Materials and Processing of Hollow glass powder
The matrix material PA2200, with an average particle size of 60μm and a white appearance, was obtained from EOS GmbH in Germany. Moreover, the mixing ratio of new and old powder is 1:1. Filler additives, Hollow glass powder was surface treated with silane coupling agent supplied by The Minnesota Mining and Manufacturing(3M) Company in the USA. As an inorganic material, Hollow glass powders have no polarity and poor compatibility with PA2200. Thus, the mechanical properties of sintered parts of PA2200 and untreated HGM composite will greatly decrease. The silane coupling agent is soluble in water and plays a coupling role that bridges between inorganic and polymer. Therefore, to improve the interface bonding between HGM and polyamide, a silane coupling agent is commonly used to modify HGM. After drying, Hollow glass powders were sieved by Auspack-und Siebstation P1/P3 sieving machine of EOS to obtain a uniform size. Fillers were added to PA2200 in 0, 15, and 30% w/w ratios. PA2200/HGB composites were mixed and ground for 10-12 hours at a rotating speed of 1000-1200 R/min in the XHS-50KG high-speed mixer of Ningbo Beilun Tongsheng Machinery Manufacturing Company. Three kinds of PA2200/HGM composites were used, containing 0, 15, and 30 wt.% HGM, respectively. Hereafter, these materials are referred to as PA2200, PH-1, and PH-2, respectively. All of the specimens tested were manufactured through the Selective Laser Sintering (SLS) process in an EOS P396 Machine: continuous wave CO2 laser with a maximum power of 55W, a wavelength of 10.6μm, a laser spot diameter of 0.4mm, vibration mirror type laser scanning system, the maximum scanning speed of 5000mm/s, working cabin size of 340×340×600mm, powder feeding mode of the double cylinder. As is well known, SLS's sintering process parameters significantly influence the outcoming samples' geometry and mechanical properties. If you are looking for high quality, high purity, and cost-effective Hollow glass powder, or if you require the latest price of Hollow glass powder, please feel free to email contact mis-asia.