<trans-title>Preparation of Silicon Nitride with High Thermal Conductivity and High Flexural Strength Using YbH<sub>2</sub>-MgO as Sintering Additive </trans-title>

Weide WANG; Huanbei CHEN; Shishuai LI; Dongxu YAO; Kaihui ZUO; Yuping ZENG

doi:10.15541/jim20200705

Journal of Inorganic Materials, Volume. 36, Issue 9, 959(2021)

Preparation of Silicon Nitride with High Thermal Conductivity and High Flexural Strength Using YbH₂-MgO as Sintering Additive

Weide WANG1...2, Huanbei CHEN3, Shishuai LI1,2, Dongxu YAO1,*, Kaihui ZUO1 and Yuping ZENG1 |Show fewer author(s)

Author Affiliations

¹1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

²2. University of Chinese Academy of Sciences, Beijing 100049, China

³3. Nanjing Electronic Devices Institute, Nanjing 210016, China

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Figures & Tables(9)

1. (a) Elemental distributions of YbHM after ball milling, (b) XRD patterns of α-Si₃N₄ raw powder, YbHM after ball milling, and YbHM after pre-sintering, (c) elemental distributions of YbHM after pre-sintering

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2. XRD patterns of powder mixture of YbH₂ and SiO₂ with moler ratio of 1 : 1 before and after pre-sintering

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3. (a) In-situ observation of shrinkage behaviors of the Si₃N₄ ceramics, (b) relative density after gas-pressure sintering, and (c) weight loss after gas-pressure sintering

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4. XRD patterns of Si₃N₄ samples after being sintered at 1900 ℃ for 4 and 24 h

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5. Elemental distributions of sample YbHM after being sintered at 1900 ℃ for 12 h

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6. SEM images of the polished surfaces

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7. EDS analysis of the intergranular phases in YbOM and YbHM specimens

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8. (a) Thermal conductivities and (b) flexural strengths of Si₃N₄ samples after gas pressure sintering

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Table 1. Thermal conductivities of Si₃N₄ doped with different rare-earth hydride

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Table 1. Thermal conductivities of Si₃N₄ doped with different rare-earth hydride

Additive	Ionic radius /nm	Annealing time at 1900 ℃/h	Thermal conductivity /(W·m^-1·K^-1)
GdH₂^[25]	0.094	4 h	98.07
		12 h	119.07
		24 h	134.90
YH₂^[23]	0.089	4 h	101.80
		12 h	123.00
		24 h	131.60
YbH₂	0.086	4 h	100.20
		12 h	118.90
		24 h	131.15

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Weide WANG, Huanbei CHEN, Shishuai LI, Dongxu YAO, Kaihui ZUO, Yuping ZENG. Preparation of Silicon Nitride with High Thermal Conductivity and High Flexural Strength Using YbH₂-MgO as Sintering Additive [J]. Journal of Inorganic Materials, 2021, 36(9): 959

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Paper Information

Category: RESEARCH ARTICLE

Received: Dec. 8, 2020

Accepted: --

Published Online: Dec. 9, 2021

The Author Email: YAO Dongxu (yaodongxu@mail.sic.ac.cn)

DOI:10.15541/jim20200705

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Thermal conductivities of Si3N4 doped with different rare-earth hydride

Table 1. Thermal conductivities of Si3N4 doped with different rare-earth hydride

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Table 1. Thermal conductivities of Si₃N₄ doped with different rare-earth hydride

Table 1. Thermal conductivities of Si₃N₄ doped with different rare-earth hydride