Effect of Particle Shape on Dispersion Formation of Harmonic Microstructure of Si3N4-ZrO2

2016 ◽  
Vol 864 ◽  
pp. 47-51 ◽  
Author(s):  
Lydia Anggraini ◽  
Yuta Natsume ◽  
Kei Ameyama
Keyword(s):  
Mechanical Properties ◽  
Mechanical Milling ◽  
Bending Strength ◽  
Powder Processing ◽  
Ceramic Matrix Composites ◽  
Zirconia Ceramic ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Particle Shapes

Silicon nitride with 50 mass zirconia ceramic matrix composites were processed by mechanical milling (MM) followed by spark plasma sintering (SPS). Two different of Si3N4 particle shapes for create harmonic microstructure were investigated. The microstructure of Si3N4-ZrO2 with initial Si3N4 shape is like coin/flakes after MM for 144 ks was failed to create the harmonic microstructure after SPS. With another sphere shape of Si3N4 after MM for 144 ks, the harmonic microstructure could be formed after SPS. Thus, the initial powders shape of Si3N4 have an effect in the formation of harmonic microstructure could be fully achieved. The highest mechanical properties of Si3N4-ZrO2 are on the powders with mechanical milling time for 144 ks. The Si3N4 ceramic with homogeneous fine grains of ZrO2 dispersed on its surface was obtained, and the mechanical properties were improved. The Vickers hardness obtained on 144 ks is 1031 MPa and the bending strength is 262 MPa. The main factors explaining the improvement in the mechanical properties of Si3N4-ZrO2 are considered to be the porosity decrease caused by the particles shape and appropriate condition of powder processing i.e. MM and SPS.

scholarly journals Sinterability and characterization of Ag/Al2O3 metal and ceramic matrix composites processed by mechanical milling

2020 ◽  
Vol 52 (3) ◽  
pp. 245-255
Author(s):  
Ramin Davodi ◽  
Mohammad Ardestani ◽  
Arqavan Kazemi
Keyword(s):  
Flexural Strength ◽  
Mechanical Milling ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
The Other ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Al2o3 Composite ◽  
Spark Plasma

In this research, the sinterability of Ag/Al2O3 milled powders with 10 and 90 wt%Ag were investigated. The powders were consolidated by two different processes including conventional and spark plasma sintering. The conventionally sintered composites with 90 wt%Ag were further densified by cold pressing and subsequent annealing at 700?C. The microstructural evaluations confirmed a fine dispersion of the constituents within the microstructure of the spark plasma sintered composites. Moreover, the results showed that the relative density, hardness, and flexural strength of the spark plasma sintered samples were much higher than those of the other samples. The hardness and flexural strength of Ag/10 wt%Al2O3 spark plasma sintered samples at 650?C were 146 HV and 264 MPa, respectively. However, unlike the composite with 90 wt%Ag, the applied sintering temperatures have not led to the synthesis of an Ag/90 wt% Al2O3 composite with the desired properties

scholarly journals Preceramic Paper-Derived SiCf/SiCp Composites Obtained by Spark Plasma Sintering: Processing, Microstructure and Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 607 ◽  
Author(s):  
Li ◽  
Kashkarov ◽  
Syrtanov ◽  
Sedanova ◽  
Ivashutenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spark Plasma Sintering ◽  
Physical And Mechanical Properties ◽  
Ceramic Matrix Composites ◽  
Processing Parameters ◽  
Matrix Composites ◽  
Sic Fibers ◽  
Plasma Sintering ◽  
The Matrix ◽  
Spark Plasma

Ceramic matrix composites (CMCs) based on silicon carbide (SiC) are promising materials for applications as structural components used under high irradiation flux and high temperature conditions. The addition of SiC fibers (SiCf) may improve both the physical and mechanical properties of CMCs and lead to an increase in their tolerance to failure. This work describes the fabrication and characterization of novel preceramic paper-derived SiCf/SiCp composites fabricated by spark plasma sintering (SPS). The sintering temperature and pressure were 2100 °C and 20–60 MPa, respectively. The content of fibers in the composites was approx. 10 wt.%. The matrix densification and fiber distribution were examined by X-ray computed tomography and scanning electron microscopy. Short processing time avoided the destruction of SiC fibers during SPS. The flexural strength of the fabricated SiCf/SiCp composites at room temperature varies between 300 and 430 MPa depending on the processing parameters and microstructure of the fabricated composites. A quasi-ductile fracture behavior of the fabricated composites was observed.

