Processing and characterization of a cobalt based alloy for use in diamond cutting tools

Oliveira, Hellen Cristine Prata de; Cabral, Stênio Cavalier; Guimarães, R.S.; Bobrovnitchii, G.S.; Filgueira, Marcello

doi:10.1002/mawe.200900531

Cited by 13 publications

(7 citation statements)

References 8 publications

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“…Prediction error was 11.7％, so the prediction results were good (Jang et al, 2014). The predication results show that the model has good precision (Oliveira et al, 2009). The predicted value of surface roughness under processing technology parameters (diamond abrasive grain, lateral pressure and reciprocating frequency of wire saw) can be obtained by using the limited test data through the model.…”

Section: Establishment and Prediction Of Surface Roughness Bp Modelmentioning

confidence: 88%

Research on Key Technologies of Diamond Wire Saw Machining in Hard-brittle Material with Ultrasonic Vibration

2016

Revista de la Facultad de Ingeniería

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In the paper, the new process of rotating electroplated diamond wire saw with ultrasonic vibration is used for cutting and machining the typical hard-brittle materials like glass and zirconia ceramics to analyze its kinematics, dynamics and other basic theories, moreover, the impact rules of wire saw rotating frequency, lateral pressure, abrasive grain and other process parameters on the machining sawing power and surface roughness are researched based on the experiment. The comparison between normal sawing and ultrasonic sawing in glass indicates that: under the same condition, the tangent-saw force of ultrasonic saving is lower than that of normal sawing by 20%~30%, and the normal sawing force is decreased when the lateral pressure of workpiece is small (less than 5N) and increased when the lateral pressure is large (5N or above); when the wire saw rotating frequency is 150rpm, the lateral pressure is 2N and the abrasive grain is 280#, the machining surface will be given with the best quality with surface roughness of Ra=0.3-0.4μm. Therefore, compared to the surface roughness of Ra=0.8-1.0μm of normal sawing under the same condition, the ultrasonic sawing is superior to the normal sawing by 1-2 levels.

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Section: Establishment and Prediction Of Surface Roughness Bp Modelmentioning

confidence: 88%

Research on Key Technologies of Diamond Wire Saw Machining in Hard-brittle Material with Ultrasonic Vibration

2016

Revista de la Facultad de Ingeniería

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“…Microstructural studies confirmed that for this sintered alloy, a FeCo solid solution is embedded into a Cu matrix. The Cu solubility is limited to about 2% at 800 °C [ 132 , 133 ]. A fairly good agreement has been achieved between the developed thermodynamic description and experimental data from XRD measurements and microstructure analysis found in the literature.…”

Section: Iron-based Materials As Solutions For Crm Substitution Inmentioning

confidence: 99%

“…The Fe–Co solid solution is essential for commercial matrices, which is responsible for good tool properties because it strengthens the alloy [ 133 ]. These matrices contain most commonly about 20% cobalt, which is still a high content, and therefore the research on total cobalt substitution continues.…”

Section: Iron-based Materials As Solutions For Crm Substitution Inmentioning

confidence: 99%

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

et al. 2021

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The Critical Raw Materials (CRMs) list has been defined based on economic importance and supply risk by the European Commission. This review paper describes two issues regarding critical raw materials: the possibilities of their substitution in iron-based alloys and the use of iron-based alloys instead of other materials in order to save CRMs. This review covers strategies for saving chromium in stainless steel, substitution or lowering the amounts of carbide-forming elements (especially tungsten and vanadium) in tool steel and alternative iron-based CRM-free and low-CRM materials: austempered ductile cast iron, high-temperature alloys based on intermetallics of iron and sintered diamond tools with an iron-containing low-cobalt binder.

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“…Therefore, it is difficult to obtain higher density and substrate strength when using commonly used cobalt-based hot pressed sintered metal adhesives in pressureless sintering [ 9 ]. In order to improve the strength and diamond-holding force of pressureless sintering diamond tools, the composition of a diamond substrate needs to be designed, such as Fe-Cu-Co [ 18 , 19 ]. Additionally, some sintering aids need to be added [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu-Sn Addition on Corrosion Property of Pressureless Sintered Fe-Cu-Co Substrate Alloys

Tao

Chen

et al. 2023

Materials

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Fe-Cu-Co prealloyed powder is used for bonding metal of diamond tools. In order to obtain diamond tools with good mechanical properties by pressureless sintering, it is necessary to add Cu-Sn sintering aids. The substrate also has high corrosion resistance requirements, which is conducive to the chemical erosion of diamond tools. This paper mainly studies the effects of Cu-Sn on the corrosion behavior of pressureless sintered Fe-Cu-Co substrate. The results show that the linear contraction rate and relative density of pressureless sintered Fe-Cu-Co alloy at 875 °C reach their peak when the Cu-Sn content is 8 wt.%, 15.13% and 97.5%, respectively. The substrate is mainly composed of α-Fe and Cu-rich phases, and selective corrosion occurs during electrochemical corrosion; namely, α-Fe grains are more prone to corrosion than Cu-rich grains to form porous corrosion surfaces. With the increase in Cu-Sn addition, the volume fraction of the Cu-rich phase increases, the corrosion current density and the passive current density gradually decrease, and the corrosion resistance of the alloy is improved. The amount and integrity of anodic passive film on the Fe-Cu-Co surface increases with the increase in Cu-Sn addition. The oxygen content of the anodic passivation film is lower than that of the active corrosion products of the α-Fe phase, thus reducing the oxygen concentration gradient and slowing down the corrosion. The addition of Cu-Sn is conducive to improving the corrosion resistance of Fe-Cu-Co alloy as the substrate of diamond tools.

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Processing and characterization of a cobalt based alloy for use in diamond cutting tools

Cited by 13 publications

References 8 publications

Research on Key Technologies of Diamond Wire Saw Machining in Hard-brittle Material with Ultrasonic Vibration

Research on Key Technologies of Diamond Wire Saw Machining in Hard-brittle Material with Ultrasonic Vibration

Solutions of Critical Raw Materials Issues Regarding Iron-Based Alloys

Effect of Cu-Sn Addition on Corrosion Property of Pressureless Sintered Fe-Cu-Co Substrate Alloys

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