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Study on the indirect selective laser sintering (SLS) of WC-Co/PA12 powders for the manufacturing of cemented carbide parts
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2021-02-02 , DOI: 10.1016/j.ijrmhm.2021.105498
O.D. Jucan , R.V. Gădălean , H.F. Chicinaş , M. Hering , N. Bâlc , C.O. Popa

A new approach for the manufacturing of cemented carbide parts with a high degree of complexity via indirect selective laser sintering (SLS), using commercial WC-12Co with different amounts of polyamide (PA12) and using low-cost standard equipment is proposed. After debinding, vacuum sintering and sinter-HIP at 1400 °C with 50 bar Ar of the green specimens, the samples showed low relative densities in the range of 60–66%, while the shrinkage after sintering ranged between 35% and 42%, being constant within the volume. This method enables the production of complex shape parts which retained their shape even with respect to the cooling channels after sintering, showing good surface quality and geometry definition. The 3D scan of a WC-12Co end mill sample with 20% PA12 showed low dimensional deviation compared to the 3D model (.stl), proving the capability of the SLS to manufacture near-net-shape cemented carbide parts. The obtained results are indicating that, by adopting a better suited WC-Co powder, indirect SLS followed by Sinter-HIP, can become an interesting method for the Additive Manufacturing of complex cemented carbide parts.



中文翻译:

硬质合金零件制造中WC-Co / PA12粉末的间接选择性激光烧结(SLS)研究

提出了一种通过间接选择性激光烧结(SLS),使用商业量的WC-12Co和不同量的聚酰胺(PA12)并使用低成本标准设备来制造具有高度复杂性的硬质合金零件的新方法。经过脱脂,真空烧结和在1400°C下用50 bar Ar的绿色试样进行HIP烧结,样品的相对密度较低,在60-66%的范围内,而烧结后的收缩率在35%至42%之间,在体积内保持恒定。该方法使得能够制造复杂形状的零件,该零件即使在烧结后相对于冷却通道也能保持其形状,从而显示出良好的表面质量和几何形状。与3D模型(.stl)相比,对含20%PA12的WC-12Co立铣刀样品的3D扫描显示出较低的尺寸偏差,证明了SLS能够制造近净形硬质合金零件。所得结果表明,通过采用更适合的WC-Co粉末,间接SLS继之以Sinter-HIP,可以成为用于复杂硬质合金零件增材制造的有趣方法。

更新日期:2021-02-05
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