Dense yttria-stabilized zirconia obtained by direct selective laser sintering
Dense yttria-stabilized zirconia obtained by direct selective laser sintering
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DOI：
10.1016/j.addma.2018.02.005
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发表时间：
2018-05-01
影响因子：
11
通讯作者：
Lenormand, Pascal
中科院分区：
文献类型：
--
作者：
Ferrage, Loic;Bertrand, Ghislaine;Lenormand, Pascal
这项工作证明了使用商用3D SYSTEMS机器通过直接激光束烧结制造致密氧化钇稳定氧化锆（YSZ）部件的可能性。要实现这一点，必须满足过程本身的几个要求。首先，必须实现有效的激光-物质相互作用。事实上，要克服的一个主要问题是YSZ粉末在Nd:YAG激光波长下的固有非吸光度特性。这个问题是通过在YSZ粉末中加入少量石墨来解决的，从而使两种化合物进行简单的机械混合。石墨连接允许将吸光度值从2%增加到大约60%。粉末混合物的化学成分和密度以及在这项工作中使用的起始材料的粒度分布，由于适当的热物理性质，可以实现充分的热传递。最后，通过实验确定了一组允许制造具有高相对密度，良好几何精度和机械强度的零件的机器参数。最终，发现直接SLS可以重复制造相对密度为96.5%的简单YSZ零件。
This work demonstrated the possibility to manufacture dense yttria-stabilized zirconia (YSZ) parts by direct laser beam sintering using a commercial 3D SYSTEMS machine. To achieve this, several requirements of the process itself had to be met. First, an efficient laser-matter interaction had to be achieved. Indeed, a major issue to overcome was the intrinsic nonabsorbance property of the YSZ powder at the Nd:YAG laser wavelength. This issue was solved by adding a small amount of graphite to the YSZ powder that resulted in a simple mechanical blending of the two compounds. The graphite adjunction allowed an increase in the absorbance value from 2% to approximately 60%. The chemical composition of the powder blend and the density and the particle size distribution of the starting material used in this work enabled adequate heat transfers due to the appropriate thermophysical properties. Finally, a set of machine parameters that allows to manufacture parts with a high relative density, good geometrical accuracy, and mechanical strength was experimentally determined. Ultimately, it was found that the direct SLS allows the reproducible manufacture of simple YSZ parts with a relative density of 96.5%.