Open AccessThe Effect of Sintering Holding Time on Aluminum–Marble Composite Hardness, Density and Porosity
Author(s) -
Faisal Habib,
Rudy Soenoko,
Sudjito Soeparman,
Yudy Surya Irawan
Publication year - 2020
Publication title -
xi'nan jiaotong daxue xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.308
H-Index - 21
ISSN - 0258-2724
DOI - 10.35741/issn.0258-2724.55.2.30
Subject(s) - materials science , porosity , sintering , compaction , composite number , indentation hardness , powder metallurgy , aluminium , metallurgy , composite material , scanning electron microscope , microstructure
Utilization of marble waste as a metal matrix composite reinforcement during the powder metallurgical process, with pure aluminum powder as the main ingredient, is intended to obtain a holding time for the sintering process at a temperature of 650oC in order to produce aluminum–marble composites with optimal hardness, density, and porosity. Marble powder was mashed and sieved to 200 mesh and then mixed with aluminum powder with a weight fraction of 20% marble powder and 80% aluminum powder. The mixed powder, after being fully stirred and then compacted with 300 MPa compaction pressure using a cold isostatic pressing method, was then sintered for 120, 180, or 240 minutes. Surface characteristics of each specimen were examined using Scanning Electron Microscopy followed by a hardness test. It was found that the specimen sintered for 240 minutes had the highest hardness. Then, using ASTM-C20 standard procedures, the porosity and density test results demonstrated that the specimen with 240 minutes sintering time also had the highest density and lowest porosity. The results of this study indicate that a longer heating time can increase the hardness and density of the specimen material.