JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2024
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IF 2.2
Li Pengfei,Sui Yudong,Jiang Yehua,Zhou Mojin,Wang Zhijie
The effects of MgO addition on the microstructure and mechanical, frictional, and wear properties of zirconia-toughened alumina (ZTA) ceramics were investigated in this study using hot pressure sintering (HP). The addition of trace amounts of MgO led to the refinement of the ceramic grains and an increase in the ceramic density due to the pinning effect of MgO. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results revealed that an MgAl 2 O 4 phase was formed in the ceramics, which also contributed to the refinement of the ceramic grains. Moreover, the addition of MgO promoted the uniformity of the ceramic microstructure. Among the tested composites, the composite with 0.4 wt.% MgO exhibited the most favorable comprehensive properties, including a relative density of 99.61%, hardness of 18.29 GPa, and indentation fracture toughness of 9.15 MPa·m 1/2 , thereby offering the highest resistance to adhesive wear.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Rong Tu,Yijun Xu,Xiaoping Guo,Yibing Su,Yuzhe Han,Qizhong Li,Meijun Yang,Song Zhang,Takashi Goto
The incorporation of t-ZrO 2 into α-Al 2 O 3 matrix is a widely established method for enhancing the mechanical properties of ceramic materials, i.e. , zicornia toughened alumina (ZTA). In this study, acetylacetonate zirconium and acetylacetonate yttrium were thoroughly mixed with α-Al 2 O 3 powder and then calcined to achieve a uniform dispersion of organometallic-derived tetragonal zirconia polycrystal (TZP) particles in nano-size onto α-Al 2 O 3 , forming a composite powder. The TZP particle size increased from 8 to 39 nm with increasing calcination temperature from 600 to 1000 °C. The TZP nanoparticles coated α-Al 2 O 3 powder was sintered by spark plasma sintering (SPS) to obtain ZTA ceramics. TZP is embedded in the face-centered cubic skeleton formed by α-Al 2 O 3 and restricts grain growth to each other. The highest hardness and toughness, i.e. , 18.81 GPa and 10.31 MPa m 1/2 , of the ZTA ceramics was achieved at 1400 °C by using the composite powder calcined at 600 °C.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Shuang Yin,Chengyun Sun,Xiang Li,Yao Zhang,Xia Fang,Haiqiang Ma,Xinchun Xie,Liqiang Liu,Ruzhong Zuo
In this study, three micron-level spherical Al 2 O 3 powders (A: d 50 =98.7 μm; B: d 50 =48.7 μm; C: d 50 =5.9 μm), a submicron-level irregularly-shaped Al 2 O 3 powders (D: d 50 =0.8 μm), and a submicron-level irregularly-shaped yttria-stabilized zirconia powders (d 50 =0.5 μm) were used as raw materials to prepare 65 vol% zirconia-toughened alumina (ZTA) slurries with viscosity value of < 1.0 Pa·s near 100 s −1 by optimizing the pH value of slurries (pH=9–11) and particle gradation and powder ratio (A:B:C:D=0.63:5.67:2.7:1) using Dinger-Funk model. The ZTA ceramics prepared through gelcasting and pressureless sintering achieved a high densification of 97.94 % owing to high solid loading (65 vol%) and high sintering temperature (1700 ℃ for 2 h). Leveraging the synergistic effects of stress-induced t→m-ZrO 2 phase transformation toughening, micro-crack toughening, and dispersion strengthening, the ZTA ceramics exhibited good mechanical properties with a flexural strength of 577.2 MPa and a fracture toughness of 6.33 MPa·m 1/2 . Additionally, they exhibited apparent porosity, bulk density, and linear shrinkage of 0.42 %, 4.28 g/cm 3 , and 8.72 %, respectively. This study shows that the combination of gelcasting and pressureless sintering is a promising technical route to fabricate the high-strength and low-shrinkage ZTA ceramics using multi-gradation spherical Al 2 O 3 powders as raw materials.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Jianlong Chai,Yabin Zhu,Lijuan Niu,Tielong Shen,Minghuan Cui,Zhiguang Wang
Al 2 O 3 /ZrO 2 /SiC ceramic composites with different SiC contens have been prepared by hot pressuring. The effect of SiC content on the microstructure and mechanical properties of composites have been studied. The results show that SiC has obvious grain refinement effect on ZTA ceramics and change the fracture mode of the matrix from intergranular fracture to transgranular fracture . Simultaneously, it has been found that the mechanical properties of the material are significantly enhanced in comparison with ZTA matrix. The highest strength is acquired at 10% SiC content, the flexural strength and toughness are obtained when the SiC content is 15 vol%, and the values are 18.86 GPa, 1262 MPa and 6.13 MPa m 1/2 , respectively. The mechanisms of hardening, strengthening and toughening have been discussed.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）