Reaction sintering of fluorine-doped MgSiN2

“…In recent years, magnesium silicon nitride (MgSiN 2 ) has been attracted great interest due to the crystal structure is similar to aluminium nitride (AlN). Compared with AlN, MgSiN 2 is a simple covalent insulator, and shows more excellent mechanical properties than AlN ceramics [1] [2] [3]. MgSiN 2 has many attractive properties such as high thermal conductivity, low dielectric constant, high hardness, high thermal stability, good oxidation resistance (up to 920˚C) and high electrical resistance at room temperature [4] [5].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of MgSiN<sub>2</sub> Powder at Different Nitrogen Pressures

Zhou¹,

Zhang²,

Li³

et al. 2019

MSCE

View full text Add to dashboard Cite

MgSiN 2 powders have been synthesized by combustion synthesis (CS) using Mg and Si 3 N 4 as starting materials at different nitrogen pressures. The CSed powders were then sintered by spark plasma sintering (SPS) to obtain dense bulk MgSiN 2 product. Analysis of the CSed powder using X-ray diffraction (XRD) revealed single-phase MgSiN 2 was obtained by CS method. However, the CSed product can be divided into three distinct parts according to its color. Scanning electron microscopy (SEM) observation revealed the grain size and crystallinity decrease gradually from the center to the outer layer. Some small grains clustered together to form larger particles, and there were a large number of pores among the clusters. The grain size seemed increasing with the increase of nitrogen pressure. The bulk density of CS-SPSed MgSiN 2 was 3.11 g/cm 3 , Vickers hardness was 1673.1 kgf/mm 2 , and thermal diffusivity was 8.718E −2 cm 2 /s.

show abstract

“…Although combustion synthesis or self‐propagating high‐temperature synthesis (SHS) was applied to synthesize some (oxy) nitride phosphors, 8–10 there have been no previous studies of the dependence of nitridation kinetics on the composition of the single‐phase intermetallic compound, particle size, and reaction conditions. The nitridation of alloys or intermetallics 11–19 is considered beneficial for the formation of high‐purity nitrides for electronics applications, including phosphor research. This method has been applied to nitridation of molten Al alloys by nitrogen to produce AlN ceramic matrix composites 19 .…”

Section: Introductionmentioning

confidence: 99%

Nitridation of AEAlSi for Production of AEAlSiN₃:Eu²⁺ Nitride Phosphors (AE=Ca, Sr)

Watanabe

Imai

Kijima

2009

Journal of the American Ceramic Society

View full text Add to dashboard Cite

The nitridation process of Eu‐doped AEAlSi (AE=Ca and/or Sr) was investigated by thermogravimetry–differential thermal analysis to improve the method for synthesis of AEAlSiN3:Eu2+ nitride phosphors. The nitridation reactivity was dependent on alkaline earth elements. For SrxEuyCa1−x−yAlSi with a high Sr content, nitridation proceeded efficiently at 1100°–1150°C, close to the melting point of the intermetallic compounds. As nitridation of Si or Al intermetallics usually proceeds via the diffusion‐controlled surface reaction, sudden rupture of the diffusion barrier, the surface nitride layer, at the melting point could cause a marked change in the reaction rate and dependence on nitrogen partial pressure. The order of reactivity at temperatures close to the melting point agreed with the order of vapor pressure of alkaline earth elements at the melting point. A highly efficient process for large‐scale production of SrxCa1−xAlSiN3:Eu2+ phosphor was developed taking advantage of the characteristic nitridation reaction at the melting point.

show abstract

Reaction sintering of fluorine-doped MgSiN2

Cited by 9 publications

References 16 publications

Reaction synthesis and characterisation of lanthanum silicon nitride

Reaction synthesis and characterisation of lanthanum silicon nitride

Combustion Synthesis of MgSiN<sub>2</sub> Powder at Different Nitrogen Pressures

Nitridation of AEAlSi for Production of AEAlSiN₃:Eu²⁺ Nitride Phosphors (AE=Ca, Sr)

Contact Info

Product

Resources

About

Reaction sintering of fluorine-doped MgSiN2

Cited by 9 publications

References 16 publications

Reaction synthesis and characterisation of lanthanum silicon nitride

Reaction synthesis and characterisation of lanthanum silicon nitride

Combustion Synthesis of MgSiN&lt;sub&gt;2&lt;/sub&gt; Powder at Different Nitrogen Pressures

Nitridation of AEAlSi for Production of AEAlSiN3:Eu2+ Nitride Phosphors (AE=Ca, Sr)

Contact Info

Product

Resources

About

Combustion Synthesis of MgSiN<sub>2</sub> Powder at Different Nitrogen Pressures

Nitridation of AEAlSi for Production of AEAlSiN₃:Eu²⁺ Nitride Phosphors (AE=Ca, Sr)