Development of Compositional Gradient Simulation for Centrifugal Slurry-Pouring Methods

2009 ◽  
Vol 631-632 ◽  
pp. 455-460 ◽  
Author(s):  
Keisuke Kinoshita ◽  
Hisashi Sato ◽  
Yoshimi Watanabe
Keyword(s):  
Centrifugal Force ◽  
Functionally Graded ◽  
Green Body ◽  
Compositional Gradient ◽  
Graded Materials ◽  
Plasma Sintering ◽  
Gradient Composition ◽  
Spark Plasma ◽  
Component Particle ◽  
Sintering Method

Centrifugal slurry-pouring method has been proposed to fabricate the functionally graded materials (FGMs) with large compositional gradient. This processing method uses the two types of slurries (slurry 1 and slurry 2). The prepared slurry 1 containing one component, particle A, is firstly poured into the mold under the centrifugal force and then the slurry 2 containing two components, particle A and particle B, is poured into the mold. By this process, green body with gradient composition can be obtained and then green body will be sintered by Spark Plasma Sintering method. Finally, it is expected that FGM with gradient from 100% component A at one surface to 100% B at other surface can be fabricated. In this study, the graded distributions of the particle A and particle B within the slurry 2 under the centrifugal force were simulated analyzing the movement of particles in liquid. Moreover, Ti-SiO2 FGMs were experimentally fabricated. The Ti-SiO2 FGM has large compositional gradient on one side of FGM. However, when the size of solid-particle is small, it is difficult to form large compositional gradient in the FGM. This phenomenon obtained by experiment is in agreement with the calculated results. From this result, it is found that the centrifugal slurry-pouring method using different slurries is effective fabrication method for FGMs with large compositional gradient.

scholarly journals Formation Behavior of Continuous Graded Composition in Ti-ZrO2Functionally Graded Materials Fabricated by Mixed-Powder Pouring Method

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Murali Jayachandran ◽  
Hideaki Tsukamoto ◽  
Hisashi Sato ◽  
Yoshimi Watanabe
Keyword(s):  
Functionally Graded ◽  
Green Body ◽  
Compositional Gradient ◽  
Mixed Powder ◽  
Graded Materials ◽  
Experimental Procedure ◽  
Suspension Medium ◽  
Plasma Sintering ◽  
Formation Behavior ◽  
Spark Plasma

A mixed-powder pouring method has been proposed to fabricate functionally graded materials (FGMs) with the desired compositional gradient. The experimental procedure involves preparation of mixed powders consisting of more than two types of particles with different size and/or density, which exhibit different velocities in suspension and sedimentation to form the green body under gravity conditions. The green body was sintered by a spark plasma sintering (SPS) method. The initiation of the particle settlement was precisely controlled by using crushed ice as the suspension medium. Ti-ZrO2FGMs were fabricated, in this study, using different sizes of ZrO2and Ti particles. Vickers hardness confirmed the compositional gradient in the fabricated FGMs. A numerical simulation was also carried out to analyze the particle movement inside the suspension medium during the formation process and predict compositional gradient in the FGMs.

scholarly journals Porosity and Microstructure Iron-Based Graded Materials Sintered by Spark Plasma Sintering and the Conventional Method

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 264
Author(s):  
Krzysztof Zarębski ◽  
Piotr Putyra ◽  
Dariusz Mierzwiński
Keyword(s):  
Spark Plasma Sintering ◽  
Graded Materials ◽  
Gradient Zone ◽  
Die Filling ◽  
Plasma Sintering ◽  
Gradient Microstructure ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Local Range ◽  
Sintering Method

Using PNC-60 powder with the addition of graphite, cylindrical products characterized by different compositions of core and outer layers were made. Some compacts were sintered via the conventional process, while others were subjected to the spark plasma sintering method (SPS) at different times and temperatures. The gradient microstructure was obtained in the transition zone by mixing powders during die filling, followed by pressing and diffusion during sintering. The effect of sintering parameters on the nature of the gradient zone and the morphology of the pores was shown. After conventional sintering, the gradient zone was wider than it was after SPS. Via SPS, the short sintering time confined the diffusion to a local range, making its influence on the gradient structure negligible. Differences in the microstructure were confirmed by functional description.

Preparation of Mg-W Graded Materials by Spark Plasma Sintering

2008 ◽  
Vol 368-372 ◽  
pp. 1869-1871
Author(s):  
Qiang Shen ◽  
Ying Hu Liu ◽  
Jing Zhou ◽  
Guo Qiang Luo ◽  
Lian Meng Zhang
Keyword(s):  
Spark Plasma Sintering ◽  
Low Temperatures ◽  
Functionally Graded ◽  
Front Face ◽  
Density Range ◽  
Graded Materials ◽  
Compression Waves ◽  
Plasma Sintering ◽  
Mass Fractions ◽  
Spark Plasma

A new kind of functionally graded materials (FGM) with density gradient has come to show great potentials as flier-plates for creating quasi-isotropic compression waves. In order to meet the demand of lower density in the front face and wider density range for such flier-plate, Mg with a density of 1.74g/cm3 and W of 19.3g/cm3 are selected to make Mg-W system density graded materials. Mg-W alloys with various mass fractions of Mg and W were sintered by spark plasma sintering (SPS) technique at low temperatures, and the processing of densification is mainly investigated. It is found that, up to 92wt%W, the Mg-W alloys can be fully densified at 873K due to the conglutination of Mg particles. The Mg-W alloys still exist as a mechanical mixture of Mg and W. Finally, the Mg-W density graded materials with a density change from 1.74g/cm3 to 10.55g/cm3 have been successfully prepared.

Preparation of Functionally Graded Cu/AlN/Cu Electrode Materials for Thermoelectric Devices

2007 ◽  
Vol 336-338 ◽  
pp. 2613-2615 ◽  
Author(s):  
Huai Quan Zhang ◽  
Jing Feng Li
Keyword(s):  
Spark Plasma Sintering ◽  
Functionally Graded Materials ◽  
Electrode Materials ◽  
Functionally Graded ◽  
Thermoelectric Devices ◽  
Graded Materials ◽  
Step Process ◽  
Plasma Sintering ◽  
Spark Plasma

The Cu/AlN/Cu functionally graded materials (FGMs) were successfully fabricated using the spark plasma sintering (SPS) method, and a two-step process was used. First, a symmetrical porositygraded AlN plate was prepared using AlN powder consisting of particles of varying sizes. Afterwards, graded Cu/AlN/Cu samples were made by introducing Cu into the pores of the external, porous AlN layer.

Functionally Graded Nano Hardmetal Materials Made by Spark Plasma Sintering Technology

2005 ◽  
Vol 23 ◽  
pp. 179-182 ◽  
Author(s):  
Xinglong Tan ◽  
Shaoyu Qiu ◽  
Wenyan He ◽  
Daifu Lei
Keyword(s):  
Stainless Steel ◽  
Internal Stress ◽  
Spark Plasma Sintering ◽  
Functionally Graded Materials ◽  
Functionally Graded ◽  
The Other ◽  
Graded Materials ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Processes

The properties of nano WC/Co hardmetals prepared by different Spark Plasma Sintering processes were measured. A 4-layer Functionally Graded Materials (FGM) was also obtained by Spark Plasma Sintering technology (SPS), starting from powders of nano WC/10%Co, nano WC/12%Co, micro WC/15%Co and stainless steel disk. The other 3-layer FGM was made from powders of nano 21%Al2O3/ZrO2, nickel and stainless steel. The SPS processing led to FGM free of internal stress, which was measured using Vickers indentations.

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