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BACKGROUND:

Silver-matrix composite is usually used as a kind of electrical conductive matedal, which has excellent properties in electrical and heat conducting. MoS2, which used as a common solid lubricating material, has unique anti-frictional and lubricating properties in the process of wearing. Ag-MoS2 composites using in the area of electrical sliding wear were fabricated by adding MoS2 to the silver-matrix.

OBJECTIVE:

Ag-MoS2 composites with different content of MoS2 were produced to gain the mixture ratio for best properties by the experiments of mechanical and wear test. DESIGN, TIME AND

SETTING:

The controlled experiment was performed at the Department of Matedal Science and Engineering, Hefei University of Technology from April to May 2008. MATERIALS Silver powder (Bengbu Gold and Silver Article Factory, China) and MoS2 powder (Sinopharm Chemical Reagent Co., Ltd., China) were used in this study.

METHODS:

Ag-MoS2 composites for five different contents were fabricated by powder metallurgy method, which included the processes of powder mixture, drying, initial pressure, sintering, and second pressure. MoS2 contents were the MoS2 composite of 12.0%, 13.5%, 15.0%, 16.5%, 18.0% silver- MoS2. MAIN OUTCOME

MEASURES:

Flexural strength was measured by versatility mechanical testing machine. The microstructures of the composites after sintering were observed by an optical microscope. The electrical sliding friction and wear properties were tested by the electrical wear test machine. The worn surfaces of the samples were observed by a scanning electron microscope.

RESULTS:

With the increase in MoS2, the flexural strength decreased, the resistivity increased, and the wear loss decreased first, and then increased, which comes the lowest point when the MoS2 content was 15%.

CONCLUSION:

When the content of MoS2 is 15%, the average properties was the best.