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Full-Text Articles in Engineering
Features Of Grain Growth And Grain Boundary Formation Under Microwave And Spark Plasma Sintering Conditions, Ostap Zgalat, Andrey Ragulya
Features Of Grain Growth And Grain Boundary Formation Under Microwave And Spark Plasma Sintering Conditions, Ostap Zgalat, Andrey Ragulya
Electric Field Assisted Sintering and Related Phenomena Far From Equilibrium
The feedback properties of particulate nanomaterials versus their structure parameters (grain size, pore size), were found much more sensitive than that in conventional materials [1-3]. Among them field assisted sintering techniques including SPS and microwave sintering (MWS) were intensively developed [4-9]. The effect of inhibited grains growth for nanomaterials was established for Field Assisted Sintering Technology [4,5,8,9].
The FAST or Spark Plasma Sintering (SPS) is a rapid rate consolidation technology where effect of electromagnetic field enhanced by external pressure. The studies of FAST densification for nano-TiN shows the possibility to substantially inhibit the grain growth and fabricate materials with grains …
Field Assisted Sintering: Challenges In Scale–Up From Buttons To Body Armor, Christopher Haines
Field Assisted Sintering: Challenges In Scale–Up From Buttons To Body Armor, Christopher Haines
Electric Field Assisted Sintering and Related Phenomena Far From Equilibrium
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Field assisted sintering technology (FAST) aka spark plasma sintering (SPS) has begun transitioning out of academic research institutions and into industry and government laboratories. With this transition, there has been considerable challenges in scaling up the sample sizes from ‘buttons’ to larger prototype parts. The primary challenges lie in areas such as temperature/density uniformity, tooling/die design, and near-net-shaping. This paper will report on the results of a 5-year manufacturing technology development program which scaled up parts from 30 mm diameter buttons to 250 mm x 200 mm tiles. We will discuss the influence of tooling material and geometry on …
Sps For Chemical Preparations, Ihor Veremchuk
Sps For Chemical Preparations, Ihor Veremchuk
Electric Field Assisted Sintering and Related Phenomena Far From Equilibrium
The Spark Plasma Sintering (SPS) has been developed for shaping materials by combining simultaneously uniaxial pressure (using direct contact with the sample) and the application of an direct electric field. Even though the key mechanisms controlling SPS are still debated, this technique shows a number of advantages – (i) reduction of sintering time, (ii) rapid densification and (iii) grain growth suspension – which are helpful for tailoring the microstructure of functional materials and thus optimize their electronic transport, mechanical and/or thermal properties.
The diffusion rate of SPS conditions was reported to become extremely large at relative low temperatures due to …
The Mechanisms Of Field Assisted Sintering In Metallic Systems, Johannes Trapp
The Mechanisms Of Field Assisted Sintering In Metallic Systems, Johannes Trapp
Electric Field Assisted Sintering and Related Phenomena Far From Equilibrium
Using the advantages of Spark Plasma Sintering to produce superior materials, e.g. with potentially new phases, first requires a profound understanding of the densification mechanisms that are active during the process. The research presented contributes to this understanding by connecting temperature and pressure distribution in the particles with rate and activation energy of densification in pure copper.
Activation energy (Q) has been determined using a method originally developed by J. E. Dorn. Therewith, the activation energy for diffusion controlled processes can be extracted from densification rate measurements without the results being influenced by errors in measuring the density of the …
Development Of Electric Current Activated/Assisted Sintering (Ecas/Sps), Salvatore Grasso
Development Of Electric Current Activated/Assisted Sintering (Ecas/Sps), Salvatore Grasso
Electric Field Assisted Sintering and Related Phenomena Far From Equilibrium
The electric current activated/assisted sintering (ECAS) is an ever growing class of versatile techniques for sintering particulate materials. ECAS was pioneered by Bloxam in 1906. As illustrated in Fig. 1, ECAS development is emblematic of its technological and scientific importance. Nowadays, most of the scientific attention is focused on the Spark Plasma Sintering (SPS) technology originated in 1966 by Dr. Inoue [1].
Essentially, SPS exploits the same punch/die system concept as the more familiar hot pressing (HP) process. The powder is placed in the die and subsequently pressed between two counter-sliding punches. Mechanical loading is normally uniaxial. SPS and HP …
Microscopic Densification Mechanisms Of Metallic Systems By Spark Plasma Sintering, Jean Philippe Monchoux
Microscopic Densification Mechanisms Of Metallic Systems By Spark Plasma Sintering, Jean Philippe Monchoux
Electric Field Assisted Sintering and Related Phenomena Far From Equilibrium
This study reports on the microscopic mechanisms accounting for the fast densification kinetics of metallic materials processed by spark plasma sintering (SPS). Metallic systems have been chosen in reason of their elevated electric conductivity. Hence, an important fraction of the electric current of the SPS passes through the powder, and electrically induced new mechanisms, or acceleration of conventional ones (e.g. plasticity, diffusion), can be expected. TiAl powder and Ag-Zn diffusion couple have thus been chosen to study the influence of the electric current on plasticity and on diffusion, respectively.
An originality of this work was to observe by transmission electron …