Measurement Methods of Mechanical Properties and Toughness for Self-Fluxing Alloy Coatings in High Temperature Environments

Abstract

Self fluxing alloys are useful for component materials as coatings in energy conservation systems and power plants due to high resistance of high temperature corrosion and erosion. However, the mechanical properties of the self fluxing alloy coatings at high temperatures have not been precisely investigated. In order to develop highly durable coatings and apply to practical services, we focused on measurements of hardness and fracture toughness for the self fluxing alloys at room and high temperatures. Spherical particle impact tests were conducted for three types of self fluxing alloys to obtain dynamic hardness and dynamic fracture toughness. Three point bending tests were additionally performed. As results, the hardness and fracture toughness of the three self fluxing alloys were found to be almost constant at room and high temperatures up to 873 K, although a little decrease in fracture toughness occurred at 1073 K. The fracture toughness related to elastic modulus and F/C 1.5 (F: load, C: crack length), and have a tendency of increasing with increase in Brinell hardness.