▎ 摘　　要

NOVELTY - A material surface crack detecting method involves utilizing an inorganic insulating coating to form an insulating layer on the surface of the non-metallic material to be inspected. The inorganic insulating coating is dried at 200 degrees C for 6-8 hours, subjected to use a coating containing metal particles to form a metal particle coating on the surface of the non-metallic material to be tested, followed by scanning the surface of the metal particle coating by an eddy current detecting probe after drying the metal particle coating, discontinuing the metal particle coating plated at the deformation or crack when the surface of the non-metallic material to be inspected is deformed or cracked, finding corresponding deformation eddy current defect signal or a crack eddy current defect signal which appears in the eddy current detection probe to indirectly detect the deformation or crack on the surface of the non-metallic material to be inspected. USE - Method for detecting material surface crack. DETAILED DESCRIPTION - A material surface crack detecting method involves utilizing an inorganic insulating coating to form an insulating layer on the surface of the non-metallic material to be inspected. The inorganic insulating coating is dried at 200 degrees C for 6-8 hours, subjected to use a coating containing metal particles to form a metal particle coating on the surface of the non-metallic material to be tested, followed by scanning the surface of the metal particle coating by an eddy current detecting probe after drying the metal particle coating, discontinuing the metal particle coating plated at the deformation or crack when the surface of the non-metallic material to be inspected is deformed or cracked, finding corresponding deformation eddy current defect signal or a crack eddy current defect signal which appears in the eddy current detection probe to indirectly detect the deformation or crack on the surface of the non-metallic material to be inspected, where the inorganic insulating coating is obtained by co-modifying the silica sol coating with 0.1-5 wt.% mica and 0.1-3 wt.% graphene.