Microstructural Development and Mechanical Properties of Selective Laser Melted Co–Cr–W Dental Alloy

Hitzler, Leonhard; Kobylinski, Jonas von; Lawitzki, Robert; Krempaszky, Christian; Werner, Ewald

doi:10.1007/978-3-030-36296-6_18

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…[114] However, these alloys are more embrittlement-susceptible due to the oxygen dissolution caused by the oxygen diffusion into titanium which is introduced during fabrication/heat treatment. In addition, their higher cost have led to their substitution with cobalt-based alloys [115].…”

Section: Titanium and Its Alloysmentioning

confidence: 99%

3D and 4D printing in dentistry and maxillofacial surgery: Printing techniques, materials, and applications

et al. 2021

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Section: Titanium and Its Alloysmentioning

confidence: 99%

3D and 4D printing in dentistry and maxillofacial surgery: Printing techniques, materials, and applications

et al. 2021

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“…ISO 22674 standardında tanımlanan her bir alaşımın mekanik özelliği 8 ve mikroyapısı birbirinden farklıdır. 10 Co-Cr alaşımlarının mikroyapısı hekzagonal sıkı paket (HSP) ve yüz merkezli kübik (YMK) fazlardan ve Standard Tessellation Language (STL) dosyası formatında kaydedildi. STL dosyası kopyalanarak bir bilgisayar destekli üretim (Cambridge, 3Shape, Kopenhag Danimarka) programında sanal tablaya yerleştirilip üretim dosyası oluşturuldu ve SLE makinesine (Lazer Spot Çapı 55 µm, TruPrint 1000, Trumpf, Ditzingen, Almanya) aktarıldı.…”

Section: Introductionunclassified

The Effect of Alloy Type on Metal-Ceramic Bond Strength of Co-Cr Frameworks Fabricated by Selective Laser melting.

ALBAYRAK,

YAPRAK,

EKİCİ

2024

ADO Klinik Bilimler Dergisi

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Amaç: Bu çalışma, seçici lazer ergitme (SLE) yönteminde kullanılan Co-Cr alaşım tozlarının metal-seramik (MS) bağlantı dayanımı üzerine alaşım tipinin etkisini değerlendirmeyi amaçlamıştır. Gereç ve Yöntem: Otuz adet bar şekilli Co-Cr metal altyapı, çekirdek metal(n=10, Grup-D) kullanarak döküm yöntemi ile, tip 4 (n=10, Grup-T4) ve tip 5 (n=10, Grup-T5) alaşım tozu kullanarak SLE yöntemi ile üretildi. Çekirdek metal ve alaşım tozlarının mikro yapısı X-ışını diffraksiyon (XRD) yöntemi ile incelendi. Tüm metal altyapıların merkezine feldspatik porselen uygulandı ve fırınlandı. Tüm numunelerin MS bağlantı dayanımı(MPa) 3 nokta bükülme testi ile ölçüldü. MS bağlantı dayanımı verileri, tek yönlü varyans analizi ve Tamhane T2 post hoc testi (α=0.05) kullanılarak analiz edilmiştir. Her gruptan iki numunenin kırık metal-seramik arayüzü enerji dağılımlı X-ışını spektroskopisi ve stereo mikroskop kullanılarak incelendi. Bulgular: Grup-T5 (25.62 ±2.02) Grup-D (37.28 ± 4.46; P=0.000016) ve grup T4’den (32.82 ± 2.85; P=0.00019) anlamlı derecede daha düşük MS bağlantı dayanımı göstermiştir. Bükme testi sonrasında metal ara yüzeyindeki porselen kalıntısının miktarı en fazla Grup D'de, en az Grup-T5’de olduğu doğrulandı. Sonuç: Bu çalışmanın bulguları alaşım tipinin, SLE kullanılarak üretilen altyapıların MS bağlantı dayanımını etkileyebileceğini göstermiştir.

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“…On the macro-scale, these result in a homogenization and an increase in mechanical properties, in particular, the Young's modulus [10]. On the micro-scale, multiple mechanisms like the γ-to-phase transformation, precipitation, recovery, residual stress relieve, recrystallization, and grain growth are activated by the HT [18][19][20]. Some of these mechanisms can affect the performance of dental frameworks adversely, which is the reason why the parameters of the HT have to be optimized with regard to the stated requirements.…”

Section: Introductionmentioning

confidence: 99%

In-Situ XRD Study of Phase Transformation Kinetics in a Co-Cr-W-Alloy Manufactured by Laser Powder-Bed Fusion

et al. 2021

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The additive manufacturing process of laser powder-bed fusion (L-PBF) is an increasingly popular approach for patient-specific production of dental frameworks made from Co-Cr alloys. Macroscopically, frameworks produced in this way exhibit high anisotropy especially in Young’s modulus, and are missing standardized requirements. Microscopically, pronounced texture and high residual stresses are characteristic. To reduce resulting detrimental effects, the as-built (AB) parts are heat treated. Dependent on the treatment temperature, effects like the transformation of the γ-phase matrix in the AB condition to ϵ-phase, precipitation, stress relief, and grain growth were observed. While the existence of these processes was established in the past, little is known about their kinetics. To fill this gap, these effects were studied with in-situ X-ray diffraction (XRD) methods in isothermal heat treatments (HTs) at four different sample surface temperatures TS reaching from 650∘C to 900∘C. Furthermore, room temperature ex situ XRD and SEM/EDS measurements completed the analysis. An evaluation of the datasets, with single peak fitting and QXRD methods, yielded the following results. In the HTs below a certain threshold, a γ-to-ϵ transformation was observed in the sample bulk and close to the sample surface. In the latter case, evidence for a partially strain-induced transformation related to oxide formation was present. Above this threshold and possibly slightly below, σ- and Laves-phase precipitated. Additionally, peak profile evolutions hinted at a drop of inter- and intragranular stresses within the first 30 to 60 min. Therefore, an HT of about 30 to 60 min slightly above the threshold is proposed as optimal for reducing residual stresses while retaining a predominantly single-phased microstructure, possibly superior in corrosion properties and likewise in bio-compatibility.

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Microstructural Development and Mechanical Properties of Selective Laser Melted Co–Cr–W Dental Alloy

Cited by 3 publications

References 12 publications

3D and 4D printing in dentistry and maxillofacial surgery: Printing techniques, materials, and applications

3D and 4D printing in dentistry and maxillofacial surgery: Printing techniques, materials, and applications

The Effect of Alloy Type on Metal-Ceramic Bond Strength of Co-Cr Frameworks Fabricated by Selective Laser melting.

In-Situ XRD Study of Phase Transformation Kinetics in a Co-Cr-W-Alloy Manufactured by Laser Powder-Bed Fusion

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