High-Speed Laser Melt Injection of Tungsten Carbide in Highly Conductive Copper Alloys

Warneke, Philipp; Seefeld, Thomas

doi:10.4028/www.scientific.net/kem.809.94

Cited by 2 publications

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References 4 publications

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“…As hard materials, tungsten carbide [9], silicon carbide [10] and various borides [11] were used. For coating aluminum bronze [12] and copper alloys [13], LMI of FTC was investigated. Usually, LMI works at process velocities below 1 m/min.…”

Section: Introductionmentioning

confidence: 99%

Wear Resistance of Hard Particle Reinforced Copper Alloys Generated by Laser Melt Injection

Warnecke

Seefeld

2020

DDF

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Highly conductive copper alloys are used for several tools in casting and welding technology. In order to improve the poor wear resistance of these alloys, metal matrix composite (MMC) layers were generated by laser melt injection (LMI). During LMI, a weld pool is induced on a substrate by a laser beam and a wear-resistant filler material is injected into this weld pool by a powder nozzle. In contrast to laser cladding, the filler material remains in the solid state and the substrate works as matrix material. Thereby, specific material properties of the substrate - e.g. a high thermal conductivity - can be provided not only in the core of the part but also within the coating. Fused tungsten carbide (FTC) was used as reinforcing material. It was shown that homogeneous MMC layers out of the copper alloy Hovadur® CNCS and FTC can be produced by laser melt injection. High process velocities of 8.75 m/min could be reached. For assessing the wear resistance, oscillating wear tests with counterparts made of steel were carried out and the wear height and the wear volume were determined. The particle reinforcement lead to a significant increase in wear resistance. Only one wear mechanism - abrasion - was identified.

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Section: Introductionmentioning

confidence: 99%

Wear Resistance of Hard Particle Reinforced Copper Alloys Generated by Laser Melt Injection

Warnecke

Seefeld

2020

DDF

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Improving the wear resistance of copper tools for pressure die casting by laser melt injection

Warneke

Bohlen

Seefeld

2022

Prod. Eng. Res. Devel.

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Highly conductive copper alloys are used for various tools in casting and welding technology. In pressure die casting, copper alloys are used for pistons pressing the metal melt into a die. The high thermal conductivity of these alloys allows short process times as a result of high cooling rates. Due to a poor wear resistance, wear occurs on the running surface of the pistons causing the metal melt to spurt out of the shot sleeve. In order to improve the service life of the pistons, a new approach was taken: a reinforcement of the copper alloys with fused tungsten carbide (FTC) particles by laser melt injection (LMI) at high process velocities. FTC provides a hardness between 2700 HV 0.1 and 3500 HV 0.1. During LMI, a melt pool is induced on the substrate by a laser beam and a filler material is injected into this melt pool by a powder nozzle. In contrast to laser cladding, the filler material remains in the solid state and the substrate works as matrix material. Thereby, specific material properties of the substrate—e.g. a high thermal conductivity—can be preserved within the surface layer. It was shown that the FTC particle reinforcement reduced the wear by 69–75%. Abrasion and adhesion were identified as the dominant wear mechanisms. The run-in behavior of FTC particle reinforced and non-reinforced parts was determined.

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High-Speed Laser Melt Injection of Tungsten Carbide in Highly Conductive Copper Alloys

Cited by 2 publications

References 4 publications

Wear Resistance of Hard Particle Reinforced Copper Alloys Generated by Laser Melt Injection

Wear Resistance of Hard Particle Reinforced Copper Alloys Generated by Laser Melt Injection

Improving the wear resistance of copper tools for pressure die casting by laser melt injection

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