JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·2021-2028
·
IF 2.956
Xiaokai Li,Qiangqiang Zhu,Yangyang Xu,Xiaojian Mao,Minghui Feng,Benxue Jiang,Long Zhang
Highly transparent Y 2 O 3 ceramics using TiO 2 as an additive were synthesized by presintering and hot isostatic pressing (HIP). The effects of TiO 2 contents and sintering conditions on the optical properties of the final transparent ceramics were investigated. A small amount (0.04-0.16 wt%) may decrease the densification temperature by about 200°C. The Y 2 O 3 ceramics doped with 0.16 wt% TiO 2 revealed a transparency of 82% in the wavelength range 1-6 μm. The thermal conductivity of the samples is about 11.8 W/m K at 25°C, which is close to that of the undoped Y 2 O 3 ceramics.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yifei Cao,Haoyu Li,Xinyu Zheng,Siqing Wang,Chunming Zhou,Shiwei Chen,Peng Yang,Tianyuan Zhou,Hao Chen,Le Zhang
Zr 4+ ion doping is an effective method to enhance the optical and mechanical qualities of Y 2 O 3 transparent ceramics. In most previous studies, slowing down densification and inhibiting grain growth of Y 2 O 3 ceramic are generally recognized as the primary function of Zr 4+ additive during sintering. In this work, an interesting simultaneous precipitation phenomenon of Zr 4+ and Y 3+ ions was discovered and it directly led to the refinement of precursors and Y 2 O 3 powders. Consequently, the acting mechanisms of Zr additive should be demonstrated as the synergistic effect of refining precursor, producing oxygen interstitial and promoting solute-drag. Microstructure evolution and optical quality of Zr doped Y 2 O 3 ceramics were further investigated in detail. By doping 3.0 at.% Zr 4+ ions, Y 2 O 3 transparent ceramics with a transmittance as high as 82.3% at 1064 nm could be realized, after sintering at 1775 °C for 8h in vacuum. In general, this essential synergistic effect should be adequately considered in the preparation of heterogeneous ion doped transparent ceramics using the co-precipitation method.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Yiming Yu,Yaowu Wei,Kui Liu,Bo Chen,Junfeng Chen
This paper aims to improve the density and thermal shock resistance of Y 2 O 3 ceramics for the preparation of ultra-pure high-temperature alloy crucible materials. The doping effect of MgF 2 content on the densification behavior, physical properties, and thermal shock resistance of Y 2 O 3 ceramics was systematically investigated in this paper. The results suggested that the presence of MgF 2 greatly promoted the growth of Y 2 O 3 grains and the transformation of the pore structure by liquid-phase sintering. And the mechanical properties of the MgF 2 -doped Y 2 O 3 ceramics were significantly improved. Besides, the marked improvement in the thermal shock resistance of MgF 2 -doped Y 2 O 3 ceramics was attributed to the synergistic action resulting from the growth of grain size and the enhancement of the crack deflection effect. In particular, the relative density of Y 2 O 3 ceramics doped with 1.5 wt% MgF 2 reached 96.4% and the residual flexural strength ratio after thermal shock achieved 45.0%, showing an excellent application prospect.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhuangzhuang Ma,Lu Chen,Jian Chen,Wang Guo
This paper presents the successful homogeneous processing of Y 2 O 3 green compacts by pressure-assisted alcoholic slip casting (PASC) method for the preparation of high-quality Y 2 O 3 transparent ceramics. The optimal Y 2 O 3 alcoholic slurry with 1.5 wt% polyethyleneimine as the dispersant and the solid load of 30.69 vol% was employed for PASC. Compared to dry-pressing green compact, PASC-prepared green compact exhibits high homogeneity and sinterability with less microstructural defects, such as large pores or particle agglomeration . Based on these advantages, we successfully prepared transparent Y 2 O 3 ceramic by simply vacuum sintering with low porosity, excellent optical homogeneity, and high in-line transmittance of 80.4% at the wavelength of 600 nm.
研究领域:
材料科学
·
陶瓷加工技术
✓ 已验证
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 5
·956
·
IF 3.4
Shaohua Zhang,Jinfang Wang,Meng Zhang,Longqi Ding,Huijun Chan,Xiyu Liu,Fengqing Wu,Zhibiao Tu,Ling Shao,Nengyong Ye,Sheng Dai,Liu Zhu,Shichang Chen
Sintering additives are commonly used to reduce the conditions required for densification in composite ceramics without compromising their performances simultaneously. Herein, SiC/SiCw-Y2O3composite ceramics with 10 vol.% SiC whiskers (SiCw) and different Y2O3contents (0, 2.5, 5, 7.5, and 10 vol.%) were fabricated by hot-pressed sintering at 1800 °C, and the effects of Y2O3content on the microstructure, mechanical properties, and tribological behaviors were investigated. It was found that the increased Y2O3content can promote the densification of SiC/SiCw-Y2O3composite ceramics, as evidenced by compact microstructure and increased relative density. The Vickers hardness, fracture toughness, and flexural strength also increased when Y2O3content increased from 2.5 vol.% to 7.5 vol.%. However, excessive Y2O3(10 vol.%) aggregated around SiC and SiCwweakens its positive effect. Furthermore, the Y2O3additive also reduces the coefficient of friction (COF) of SiC/SiCw-Y2O3composite ceramics, the higher the Y2O3content, the lower the COF. The wear resistance of SiC/SiCw-Y2O3composite ceramics is strongly affected by their microstructure and mechanical properties, and as-sintered SiC ceramic with 7.5 vol.% Y2O3(Y075) shows the optimal wear resistance. The relative density, Vickers hardness, fracture toughness, and flexural strength of Y075 are 97.0%, 21.6 GPa, 7.7 MPa · m1/2, and 573.2 MPa, respectively, the specific wear rate of Y075 is 11.8% of that for its competitor with 2.5 vol.% Y2O3.Keywords:SiC/SiCw-Y2O3ceramics;hot-pressed sintering;Y2O3additive;mechanical properties;tribological behaviors
研究领域:
材料科学
·
陶瓷工程
·
机械工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）