Development of new polyimide powder for selective laser sintering
- PDF / 611,256 Bytes
- 8 Pages / 584.957 x 782.986 pts Page_size
- 4 Downloads / 218 Views
Development of new polyimide powder for selective laser sintering Gleb Vaganov1,a), Andrey Didenko1, Elena Ivan’kova1, Elena Popova1, Vladimir Yudin1, Vladimir Elokhovskii1, Irena Lasota2 1
Laboratory of Polymer Mechanics and Composite Materials, Institute of Macromolecular Compounds Russian Academy of Science, St. Petersburg 199004, Russia 2 Department of Research and Development in the field of Laser and Hybrid Laser-Arc Technology, Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg 195251, Russia a) Address all correspondence to this author. e-mail: [email protected] Received: 31 January 2019; accepted: 18 April 2019
A comparative study of properties of the films based on polyimide powders synthesized by chemical or thermal imidization is presented. It is shown that the imidization method affects the shape, size, bulk density, and size distribution of the synthesized polyimide powder particles, which influences the properties of the films obtained. The method of chemical modification allows to obtain denser powders comparing to the thermally imidized powder. The films were obtained with the help of selective laser sintering (SLS) for the first time. It is shown that the films produced by SLS from chemically imidized polyimide powder are more dense and monolithic as compared to those made from thermally imidized polyimide, which provides, obviously, higher mechanical characteristics of the former. They have the strength higher in 2.5 times and the elastic modulus twice as high than latter one. The optimal laser power is 65 W.
Introduction The additive technology or layer-by-layer creation of materials is increasing in importance. This is the creation of a computer model of the future part and the receipt of the product itself by adding material on a layer-by-layer basis using special equipment [1]. One of the most promising representatives of additive technology for obtaining high-quality products from metals, their alloys, ceramics, and polymers is a technology based on the growth of work pieces and parts using the selective laser sintering (SLS). The principle of the products formation by this technology consists in the layer-by-layer growing of the product followed by sintering the powder material. As a result, it is possible to obtain parts of complex shape, which are simply impossible to manufacture using conventional casting methods. The use of such new methods helps to reduce material consumption and increase productivity [1]. The main advantages of SLS over other technologies of additive production are the following [2]: (i) products produced by the SLS method are similar in properties of polymeric materials obtained using standard methods such as extrusion, injection molding, and hot pressing; (ii) theoretically, any
ª Materials Research Society 2019
material that can be transferred in a powder state and melted at increasing temperature can be processed using SLS technology; (iii) the absence of any additional supporting element when printing complex products. The properties of the fin
Data Loading...
