Enhancing permeability and porosity of ceramic shells for investment casting through pre-wetting

O'Sullivan, N.M.; Mooney, Joseph P.; Tanner, David A.

doi:10.1016/j.jeurceramsoc.2021.09.022

Cited by 6 publications

(3 citation statements)

References 51 publications

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“…Therefore, a large amount of researches have been conducted on how to improve the surface fire resistance [12][13][14] , collapsibility and strength [15][16] . The preparation process system and quality evaluation system of mold shell for investment casting have been formed [17][18][19] .…”

Section: Instructionmentioning

confidence: 99%

Research on the Impact Behavior of Molten Metal on the Mold Shell in Gravity Casting of Large Titanium alloy Castings

ZHU,

LIN

et al. 2024

Res. Appl. Mater. Sci.

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The impact behavior of molten metal on the mold shell in gravity casting of large titanium alloy castings by investment precision castings was studied. The physical and mechanical models of the impact of molten metal on the mold shell during the pouring process were constructed using numerical simulation. The effects of molten metal pouring rate and pouring weight on the maximum impact force of the mold shell were studied. The research results indicated that during the entire pouring process, the impact force of the first molten metal contacting the mold shell was higher than subsequent molten metal. The maximum impact force increased with the increase of pouring rate and pouring weight. The total impact force of the molten metal on the mold shell was composed of the instantaneous impact force converted from instantaneous impulse and itself gravity. The instantaneous impact force of the molten metal that first impacts the mold shell was much greater than its own gravity, while the impact force of the molten metal at the end of pouring was much less than its own gravity. The maximum impact force on the mold shell of a large casting with a pouring weight of 800kg was about three times higher than that of a medium-sized casting with a pouring weight of 80kg.The difference in the total impact force on the mold shell between them mainly comes from the instantaneous impact force converted from instantaneous impulse.

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Section: Instructionmentioning

confidence: 99%

Research on the Impact Behavior of Molten Metal on the Mold Shell in Gravity Casting of Large Titanium alloy Castings

ZHU,

LIN

et al. 2024

Res. Appl. Mater. Sci.

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“…However, 3D effects like tortuosity, shape, anisotropy, and general connectedness are unobservable by optical/electron microscopies, for which precise quantification is not tenable. Gaseous adsorption methods, like those based on Brunauer-Emmett-Teller (BET) theory, are far more accurate; however, the localized insight is forgone, and closed-cell type porosity is poorly characterized by BET methods.X-ray Microtomography (XRM) is becoming more common for porosity analysis in ceramics [10][11][12][13] . The success of XRM in this regard is predicated on the favorable field of view (number statistics), localization, and indifference towards pore percolation.…”

mentioning

confidence: 99%

“…X-ray Microtomography (XRM) is becoming more common for porosity analysis in ceramics [10][11][12][13] . The success of XRM in this regard is predicated on the favorable field of view (number statistics), localization, and indifference towards pore percolation.…”

mentioning

confidence: 99%

Quantitative estimation of closed cell porosity in low density ceramic composites using X-ray microtomography

Smith

Garcia

Rodríguez

et al. 2023

Sci Rep

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X-ray Microtomography is a proven tool for phase fraction analysis of multi-phase systems, provided that each phase is adequately partitioned by some means of data processing. For porosity in materials containing low-density ceramic phases, differentiation between pores and the low-density phase(s) can be intractable due to low scattering in the low-density phase, particularly if small pores necessitate low binning. We present a novel, combined methodology for accurate porosity analysis—despite these shortcomings. A 3-stage process is proposed, consisting of (1) Signal/noise enhancement using non-local means denoising, (2) Phase segmentation using a convolutional neural network, and (3) Quantitative analysis of the resulting 3D pore metrics. This particular combination of denoising and segmentation is robust against the fragmentation of common segmentation algorithms, while avoiding the volitional aspects of model selection associated with histogram fitting. We discuss the procedure applied to ternary phase SiC–TiC-diamond composites produced by reactive spark plasma sintering with porosity spanning 2–9 vol%.

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Effect of shell mold thickness and insulating wool pattern on internal porosity in investment casting of vortex flow meter

Tseng¹,

Chen²,

Kao³

et al. 2023

Int J Adv Manuf Technol

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Enhancing permeability and porosity of ceramic shells for investment casting through pre-wetting

Cited by 6 publications

References 51 publications

Research on the Impact Behavior of Molten Metal on the Mold Shell in Gravity Casting of Large Titanium alloy Castings

Research on the Impact Behavior of Molten Metal on the Mold Shell in Gravity Casting of Large Titanium alloy Castings

Quantitative estimation of closed cell porosity in low density ceramic composites using X-ray microtomography

Effect of shell mold thickness and insulating wool pattern on internal porosity in investment casting of vortex flow meter

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