Composition of BÃHLER metal powders - Tenica

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Flame sprayingPowder flame spraying is a coating process, during which thespraying powder is melted by means of an oxy-fuel gas flameand sprayed onto the surface of the workpiece. This processis based upon a flame temperature of about 3,100 °C. Thepowder particles reach a speed up to 250 m/s, depending onparticle size, spraying distance and operational data of thespray gun. Whilst passing through the flame, the powderparticles should be in a melted and/or plastic condition.Powder flame spraying can be divided into two processes:■ Powder flame spraying without secondary thermaltreatment (cold spraying process)■ Powder flame spraying with subsequent fusing-in(melt fusion)With flame spraying the surface of the workpiece has to becleaned thoroughly of rust, grease and oil before the realbase preparation. The roughening of the metallically cleanFlame spraying with theBÖHLER metal powder Niborit 6-P.12
surface should be made by blasting or rough grinding to facilitatea good bond with the sprayed layer. Spraying shouldimmediately be carried out after the surface preparation.With powder flame spraying without secondary thermaltreatment (called cold spraying process) a workpiece temperatureof up to 300 °C is not exceeded, so that no changesin the structure of the component occur. With cold sprayingprocess, the problem of distortion is eliminated allconventional powder alloys used in industry can be sprayed.With the powder flame spraying process with subsequentfusing-in (called melt fusion), the applied metallic sprayinglayers are subsequently sintered at temperatures of 1,000 to1,200 °C. The subsequent treatment can either be carriedout with the aid of torches, with furnaces or by induction.For these process variations only the so-called self-flowingalloys with a nickel base and cobalt base are used. Theirportions of boron and silicon aid the fusing process. Throughthis fusing process dense sprayed layers are produced andhave considerably improved properties in respect of homo-Flame spraying with BÖHLER metal powder Niborit 6-P.geneity, adhesion and surface roughness. Fields of applicationfor these powder flame spraying processes are to befound, in the chemical, glass, plastic and electrical industryas well as in machine, pump and compressor constructions.Powder flame spraying without secondary thermal treatment(cold spraying process)spraying powder onlySchematic representationof flame sprayingPowder flame spraying process with subsequent fusing-in(melt fusion)spraying powder afterwards fuse-in sprayed layer (sintering)13
Page 1: METAL POWDER AND CASTING RODS
Page 4 and 5: Everything under control:The know-h
Page 6 and 7: The powder is also precipitated und
Page 8 and 9: Hardfacing and thermal sprayingMeta
Page 10 and 11: Flame spray weldingFlame spray weld
Page 14 and 15: Plasma and high-velocity flame spra
Page 16 and 17: Hardfacing process with casting rod
Page 18 and 19: Typical properties of metal powder
Page 20 and 21: Use of BÖHLER metal powdersGrade A
Page 22 and 23: Composition of BÖHLER casting rods
Page 24 and 25: Deliverable dimensions of BÖHLER c
Page 26 and 27: Physical propertiesThermal expansio
Page 28 and 29: Corrosion behaviour of BÖHLER meta
Page 30 and 31: Practical tips regarding hardfacing
Page 32: Published by BÖHLER WELDINGBöhler

Composition of BÃHLER metal powders - Tenica

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Composition of BÃHLER metal powders - Tenica