COMPOSITE MATERIAL HAVING METALLIC GLASS SPRAY-COATING LAYER FORMED ON SHEET METAL SUBSTRATE AND METHOD FOR MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a composite material in which a compact metallic spray-coating layer is firmly deposited on a surface of an extremely thin metal substrate without breaking the metal substrate.SOLUTION: In the metallic glass composite material, the metallic glass spray-coating layer with no throughhole (pinhole) is formed on the surface of the metal substrate with a thickness of 5-300 μm without breaking the metal substrate. The metallic glass spray-coating layer is formed by heating at least a portion of a metal glass powder until it reaches a supercooled liquid state and solidifying and laminating the same on the surface of the metal substrate at a particle velocity of ≥300 m/s by thermal spraying. The supercooled liquid temperature range ΔTx of the metallic glass is ≥30°C, and the glass transition temperature Tg is ≤500°C. A pressurizing treatment of the metallic glass spray-coating layer at a supercooled liquid state can improve adhesion, denseness and homogeneity of the layer.