A sensor for measuring stresses including a layer of a magnetoelastic material and a method for producing the layer

• Main Authors: MINIOTAS ANDRIUS, LING HANS
• Format: Patent
• Language: Chinese; English
• Published: 24.08.2011
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; METALLURGY; PHYSICS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TESTING

The present invention relates to a sensor for measuring stresses induced by a force applied to a load-carrying member. The sensor includes a layer of a magnetoelastic material formed on the load-carrying member. The layer is inhomogeneous and comprises a first phase with an average grain size below 100 nm and a first chemical composition, and a second phase (17) of a distinctly different chemical composition, the first phase being divided by the second phase into regions (18) having an average size in the range of 100 - 10 000 nm, and a plurality of the regions have an oxygen level less than 1 wt%. The present invention also relates to a method for producing such a layer. The method comprises accelerating particles of a soft magnetic and magnetoelastic material having an average size in the range of 10-50 [mu]m towards the surface of the load-carrying member at a velocity of at least 300 m/s such that the average temperature of the accelerated particles is not higher than 500 DEG C above the melting temperatu