Method of coating a body, granules for the method and method of making granules

• Main Authors: Bernd Heinrich Ries, Daniel Hlawatschek, Igor Yurievich Konyashin
• Format: Patent
• Language: English
• Published: 27.04.2016
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; 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; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method of production of granules 60 for coating a body and the granules themselves are detailed. Each granule 60 comprises silicon (Si), carbon (C), chromium (Cr) and an iron group metal selected from iron (Fe), cobalt (Co) and nickel (Ni). The relative quantities of the Si, C and Cr are such that a molten phase comprising the Si, C, Cr and the iron group metal will form at a melting temperature of less than 1,300 degrees Celsius when at least a threshold quantity of the iron group metal is accessible to the Si, C and Cr. Each granule comprises substantially less than the threshold quantity of the iron group metal. A second source of the iron group metal is also provided. A combination of the granules and the second source is formed so that at least the threshold quantity of the iron group metal will be accessible to the Si, C and Cr. The granules and the second source are heated to at least the melting temperature to form the molten phase in contact with the body. The heat is then removed to allow the molten phase to solidify and to provide the coated body. The body that can be coated may be a pick tool or milling or mining. An additive manufacturing process may be used to coat the body said additive manufacturing process may includes direct metal laser sintering (DMLS), selective laser sintering (SLS) or electron beam melting (EBM). Arc plasma spray apparatus 10 can be used in the manufacture of the granules with a plasma torch for producing a plasma jet from a plasma nozzle 28.