Sintering of tungsten carbide cermets with an iron-based ternary alloy binder: Processing and thermodynamic considerations

Pittari, John J.; Murdoch, Heather A.; Kilczewski, Steven; Hornbuckle, B.C.; Swab, Jeffrey J.; Darling, Kristopher A.; Wright, Jared

doi:10.1016/j.ijrmhm.2018.05.008

Cited by 34 publications

(23 citation statements)

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“…The resultant powder is on average 10 lm in diameter with a nanoscalegrain substructure. 18 The Fe-Ni-Zr binder powder was distributed throughout the WC powder using a ball-milling technique. The milling parameters were such that the process was designed to be more of a mechanical mixing/distribution method rather than a grainrefinement exercise.…”

Section: Experimental Procedures Materialsmentioning

confidence: 99%

“…The relatively low intensity mixing process is anticipated to ''smear'' the softer binder grains onto the harder WC grains in an effort to create a coated ceramic particle. 18 A scanning electron microscope (SEM) image of the milled WC-FeNiZr powder is shown in Fig. 1, which highlights the fine particle size and prismatic particle shape.…”

Section: Experimental Procedures Materialsmentioning

confidence: 99%

“…An iron-nickel-zirconium (Fe-Ni-Zr) alloy is a superior binder material to Co, providing high density and mechanical performance, while being environmentally friendly. 17,18 The effectiveness of the binder is illustrated by a comparison of the Knoop hardness values for the traditionally processed, dense samples, with WC-FeNiZr and WC-Co samples having values of 15.9 GPa and 12.9 GPa, respectively. 17 In practical applications of SLM of these materials, the Fe-Ni-Zr metal alloy binder has several processing advantages over Co.…”

Section: Introductionmentioning

confidence: 99%

“…17,18 The effectiveness of the binder is illustrated by a comparison of the Knoop hardness values for the traditionally processed, dense samples, with WC-FeNiZr and WC-Co samples having values of 15.9 GPa and 12.9 GPa, respectively. 17 In practical applications of SLM of these materials, the Fe-Ni-Zr metal alloy binder has several processing advantages over Co. The alloy melts at 1435°C, 17 which is a lower temperature than pure Co and therefore more amenable to a process that is dependent on binder melting for powder bed fusion .…”

Section: Introductionmentioning

confidence: 99%

“…17 In practical applications of SLM of these materials, the Fe-Ni-Zr metal alloy binder has several processing advantages over Co. The alloy melts at 1435°C, 17 which is a lower temperature than pure Co and therefore more amenable to a process that is dependent on binder melting for powder bed fusion . Ni and Zr also have higher boiling temperatures than Co, 5 which increases the temperature to which the powder bed can be heated before potentially vaporizing the binder from the cemented carbide system.…”

Section: Introductionmentioning

confidence: 99%

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Additive Manufacturing of Cemented Tungsten Carbide with a Cobalt-Free Alloy Binder by Selective Laser Melting for High-Hardness Applications

Pittari

Kilczewski

et al. 2019

JOM

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Cemented tungsten carbide (WC) is commonly used for wear-resistant applications, such as cutting tools and abrasives due to its extremely high hardness. This hardness leads to post-process machining of WC to be time-and cost-intensive. This study examined the feasibility of additive manufacturing of cemented WC to near-net-shape in an effort to reduce post-process machining. The binder phase in the manufactured samples is an iron-based alloy, which has a lower melting temperature than cobalt, the conventional binder in cemented WC. In this proof-of-concept study, cuboid specimens of WC with a low content of the iron-based alloy binder were printed; the effect of different processing conditions on the resultant density and microstructure of the material were investigated. Theoretical densities as high as 95% were achieved using this method. Artifacts indicative of the manufacturing process are present in the samples, and the challenges in removing the processing history from the final microstructure are discussed.

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Section: Experimental Procedures Materialsmentioning

confidence: 99%

Section: Experimental Procedures Materialsmentioning

confidence: 99%