THE EFFECT OF SURFACE TREATMENT AND DISTANCE OF SPRAYING USING ABRADABLE MATERIAL (WITH COPPER AS CONDUCTIVE MATERIAL) USING HIGH VELOCITY OXYFUEL (HVOF) METHOD ON MECHANICAL PROPERTIES AND WEAR CHARACTERISTICS

• Main Author: Martawirya, Suryandaru
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/41664
• Institution: Institut Teknologi Bandung

One phenomenon that is often arises on surfaces that rub against one another is wear. To solve this problem, it is necessary to modify the mechanical properties using abradable materials on the ST-37 low carbon steel substrate. Abradable material is one of the important materials in engine components, especially to protect the surface of objects that rub against each other, one example of abradable material that is easily obtained in the market and the price is relatively cheap is brake lining. This research is focused on coating ST-37 steel using abradable brake lining material by adding copper conductive material as heat conductor material using the HVOF coating method in order to increase wear resistance of ST-37 steel, implementing the coating process using abradable material with HVOF method it's still relatively new. This research was conducted by varying the shooting distance of 20, 30, and 40 cm and etching, blasting, and blasting etching on the ST-37 steel substrate using alumina blasting powder and ethanol mixture with orthopospate solution. Tests carried out include testing wear, thickness, hardness, and SEM EDS characterization to determine the performance of the resulting layer. Wear testing is carried out to analyze the level of wear resistance of the coating and the adhesive strength of the mechanical interlocking coating. Thickness measurements are calculated to find out the value of quantitative layer thickness. Hardness testing is carried out to analyze the quantitative value of the influence of mechanical property modification, while SEM-EDS testing is carried out to determine the wear characteristics of the coating. Based on the data obtained from the study, it was found that the abradable material layer resulting from the surface treatment of blasting etching with a spray distance of 20 cm has the most optimal value in terms of the least amount of porosity in coatings with ST-37 steel, the highest value of coating hardness of 468.2 HV0,5 kgf, the thickest average layer with an average value of 132.36 ?m, and the lowest mass reduction of 0.00148 mg. For wear characteristics it is found that all layers with surface treatment and spraying distance have abrasive wear characterized by plowing or fragmentation.