Preparation and properties of spodumene/silicon carbide composite ceramic materials

Yuan-Yuan Lu; Gui-Hua Lu; Heng-Wei Zhou; Yi-Neng Huang

doi:10.7498/aps.69.20200232

Journals >Acta Physica Sinica >Volume 69 >Issue 11 >Page 117701-1 > Article

Acta Physica Sinica
Vol. 69, Issue 11, 117701-1 (2020)

Preparation and properties of spodumene/silicon carbide composite ceramic materials

Yuan-Yuan Lu¹, Gui-Hua Lu¹, Heng-Wei Zhou^1、*, and Yi-Neng Huang^1、2、*

Author Affiliations

¹Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining 835000, China

²National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China

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DOI: 10.7498/aps.69.20200232 Cite this Article

Yuan-Yuan Lu, Gui-Hua Lu, Heng-Wei Zhou, Yi-Neng Huang. Preparation and properties of spodumene/silicon carbide composite ceramic materials[J]. Acta Physica Sinica, 2020, 69(11): 117701-1 Copy Citation Text

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XRD patterns of β-spodumene: (a) β-LiAlSi2O6; (b) ICSD No. 01-071-2058

Fig. 1. XRD patterns of β-spodumene: (a) β-LiAlSi₂O₆; (b) ICSD No. 01-071-2058

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Fig. 2. XRD patterns of spodumene/silicon carbide composi-tes.

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Fig. 3. XRD patterns of 40SP sample in the starting and the sintered at 1550 ℃.

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$SEM micrographs of the fracture surface of spodumene/silicon composites: (a) 25SP; (b) 30SP; (c) 35SP; (d) 40SP.$

Fig. 4. SEM micrographs of the fracture surface of spodumene/silicon composites: (a) 25SP; (b) 30SP; (c) 35SP; (d) 40SP.

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Fig. 5. Apparent porosity and Young’s modulus of the spodumene/silicon carbide composites.

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Fig. 6. Expansion versus temperature of the spodumene/sili-con carbide composites.

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Fig. 7. Microcrack of 35 SP composite.

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System/material	CET/10^–6 ℃^–1	Temperature range/℃
Li₂O·Al₂O₃·2SiO₂ (LiAlSiO₄, Eucryptite)	–6.2	25—800
Li₂O·Al₂O₃·3SiO₂ (Solid solution of eucryptite)	Negative near zero CET	25—1000
Li₂O·Al₂O₃·4SiO₂ (β-LiAlSi₂O₆, β-Spodumene)	0.9	25—1000
Li₂O·Al₂O₃·6SiO₂ (LiAlSi₃O₈, Virgilite)	0.5	25—1000
Li₂O·Al₂O₃·8SiO₂ (LiAlSi₄O₁₀, Petalite)	0.3	25—1000
Li₂O·Al₂O₃·10SiO₂	0.5	25—1000
LAS + TiO₂ (Pyroceram)	–0.07—0.30
LAS + TiO₂ + ZrO₂ (Cer-Vit)	0.05—0.30
Hercuvit (LAS-based transparentlow expanding glass-ceramic)	0—0.3

Table 1. Average linear thermal expansion coefficient (CET) of some important materials based on LAS system.

Phase	Si, Al—O/Å	Li—O/ Å	Si, Al—Li/Å	O—O (Li tetrahedra)/Å	O—O (Si, Al tetrahedra)/Å	V/Å³	D_c/g·cm^–3
Te-SP	1.643	2.081	2.628/2.710	3.339	2.682	520.671	2.374
He-SP	1.641	2.068	2.609	3.337	2.679	128.790	2.399

Table 2.

The atomic bond lengths, cell volume and density of tetragonal and hexagonal spodumene.

四方相β-锂辉石和六方相锂辉石原子键长、晶胞体积和密度

β–Spodumene content/ mass%	Apparent porosity/ %	Bulk density/ g·cm^–3	Young’s modulus/ GPa	α (–150—25 ℃)/ ℃^–1	α (25—480 ℃)/ ℃^–1
SP25	38	1.81	95.3 ± 0.1	0.23 × 10^–6	1.83 × 10^–6
SP30	32	1.82	123.8 ± 0.4	0.60 × 10^–6	2.95 × 10^–6
SP35	19	2.24	204.2 ± 0.5	0.53 × 10^–6	5.71 × 10^–6
SP40	29	1.95	119.6 ± 0.5	1.14 × 10^–6	2.50 × 10^–6

Table 3.

Characteristics of spodumene/ silicon carbide composites.

锂辉石/碳化硅复相陶瓷材料的性能

Yuan-Yuan Lu, Gui-Hua Lu, Heng-Wei Zhou, Yi-Neng Huang. Preparation and properties of spodumene/silicon carbide composite ceramic materials[J]. Acta Physica Sinica, 2020, 69(11): 117701-1

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