TY - JOUR
T1 - Morphology and properties of selective laser sintered bisphenol a polycarbonate
AU - Ho, Henry Chung Hong
AU - Cheung, Wai Lam
AU - Gibson, Ian
PY - 2003/4/30
Y1 - 2003/4/30
N2 - Selective laser sintering (SLS) was used to process bisphenol A polycarbonate (PC) powder. The effects of the energy density of the laser beam (ranging from 0.036 to 0.12 J/mm2) on the morphology and physical and tensile properties of the sintered specimens were investigated. In general, high energy density of the laser beam resulted in better fusion of the PC particles and enabled a more compact structure to be built. When the energy density became excessively high, however, severe degradation of the polymer occurred, leading to the evolution of gases and a reduction in the molecular weight. Consequently, the physical density and tensile strength of the sintered specimens decreased, and the surface roughened. The tensile strength of the specimens was closely related to the physical density, and anisotropy was observed along different loading directions. Bonus Z increased rapidly during sintering of the first few layers and then gradually during sintering of the subsequent layers. Curling of the sintered specimens became severe at high energy density, and cracking was observed on the bases of multilayered specimens as a result of the excessive accumulation of residual tensile stresses. this work forms a basis for the production of selective laser sintered PC functional parts.
AB - Selective laser sintering (SLS) was used to process bisphenol A polycarbonate (PC) powder. The effects of the energy density of the laser beam (ranging from 0.036 to 0.12 J/mm2) on the morphology and physical and tensile properties of the sintered specimens were investigated. In general, high energy density of the laser beam resulted in better fusion of the PC particles and enabled a more compact structure to be built. When the energy density became excessively high, however, severe degradation of the polymer occurred, leading to the evolution of gases and a reduction in the molecular weight. Consequently, the physical density and tensile strength of the sintered specimens decreased, and the surface roughened. The tensile strength of the specimens was closely related to the physical density, and anisotropy was observed along different loading directions. Bonus Z increased rapidly during sintering of the first few layers and then gradually during sintering of the subsequent layers. Curling of the sintered specimens became severe at high energy density, and cracking was observed on the bases of multilayered specimens as a result of the excessive accumulation of residual tensile stresses. this work forms a basis for the production of selective laser sintered PC functional parts.
UR - http://www.scopus.com/inward/record.url?scp=0037473537&partnerID=8YFLogxK
U2 - 10.1021/ie0206352
DO - 10.1021/ie0206352
M3 - Article
AN - SCOPUS:0037473537
SN - 0888-5885
VL - 42
SP - 1850
EP - 1862
JO - Industrial & engineering chemistry research
JF - Industrial & engineering chemistry research
IS - 9
ER -