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

Microstructural Development and Mechanical Properties of Selective Laser Melted Co–Cr–W Dental Alloy
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选择性激光熔化 CoâCrâW 牙科合金的微观结构发展和机械性能

DOI:
10.1007/978-3-030-36296-6_18
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Werner E.
Werner E.
中科院分区:
--
文献类型:
--
作者:
Hitzler L;Von Kobylinski J;Lawitzki R;Krempaszky C;Werner E.

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由于所需的快速制造、低数量和几何设计的自由度,牙科增材制造是一个注定的领域。过去的研究表明,与传统的熔模铸造相比,微结构存在显着差异,对材料性能产生了重大影响。在许多情况下,这些变化是有益的,即更高的机械强度和增加的延展性,但弹性刚度降低。后者对于5型分类至关重要,并且基于对选择性激光熔化的Co-Cr-W牙科合金的研究,后热处理不可避免地安全超过150 GPa的最低要求。在1150 °C下热处理引起再结晶并形成富钨沉淀物,所述富钨沉淀物被贫钨钴铬合金包围。 矩阵在热处理状态下,该合金表现出半各向同性拉伸性能,平均杨氏模量约为200 GPa,安全地满足牙型2至5分类。
Dental restorations are a predestined area for additive manufacturing , due to the required fast fabrication , the low quantities, and the freedom in geometrical designs. Past studies revealed that there is a significant difference in the microstructure compared to traditional investment cast restorations, with drastic implications on the material properties . In many instances, these changes are beneficial, i.e. higher mechanical strength and increased ductility, but at a reduced elastic stiffness . The latter is crucial for the type 5 classification and, based on the studies on a selective laser melted Co–Cr–W dental alloy , a post-heat treatment is inevitable to safely exceed the 150 GPa minimum requirement. Heat treatment at 1150 °C caused a recrystallization and a formation of tungsten rich precipitates, surrounded by a tungsten depleted cobalt–chromium matrix. In the heat-treated state, the alloy exhibited semi-isotropic tensile properties with an average Young’s modulus of about 200 GPa, safely meeting the dental type 2 to 5 classifications.
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