Purpose

The purpose of this paper is to eliminate Part defects and enrich additive manufacturing of ceramics. Laser powder bed fusion (L-PBF) experiments were carried to investigate the effects of laser parameters and selective oxidation of Titanium (mixed with TiO₂) on the microstructure, surface quality and melting state of Titania. The causes of several L-PBF parts defects were thoroughly analyzed.

Design/methodology/approach

Laser power and scanning speed were varied within a specific range (50–125 W and 170–200 mm/s, respectively). Furthermore, varying loads of Ti (1%, 3%, 5% and 15%) were mixed with TiO₂, which was selectively oxidized with laser beam in the presence of oxygen environment.

Findings

Part defects such as cracks, pores and uneven grains growth were widely reduced in TiO₂ L-PBF specimens. Increasing the laser power and decreasing the scanning speed shown significant improvements in the surface morphology of TiO₂ ceramics. The amount of Ti material was fully melted and simultaneously changed into TiO₂ by the application of the laser beam. The selective oxidation of Ti material also improved the melting condition, microstructure and surface quality of the specimens.

Originality/value

TiO₂ ceramic specimens were produced through L-PBF process. Increasing the laser power and decreasing the scanning speed is an effective way to sufficiently melt the powders and reduce parts defects. Selective oxidation of Ti by a high power laser beam approach was used to improve the manufacturability of TiO₂ specimens.

中文翻译：

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激光参数和Ti含量对L-PBF制备的二氧化钛表面形貌的影响

目的

本文的目的是消除零件缺陷并丰富陶瓷的增材制造。进行了激光粉末床熔融（L-PBF）实验，研究了激光参数和钛（与TiO ₂混合）选择性氧化对钛的微观结构，表面质量和熔融状态的影响。彻底分析了多个L-PBF零件缺陷的原因。

设计/方法/方法

激光功率和扫描速度在特定范围内变化（分别为50-125 W和170-200 mm / s）。此外，将各种负载的钛（1％，3％，5％和15％）与TiO ₂混合，然后在有氧环境下用激光束将其选择性氧化。

发现

在TiO ₂ L-PBF样品中，诸如裂纹，气孔和晶粒不均匀生长等零件缺陷得到了大大减少。增加激光功率和降低扫描速度显示出TiO ₂陶瓷表面形态的显着改善。钛材料完全熔化，并通过施加激光束同时转变为TiO ₂。钛材料的选择性氧化还改善了样品的熔化条件，微观结构和表面质量。

创意/价值

通过L-PBF工艺制备了TiO ₂陶瓷样品。增加激光功率和降低扫描速度是充分熔化粉末并减少零件缺陷的有效方法。通过大功率激光束方法对Ti进行选择性氧化，以改善TiO ₂样品的可制造性。