Properties of sintered bronze-graphite containing calcium sulfate derived from waste plaster molds
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Publication Details
Author list: Auechalitanukul C., McCuiston R., Bunlangsup B., Naikorn C., Tapanaun S.
Publisher: Trans Tech Publications
Publication year: 2017
Volume number: 751 KEM
Start page: 25
End page: 30
Number of pages: 6
ISBN: 9783035710823
ISSN: 1013-9826
eISSN: 1662-9795
Languages: English-Great Britain (EN-GB)
Abstract
This study examined the effect of calcium sulfate additions on the microstructure and frictional properties of a 95bronze-5graphite material, commonly used for frictional applications. The samples were prepared using a powder metallurgy process. The calcium sulfate powder was obtained from recycled plaster molds previously used for ceramic slip casting. The plaster molds were cleaned, crushed and ball milled to obtain powder, which was calcined at 400 ฐC for 4 hours and screened. 2 to 8 weight percent calcium sulfate powder was added to a premixed powder composed of copper and tin and mixed before the graphite was added. The powder mixture was compacted into a disc shape under a pressure of 500 MPa. The compacted samples were sintered at 750 ฐC for 30 minutes in a reducing atmosphere. It was found that the green density of the samples decreased with increased amounts of calcium sulfate. After sintering, the densities were found to have decreased due to sample expansion. A finer microstructure was observed in the samples containing calcium sulfate powder, possibly due to a grain boundary pinning effect. The addition of calcium sulfate resulted in the reduction of both the measured friction coefficient and wear of the bronze-graphite samples. However, the addition of calcium sulfate powder above 6 weight percent appeared to show decreasing effects. ฉ 2017 Trans Tech Publications, Switzerland.
Keywords
Calcium Sulfate, Waste Plaster
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