Fabrication and Characterizations of Red Ce-doped 8YSZ Transparent Ceramics by Two-step Sintering

doi:10.15541/jim20220025

Abstract

Abstract:

Color zirconia ceramics are widely used in electronics and decoration fields due to their bright colors, high refractive index, wear resistance, corrosion resistance, and non-toxicity to the human body. Cubic cerium doped 8% yttria mol percent stabilized zirconia (Ce-doped 8YSZ) nano-powder with average particle size of 15.9 nm was synthesized by co-precipitation method. Using the powder calcined at 800 ℃ for 4 h as starting material, red zirconia transparent ceramics with high optical transparency and high redness value were prepared by two-step sintering method. Influences of pre-sintering temperature on microstructure, in-line transmittance and color performance of the red Ce-doped 8YSZ ceramics were studied. As the pre-sintering temperature increases from 1200 ℃ to 1300 ℃, average grain size of the ceramics increases from 0.3 μm to 2.2 μm and the relative density increases from 87.2% to 97.1%. The Ce-doped 8YSZ ceramics pre-sintered at 1275 ℃ for 2 h and hot isostatic pressed (HIP) at 1700 ℃ for 3 h show the best in-line transmittance of 47.6% at 700 nm and the highest redness of 52.0.

Key words: Ce-doped 8YSZ, red transparent ceramics, air pre-sintering, hot isostatic pressing, optical property

CLC Number:

TQ174

LIU Qiang, WANG Qian, CHEN Penghui, LI Xiaoying, ZHANG Lixuan, XIE Tengfei, LI Jiang. Fabrication and Characterizations of Red Ce-doped 8YSZ Transparent Ceramics by Two-step Sintering[J]. Journal of Inorganic Materials, 2022, 37(8): 911-917.

Figures/Tables 10

Fig. 1 TG-DTA curves of the Ce-doped 8YSZ precursor

Fig. 2 XRD patterns of (a) Ce-doped 8YSZ precursor and (b) the powder calcined at 800 ℃ for 4 h

Fig. 3 FESEM micrographs of (a) Ce-doped 8YSZ precursor and (b) the powder calcined at 800 ℃ for 4 h

Fig. 4 FESEM micrographs of the thermally etched surfaces of Ce-doped 8YSZ ceramics pre-sintered at different temperatures in air for 2 h (a) 1200 ℃; (b) 1230 ℃; (c) 1250 ℃; (d) 1275 ℃; (e) 1300 ℃

Fig. 5 Relative densities and average grain size of the Ce-doped 8YSZ ceramics pre-sintered at 1200-1300 ℃ in air for 2 h

Fig. 6 (a-e) FESEM micrographs of the thermally etched surfaces of Ce-doped 8YSZ ceramics pre-sintered at 1200- 1300 ℃ for 2 h and HIP post-treatment at 1700 ℃ for 3 h; (f-i) EDS element mapping of the Ce-doped 8YSZ ceramics pre-sintered at 1275 ℃ (a) 1200 ℃; (b) 1230 ℃; (c) 1250 ℃; (d) 1275 ℃; (e) 1300 ℃

Fig. 7 XRD patterns of the (a) pre-sintering and (b) HIP-treatment ceramics

Fig. 8 (a) Photograph and (b) in-line transmittance of the Ce-doped 8YSZ ceramics (1 mm thick) pre-sintered at 1200-1300 ℃ in air for 2 h and HIP post-treatment at 1700 ℃ for 3 h under 176 MPa in Ar atmosphere

Fig. 9 Absorption spectra of the ceramics pre-sintered at different temperatures and HIP post-treatment at 1700 ℃

Table 1 CIE value of Ce-doped 8YSZ ceramics pre- sintered at 1230-1300 ℃ for 2 h and HIP post-treatment at 1700 ℃ for 3 h

Pre-sintering temperature/℃	Value of CIE
Pre-sintering temperature/℃	L^*	a^*	b^*
1230	31.8	42.5	54.7
1250	37.4	48.6	64.3
1275	42.4	52.0	72.9
1300	37.7	48.9	64.8

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