the parts.

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