Enhanced mechanical properties of carbon nanotube-reinforced magnesium composites with zirconia fabricated by spark plasma sintering

2021 ◽  
pp. 002199832199391
Author(s):  
Hideaki Tsukamoto
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Spark Plasma Sintering ◽  
Bending Strength ◽  
Matrix Composites ◽  
Three Point Bending ◽  
Plasma Sintering ◽  
Uniform Dispersion ◽  
Spark Plasma ◽  
Magnesium Composites

This study aims to enhance carbon nanotube (CNT)-reinforced magnesium (Mg) matrix composites fabricated by spark plasma sintering (SPS). Ultrasonic treatment with organic solvent (DMAc) and dispersant (K2CO3) were used for the processes to make each CNT apart. Nano-order ceramic powders of zirconia (ZrO2) were found to be effective to keep uniform dispersion of CNT in Mg matrix. Low melting point metals such as Sn were added to fill voids and cracks in the composites. Post-SPS rolling was also employed aiming to improve the microstructures. The fabricated CNT-reinforced Mg composites were investigated on mechanical properties such as hardness and three-point bending strength to be related to the microstructures.

Fabrication of Bi-Te Based Thermoelectric Semiconductors by Using Hybrid Powders

2005 ◽  
Vol 297-300 ◽  
pp. 875-880
Author(s):  
Cheol Ho Lim ◽  
Ki Tae Kim ◽  
Yong Hwan Kim ◽  
Dong Choul Cho ◽  
Young Sup Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Crystals ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Bending Strength ◽  
Mixing Ratio ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
P Type

P-type Bi0.5Sb1.5Te3 compounds doped with 3wt% Te were fabricated by spark plasma sintering and their mechanical and thermoelectric properties were investigated. The sintered compounds with the bending strength of more than 50MPa and the figure-of-merit 2.9×10-3/K were obtained by controlling the mixing ratio of large powders (PL) and small powders (PS). Compared with the conventionally prepared single crystal thermoelectric materials, the bending strength was increased up to more than three times and the figure-of-merit Z was similar those of single crystals. It is expected that the mechanical properties could be improved by using hybrid powders without degradation of thermoelectric properties.

scholarly journals Mechanical Milling-Assisted Spark Plasma Sintering of Fine-Grained W-Ni-Mn Alloy

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1323 ◽  
Author(s):  
Yanlin Pan ◽  
Daoping Xiang ◽  
Ning Wang ◽  
Hui Li ◽  
Zhishuai Fan
Keyword(s):  
Spark Plasma Sintering ◽  
Mechanical Milling ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Interface Fracture ◽  
Composite Powders ◽  
Fine Grained ◽  
Plasma Sintering ◽  
Binding Phase ◽  
Spark Plasma

Fine-grained W-6Ni-4Mn alloys were fabricated by spark plasma sintering (SPS) using mechanical milling W, Ni and Mn composite powders. The relative density of W-6Ni-4Mn alloy increases from 71.56% to 99.60% when it is sintered at a low temperature range of 1000–1200 °C for 3 min. The spark plasma sintering process of the alloy can be divided into three stages, which clarify the densification process of powder compacts. As the sintering temperature increases, the average W grain size increases but remains at less than 7 µm and the distribution of the binding phase is uniform. Transmission electron microscopy (TEM) observation reveals that the W-6Ni-4Mn alloy consists of the tungsten phase and the γ-(Ni, Mn, W) binding phase. As the sintering temperature increases, the Rockwell hardness and bending strength of alloys initially increases and then decreases. The optimum comprehensive hardness and bending strength of the alloy are obtained at 1150 °C. The main fracture mode of the alloys is W/W interface fracture.

scholarly journals Physical, mechanical properties and wear resistance of iron-base matrix materials for sintered diamond tools fabricated by HP and SPS

Mechanik ◽  
2018 ◽  
Vol 91 (10) ◽  
pp. 846-849
Author(s):  
Elżbieta Bączek
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Metal Matrix ◽  
Physical And Mechanical Properties ◽  
Full Density ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Base Matrix ◽  
Spark Plasma ◽  
Sintered Diamond

Metal matrix composites were prepared by hot pressing (HP) and spark plasma sintering (SPS) techniques. Ball-milled ironbase powders were consolidated to near full density by these methods at 900°C. The physical and mechanical properties of the resulting composites were investigated. The specimens were tested for resistance to both 3-body and 2-body abrasion. The composites obtained by HP method (at 900°C/35 MPa) had higher density, hardness and resistance to abrasion than those obtained by SPS method.

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