Selective laser sintering of porous Al2O3-based ceramics using both Al2O3 and SiO2 poly-hollow microspheres as raw materials

Wu, Jia‐Min; Meng, Liang; Liu, Shanshan; Shi, Yusheng; Li, Chenhui; Wang, Wei

doi:10.1016/j.ceramint.2021.02.096

Cited by 45 publications

(20 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coagulation time could be reduced to 600 s when the microwave heating temperature increases to 75°C. Microwave heating has shortened the coagulation time by 77% compared with the water bath heating reported in the previous study, 13 which greatly improves the production efficiency.…”

Section: Resultsmentioning

confidence: 84%

“…In recent years, additive manufacturing has also provided novel ideas for fabricating ceramic parts with complex structures. [7][8][9][10][11][12][13] Among them, direct coagulation casting (DCC) is a simple and novel way to fabricate ceramics with uniform microstructure. It realizes the solidification of the suspension by controlling the reaction rate inside the suspension.…”

mentioning

confidence: 99%

See 1 more Smart Citation

High‐performance Al₂O₃ ceramics prepared by DCC‐HVCI via microwave heating

et al. 2021

J Am Ceram Soc.

View full text Add to dashboard Cite

Colloidal forming [1][2][3][4][5][6] is a well-known method to fabricate ceramic components. In recent years, additive manufacturing has also provided novel ideas for fabricating ceramic parts with complex structures. [7][8][9][10][11][12][13] Among them, direct coagulation casting (DCC) is a simple and novel way to fabricate ceramics with uniform microstructure. It realizes the solidification of the suspension by controlling the reaction rate inside the suspension. 14,15 However, the low compressive

show abstract

Section: Resultsmentioning

confidence: 84%

mentioning

confidence: 99%

High‐performance Al₂O₃ ceramics prepared by DCC‐HVCI via microwave heating

et al. 2021

J Am Ceram Soc.

View full text Add to dashboard Cite

show abstract

“…A promising method for building special porous and segmented structures is selective laser sintering [33][34][35][36]. Using such an approach, it would be possible to synthesize structures composed of polycrystalline porous segments and large pores, which would generate a desired pattern of compaction bands under compression loading.…”

Section: Future Effortsmentioning

confidence: 99%

In Situ Investigation of Strain Localization in Sintered, Porous Segmented Alumina

et al. 2021

View full text Add to dashboard Cite

Evaporation of paraffin and ultra-high-molecular-weight polyethylene admixed with alumina powder for the slip casting and sintering process allowed the obtainment of segmented porous alumina ceramics with 50% total porosity, whose deformation behavior we studied. Structurally, these ceramic materials were composed of large and small pores, and a system of discontinuities subdividing the samples into segments. Using digital image correlation (DIC), strain distribution maps were obtained that allowed the observation of strain localization zones, where primary cracks propagated along the interblock discontinuities. Two stages were revealed to be responsible for different mechanisms that provided the sample with damage tolerance under compression loading: the first stage was crack propagation along the block boundaries, which was followed by the second stage of microcracking and fragmentation, consisting of filling of the free spaces with fragments, compaction band generation, and stabilization of the crack. Both stages comprise a cycle that is repeated again and again until the full volume of the sample is occupied by the compaction bands.

show abstract

“…Open pores have the functions of filtering and adsorption, whereas closed pores have the characteristics of heat insulation and blocking sound 34 . Typical technologies for producing porous ceramics mainly involve direct foaming method, freeze casting method, sacrificial template method, additive manufacturing technique, reaction sintering, and so forth 35–39 . Direct foaming method can be used to prepare porous ceramics with both high strength and high porosity, and there is no discharge of hazardous waste during the preparation process 40 .…”

Section: Introductionmentioning

confidence: 99%

Porous ceramics with near‐zero shrinkage and low thermal conductivity from hazardous secondary aluminum dross

Zhang

Shen

et al. 2022

J Am Ceram Soc

View full text Add to dashboard Cite

Herein, a simple, versatile, and low-cost approach has been proposed to realize the green utilization of secondary aluminum dross, the hazardous solid waste, namely directly sintering dry-pressed green bodies from secondary aluminum dross to fabricate porous ceramics according to high-temperature foaming process spontaneously without adding spare foaming agents. Aluminum nitride (AlN) in secondary aluminum dross was employed to realize high-temperature foaming due to its oxidation, which makes traditional AlN and salts removal process needless. Moreover, near-zero shrinkage or even expansion during sintering of porous ceramics have occurred because in-situ foaming process together with the oxidation of Al particles well offset the sintering shrinkage. After sintering at 1400 • C for 2 h, porous ceramics composed of α-Al 2 O 3 and spinel phases with open porosity of 37.91%, sintering expansion rate of 1.13%, flexural strength of 45.67 MPa, and thermal conductivity of 0.97 W/(m⋅K) have been prepared. Cenospheres as pore-forming agents have been added to further improve the porosity, and alumina-based porous ceramics with open porosity of 28.39%-43.20% and flexural strength of 15.80-52.48 MPa have been obtained. This effective solution for recycling secondary aluminum dross could supply high-performance porous ceramics, which is expected to be applied in the fields of light-weight structural components and thermal insulations.

show abstract

Selective laser sintering of porous Al2O3-based ceramics using both Al2O3 and SiO2 poly-hollow microspheres as raw materials

Cited by 45 publications

References 27 publications

High‐performance Al₂O₃ ceramics prepared by DCC‐HVCI via microwave heating

High‐performance Al₂O₃ ceramics prepared by DCC‐HVCI via microwave heating

In Situ Investigation of Strain Localization in Sintered, Porous Segmented Alumina

Porous ceramics with near‐zero shrinkage and low thermal conductivity from hazardous secondary aluminum dross

Contact Info

Product

Resources

About

Selective laser sintering of porous Al2O3-based ceramics using both Al2O3 and SiO2 poly-hollow microspheres as raw materials

Cited by 45 publications

References 27 publications

High‐performance Al2O3 ceramics prepared by DCC‐HVCI via microwave heating

High‐performance Al2O3 ceramics prepared by DCC‐HVCI via microwave heating

In Situ Investigation of Strain Localization in Sintered, Porous Segmented Alumina

Porous ceramics with near‐zero shrinkage and low thermal conductivity from hazardous secondary aluminum dross

Contact Info

Product

Resources

About

High‐performance Al₂O₃ ceramics prepared by DCC‐HVCI via microwave heating

High‐performance Al₂O₃ ceramics prepared by DCC‐HVCI via microwave heating