Densification Behaviors in the Early Stage of Spark Plasma Sintering of 3Y-TZP Nanoceramics

2016 ◽  
Vol 697 ◽  
pp. 173-177
Author(s):  
Yan Xiong ◽  
Ling Wang ◽  
Chong Liu
Keyword(s):  
Spark Plasma Sintering ◽  
Early Stage ◽  
Tetragonal Zirconia ◽  
Densification Rate ◽  
Heating Rates ◽  
Particle Rearrangement ◽  
Plasma Sintering ◽  
Rearrangement Mechanism ◽  
Spark Plasma ◽  
Tetragonal Zirconia Polycrystal

The early-stage sintering behaviours of 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics during spark plasma sintering (SPS) was investigated using different pressure and heating regimes.It was found that dependent neither on pressure value (20~100 MPa) nor heating rates higher than 50 °C/min, the maximum densification rate had always been observed at rather similar ~78% of theoretical density (TD), where the grain growth was rather moderate. A novel intensive-particle-rearrangement mechanism was proposed to dominate the rapid densification of early-stage SPS process, by which yielded the considerable faster densification rate than those achievable by diffusion-related processes.Present findings showed the possibility of particle rearrangement in high density compacts and the effects of classic particle rearrangement should be re-evaluated in nanoceramic sintering.

scholarly journals Intensive particle rearrangement in the early stage of spark plasma sintering process

2015 ◽  
Vol 3 (2) ◽  
pp. 183-187 ◽  
Author(s):  
Ling Wang ◽  
Vaclav Pouchly ◽  
Karel Maca ◽  
Zhijian Shen ◽  
Yan Xiong
Keyword(s):  
Spark Plasma Sintering ◽  
Early Stage ◽  
Sintering Process ◽  
Particle Rearrangement ◽  
Plasma Sintering ◽  
Spark Plasma

Highly Infrared Transparent Nanometric Tetragonal Zirconia Prepared by High-Pressure Spark Plasma Sintering

2011 ◽  
Vol 94 (9) ◽  
pp. 2739-2741 ◽  
Author(s):  
Haibin Zhang ◽  
Zhipeng Li ◽  
Byung-Nam Kim ◽  
Koji Morita ◽  
Hidehiro Yoshida ◽  
...  
Keyword(s):  
High Pressure ◽  
Spark Plasma Sintering ◽  
Tetragonal Zirconia ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Effect of Alumina Dopant on Transparency of Tetragonal Zirconia

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Haibin Zhang ◽  
Zhipeng Li ◽  
Byung-Nam Kim ◽  
Koji Morita ◽  
Hidehiro Yoshida ◽  
...  
Keyword(s):  
High Pressure ◽  
Beneficial Effect ◽  
Spark Plasma Sintering ◽  
Tetragonal Zirconia ◽  
High Density ◽  
Starting Material ◽  
Plasma Sintering ◽  
Spark Plasma

Aiming to characterize the effect of alumina dopant on transparency, powders of yttria stabilized tetragonal zirconia doped with alumina (TZ-3Y-E) are used as starting material to fabricate transparent tetragonal ZrO2by high-pressure spark plasma sintering (HP-SPS). However, low transparency of the resultant TZ-3Y-E specimens does not suggest a beneficial effect of alumina dopant although nanometric grains and high density have been achieved. The mechanism is analyzed by comparing with the results of as-sintered yttria stabilized tetragonal zirconia without alumina dopant.

scholarly journals Calculation of the Temperature Distribution in Cylindrical Samples of Alumina and Copper Produced by Spark Plasma Sintering

Ceramics ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 437-446
Author(s):  
Vyacheslav V. Krizhanovskiy ◽  
Vyacheslav I. Mali
Keyword(s):  
Electrical Conductivity ◽  
Temperature Distribution ◽  
Aluminum Oxide ◽  
Physicochemical Properties ◽  
Spark Plasma Sintering ◽  
Numerical Calculations ◽  
Heating Rates ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Cylindrical Samples

Numerical calculations were carried out to simulate, under conditions of close spark plasma sintering (SPS), the temperature distribution during the passage of current in dense cylindrical samples of two materials: aluminum oxide and copper located in graphite forms and clamped between cylindrical graphite punches. The investigated materials differ greatly in their electrical conductivity and other physicochemical properties. Calculations were carried out for various geometric parameters of the samples, as well as graphite molds and punches at varying heating rates from the passing current.

