Effects of the electric current on conductive Si3N4/TiN composites in spark plasma sintering

Zhou, Manyuan; Rodrigo, Don; Cheng, Yi‐Bing

doi:10.1016/j.jallcom.2012.08.091

Cited by 21 publications

(8 citation statements)

References 20 publications

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“…32 On the other hand, there are the other possibilities for pulse current flowing through insulating phases like Si 3 N 4 or pore, owing to the lower electrical resistivity of constituents at their sintering temperature, as indicated by Zhou in the system of Si 3 N 4 /TiN composite. 33…”

Section: Resultsmentioning

confidence: 99%

Probing the Conductance and Microstructure Heterogeneity of Si₃N₄/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

Lee

Liu

2013

J. Am. Ceram. Soc.

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This study presents the results of atomic force microscopy (AFM)‐localized impedance measurements within Si3N4/glassy phase/TiC heterogeneous nanostructures. The three phases show significant differences in the charge‐transfer resistance and interface capacitance values detected on the plasma‐etching surface by an ultrasharp AFM, and these characteristics are helpful to understand the sintering behavior in spark plasma sintering. The effect of an electrical field may induce localized Joule heating on conductive nano‐TiC embedded in the Si3N4‐based matrix. The glassy phase doped with Ti and C, as observed by transmission electron microscopy, may promote electrowetting, leading to enhanced densification in the insulating/conductive ceramic nanocomposite system.

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Section: Resultsmentioning

confidence: 99%

Probing the Conductance and Microstructure Heterogeneity of Si₃N₄/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

Lee

Liu

2013

J. Am. Ceram. Soc.

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“…One can see that all the pressureless SPS samples show high relative densities around 98% and slightly higher with the introduction of the conductive TiC 0.3 N 0.7 phase. The conductive TiC 0.3 N 0.7 phase uniformly distributed in the β-SiAlON matrix increases the electrical conductivity of the composite materials and consequently affects their sintering behavior by the electric current passing through the sample in SPS [26]. As the result, it promotes the sample sintering at relatively lower temperatures, and thus leads to obtain the higher density, hardness and fracture toughness as well as the complete phase transformation of α-Si 3 N 4 to β-SiAlON.…”

Section: Density Hardness and Fracture Toughnessmentioning

confidence: 99%

High mechanical properties ofβ-SiAlON/TiC_0.3N_0.7ceramic composite prepared by pressureless spark plasma sintering

Chen

Lan

et al. 2021

Journal of Asian Ceramic Societies

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β-SiAlON/TiC 0.3 N 0.7 composites containing 2.0-7.5 wt.% TiC 0.3 N 0.7 are prepared by pressureless spark plasma sintering (SPS) with Al 2 O 3 -AlN-Y 2 O 3 additives. The TiC 0.3 N 0.7 phase particles are homogeneously dispersed in the β-SiAlON matrix. The reaction between the sample and the graphite mold can be avoided during the pressureless SPS. The β-SiAlON/TiC 0.3 N 0.7 composite with 5 wt.% TiC 0.3 N 0.7 , fabricated at 1550°C, exhibits a high density of 3.28 g cm −3 (98% relative density), high Vickers hardness of 14.53 GPa, and high fracture toughness of 7.20 MPa m 1/2 . By further SPS under a pressure of 24 MPa at 1400 o C, these properties are enhanced to a higher density of 3.32 g cm −3 (full density), higher Vickers hardness of 15.87 GPa, and higher fracture toughness of 7.44 MPa m 1/2 . Obviously, the fracture toughness of the as-prepared β-SiAlON/TiC 0.3 N 0.7 composites is apparently higher than those of the reported β-SiAlON-based ceramic composites prepared by pressurized SPS, which is mainly attributed to the highly dense microstructures of the interlocking lath β-SiAlON grains and the uniformly distributed TiC 0.3 N 0.7 particles, and the disappearance of the oriented ununiform stress caused by uniaxial pressure in normal pressurized SPS. Accordingly, the pressureless SPS could be a potential technique for the fabrication of high-performance β-SiAlON matrix composites.

