Characteristics of hardness at local propellers with variations of timing by using sandblasting method

Abstract

Sandblasting is one method of surface treatment that aims to improve the characteristics of material properties, such the hardness materials. This process was done by spraying abrasive material onto the surface of the object with the pressure. The purpose of this study was to increase the hardness of local propellers as a result of the sandblasting process. In this study, the material used aluminum alloys in the form of propellers of local fishing boats. While abrasive material used aluminum oxide with size 100 mesh. Then the pressure used 3, 4, and 5 bars with 25, 50, and 75 seconds in shooting times by angle 90. Measurement of hardness value used Universal Hardness Tester by macro-Vickers with load parameters 5 Kgf and indentation time of 10 seconds. The results showed that the longer the shooting time, the hardness of the propeller be increased 32.4% from the material that has not been carried out by the sandblasting process. The factor of time variation and shooting pressure has a significant effect on the results of the hardness in the specimen.