Lu2O3-MgO Nano-powder: Synthesis and Fabrication of Composite Infrared Transparent Ceramics

doi:10.15541/jim20210149

Abstract

Abstract:

Refining ceramic microstructures to nanometric range to minimize light scattering provides an effective methodology for developing novel optical ceramic materials. In this study, we reported the fabrication and properties of a new nanocomposite optical ceramic of Lu₂O₃-MgO by using nano powders synthesized via Sol-Gel method and hot-pressing sintering technology. Influence of powder synthesis conditions and hot-pressing sintering process on the microstructure of the sample was investigated, and the theoretical transmittance of the sample was calculated and compared with the measured transmittance. The results show that the Lu₂O₃-MgO ceramic fabricated by optimizing process exhibts a homogeneous phase domain distribution, a fine-grain size of 123 nm, a high transmittance of 84.5%-86.0% over the 3-5 μm wavelength range, close to the theoretical transmittance, and enhanced hardness value of 12.2 GPa, toughness value of 2.89 MPa·m^-1/2 and bending strength value of (221±12) MPa, indicating potential application in infrared transparent window material.

Key words: Sol-Gel method, hot-pressing sintering, Lu₂O₃-MgO, nano-composites, infrared window materials

CLC Number:

TQ174

MAN Xin, WU Nan, ZHANG Mu, HE Hongliang, SUN Xudong, LI Xiaodong. Lu₂O₃-MgO Nano-powder: Synthesis and Fabrication of Composite Infrared Transparent Ceramics[J]. Journal of Inorganic Materials, 2021, 36(12): 1263-1269.

Figures/Tables 8

Fig. 1 Thermal analysis curves of precursor foam

Fig. 2 XRD patterns of powders calcined at different temperatures

Table 1 Grain size and agglomeration factor φ of powders at different calcination temperatures

Temperature/℃	S_BET/(m²·g^-1)	D_BET/nm	D_XRD/nm	φ
400	58.2	15.9	7.2	2.21
500	54.3	17.0	8.6	1.98
600	51.1	18.1	9.3	1.95
700	41.9	22.0	10.6	2.08

Fig. 3 SEM images, relative densites and average grain sizes of the samples sintered at different temperatures (a) 1200 ℃; (b) 1250 ℃; (c) 1300 ℃; (d) 1350 ℃; (e) 1400 ℃; (f) Relative densities and average grain sizes of the samples sintered at different temperatures

Fig. 4 SEM images, relative densites and average grain sizes of the samples sintered at different heating rates (a) 15 ℃/min; (b) 20 ℃/min; (c) 30 ℃/min; (d) Relative densities and average grain sizes of the samples sintered at different heating rates

Fig. 5 SEM images, relative densites and average grain sizes of the samples annealed at different temperatures (a) 1100 ℃; (b)1150 ℃; (c)1200 ℃; (d) Relative densities and average grain sizes of the samples annealed at different temperatures

Fig. 6 Theoretical and actual transmittance of translucent Lu2O3-MgO nanocomposite ceramic (thickness≈2 mm) The inset shows the appearance of translucent Lu2O3-MgO nanocomposite ceramic

Table 2 Mechanical properties of the sample

Sample	HV hardness/GPa	Fracture toughness/(MPa·m^-1/2)	Bending strength/MPa
Lu₂O₃-MgO	12.2	2.89	(221±12)

References 24

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Lu₂O₃-MgO Nano-powder: Synthesis and Fabrication of Composite Infrared Transparent Ceramics

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