Interaction between the Ceramic CaZrO&lt;sub&gt;3&lt;/sub&gt; and the Melt of Titanium Alloys

Li, Chong He; Gao, Yaohui; Lu, Xiong Gang; Ding, Wei; Ren, Zhong; Deng, Kang

doi:10.4028/www.scientific.net/ast.70.136

Cited by 16 publications

(12 citation statements)

References 6 publications

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“…This result indicates that CaZrO 3 was in a stable phase and it was not significantly dissolved in Ti. Furthermore, Lin et al [25] studied CaZrO 3 as a crucible for Ti-6Al-4V (or TC4) and TiNi-alloy based melts material. Small amount of Ca, Zr, Ti and Ni diffused to the original interfacial reaction layer, indicating that CaZrO 3 has a promising performance and a very good refractory resistance [25].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Lin et al [25] studied CaZrO 3 as a crucible for Ti-6Al-4V (or TC4) and TiNi-alloy based melts material. Small amount of Ca, Zr, Ti and Ni diffused to the original interfacial reaction layer, indicating that CaZrO 3 has a promising performance and a very good refractory resistance [25]. In Schafföner et al study [26], CaZrO 3 crucible was able to withstand Ti-6Al-4V and TiAl melts, thereby not exhibiting any form of cracking due to the low thermal shock resistance.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the interactions between titanium and calcium zirconium oxide (CaZrO3) ceramics modified with alumina

Lin

2019

PAC

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Powdered mixtures of CaO, ZrO 2 and Al 2 O 3 in various ratios were hot pressed. The mixtures reacted with titanium at 1600°C for 30 min in argon to evaluate the suitable ceramic crucibles for casting of titanium. The interfacial microstructures between titanium and ceramic composites were characterized using X-ray diffractometer, scanning and transmission electron microscope. The produced hot pressed mixtures that were chemically bonded together, contained calcium aluminate (CaAl 2 O 4 ), calcium dialuminate (CaAl 4 O 7 ), cubic zirconia (c-ZrO 2 ), and calcium zirconium oxide (CaZrO 3 ). The increase in Al 2 O 3 amount led to the decrease in CaZrO 3 amount and an increase in the amount of CaAl 2 O 4 , CaAl 4 O 7 and c-ZrO 2 due to the reaction of CaO and Al 2 O 3 . At the end of the reaction of the ceramic mixtures with Ti at 1600°C for 30 min, the acicular α-Ti and β ′ -Ti were formed at the interface of Ti and the composites containing up to 10 vol.% Al 2 O 3 . In composites containing more than 20 vol.% Al 2 O 3 , Ti 3 Al 5 was found at the interface instead of α-Ti and β ′ -Ti. Furthermore, CaZrO 3 , ZrO 2 and Ca 3 Al 2 O 6 existed on the sides of the ceramic far away from the interface. CaZrO 3 /Al 2 O 3 composites with less than 20 vol.% Al 2 O 3 could be a potential crucible or mould material for productive applications in titanium casting.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the interactions between titanium and calcium zirconium oxide (CaZrO3) ceramics modified with alumina

Lin

2019

PAC

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“…Hence CaZrO 3 is a potential facecoat material for casting titanium and its alloys. Later, Li [16] developed a CaZrO 3 crucible by sintering a ZrO 2 and CaO powders (CaO: ZrO 2 ¼ 1:1). In Li's study, an approximate 350 mm interaction layer thickness was detected at the Tie6Ale4V (Ti64) alloy surface with some oxides apparent.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the use of CaZrO3 as a facecoat material in the investment casting of TiAl alloys

