Measuring of Young's modulus of coatings by high velocity arc spraying

An effective three-point bending test based on compound beam theory is introduced.The Young's moduli of FeCrAl coatings and NiCr coatings by high velocity arc spraying are measured through three-point bending test.The results show Young's modulus of coatings are much less than that of corresponding spraying wire.The analysis indicates that the lower Young's modulus is induced by inherent characters of coatings.The flaws,such as pores in the coatings,result in that the actual bulk of coating is less than macroscopical bulk of coating.The reason that Young's modulus of FeCrAl coatings is less than that of NiCr coatings is that the porosity and metal particle size of FeCrAl coatings are larger than those of NiCr coatings.