scholarly journals SPS sintering of nitride ceramics

Mechanik ◽  
2019 ◽  
Vol 92 (5-6) ◽  
pp. 366-370
Author(s):  
Piotr Wyżga ◽  
Piotr Klimczyk ◽  
Jolanta Cyboroń ◽  
Paweł Figiel
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Physical And Mechanical Properties ◽  
Initial Mixture ◽  
Fast Method ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Field Assisted Sintering

Due to the unique properties of ceramics materials based on nitride, it could be used in the broadly understood technique. However, obtaining silicon nitride materials requires it to use the advanced methods of manufacturing, mostly because this material is difficult to sinter. Dense ceramic sinters were obtained from the system Si3N4-Al2O3-Y2O3 by applied pulsed current – SPS/FAST method (spark plasma sintering/field assisted sintering technique). The sintering parameters of the initial mixture were optimized to obtain the highest possible sinter properties, such as: density, Young’s modulus, hardness and fracture toughness. In the presented work the influence of pressure and pulse current, used in the SPS/FAST method, on sinterability and on selected physical and mechanical properties of the obtained materials was analyzed. The purpose of introducing the Al2O3 and Y2O3 additions to the Si3N4 matrix was to activate the hard-to-sinter silicon nitride powder and consequently to achieve a high density of the sintered samples. The best properties were characterized by sinter obtained in 1700°C and under pressure 63 MPa; the holding time at sintering temperature was 15 min. The density of the obtained sample has reached 98% theoretical value, and the other parameters were: Young’s modulus – 298 GPa, Vickers hardness – 17,7 GPa, fracture toughness – 6 MPa∙m1/2.

Densification, Microstructure, and Behavior of Hydroxyapatite Ceramics Sintered by Using Spark Plasma Sintering

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Shufeng Li ◽  
Hiroshi Izui ◽  
Michiharu Okano
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Relative Density ◽  
Young’S Modulus ◽  
Spark Plasma Sintering ◽  
Young's Modulus ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Temperature And Pressure

This paper discusses the dependence of the mechanical properties and microstructure of sintered hydroxyapatite (HA) on the sintering temperature and pressure. A set of specimens was prepared from as-received HA powder and sintered by using a spark plasma sintering (SPS) process. The sintering pressures were set at 22.3MPa, 44.6MPa, and 66.9MPa, and sintering was performed in the temperature range from 800°Cto1000°C at each pressure. Mechanisms underlying the interrelated temperature-mechanical and pressure-mechanical properties of dense HA were investigated. The effects of temperature and pressure on the flexural strength, Young’s modulus, fracture toughness, relative density, activation energy, phase stability, and microstructure were assessed. The relative density and grain size increased with an increase in the temperature. The flexural strength and Young’s modulus increased with an increase in the temperature, giving maximum values of 131.5MPa and 75.6GPa, respectively, at a critical temperature of 950°C and 44.6MPa, and the fracture toughness was 1.4MPam1∕2 at 1000°C at 44.6MPa. Increasing the sintering pressure led to acceleration of the densification of HA.

Fabrication of Titanium / Biodegradable-Polymer FGM for Medical Application

2009 ◽  
Vol 631-632 ◽  
pp. 199-204 ◽  
Author(s):  
Yoshimi Watanabe ◽  
Yoshimi Iwasa ◽  
Hisashi Sato ◽  
Akira Teramoto ◽  
Koji Abe
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Medical Application ◽  
Hot Water ◽  
Porous Ti ◽  
Ti Alloys ◽  
Plasma Sintering ◽  
Biodegradable Poly ◽  
Spark Plasma

Ti and Ti alloys are widely used as metallic implants, because of their good mechanical properties and nontoxic behavior. However, they have problems as the implant-materials, namely, high Young’s modulus comparing that of bone and low bonding ability with bone. There is a need to develop the Ti and Ti alloys with lower Young’s modulus and good bonding ability. In previous study, Ti composite containing biodegradable poly-L-lactic-acid (PLLA) fiber has been fabricated to improve these problems. However, this composite has low strength because of the imperfect sintering of Ti matrix. To improve its strength, sintering of Ti matrix should be completed. In this study, Ti-NaCl composite material was fabricated by spark plasma sintering (SPS) method using powder mixture of Ti and NaCl to complete the sintering of Ti matrix. To obtain porous Ti samples, Ti-NaCl composite were put into hot water of 100 oC. The porous Ti was dipped into PLLA melt in order to introduce PLLA into the pores of porous Ti. Finally, Ti-PLLA composite was obtained, and PLLA plays a role as reinforcement of Ti matrix. It was found that the Ti-PLLA composite has gradient structure and mechanical properties.