Yuan

Cheng

Withey

2015

Materials Chemistry and Physics

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h i g h l i g h t sTo determine the interactions between CaZrO 3 filler and stucco materials during shell firing.To study the reaction between the CaZrO 3 facecoat and TiAl alloy during casting. The Al 2 O 3 stucco can react with CaZrO 3 filler to form (Zr, Ca)O 2 and CaAl x O y at 1650 C. O, Zr and Si ions from the ceramic moulds were observed to penetrate into the TiAl metal. The reaction products include (Ti, Zr) 5 (Al, Si) 3 and ZrAl 2 phase with high Ti ions solid solution. a b s t r a c tResearch was carried out to determine the interactions between the filler and stucco materials in CaZrO 3 based facecoats during shell firing as well as between the facecoat and a TiAl alloy during the casting process. A 'flash re-melting' technique, which gives a similar heating profile to the actual investment casting process, was used to study the phase transformations in the shell moulds. The chemical inertness of the facecoat was then investigated using a sessile drop test using a Tie45Ale2Nbe2Mne0.2TiB alloy. In this study, the facecoat compositions and the interaction products between metal and shells were characterized using x-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A severe interaction was found between CaZrO 3 filler and Al 2 O 3 stucco, which rapidly damaged the shell surface. As well as oxygen, zirconium and silicon ions from the shell moulds were also observed to penetrate into the TiAl metal to form (Ti, Zr) 5 (Al, Si) 3 phases in the metal/shell interfacial areas.

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“…Even though the casting method using refractory containing TiAl-based alloy melt inevitably brings about the problem of foreign element contamination, considering its cheap cost, simple operation, advantages of ensuring melt chemical homogeneity, ability to maintain melt superheat as well as industrial-scale production capacity, which remains an extremely commercially promising approach. For this reason, in the past two decades, various refractories such as oxides (Al2O3, CaO, ZrO2, Y2O3, CaZrO3, BaZrO3) [12][13][14][15][16][17][18], carbides (graphite) [19], nitrides (AlN) [20], silicide (Mullite, SiO2) [17,21] and boride (BN) [20] have been extensively evaluated, and two kinds of refractories, Y2O3 and BaZrO3, are currently used successfully. Our research group has done a lot of work on BaZrO3 series perovskite refractories used in Ti alloys melting, and the results show that BaZrO3 series perovskite refractories have excellent corrosion resistance to Ti alloy melt [15,16,22,23].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ti-46Al-8Nb Alloy Ingots beyond Laboratory Scale Based on BaZrO3 Refractory Crucible

Duan¹,

Mao²,

Yang³

et al. 2022

Preprint

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The high Nb-containing TiAl-based alloy ingot beyond laboratory scale with a composition of Ti-46Al-8Nb (at. %) was prepared by a vacuum induction melting process based on BaZrO3 refractory. An ingot without macroscopic casting defects (such as pipe shrinkage and center line porosity) was finally obtained, and the chemical composition, solidification path, microstructure and tensile properties of the ingots were investigated. The results show that the deviations of Al and Nb content along a 430 mm long central part of the ingot are approximately \mathrm{\pm}0.39 at. % and \mathrm{\pm}0.14 at. %, and the oxygen content in the ingot can be controlled at around 1000 ppm. During the solidification process, the alloy suffered from peritectic reaction and formed columnar grains with anisotropy. In addition to Al segregation and Nb segregation, β-phase particles associated with γ phase at the triple junction of the colonies were observed. Moreover, the mechanical properties of the ingot in the transverse direction are significantly better than those in the longitudinal direction, with a tensile strength of up to high as 700 MPa and a corresponding fracture elongation of 1.1 %.

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Interaction between the Ceramic CaZrO<sub>3</sub> and the Melt of Titanium Alloys

Cited by 16 publications

References 6 publications

Investigation of the interactions between titanium and calcium zirconium oxide (CaZrO3) ceramics modified with alumina

Investigation of the interactions between titanium and calcium zirconium oxide (CaZrO3) ceramics modified with alumina

Investigation into the use of CaZrO3 as a facecoat material in the investment casting of TiAl alloys

Preparation of Ti-46Al-8Nb Alloy Ingots beyond Laboratory Scale Based on BaZrO3 Refractory Crucible

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