Binding Mechanism and Shrinkage Prediction of Polypropylene, Polyethylene and Silica Particles in Isothermal Sintering Process

• Main Author: Perpustakaan UGM, i-lib
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2007
• Subjects: Jurnal i-lib UGM
• Online Access: https://repository.ugm.ac.id/25720/; http://i-lib.ugm.ac.id/jurnal/download.php?dataId=8720
• Institution: Universitas Gadjah Mada

Abstract Combination between sintering process and automation system has proven to be a manufacturing process that can produce mechanical parts with high geometric complexity. However on the development of various materials, varying material in one part has not been studied by many researchers. In addition the uniformity of strength and shrinkage aspects are problems that have not been perfectly solved. Based on these reasons, research of binding mechanism and the shrinkage prediction of particles on sintering process are importantly conducted. In this research, binding mechanisms were observed in isothermal sintering. Materials were used polypropylene, polyethylene and silica, while the occurring shrinkage prediction used polypropylene material. The images of in situ sintering process were observed by optical microscope camera with magnitude of 100x. Based on these images data, the equivalent diameter can be determined with projection area method and then, the shrinkage prediction can be calculated. The results show that the mechanism ofsintering of polypropylene and polyethylene is solid state sintering. During sintering, the expansion of dimension of polyethylene particle is greater than that of polypropylene. In sintering process between polyethylene and silica, the lower melting temperature particle (polyethylene) is as the driving binding among silica particles From shrinkage prediction, the final stage of polyethylene sintering at temperature of 11if C and holding time of 780 s yields shrinkage of20.47%. Keywords: binding mechanism, shrinkage, sintering, polyethylene, polypropylene