Functionally graded calcium zirconate molds with alginate-based spray coating for titanium investment casting

Freitag, Lisa; Schmidt, Gert; Hubálková, Jana; Bulling, Florian; Klotz, Ulrich; Aneziris, Christos G.

doi:10.1016/j.jeurceramsoc.2021.10.024

Cited by 5 publications

(3 citation statements)

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“…To create a reductive pre-sintering atmosphere, Ti 3 Al(Si)C 2 ceramics were pre-sintered in the graphite bed at 1100, 1300 and 1500 • C, respectively. According to the actual production conditions of titanium alloys, many researchers 57 , [63][64][65][66] investigated the reaction behavior between refractories and molten alloys by smelting and casting with long-term exposure. For example, Klotz et al 64 found that the reaction degree between CaZrO 3 and titanium alloys was low, and the formation of an alpha case was avoided using CaZrO 3 molds.…”

Section: Introductionmentioning

confidence: 99%

“…However, the sessile drop test was a valid method for investigating the interfacial behavior between melts and substrates due to the simple experimental setup combined with the relatively easy application at high temperatures. [65][66][67][68] Compared with the casting test after long-term molten alloy in crucibles, the sessile drop test could also avoid the influence of the crucible composition and smelting batch on the alloy. Therefore, the interfacial behavior between molten Ti6Al4V alloy with pre-sintered…”

Section: Introductionmentioning

confidence: 99%

“…found that the reaction degree between CaZrO 3 and titanium alloys was low, and the formation of an alpha case was avoided using CaZrO 3 molds. However, the sessile drop test was a valid method for investigating the interfacial behavior between melts and substrates due to the simple experimental setup combined with the relatively easy application at high temperatures 65–68 . Compared with the casting test after long‐term molten alloy in crucibles, the sessile drop test could also avoid the influence of the crucible composition and smelting batch on the alloy.…”

Section: Introductionmentioning

confidence: 99%

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Influence of sintering temperature on the interfacial behavior of Ti₃Al(Si)C₂ ceramic and Ti6Al4V alloy

et al. 2022

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MAX phases possess a combination of ceramic and metallic characteristics, exhibiting good mechanical properties, high thermal conductivity, high thermal stability, and corrosion resistance. To apply MAX phases containing Ti and Al in the casting process of titanium alloy to improve the alloy properties, the interfacial behaviors between pre-sintered Ti 3 Al(Si)C 2 substrates and molten Ti6Al4V alloy were investigated. The results indicated that Ti 3 Al(Si)C 2 substrates, presintered at 1100 • C, exhibited better resistance to the penetration of alloy than those at 1300 and 1500 • C. The reason was that the pre-sintering temperature was a dynamics factor affecting the reaction of the Ti 3 Al(Si)C 2 substrates in a graphite bed to generate titanium carbide. When the pre-sintering temperature was 1100 • C, the reaction was weak and a small amount of carbon was introduced into the pre-sintered Ti 3 Al(Si)C 2 substrates, which led to a low concentration gradient of Ti between the alloy and the substrates. The low concentration gradient slowed the diffusion speed of the alloy toward the substrates. Besides, remarkable V/Si lines were detected between the alloy and Ti 3 Al(Si)C 2 substrates for all tested samples. The interface reaction between pre-sintered Ti 3 Al(Si)C 2 samples and Ti6Al4V alloy was mainly controlled by the diffusion of V because of its inherent segregation effect. The penetration depths of V into substrates were 0.643, 1.135, and 1.324 mm corresponding to Ti 3 Al(Si)C 2 samples pre-sintered at 1100, 1300, and 1500 • C, respectively. That was attributed to the reaction product (Ti, V) 5 Si 3 playing a positive role in diffusion barrier behavior.

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