Influence of B4C, SiC and Si3N4 Additions on Microstructures and Selected Properties of Titanium Nitride Matrix Materials Obtained by HPHT Method

2014 ◽  
Vol 89 ◽  
pp. 109-114
Author(s):  
Jolanta Cyboroń ◽  
Piotr Klimczyk ◽  
Pawel Figiel ◽  
Małgorzata Karolus
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
Phase Composition ◽  
High Temperature ◽  
Titanium Nitride ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Physical And Mechanical Properties ◽  
Ceramic Phase ◽  
Ultra High Temperature Ceramics

The paper presents the results of the High Pressure and High Temperature (HP-HT) sintering and investigation of Ultra High Temperature Ceramics (UHTC) composites of titanium nitride matrix. The aim of this studies were to determine the influence of additives on the ceramic phase composition, microstructure and selected properties. Three different kind of mixtures were prepared. 8 to 22 wt% B4C, SiC and Si3N4were added. Composites were sintered under high-pressure high-temperature conditions (HP-HT) using a Bridgman-type apparatus under pressure about 6 GPa. Materials were sintered at the range of 1450 to 1690 ° C, duration of sintering was 60s. The phase composition, microstructure, and the apparent density, Young's modulus, hardness and fracture toughness KIC (HV), using the Vickers indentation method were examined. Sintered titanium nitride with the 22 wt% silicon carbide participation was characterized the best physical and mechanical properties. For this material the relative density is 99%, the Young's modulus 435 GPa, Vickers hardness 18.3 GPa HV1 and fracture toughness 5.5 MPa∙m1/2.

Mechanical Properties of Transparent Polycrystalline Silicon Nitride

2006 ◽  
Vol 317-318 ◽  
pp. 305-308 ◽  
Author(s):  
Rak Joo Sung ◽  
Takafumi Kusunose ◽  
Tadachika Nakayama ◽  
Yoon Ho Kim ◽  
Tohru Sekino ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Nitride ◽  
Young’S Modulus ◽  
Fracture Strength ◽  
Polycrystalline Silicon ◽  
Volume Fraction ◽  
Young's Modulus ◽  
Β Phase ◽  
Α Phase

A novel transparent polycrystalline silicon nitride was fabricated by hot-press sintering with MgO and AlN as additives. The mixed powder with 3 wt.% MgO and 9 wt.% AlN was sintered at 1900oC for 1 hour under 30 MPa pressure in a nitrogen gas atmosphere. Transparent polycrystalline silicon nitride was successfully fabricated. The mechanical properties such as density, hardness, young’s modulus, fracture strength and fracture toughness were evaluated. The effect of α/β phase on the mechanical properties of transparent polycrystalline silicon nitride was investigated. The properties were changed depending on the amount of α/β phase. The hardness and Young's modulus increased with increasing the volume fraction of α-phase fraction as a reflection of the higher hardness of α-phase Si3N4. The fracture toughness and fracture strength decreased with decreasing the volume fraction of β-phase Si3N4.

scholarly journals Influence of MXene (Ti3C2) Phase Addition on the Microstructure and Mechanical Properties of Silicon Nitride Ceramics

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5221
Author(s):  
Jaroslaw Wozniak ◽  
Mateusz Petrus ◽  
Tomasz Cygan ◽  
Artur Lachowski ◽  
Bogusława Adamczyk-Cieślak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Phase Transformation ◽  
Silicon Nitride ◽  
Powder Processing ◽  
Sintering Process ◽  
Microstructure And Mechanical Properties ◽  
Plasma Sintering ◽  
Nitride Ceramics ◽  
Spark Plasma

This paper discusses the influence of Ti3C2 (MXene) addition on silicon nitride and its impact on the microstructure and mechanical properties of the latter. Composites were prepared through powder processing and sintered using the spark plasma sintering (SPS) technic. Relative density, hardness and fracture toughness, were analyzed. The highest fracture toughness at 5.3 MPa·m1/2 and the highest hardness at HV5 2217 were achieved for 0.7 and 2 wt.% Ti3C2, respectively. Moreover, the formation of the Si2N2O phase was observed as a result of both the MXene addition and the preservation of the α-Si3N4→β-Si3N4 phase transformation during the sintering process.

scholarly journals Spark plasma sintering of Si3N4/multilayer graphene composites

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Eszter Bódis ◽  
Orsolya Tapasztó ◽  
Zoltán Károly ◽  
Péter Fazekas ◽  
Szilvia Klébert ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Silicon Nitride ◽  
Spark Plasma Sintering ◽  
Multilayer Graphene ◽  
Plasma Sintering ◽  
Spark Plasma

