Progress in Activated-synthesis of Si-based Oxynitrides Materials at Low Temperatures

doi:10.15541/jim20170401

Abstract

Abstract:

Si-based oxynitride is an important type of structure/function integrated materials and has got wide applications in the fields of wear resistance, corrosion resistance, high speed cutting, pressure sealing, phosphors host, alkaline catalysis, and so on. The preparation of Si-based oxynitrides powders has undergone different development stages: high temperature solid state reaction (SSR), self-propagating high temperature synthesis (SHS), carbothermal reduction and nitridation (CRN), wet-chemical route combined with CRN, and others, presenting a sustained development trend. In this paper, the research progress in the activated-synthesis of Si-based oxynitrides powders and fibers at low calcination temperatures is reviewed over the past ten years, mainly focusing on the carbothermal reduction nitridation at micro-nano scale based on mesoporous template assembly as well as SiC reduction assisted Sol-Gel nitridation method. The development trend and applications of the low temperature activated-synthesis of Si-based oxynitrides materials are also prospected.

Key words: Si-based oxynitrides, mesoporous template assembling, carbothermal reduction nitridation, SiC reductant, Sol-Gel, review

CLC Number:

LIU Qian, ZHOU Zhen-Zhen. Progress in Activated-synthesis of Si-based Oxynitrides
Materials at Low Temperatures[J]. Journal of Inorganic Materials, 2018, 33(2): 129-137.

Figures/Tables 11

Fig.1 Schematic processing of β-Sialon powder synthesis via a combination route of mesoporous hard template, nano-casting, and carbothermal reduction nitridation[19]

Table 1 Surface area, pore volume, and average pore size of samples[19]

Sample	Surface area, S_BET/(m²•g^-1)	Pore volume, V_BJH/(cm³•g^-1)	Average pore size, D_pore/nm
SBA-15 hard template	577.0	0.88	6.1
SBA-15/C/Al₂O₃composited precursor	359.0	0.23	2.6
β-Si₃Al₃O₃N₅product 1420℃/6 h (Z=3)	15.8	0.03	7.7

Fig. 2 SEM microscopic images of (a) SBA-15, (b) SBA-15/C/Al2O3 composite precursors and (c) resultant β-Si3Al3O3N5 product powders[19]

Fig. 3 Illustration of the reaction scheme of Y2SiO5 formation between Y2O3 and SBA-15[24]

Fig. 4 SEM images of (a) SBA-15 particle, (b) Si2N2O particle prepared using a SBA-15/C composite with 0.5mol% Y2O3 calcined at 1280℃/7 h, (c) mesoporous silica spheres (MMS), and (d) Si2N2O particle prepared using a MMS/C composite with 0.5mol% Y2O3 calcined at 1280℃/7 h[24]

Fig. 5 (a) Excitation spectra and (b) emission spectra of β-Sialon : xEu2+ (x=0.010’0.200, z=1.00) phosphor samples with various x values, synthesized at 1400℃(λex=265, 275 nm, λem=416, 525 nm)[38]

Fig. 6 PL emission spectra of as-synthesized β-Sialon : 0.05Eu2+ (z=1.00) phosphor sample synthesized at 1400℃, measured in an increasing temperature range from 25℃ to 275℃[38]

Fig. 7 XRD patterns of β-Sialon : Eu2+ fibers calcined at 1460℃, using sucrose and carbon powders as duplicate reducing agents[46]

Fig. 8 Morphology image of β-Sialon : Eu2+ fibers calcined at 1460℃, using sucrose and carbon powders as duplicate reducing agents[46]

Fig. 9 XRD patterns of Y5(1-x)Si3O12N : 5xEu2+ (x = 0.005~ 0.06) calcined at 1560℃ for 5 h[47]

Fig. 10 (a) Normalized emission spectra (λex=365 nm), (b) corresponding CIE coordinates and photographs under a UV (365 nm) light radiation of Y5(1-x)Si3O12N : 5xEu2+(x=0.003~0.06) phosphors[47]

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