Densification Behavior of Calcium Phosphates on Spark Plasma Sintering

2006 ◽  
Vol 309-311 ◽  
pp. 171-174 ◽  
Author(s):  
Daisuke Kawagoe ◽  
Yoshihiro Koga ◽  
Noriko Kotobuki ◽  
Hajime Ohgushi ◽  
Emile Hideki Ishida ◽  
...  
Keyword(s):  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Tricalcium Phosphate ◽  
Early Stage ◽  
Calcium Phosphates ◽  
The Other ◽  
Transparent Ceramics ◽  
Densification Behavior ◽  
Plasma Sintering ◽  
Spark Plasma

Ceramics of hydroxyapatite (Ca10(PO4)6(OH)2: HA) and β-tricalcium phosphate (β-Ca3(PO4)2: β-TCP), were prepared by spark plasma sintering (SPS) at the temperatures from 800 °C to 1000 °C for 10 min with a heating rate of 25 °C·min-1. The HA ceramics prepared at 900 °C and 1000 °C showed transparency. On the other hands, transparent β-TCP ceramics was obtained by SPS at 1000 °C. In analysis of the densification behavior during sintering of HA and β-TCP by SPS, dominant sintering mechanism was plastic flow in the early stage of densification. Transparent ceramics should be the most suitable materilas to investigate the interface between human cells and ceramics.

Fabrication of high-strength transparent MgAl2O4 spinel polycrystals by optimizing spark-plasma-sintering conditions

2009 ◽  
Vol 24 (9) ◽  
pp. 2863-2872 ◽  
Author(s):  
Koji Morita ◽  
Byung-Nam Kim ◽  
Keijiro Hiraga ◽  
Hidehiro Yoshida
Keyword(s):  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Bending Strength ◽  
High Strength ◽  
High Heating Rate ◽  
Heating Rates ◽  
Four Point Bending ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Optical And Mechanical Properties

By optimizing the heating rate during spark-plasma-sintering (SPS) processing, a high-strength transparent spinel (MgAl2O4) can be successfully fabricated for only a 20-min soak at 1300 °C. For the heating rates of ≤10 °C/min, the spinel exhibits an excellent combination of in-line transmission (50–70%), four-point-bending strength (>400 MPa), and hardness (>15 GPa). The excellent optical and mechanical properties can be ascribed to the superimposed effects of the sub-micrograin size, fine-pore size, and low porosity, which are related closely to the heating rate during the SPS processing. The present study demonstrates that to attain a high-strength transparent spinel at low temperatures and short sintering times, the low-heating-rate SPS processing is more efficient compared with the high-heating-rate SPS processing.

Spark-Plasma Sintering of Molybdenum Disilicide

2005 ◽  
Vol 287 ◽  
pp. 160-165 ◽  
Author(s):  
Ji Soon Kim ◽  
Young Do Kim ◽  
Choong Hyo Lee ◽  
Pyuck Pa Choi ◽  
Young Soon Kwon
Keyword(s):  
Relative Density ◽  
Spark Plasma Sintering ◽  
Silicon Oxide ◽  
Average Particle Size ◽  
Molybdenum Disilicide ◽  
Milling Process ◽  
Average Particle ◽  
Densification Rate ◽  
Plasma Sintering ◽  
Spark Plasma

The effect of milling on the densification behavior of MoSi2 powder during spark-plasma sintering (SPS) was investigated. MoSi2 starting powder with an average particle size of 10 µm was milled to reduce particle sizes to less than 1 µm. Sintering was performed in a SPS facility, varying the sintering temperature from 1200°C to 1500°C. Changes in relative density and the densification rate were measured as a function of temperature. Additionally, the microstructure of sintered compacts was analyzed by means of SEM and EPMA. The sintered density was lower for ballmilled powder compacts (having 94-95% relative density) than for as-received ones (having 94- 98% relative density) despite a higher densification rate of the former in the early and middle stages of sintering. These apparently contradictory results can be explained by a pick-up of oxygen (from 0.3 to 1.8 wt. % O) during the milling process, leading to the formation of silicon oxide and its decomposition into a gas phase at temperatures above 1200°C.