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“…Pulse DC sintering system (PDCS) is a method which enables the production of different material types by using mechanical load and electric current to strengthen the interparticle bonding and to intensify bonding [1][2][3][4][5][6][7][8][9][10]. Prediction of process time of sample production is an important PDCS parameter [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Darbeli DC Sinterleme Sistemi Konteynerinin Soğumasına Yönelik Termal Devre Modeli

Yener¹,

Yener²,

Mutlu³

2019

Academic Platform Journal of Engineering and Science

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Pulse DC Sintering System (PDCS) is a cheap and quick way of producing different types of materials. After sintering of the sample, the cooling of the PDCS container is needed before taking it out. The sample production time is the sum of the sintering and the cooling time. Therefore, estimation of the sample cooling time must be made accurately to model sample production. Its container dimensions and the material, it is made of, determines its temperature during cooling. In this paper, a thermal circuit which models a pulse DC sintering system container during cooling is given. Its thermal circuit model is made assuming that some heat leaks from the steel container to the cooper bars, the copper bars and the container all have natural convection and also radiate heat to cool down. The thermal model is described with a set of nonlinear state-space equations. The state-space equations are solved numerically using Runge-Kutta 4 method. The time required to make the sample cool down to ambient temperature is calculated using simulations. The temperatures of the container and the copper bars of an PDCS system are measured to find the experimental cooling time. The results are compared. The PDCS thermal model is able to verify the experimental results. It has also been experimentally shown that the cooling time is not dependent on the sample type produced for the examined PDCS system. Such a model can be easily implemented in an engineering software which aims to model the sample production process of the PDCS system and can also be used for its optimization considering its physical parameters such as dimensions, electrical and mechanical constants etc. ÖzDarbe DC Sinterleme (PDCS), darbe genlik modülasyonlu doğru akım kullanarak farklı tipte malzemelerin ucuz ve hızlı biçimde üretilmesini sağlayan bir yöntemdir. Bu yöntemde numunenin sinterlenmesinden sonra, PDCS konteynerinin soğuması gerekir. Toplam üretim süresi sinterleme ve soğuma süresinin toplamıdır. Bu nedenle, numune üretim zamanını modellemek için numune soğuma süresinin belirlenmesi gereklidir. Kalıp boyutları ve üretilen malzeme, soğuma sırasındaki sıcaklığı belirler. Bu çalışmada, soğuma sırasındaki elektrik akım destekli sinterleme sistemi konteynerini modelleyen bir termal devre sunulmuştur. Isı devresi modeli, çelik konteynerden bakır baralara ısı transferi olduğu; bakır baralar ve konteynerin soğuma için doğal taşınıma sahip yayınım ile ısı yaydığı yaptığı kabulüyle oluşturulmuştur. Termal model, doğrusal olmayan durum-uzay denklemleri ile tanımlanmış ve denklemler numerik olarak Runge-Kutta 4 metodu kullanılarak çözülmüştür. Numunenin ortam sıcaklığına kadar soğuması için gereken süre simülasyonlar kullanılarak hesaplanmıştır. Elde edilen sonuçlar, konteyner ve bakır bara sıcaklıkları

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Effects of the electric current on conductive Si3N4/TiN composites in spark plasma sintering

Cited by 21 publications

References 20 publications

Probing the Conductance and Microstructure Heterogeneity of Si₃N₄/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

Probing the Conductance and Microstructure Heterogeneity of Si₃N₄/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

High mechanical properties ofβ-SiAlON/TiC_0.3N_0.7ceramic composite prepared by pressureless spark plasma sintering

Darbeli DC Sinterleme Sistemi Konteynerinin Soğumasına Yönelik Termal Devre Modeli

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Effects of the electric current on conductive Si3N4/TiN composites in spark plasma sintering

Cited by 21 publications

References 20 publications

Probing the Conductance and Microstructure Heterogeneity of Si3N4/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

Probing the Conductance and Microstructure Heterogeneity of Si3N4/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

High mechanical properties ofβ-SiAlON/TiC0.3N0.7ceramic composite prepared by pressureless spark plasma sintering

Darbeli DC Sinterleme Sistemi Konteynerinin Soğumasına Yönelik Termal Devre Modeli

Contact Info

Product

Resources

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Probing the Conductance and Microstructure Heterogeneity of Si₃N₄/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

Probing the Conductance and Microstructure Heterogeneity of Si₃N₄/TiC‐Based Nanocomposite at the Nanoscale by Scanning Impedance Microscopy

High mechanical properties ofβ-SiAlON/TiC_0.3N_0.7ceramic composite prepared by pressureless spark plasma sintering