The effect of residual stress on whisker reinforcements in SiCw-Al2O3 composites during cooling

Wu, Weiwei; Gui, Jingya; Zhu, Tianbin; Xie, Zhipeng

doi:10.1016/j.jallcom.2017.07.192

Cited by 9 publications

(9 citation statements)

References 34 publications

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“…It is deposited on the surrounding grains, so that the grains grow irregularly, which leads to an adverse effect on the performance of the cemented carbide. 25 ( Figure 6 shows the XRD diffraction analysis patterns of cemented carbides with different SiCw contents. From this figure, it can be seen that the observed peaks are both WC hard phase and Co binder phase, while no peaks of SiCw are detected.…”

Section: Resultsmentioning

confidence: 99%

“…The SiCw is regarded as an impurity rather than toughening and reinforcing phase, which results in poor wettability of the Co liquid phase, reduces the surface activity of WC, affects the distribution of WC particles and causes some of the active WC grains to dissolve and continuously precipitated from the liquid phase. It is deposited on the surrounding grains, so that the grains grow irregularly, which leads to an adverse effect on the performance of the cemented carbide 25 …”

Section: Resultsmentioning

confidence: 99%

“…It can be seen that the cracks for regenerated WC‐8‐wt% Co cemented carbide containing 0.5‐wt% SiCw are narrow and short and have a tortuous deflection path. The crack bridging and micro crack branches near the main crack also consume a lot of fracture energy and lead to enhanced fracture toughness of the alloy 40,41 . However, as the content of SiCw further increases, the uneven dispersion effect of SiCw becomes worse, and agglomeration occurs, resulting in the alloy being unable to transfer from the matrix to the whisker when the external load is applied, which has an adverse effect on the propagation of cracks, resulting in the fracture toughness of cemented carbide decreases.…”

Section: Resultsmentioning

confidence: 99%

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Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering

et al. 2021

Int J Applied Ceramic Tech

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Cemented carbide, as an important industrial material, is well-known as "industrial teeth" due to its high hardness, strength, wear resistance, and other fantastic properties, which plays an important role in the fields of petroleum machinery, mining machinery, and mechanical processing. [1][2][3] However, there is a shortage of tungsten (W) and cobalt (Co) resources, which are main raw materials for cemented carbide. Therefore, recycling waste-cemented carbide to prepare regenerated cemented carbide raw materials is of great significance. In general, the hardness and toughness of cemented carbides are a pair of contradictions that are difficult to balance. Hence, it is particularly important to explore highperformance cemented carbide. 4 At present, several effective methods about toughening and strengthening are applied to improve the performance of regenerated cemented carbides based on characterizes and performances of the matrix and the reinforcing materials. The main toughening mechanisms of cemented carbide are whisker toughening, particle toughening, phase transformation toughening, microcrack toughening and layered structure toughening, etc. [5][6][7]

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering

et al. 2021

Int J Applied Ceramic Tech

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“…However, it can be seen that the fracture toughness of sample A increased with the increase of the crack size. Herein, the toughness of the composites can be divided into three parts using the following equation [20,21] Where is fracture toughness of the Al 2 O 3 matrix, is the contribution from the ZrO 2 , and is the contribution from the LaAl 11 O 18 platelets. As can be seen in XRD, only a little m-ZrO 2 exist in sample B, C, and D. The intensity of m-ZrO 2 phase is higher than that in B, C and D while the fracture toughness of Sample A is higher than the other four, which illustrate the effect of phase transformation toughen mechanism is small for Sample A.…”

Section: Resultsmentioning

confidence: 99%

R-curve of La2O3 doped Zirconia Toughened Alumina Composites Prepared via Stereolithography based 3D Printing

Wu¹,

Liu²,

Huang³

et al. 2020

Preprint

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In this study, we combined liquid precursor infiltration of high introduction amounts of bi-additives (20wt%) and stereolithography-based 3D printing to fabricate zirconia toughened alumina, and the infiltration systems consist of the four following systems Zr4+/La3+, Zr4+/Er3+, Zr4+/Gd3+, and Zr4+/Ce4+. The sample immersed with Zr4+/La3+ shows intense peaks of m-ZrO2 phase compared to the other samples while a new phase of flake-like LaAl11O18 occurs in the Zr4+/La3+ immersed sample, the existence of which could be confirmed by XRD and EDS. The fracture toughness of the Zr4+/Er3+, Zr4+/Gd3+, and Zr4+/Ce4+ samples remained basically unchanged versus the crack size, while the measured fracture toughness values for the Zr4+/La3+ system could be fitted as a rising R-curve behavior with the steady-state fracture toughness of 17.76 MPa·m1/2. The enormous enhancement of the toughness could be attributed to thermal expansion misfit and flake-like LaAl11O18 in the Zr4+/La3+ system. The effect of residual stresses on the fracture mode and thus the toughness is discussed on the basis of theoretical calculation and analysis. It is the first time a rising R-curve behavior is observed in the 3D printed ceramics. The shocking discovery provides a highly effective toughening way in 3D printing combined infiltration approach.

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“…Whisker aggregation leads to poor wettability of the bonding phase and larger grain size. 18 To further explore the influence of SiCw on Mo 2 NiB 2based cermets, the density of the Mo 2 NiB 2 -based cermets was measured, and the relative density was calculated, as shown in Figure 6. When the SiCw content was less than 0.5%, the relative density of the cermets decreased slightly from 96.74% to 96.55%.…”

Section: Microstructurementioning

confidence: 99%

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Zhang

et al. 2021

Int J Applied Ceramic Tech

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Mo2NiB2 is a kind of cermet with excellent mechanical properties, stable chemical properties, and excellent corrosion resistance and is often used in wear‐resistant application fields, such as injection molding machine parts, can making tools and hot copper extruding dies. The brittleness of Mo2NiB2‐based cermets limits their wide application. Mo2NiB2‐based cermets were prepared by the vacuum sintering method, the effect of SiC whiskers (SiCw) on the microstructure and mechanical properties of cermets was investigated, and the toughening mechanism of SiCw on cermets was further discussed. The results indicate that with increasing SiCw content, the indentation fracture toughness (KIC), transverse fracture strength (TRS), and Vickers hardness (HV) of the cermets first increase and then decrease. The HV, TRS, and indentation fracture toughness of Mo2NiB2‐based cermets with 0.5 wt% SiCw are 1 113 HV, 1 620 MPa, and 27.97 MPa·m1/2, respectively, which are 16.8%, 22.7%, and 25% higher than those without SiCw. In the sliding friction tests, Mo2NiB2‐based cermets with 0.5 wt% SiCw have the smallest friction coefficient, low wear rate, and high wear resistance. SEM observation and analysis of the crack path and fracture surface showed that the toughening mechanism is whisker bridging, crack deflection, microcrack toughening, and whisker pull‐out. The results indicate that the addition of 0.5 wt% SiCw can effectively improve the mechanical properties of Mo2NiB2‐based cermets and further expand the application space of Mo2NiB2‐based cermets.

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The effect of residual stress on whisker reinforcements in SiCw-Al2O3 composites during cooling

Cited by 9 publications

References 34 publications

Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering

Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering

R-curve of La2O3 doped Zirconia Toughened Alumina Composites Prepared via Stereolithography based 3D Printing

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

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The effect of residual stress on whisker reinforcements in SiCw-Al2O3 composites during cooling

Cited by 9 publications

References 34 publications

Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering

Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering

R-curve of La2O3 doped Zirconia Toughened Alumina Composites Prepared via Stereolithography based 3D Printing

Preparation and toughening mechanism of Mo2NiB2‐based cermets with SiC whiskers

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Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers