THE EFFECT OF NIAL PARTICLE SIZE TO THERMAL SHOCK BEHAVIOUR IN FEEDSTOCK CR3C2 – NIAL – AL2O3 AT HVOF THERMALSPRAY COATING

• Main Author: RIKARDO (NIM : 13706005); Pembimbing 1 : Dr. Ir. Husaini Ardy; Pembimbing 2 : Dr. Eng. Budi Pr, NIKO
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/16706
• Institution: Institut Teknologi Bandung

Ceramic metal composites (cermets) have attracted considerable attention for aplication in industry where high wear and corrosions resistance are required. Cr3C2 <br /> <br /> <br /> <br /> <br /> based cermet high has hardness, medium fracture toughness, and good oxidation resistance. This research utilize cermet as feedstock in HVOF thermal spray coating for low carbon steel. The cermet for the feedstock is a mixture of Cr3C2-NiAl-Al2O3 with weight ratio of 60:30:10. <br /> <br /> <br /> <br /> <br /> The goal of this research is to study the knowledge of the effect of NiAl particle size to thermal shock behaviour at coating. The size of NiAl particles are -125 &#956;m, -75&#956;m, -53 &#956;m and -38 &#956;m. The importance of this research lies in high temperature usage of this coating. Thermal shock resistance can be observed by the number of cycle before failure in simulated conditions. Microstructures is analyzed throughout the process to observed effect of thermal shock. <br /> <br /> <br /> <br /> <br /> The result shows that the hardness of the coatings and porosity increase while unmelted particle size decrease as the particle size decrease. Particle size of NiAl -38 <br /> <br /> <br /> <br /> <br /> shows the best thermal shock resistance. Microstructure analysis is used to determine the mod of failure.