A new method to prepare composite powders customized for high temperature laser sintering

Abstract

Composites have the potential to enhance the mechanical properties of components fabricated by additive manufacturing; however, the bottleneck is the limited number of polymeric composite powders available for this manufacturing process. This paper describes a generically new method to create composite powders that are suitable for High Temperature Laser Sintering (HT-LS). C-coated Inorganic Fullerene-like WS 2 (IF-WS 2 ) nanoparticles and graphene nanoplatelets (GNPs) have been chosen to demonstrate their incorporation into a high performance polymer matrix: Poly Ether Ether Ketone (PEEK). The morphological and physical property investigations have confirmed that the resulting composite powders exhibit the desired particle morphology, size, distribution and flowability for HT-LS applications. Further preliminary sintering results have demonstrated that they are comparable to the currently available commercial grade of PEEK powder HT-LS applications in terms of powder packing properties and flow ability. The new strategy reported here brings in great potential for the additive layer manufacturing of high performance polymeric composite components with improved mechanical and added functionalities by choosing the proper matrix and filler combination.

The service life increasing of agricultural machinery products by electro-acoustic spraying

“…Numerous experiments conducted with the usage of various base crystals and surface films (both oxide [1,2] and metal [3]) confirmed in most cases the effect having been found by Rosky. It also turned out that surface films significantly reduce the creep rate of single crystals [4].…”

“…The double barrier created by electroacoustic spraying prevents reaching dislocations on the surface. The conclusion about the barrier mechanism of influence is confirmed by numerous experiments conducted using various base crystals and applied surface layers (both oxide [1,2] and metal [3,11]). in most cases, the found effect by Rossky was confirmed.…”

Chemically activated core–shell structured IF-WS2@C nanoparticles enhance sugarcane-based carbon/epoxy nanocomposites

“…These thin graphite coatings correspond to the weak peak at 26.6° obtained in the XRD pattern; the graphite coating enabled the thermal stability and thermal conductivity. 36 …”

“…These thin graphite coatings correspond to the weak peak at 26.6 obtained in the XRD pattern; the graphite coating enabled the thermal stability and thermal conductivity. 36 SEM images of IF-WS 2 @C SCPs, and the fracture morphology of composites are displayed in Fig. 4.…”

The service life increasing of bushings by electro-acoustic spraying

“…In most works devoted to the study of the erosion characteristics of metals under the action of pulsed low-voltage discharges in a liquid dielectric medium, the pulse energy and duration are considered as the main parameters of the pulses that determine the erosion characteristics [2,3].…”