A study on selective laser sintering behaviour and processing of polymer powder mixtures

Ng, Rui Ying (2019) A study on selective laser sintering behaviour and processing of polymer powder mixtures. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

	Text (24 Pages) A Study On Selective Laser Sintering Behaviour And Processing Of Polymer Powder Mixtures.pdf - Submitted Version Download (304kB)
	Text (Full Text) A study on selective laser sintering behaviour and processing of polymer powder mixtures.pdf - Submitted Version Restricted to Registered users only Download (995kB)

Abstract

Selective Laser Sintering (SLS), one of the binding mechanisms of additive manufacturing capable in fabricating high complexity parts with complicated geometries had gain its bonus over conventional manufacturing approach. However, most powder is unsintered but undergo high temperature along the building and cooling cycle resulting in degradation of material properties. 3 different composition of Polyamide (PA) 12 powder, (i)commercial, (ii)recycled, (iii)mixed composition of commercial, recycled and reheated powder with ratio 2:2:1 is studied on the rheology through rheometer and specimens of respective materials is fabricated through SLS process. Surface morphology of the cross-sectional area of specimen’s part and dimensional accuracy of various profiles of specimens includes length, angle and thickness are studied by using SEM and CMM respectively. Analysis results showed that the specimens of recycled PA12 has the most deviations in average for all profile from the desired dimension and possess highest viscosity among the three samples. Images from SEM showed cavity and porosity in the cross-sectional area of the specimens for recycled PA 12 explained the observation of highest apparent viscosity of the recycled PA 12 among the three samples which resist the melt flow is a factor of the deviations in parts dimension. Mixed composition of PA 12 results in similar but slightly higher viscosity than the commercial PA 12 showed better material properties than the recycled material. Recycling waste PA 12 from SLS process can contribute to economical target but need to be mixed with an appropriate ratio of new material to achieve parts quality performance.

Actions (login required)

View Item