Mechanical Properties and Thermal Conductivity of Si3N4 Ceramics with Composite Sintering Additives

Shi FU; Zengchao YANG; Honghua LI; Liang WANG; Jiangtao LI

doi:10.15541/jim20220101

Journals >Journal of Inorganic Materials >Volume 37 >Issue 9 >Page 947 > Article

Journal of Inorganic Materials
Vol. 37, Issue 9, 947 (2022)

Mechanical Properties and Thermal Conductivity of Si₃N₄ Ceramics with Composite Sintering Additives

Shi FU^1,2, Zengchao YANG¹, Honghua LI^1,*, Liang WANG¹, and Jiangtao LI^1,2,*

Author Affiliations

¹1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100190, China

²2. Center of Materials Science and Optoelectronics Engineering, University of the Chinese Academy of Science, Beijing 100049, China

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DOI: 10.15541/jim20220101 Cite this Article

Shi FU, Zengchao YANG, Honghua LI, Liang WANG, Jiangtao LI. Mechanical Properties and Thermal Conductivity of Si₃N₄ Ceramics with Composite Sintering Additives [J]. Journal of Inorganic Materials, 2022, 37(9): 947 Copy Citation Text

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XRD patterns of Si3N4 ceramics with different additive systems prepared by hot pressing sintering

1. XRD patterns of Si₃N₄ceramics with different additive systems prepared by hot pressing sintering

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SEM images of the polished surfaces of Si3N4 ceramics with different additive systems prepared by hot pressing sintering

2. SEM images of the polished surfaces of Si₃N₄ ceramics with different additive systems prepared by hot pressing sintering

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3. XRD patterns of Si₃N₄ceramics with different additive systems after annealing

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4. SEM images of the polished surfaces of Si₃N₄ceramics with different additive systems after annealing

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$(a) Average grain size, (b) bending strength, (c) fracture toughness, and (d) thermal conductivity changing with radius of rare earth ion of Si3N4 ceramics before and after annealing$

5. (a) Average grain size, (b) bending strength, (c) fracture toughness, and (d) thermal conductivity changing with radius of rare earth ion of Si₃N₄ ceramics before and after annealing

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6. Microstructures of Si₃N₄ceramic samples before and after annealing

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Sample	Ionic radius/nm	Relative density/%	Grain size/μm	Vickers’ hardness/GPa	Flexural strength/MPa	Fracture toughness/ (MPa·m^1/2)	Thermal conductivity/ (W·m^-1·K^-1)
ScM	0.073	99.36	0.72±0.32	14.58±0.25	905±36	8.21±0.09	54.7
LuM	0.085	99.53	0.9±0.40	14.75±0.20	785±25	8.01±0.12	49.6
YbM	0.086	99.49	0.97±0.47	14.75±0.27	759±20	8.03±0.16	49.7
YM	0.089	99.73	1.03±0.46	14.64±0.29	819±10	8.65±0.11	51.1
GdM	0.094	99.89	1.01±0.48	14.57±0.22	792±34	7.62±0.47	54.6
NdM	0.100	99.37	0.95±0.42	14.79±0.27	1115±49	7.19±0.10	53.9
LaM	0.106	99.21	0.9±0.41	15.37±0.33	978±39	7.25±0.10	52.8

Table 1. Properties of Si₃N₄ceramic samples prepared by hot pressing sintering

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