澳门新莆京游戏(中国)官方网站-Limited Company

High quality spherical alloy powder is an important guarantee for high performance metal additive manufacturing. The composition, oxygen content and powder physical properties (morphology, particle size distribution, powder fluidity, loose density, etc.) are very important to the stability of 3D printing forming process and the physical and chemical properties, affect and determine whether the products can be installed and applied.

Among lots of powder technical indicators, the powder spherical and satellite ball ratio directly affect the fluidity and apparent density of the powder. Low powder spherical or high satellite ball ratio directly affect the quality of powder delivery or paving, and then affect the quality of printing parts and produce internal and surface defects. In recent years, as additive manufacturing technology matures, The demand for efficient forming of complex components and large parts is increasing,additive manufacturing smart factory also emerged,but limited by the lower powder mode in the equipment operation cannot add powder online, since it’s easy to produce step connection and metallurgical defects when the silo is opened and powder is added, so the international mainstream large-size equipment usually use feed type continuous feed powder system. The way of feeding powder has high requirements on the liquidity of the powder. If the powder liquidity is not good and causes uneven powder falling, or lumps and bumps in the process of powder laying, it will have a bad impact on the printing quality. In the future, the demand of metal additive manufacturing for high liquid powder will become increasingly obvious.

Physical properties of High-fluidity AlSi10Mg powder

Microscopic morphology of 3D printed sample

High-fluidity AlSi10Mg powder is used to prepare 3D printed test blocks, and observe the transverse and longitudinal microscopic morphology of the morphed metallographic blocks (FIG. 3). Occasionally see small holes, no large pores, the overall density is high.

Density of 3D printed samples

The density of 3D printed samples was tested by drainage method. The density difference of different size samples printed by high fluidity aluminum alloy powder is small and the uniformity is good.

Mechanical Property

The 3D printed high fluidity test bar was tensile tested after stress removal annealing. Test results are shown in Table 3.

 

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