Effects of zirconia doping on additively manufactured alumina ceramics by laser direct deposition

Pappas, John M.; Thakur, Aditya R.; Dong, Xiangyang

doi:10.1016/j.matdes.2020.108711

Cited by 42 publications

(17 citation statements)

References 33 publications

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“…4). This changing trend of microhardness is consistent with the results predicted by the mixing criterion [36,45], as shown in Eqs. ( 9) and (10).…”

Section: ) Microhardnesssupporting

confidence: 91%

“…Fan et al [26] have successfully fabricated highly dense Al 2 O 3 /YAG/ZrO 2 ternary eutectic melt-grown composites using this technology. Wu et al [34], Li et al [35], and Pappas et al [36] investigated the effect of initial composition on Al 2 O 3 /ZrO 2 melt-grown composits using this technology. They pointed out that adjusting the composition ratio of zirconia could suppress cracks and optimize the microstructure, improving the mechanical properties.…”

Section: Introduction mentioning

confidence: 99%

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Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Zhao

Shi

et al. 2021

J Adv Ceram

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Melt-grown alumina-based composites are receiving increasing attention due to their potential for aerospace applications; however, the rapid preparation of high-performance components remains a challenge. Herein, a novel route for 3D printing dense (< 99.4%) high-performance melt-grown alumina-mullite/glass composites using directed laser deposition (DLD) is proposed. Key issues on the composites, including phase composition, microstructure formation/evolution, densification, and mechanical properties, are systematically investigated. The toughening and strengthening mechanisms are analyzed using classical fracture mechanics, Griffith strength theory, and solid/glass interface infiltration theory. It is demonstrated that the composites are composed of corundum, mullite, and glass, or corundum and glass. With the increase of alumina content in the initial powder, corundum grains gradually evolve from near-equiaxed dendrite to columnar dendrite and cellular structures due to the weakening of constitutional undercooling and small nucleation undercooling. The microhardness and fracture toughness are the highest at 92.5 mol% alumina, with 18.39±0.38 GPa and 3.07±0.13 MPa·m1/2, respectively. The maximum strength is 310.1±36.5 MPa at 95 mol% alumina. Strength enhancement is attributed to the improved densification due to the trace silica doping and the relief of residual stresses. The method unravels the potential of preparing dense high-performance melt-grown alumina-based composites by the DLD technology.

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“…4). This changing trend of microhardness is consistent with the results predicted by the mixing criterion [36,45], as shown in Eqs. ( 9) and (10).…”

Section: ) Microhardnesssupporting

confidence: 91%

Section: Introduction mentioning

confidence: 99%

Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Zhao

Shi

et al. 2021

J Adv Ceram

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“…In particular, Al 2 O 3 ‐based MGCs have become a popular material for LDED process research in view of their excellent comprehensive performance and wide application requirements 9,15–17 . However, the inherent high intrinsic brittleness and thermal expansion coefficient make high‐temperature creep resistance become a shortcoming of Al 2 O 3 ‐based MGCs 18 .…”

Section: Introductionmentioning

confidence: 99%

Cracking mechanism in laser directed energy deposition of melt growth alumina/aluminum titanate ceramics

Huang

et al. 2023

J Am Ceram Soc.

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Thanks to its advantages of high efficiency and near-net shaping, laser directed energy deposition (LDED) is rapidly becoming a remarkable preparation technology for high-purity ceramics. However, the cracking problem in shaping process is always a great challenge for LDED to achieve industrial application. For this purpose, alumina/aluminum titanate melt-growth ceramics (A/AT MGCs) were prepared using LDED system, and the corresponding finite element thermal analysis model was developed. The solidification behavior and cracking mechanism of A/AT MGCs were investigated based on the thermal analysis model, and the influence of process parameters on the cracking characteristics was revealed with experiments. Results show that the crack morphology and distribution are controlled by microstructure and temperature gradient together. The scanning speed of 100-150 mm/min, with better microstructure and lower temperature gradient, is a preferred process window. This study provides theoretical guidance and technical support for the cracking suppression during LDED shaping of ceramics.

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“…Ceramics are advanced engineering materials that have superior mechanical properties, high strength, high hardness, low thermal conductivity, and chemical inertness [ 1 , 2 , 3 , 4 ]. Additionally, they have superior biocompatibilities, high abrasion resistance, and corrosion resistance [ 5 , 6 , 7 ]. These advantageous mechanical and physical properties make them highly applicable to various high-tech industries, including medical technology, semiconductor, mechanical engineering, aerospace, automotive, ballistic armor, electronic, and cutting tools [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

A Review on Surface Finishing Techniques for Difficult-to-Machine Ceramics by Non-Conventional Finishing Processes

et al. 2022

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Ceramics are advanced engineering materials in which have been broadly used in numerous industries due to their superior mechanical and physical properties. For application, the industries require that the ceramic products have high-quality surface finishes, high dimensional accuracy, and clean surfaces to prevent and minimize thermal contact, adhesion, friction, and wear. Ceramics have been classified as difficult-to-machine materials owing to their high hardness, and brittleness. Thus, it is extremely difficult to process them with conventional finishing processes. In this review, trends in the development of non-conventional finishing processes for the surface finishing of difficult-to-machine ceramics are discussed and compared to better comprehend the key finishing capabilities and limitations of each process on improvements in terms of surface roughness. In addition, the future direction of non-conventional finishing processes is introduced. This review will be helpful to many researchers and academicians for carrying out additional research related to the surface finishing techniques of ceramics for applications in various fields.

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Effects of zirconia doping on additively manufactured alumina ceramics by laser direct deposition

Cited by 42 publications

References 33 publications

Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Microstructure and mechanical properties of melt-grown alumina-mullite/glass composites fabricated by directed laser deposition

Cracking mechanism in laser directed energy deposition of melt growth alumina/aluminum titanate ceramics

A Review on Surface Finishing Techniques for Difficult-to-Machine Ceramics by Non-Conventional Finishing Processes

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