scholarly journals Recent Advances and Future Prospects in Spark Plasma Sintered Alumina Hybrid Nanocomposites

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1607 ◽  
Author(s):  
Saheb ◽  
Hayat ◽  
Hassan
Keyword(s):  
Spark Plasma Sintering ◽  
Early Stage ◽  
Nanocomposite Materials ◽  
Hybrid Nanocomposites ◽  
Future Prospects ◽  
Plasma Sintering ◽  
The Matrix ◽  
Spark Plasma ◽  
Hybrid Ceramic ◽  
Ceramic Nanocomposites

Although ceramics have many advantages when compared to metals in specific applications, they could be more widely applied if their low properties (fracture toughness, strength, and electrical and thermal conductivities) are improved. Reinforcing ceramics by two nano-phases that have different morphologies and/or properties, called the hybrid microstructure design, has been implemented to develop hybrid ceramic nanocomposites with tailored nanostructures, improved mechanical properties, and enhanced functionalities. The use of the novel spark plasma sintering (SPS) process allowed for the sintering of hybrid ceramic nanocomposite materials to maintain high relative density while also preserving the small grain size of the matrix. As a result, hybrid nanocomposite materials that have better mechanical and functional properties than those of either conventional composites or nanocomposites were produced. The development of hybrid ceramic nanocomposites is in its early stage and it is expected to continue attracting the interest of the scientific community. In the present paper, the progress made in the development of alumina hybrid nanocomposites, using spark plasma sintering, and their properties are reviewed. In addition, the current challenges and potential applications are highlighted. Finally, future prospects for developing alumina hybrid nanocomposites that have better performance are set.

Structure of Nanocrystalline Nickel Prepared by Powder Metallurgy

2015 ◽  
Vol 647 ◽  
pp. 102-107
Author(s):  
Alena Michalcová ◽  
Petra Svobodová ◽  
Ivo Marek ◽  
Dalibor Vojtěch ◽  
Tomáš František Kubatík
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Selective Leaching ◽  
Heating Rates ◽  
Nanocrystalline Nickel ◽  
Preparation Conditions ◽  
Plasma Sintering ◽  
High Heating ◽  
Spark Plasma ◽  
Sintering Method

Nanocrystaline nickel was prepared by selective leaching technology. Consequently, the powder was compacted by spark plasma sintering method. This process is suitable due to its high heating rates, which leads to relatively low thermal exposition of compacted material. The dependence of structure of compacted material on preparation conditions is described in this paper.

Interparticle Liquid Film Formation during Spark Plasma Sintering of Inconel 718 Superalloy

2011 ◽  
Vol 409 ◽  
pp. 763-768
Author(s):  
David Levasseur ◽  
Mathieu Brochu
Keyword(s):  
Spark Plasma Sintering ◽  
Inconel 718 ◽  
Film Formation ◽  
Full Density ◽  
Heating Rates ◽  
Machining Time ◽  
Fast Heating ◽  
Plasma Sintering ◽  
Main Challenge ◽  
Spark Plasma

The use of powder metallurgy for near net shape sintering of superalloy could lead to major savings in machining time and material. The main challenge in sintering Inconel 718 is to avoid the formation of a prior particle boundary (PPB) network that is deleterious to the mechanical properties. Using the Spark Plasma Sintering (SPS) technique, it is believed that Inconel 718 powders could be sintered without forming a PPB network due to the fast heating rate achieved and the reported cleaning effect of particle surfaces by the interparticle arc discharges. In this study, Inconel 718 was consolidated to near-full density at 1200°C under 50 MPa of pressure with heating rates ranging from 20°C/min to 800°C/min. The densification behavior of the powder was studied through the analysis of the densification curves and observation of the microstructure evolution from interrupted tests. The fast densification of Inconel 718 in SPS was linked to the formation of a supersolidus liquid phase due to the nature of the heating in this technique.

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