Microstructures and performance of CaO-based ceramic cores with different particle size distributions for investment casting

Zhou, Pengpeng; Wu, Guo Qing; Tao, Ye; Cheng, Xu; Zhao, Jian; Hu, Nan

doi:10.1088/2053-1591/aaa608

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…It is well known that when raising the sintering temperature, the densification of a ceramic material is increased and the porosity is decreased 39 . However, the ceramic cores require a porosity greater than 20 vol%, in general, to provide space for the penetration of the alkaline liquid that dissolves them after the casting process 40 . Therefore, the micro‐scale pores are instrumental in improving the overall porosity of the parts for their application as ceramic cores in the hollow blades manufacturing process.…”

Section: Resultsmentioning

confidence: 99%

“…39 How-ever, the ceramic cores require a porosity greater than 20 vol%, in general, to provide space for the penetration of the alkaline liquid that dissolves them after the casting process. 40 Therefore, the micro-scale pores are instrumental in improving the overall porosity of the parts for their application as ceramic cores in the hollow blades manufacturing process. No obvious difference in the micro-scale pores in the ceramics impregnated with different solutions is present, as shown in Figure 4.…”

Section: Microstructure and Element Compositionmentioning

confidence: 99%

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Enhanced 3D printed alumina ceramic cores via impregnation

Colombo

et al. 2021

J Am Ceram Soc

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3D-printed alumina ceramic cores often face the problem of low flexural strength at its application temperature of 1500°C, and the requirements on porosity and strength limit its fabrication process. In this research, three types of solutions were employed to impregnate the ceramics to improve the strength of the 3Dprinted alumina ceramic cores. The results showed that silica sol (SS), tetraethyl orthosilicate (TO), and 3-(Trimethoxysilyl)propyl methacrylate (PM) all could improve the (room temperature) flexural strength of the 3D printed ceramics effectively compared to the control sample (CS) without impregnation, and the SS solution could improve the high temperature flexural strength at 1500°C greatly compared to other solutions. The improvement in strength was due to the introduction of Si, which formed a stable mullite phase during the sintering process. Computed tomography (CT) analysis showed there is no cracks formed in the ceramic cores impregnated with the SS solution, and they exhibited the overall best performance (21.2 ± 0.8 vol% open porosity, shrinkage of 3.2 ± 0.3% in the X direction, 3.4 ± 0.2% in the Y direction, 2.1 ± 0.4% in the Z direction, room temperature flexural strength of 85.7 ± 6.9 MPa, and 1500°C flexural strength of 19.2 ± 1.1 MPa).

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Section: Resultsmentioning

confidence: 99%

Section: Microstructure and Element Compositionmentioning

confidence: 99%

Enhanced 3D printed alumina ceramic cores via impregnation

Colombo

et al. 2021

J Am Ceram Soc

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“…Particle packing methods are greatly influenced by the size of SiC powder and particle size distribution because the pore within SiC porous ceramics is formed from SiC powder accumulation. Therefore, the pore size can be controlled, and the strength of ceramic products can be improved by the proper particle grading composition of SiC powder [16][17][18][19]. However, it is difficult to obtain porous ceramics' high strength and high porosity simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Effects of particle grading composition of SiC on properties of silicon-bonded SiC porous ceramics

Zhao

Zhuo

et al. 2022

Mater. Res. Express

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Silicon-bonded silicon carbide (SBSC) porous ceramics had been prepared by mixing two different particle size of SiC powder (coarse and fine) as aggregates for silicon carbide porous ceramics, adding metallic Si as the binder phase and firing at 1450 °C under argon atmosphere. Various combinations of SiC mixtures consisting of two different particle size and packing density were prepared, and the samples were investigated to understand apparent porosity, bending strength, pore size distribution, and microstructure. The result showed that mixing an appropriate proportion of SiC coarse and fine powders could not only improve the pore size distribution of SBSC porous ceramics but also significantly increase the bending strength compared with the single-particle size sample. The system had the highest free packing density when the ratio of coarse to fine SiC size was >2 and the coarse powder content was 60-70 wt%. The optimal bending strength, and apparent porosity were 37.53 MPa and 37.11% respectively when mixing 70 wt% of coarse powder (50.8 μm) and 30 wt% of fine powder (9.5 μm) and sintered at 1450 ℃ in an argon atmosphere. The material created had 100.3% increased bending strength, and 0.99% decreased porosity compared with the single-particle size sample (50.8 μm).

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