Dependence of SLS Parameters on Thermal Properties of Composite Material of Cement with Polyamide 12

Sa Aldahsh

doi:10.4172/2168-9873.1000130

Abstract

SLS employs powder-processing in the construction of parts and SLS parameters depending on the thermal properties of the powder. An average of 80% to 90% of the powder in the build chamber is not sintered during the SLS process and could be reused in relation to its properties. However, the properties of un-sintered powder deterioratedue to exposure to a various temperature for extended periods of time during the SLS system material build-processin three stages, starting from warm up stage, the build stage, where the powder is exposed to just below the melting point of the material, and the cool-down stage. An experimental study of the thermal properties of composite material of cement and PA12 to determine the optimum parameters of SLS process are being investigated. The investigationuses the thermal properties of different proportions of composite material of cement and PA12. In addition, an experimental study of the thermal properties and physical properties of used or un-sintering powder to expand a methodology of controlling the SLS parameters, in turn to obtain consistent, good quality fabricated SLS specimens. ``

Highlights

One of the most common of Rapid Prototyping (RP) techniques exist is Selective Laser Sintering (SLS) which is capable of producing very complex part-geometry directly from three-dimensional CAD software
This paper presents a theoretical and experimental study of composite material of cement and PA12 powder properties as the thermal, the molecular weight, additives, properties of different proportion of composite material of cement and PA12 of the powder
The molecular weight and Tm, Tg and Tc of cement/ PA12 composite are not affected via different proportions of cement added to the Polyamide 12

Summary

Introduction

One of the most common of Rapid Prototyping (RP) techniques exist is Selective Laser Sintering (SLS) which is capable of producing very complex part-geometry directly from three-dimensional CAD software. Build parameters and guidance of the laser are controlled by the data which is processed by a computer system. The computer system is used to control nitrogen which creates an inert atmosphere to eliminate the possibility of powder oxidation and explosion. This is followed by heating the powder to a temperature just below the melting point of the material using a heater which is located above the part-bed, in order to minimize thermal distortion and heat stress to the lowest possible degree; prevent the fabrication part from warping and facilitate fusion to the previous layer. The speed of the roller transverse is an adjustable machine parameter [2,3]

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Results

Conclusion