Microstructure and fracture strength of silicon nitride ceramics consolidated by oscillatory pressure sintering

Li, Shuang; Wei, Chuncheng; Zhou, Lijuan; Wang, Peng; Wang, Weiwei

doi:10.1016/j.ceramint.2019.05.079

Cited by 20 publications

(4 citation statements)

References 30 publications

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“…The results demonstrate that TiN-reinforced ceramics based on SIALON exhibit the highest density (Table 1, samples 12-17) and low porosity. Conversely, TiN-reinforced ce-ramics based on Si 3 N 4 , prepared without a sintering additive, displayed the lowest density (Table 1, samples [18][19]. However, the introduction of Y 2 O 3 as a sintering additive to these Si3N4 powders significantly reduced their porosity (Table 1, samples 2-5).…”

Section: Density Hardness and Fracture Toughness Measurementsmentioning

confidence: 99%

“…A coarse structure, as a rule, results from the accelerated diffusion of atoms in the liquid phase at high temperatures. [19]. A variety of combinations of additives and their appropriate amounts in preparing Si 3 N 4 ceramics based on nanopowders are essential for attaining full densification and achieving their high-performance properties [5,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

Sartinska

2023

Powders

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The effect of induction heating on the surface properties of hot-pressed ceramics based on plasma chemical nanopowders Si3N4 and TiN (additives: Al2O3, AlN, and Y2O3) has been studied. The research demonstrates the formation of a modified layer on the surface of the hot-pressed material. The study examines the porosity, hardness, fracture toughness, brittleness, distribution of elements, and wear of hot-pressed ceramics on the surface before and after additional grinding. Removal of the surface porous layer results in increased density and hardness, leading to a higher number of acoustic emission signals during scratching with a Vickers indenter. A different response to scratching indicates a transgranular or intergranular fracture of the structure. The presence of porosity and carbon contamination on the surface layer of materials negatively impacts the properties of TiN-reinforced ceramics based on Si3N4-Al2O3-AlN (SIALON). However, the addition of Y2O3 effectively prevents carbon penetration and reduces the effect of grinding. Additionally, the dark-colored tone observed on the outer volume of the samples suggests a non-thermal microwave effect of the induction furnace.

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Section: Density Hardness and Fracture Toughness Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

Sartinska

2023

Powders

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“…Recently, a unique sintering technology-hot oscillatory pressing (HOP, or oscillatory pressure sintering)-was developed [15], which uses oscillatory pressure to replace constant pressure in traditional hot pressing (HP). HOP was applied to many ceramic materials such as WC [16], zirconia [17], alumina [18], silicon nitride [19], aluminum nitride [20], and high entropy ceramic [21], as well as refractory alloy [22] and cemented carbide [23,24]. HOP can enhance densification, inhibit grain growth, and improve mechanical properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

Hot Oscillatory Pressing of Carbon Nanotube-Reinforced Copper Matrix Nanocomposite

Han

Ding

et al. 2021

Nanomaterials

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Carbon nanotube reinforced copper matrix nanocomposites have great potential in machinery, microelectronics, and other applications. The materials are usually prepared by powder metallurgy processes, in which consolidation is a key step for high performance. To improve the density and mechanical properties, the authors explored the use of hot oscillatory pressing (HOP) to prepare this material. A carbon nanotube reinforced copper matrix nanocomposite was synthesized by both HOP and hot pressing (HP) at various temperatures, respectively. The samples prepared by HOP exhibited significantly higher density and hardness than those prepared by HP at the same temperature, and this was because the oscillatory pressure of HOP produced remarkable plastic deformation in copper matrix during sintering. With the decrease of sintering temperature in HOP, the amount of deformation defect increased gradually, playing a key role in the increasing hardness. This work proves experimentally for the first time that HOP can produce much more plastic deformation than HP to promote densification, and that HOP could be a very promising technique for preparing high-performance carbon nanotube reinforced copper matrix nanocomposites.

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“…The sinter-ing additives for Si 3 N 4 ceramics include Y 2 O 3 , Al 2 O 3 , MgO, AlN, La 2 O 3 , etc. In order to decrease the formation temperature of liquid phase and tailor the chemical composition of grain boundary phase, binary or multiple sintering additive systems are commonly used [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size of Y2O3-Al2O3 additives on microstructure and mechanical properties of Si3N4 ceramic balls for bearing applications

Zhang

Wang²,

Sun

et al. 2021

PAC

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Si3N4 ceramic balls were prepared by gas pressure sintering with Y2O3 and Al2O3 as sintering additives. The effects of particle size of Y2O3-Al2O3 additives on densification, microstructure and mechanical properties of Si3N4 ceramic balls were investigated. The reliability of Si3N4 ceramic balls was evaluated through the Weibull modulus. The results showed that Si3N4 ceramic balls containing nanosized Y2O3-Al2O3 additives have a higher relative density and better comprehensivemechanical properties compared with the samples containing microsized additives, with relative density of 98.9 ? 0.2%TD, Vickers hardness of 14.7 ? 0.1GPa, indentation fracture toughness of 6.5 ? 0.1MPa?m1/2 and crushing strength of 254 ? 8.5MPa. The more homogeneous and extensive dispersion of the nanosized sintering additives in the Si3N4 matrix is the main reason for the enhancement in density and mechanical properties of the Si3N4 ceramic balls.

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Microstructure and fracture strength of silicon nitride ceramics consolidated by oscillatory pressure sintering

Cited by 20 publications

References 30 publications

Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

Effect of Induction Heating on Surface Properties of Hot-Pressed Ceramics Based on Nanopowders Si3N4 and TiN

Hot Oscillatory Pressing of Carbon Nanotube-Reinforced Copper Matrix Nanocomposite

Effect of particle size of Y2O3-Al2O3 additives on microstructure and mechanical properties of Si3N4 ceramic balls for bearing applications

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