Incorporation of the transition metals (Cr and Fe) into β-SiAlON crystal structure

Yurdakul, Hilmi; Turan, Servet

doi:10.1016/j.ceramint.2011.01.009

Cited by 15 publications

(9 citation statements)

References 20 publications

(30 reference statements)

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“…In accordance with the XRD plane index (0 0 0 1) and the plane spacing (1 0 −1 0), Sialon growing along the [0 0 0 1] face and TiB 2 growing along the [1 0 −1 0] face are speculated to exist [dataset]. The electron diffraction (SAED) of the selected region recorded from ① (Figure 5B) examines that the Sialon orientation is parallel to the axis of the [0 0 0 1] low‐index region, and this SAED pattern is in full agreement with the simulated kinematic SAED pattern obtained with the Sialon phase along the axis of the [0 0 0 1] low‐index region 23 …”

Section: Resultssupporting

confidence: 66%

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In situ synthesis of PcBN composites from Sialon–TiN–TiB₂ binder and cBN under high temperature and pressure

Zhong

Geng

et al. 2023

Int J Applied Ceramic Tech

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Polycrystalline cubic boron nitride (PcBN) composites were synthesized in situ with TiB2, TiN, and Sialon as binders under ultrahigh temperature (1550°C) and high pressure (5.5 GPa). X‐ray diffractometry, universal testing machine, field emission scanning electron microscopy, and transmission electron microscopy were used to study the effect of Sialon content (0%, 20%, 40%, 60%, and 80% by mass of binder) on the phase composition, microstructure, and mechanical properties of PcBN composites. The results show that the main phases in the system are lamellar TiN, needle‐rodlike TiB2, and irregular long‐rodlike Sialon. Some TiB2 grows along the (1 0 −1 0) face, and Sialon grows along the (0 0 0 1) face. The density and mechanical properties of the sintered product are significantly improved due to the formation of Sialon. When the content of Sialon is 60%, the binder is uniformly distributed, the cBN interface is well bonded, and the density is the highest. At this time, the strength reaches the maximum 34.57 GPa, the fracture toughness is 6.82 MPa m1/2, and the flexural strength reaches the maximum 870.79 MPa. On the whole, cBN composites have excellent prospects for future applications in cutting inserts due to their excellent mechanical properties.

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Section: Resultssupporting

confidence: 66%

“…5B) examines that the Sialon orientation is parallel to the axis of the [0 0 0 1] low-index region, and this SAED pattern is in full agreement with the simulated kinematic SAED pattern obtained with the Sialon phase along the axis of the [0 0 0 1] low-index region. 23…”

Section: Analysis Of Xrd and Tem Resultsmentioning

confidence: 99%

In situ synthesis of PcBN composites from Sialon–TiN–TiB₂ binder and cBN under high temperature and pressure

Zhong

Geng

et al. 2023

Int J Applied Ceramic Tech

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“…5 are consistent with the HRTEM images, experimental and simulated diffraction patterns obtained from the b-SiAlON phase along the [0001] low index zone axis in previous studies. 55,56 Additionally, an amorphous surface layer with only a few nanometre thicknesses on b-SiAlON grain could be seen. This further implies that the process parameters, i.e.…”

Section: Resultsmentioning

confidence: 98%

A novel approach on the synthesis of β-SiAlON:Eu²⁺phosphors from kaolin through carbothermal reduction and nitridation (CRN) route

Yurdakul

Ceylantekin

Turan

2014

Advances in Applied Ceramics

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Doping β-SiAlON crystal structure with rare earths leads to a superior tuneable luminescence properties for light emitting diodes (LEDs). However, the widely used conventional methods require high purity starting powders and time consuming processes. Here, a new approach to synthesise Eu2+ activated β-SiAlON phosphors from kaolin through carbothermal reduction and nitridation route was introduced. The Rietveld refinement on powder X-ray diffraction method and scanning electron microscopy with energy dispersive X-ray spectroscopy analyses showed that 78·28 wt-%Eu2+ doped β-Si6−zAlzOzN8−z (z = 2·1) was successfully obtained. Photoluminescence examinations under the 267 nm excitation revealed two distinct broad emission peaks: maxima at around 415 nm (violet) and 540 nm (green). Transmission electron microscopy observations demonstrated the incorporation of Eu2+ ions into β-SiAlON grains giving the observed violet and green emissions. It is anticipated that this study paves a way for cost effective synthesis of rare earth doped single phase β-SiAlON phosphors in LED applications.

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“…[6][7][8][9] However, the boring gray color cannot satisfy consumers' pursuit for colorful appearance of back plate. According to considerable research results, [10][11][12][13][14][15][16] Si 3 N 4 could react sensitively with many metals (Co, Cr, Mo, etc.) and some metallic oxides (MoO 3 , Fe 2 O 3 , etc.…”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of cobalt silicide particle reinforcing and coloring Si₃N₄ ceramics

Liu

Duan

et al. 2021

Int J Applied Ceramic Tech

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In this paper, silicon nitride (Si3N4) ceramics with black color and high toughness were fabricated by gas pressure sintering and characterized by X‐ray diffraction, Raman, scanning electron microscopy, EDS, and transmission electron microscopy. The in situ formed cobalt silicide was confirmed to contribute to the black color through the introduction of CoO. Due to the addition of CoO, the growth of β‐Si3N4 grains is promoted, forming elongated grains, and eventually forms the self‐reinforcing microstructure. However, with adding excessive CoO, interfacial debonding is found between cobalt silicide and Si3N4 matrix and a decrease in strength was resulted. The optimum composition is 1 mol% CoO in Si3N4, with the fracture toughness of 9.9 ± 0.3 MPa m1/2, flexural strength of 826.1 ± 46.0 MPa, and a much darker black color. The mechanism of color formation is discussed where the black color derives mainly from the metallic silicon and additionally the porosity.

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Incorporation of the transition metals (Cr and Fe) into β-SiAlON crystal structure

Cited by 15 publications

References 20 publications

In situ synthesis of PcBN composites from Sialon–TiN–TiB₂ binder and cBN under high temperature and pressure

In situ synthesis of PcBN composites from Sialon–TiN–TiB₂ binder and cBN under high temperature and pressure

A novel approach on the synthesis of β-SiAlON:Eu²⁺phosphors from kaolin through carbothermal reduction and nitridation (CRN) route

In situ synthesis of cobalt silicide particle reinforcing and coloring Si₃N₄ ceramics

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Incorporation of the transition metals (Cr and Fe) into β-SiAlON crystal structure

Cited by 15 publications

References 20 publications

In situ synthesis of PcBN composites from Sialon–TiN–TiB2 binder and cBN under high temperature and pressure

In situ synthesis of PcBN composites from Sialon–TiN–TiB2 binder and cBN under high temperature and pressure

A novel approach on the synthesis of β-SiAlON:Eu2+phosphors from kaolin through carbothermal reduction and nitridation (CRN) route

In situ synthesis of cobalt silicide particle reinforcing and coloring Si3N4 ceramics

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Resources

About

In situ synthesis of PcBN composites from Sialon–TiN–TiB₂ binder and cBN under high temperature and pressure

In situ synthesis of PcBN composites from Sialon–TiN–TiB₂ binder and cBN under high temperature and pressure

A novel approach on the synthesis of β-SiAlON:Eu²⁺phosphors from kaolin through carbothermal reduction and nitridation (CRN) route

In situ synthesis of cobalt silicide particle reinforcing and coloring Si₃N₄ ceramics