AbstractMulitlayer graphene reinforced silicon nitride composites were prepared by spark plasma sintering to investigate the effect of the graphene addition on mechanical properties. The composites contained multilayer graphene (MLG) in various (0, 1, 3 and 5 wt%) content. Significantly higher fracture toughness of 8.0 MPa m

scholarly journals Influence of Freeze-Thaw Cycles on Engineering Properties of Tonalite: Examples from China

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Su-Ran Wang ◽  
You-Liang Chen ◽  
Jing Ni ◽  
Mu-Dan Zhang ◽  
Heng Zhang
Keyword(s):  
Fracture Toughness ◽  
Young’S Modulus ◽  
Minimum Temperature ◽  
Young's Modulus ◽  
Physical And Mechanical Properties ◽  
Frost Damage ◽  
Engineering Properties ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

The deterioration of the physical and mechanical properties of tonalites subjected to freeze-thaw cycling under three different temperature ranges was explored using several experimental techniques. Uniaxial compression and three-point bending tests were conducted on untreated and treated tonalite specimens. Clear decreases in uniaxial compressive strength (UCS), Young’s modulus, and fracture toughness were observed in tonalite specimens with frost damage. Although Young’s modulus and fracture toughness did not show clear decreases as the minimum temperature of the freeze-thaw cycle decreased from −30°C to −50°C, the UCS decreased almost linearly. The macromechanical characteristics of the tonalites can be explained by changes in mineral content and microstructure. The intensity of X-ray diffraction (XRD) peaks of minerals in tonalites that had not been freeze-thaw cycled were approximately 10 to 20 times higher than the peaks for the specimens subjected to freeze-thaw cycling, implying that the internal structure of tonalite is less compact after frost damage. The microstructures of the tonalite specimens were also examined using scanning electron microscopy (SEM). Increased amounts of fragmentation and breaking of structural planes were observed as the minimum temperature of the freeze-thaw cycle decreased.

Analysis of the Mechanisms of Cracking Selected Transition Metal Carbides

2015 ◽  
Vol 655 ◽  
pp. 62-67
Author(s):  
Pawel Figiel ◽  
Piotr Wyzga ◽  
Jolanta Laszkiewicz-Lukasik ◽  
Kamil Wojteczko ◽  
Marcin Podsiadlo
Keyword(s):  
Fracture Toughness ◽  
Physical And Mechanical Properties ◽  
Tantalum Carbide ◽  
Metal Carbides ◽  
Sintering Time ◽  
Plasma Sintering ◽  
Structural Applications ◽  
Cracking Mechanisms ◽  
Spark Plasma ◽  
Sintering Method

Fracture toughness is one of the basic properties that determine the usefulness of these materials for structural applications. In this work, an analysis of cracking mechanism and measuring the fracture toughness of selected carbides: NbC, TaC and ZrC were carried out. Tested materials were sintered using Spark Plasma Sintering method (SPS), at 2200 °C, under a pressure of 35 MPa. Sintering time was 5 and 30 min. Commercial powders were used, with a particle size in the range from 1 to 6 microns. The powders were sintered without the addition of sintering activators.Additionally selected physical and mechanical properties have been investigated: apparent density (Archimedes method), Young's modulus (ultrasonic) and hardness (Vickers). The cracking mechanisms analysis was carried out using Scanning Electron Microscopy (SEM). Studies have shown that the highest fracture toughness, about 5.35 MPa·m1/2, characterized tantalum carbide, sintered at 2200 °C for 5 min. TaC also had the highest resistance to the formation of chipping around the Vickers indentation.

scholarly journals Selected properties of ZrB₂ composites obtained by SPS method for parts of electro-erosion shaping machines

Mechanik ◽  
2018 ◽  
Vol 91 (2) ◽  
pp. 155-158
Author(s):  
Annamaria Naughton-Duszova ◽  
Elżbieta Bączek ◽  
Marcin Podsiadło
Keyword(s):  
Fracture Toughness ◽  
Ceramic Composites ◽  
Zirconium Boride ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Ultra High Temperature Ceramics ◽  
High Relative Density ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Field Assisted Sintering

The effect of the addition of silicon carbide and boron carbide powders on the properties of ZrB2 ceramic composites constituting UHTC materials (ultra high temperature ceramics) was investigated. Polycrystalline zirconium boride samples as well as matrix composites of this phase with addition of 2 and 10 wt.% SiC and B4C were obtained by pressure-assisted sintering using SPS/FAST (spark plasma sintering/field assisted sintering technique) in the temperature range of 1800÷2000°C. Samples were characterized by X-ray diffraction, scanning electron microscopy, hardness and fracture toughness. The obtained materials are characterized by a high relative density in the range of 97÷98%. Higher hardness and fracture toughness were observed for the composite obtained in temperature 1900°C.

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