Chemical mechanism of chemical mechanical polishing of tungsten cobalt cemented carbide inserts

Mao, Meijiao; Wen-tao, Chen; Liu, Jingli; Hu, Zihua; Qin, Changjiang

doi:10.1016/j.ijrmhm.2020.105179

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…Due to this chemical etching process, a kind of polished surface gets generated with a low level of surface roughness, and a high accuracy in shape associated with marginal amount of subsurface damages can be produced. The disadvantage of this technique is that the chemicals stick onto the surface and were removed later [14]. Hence, this reaction is highly sensitive to inhomogeneous material, and the surface roughness obtained by chemical bowl-feed polishing technique is 0.5 nm rms for silicon samples.…”

Section: Chemical Polishingmentioning

confidence: 99%

Advances in Nano-finishing of Optical Glasses and Glass Ceramics

Suresh¹,

Rasheed²,

Gupta³

2020

Handbook of Advanced Ceramics and Composites

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Optical glass and glass ceramic components with angstrom-level surface roughness and nanometer-level dimensional accuracy are in potential demand for sophisticated optical fabrication. In recent years, aspherical and free-form surfaces are gaining prominence for high-performance applications. Moreover, the new optical materials and fabrication process which exhibit superior mechanical properties are being developed to meet the stringent requirements and harsh environment. Fabrication of complex-shaped high optical finish components becomes a significant challenge as conventional finishing techniques are unable to machine aspherical or free-form surfaces precisely. This situation demands few highly advanced and precise finishing processes which ensure stress-free surfaces. Mostly, the optical components are fabricated by shaping or pre-finishing methods followed by final finishing processes. Final finishing processes include more deterministic and flexible polishing techniques that can achieve desired surface finish, figure accuracy and surface integrity to make it suitable for shorter wavelength applications. In this chapter, basic principle, mechanism of various material removal processes, and precision polishing techniques such as magnetorheological fluid-based finishing were discussed and are compared with the convention polishing techniques.

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Section: Chemical Polishingmentioning

confidence: 99%

Advances in Nano-finishing of Optical Glasses and Glass Ceramics

Suresh¹,

Rasheed²,

Gupta³

2020

Handbook of Advanced Ceramics and Composites

View full text Add to dashboard Cite

show abstract

“…Yin et al [ 24 , 25 ] used ultraprecision grinding and nano-grinding techniques to fabricate WC-Co composites, and realized nanoscale surface finishes on WC-Co, but the grinding machine required a high stiffness and rigidity. Mao et al [ 26 ] carried out chemical mechanical polishing (CMP) on a WC-12Co alloy blade and revealed the mechanism of CMP of the WC-Co alloy. You et al [ 27 ] presented a comprehensive study of the surface-generation process of WC-0Co in laser-assisted polishing under various conditions and revealed the material-removal mechanism of the polycrystalline structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Binder during Ultra-Precision Polishing of Tungsten Carbide Using a Semirigid Bonnet Tool

et al. 2022

Materials

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Tungsten carbide (WC) has the characteristics of high hardness, high strength, corrosion resistance, wear resistance and excellent fracture toughness. Accordingly, it has been commonly used as the material for cutting tools and molds in glass-forming techniques. To obtain ultra-smooth surfaces, fine polishing of WC is indispensable. However, the efficiency of WC polishing is low using the existing polishing methods, and the mechanism behind the polishing process requires further investigation. Specifically, the effect of the binder in WC polishing is not clear since there are different kinds of WC with various weight percentages of the binder. In this paper, we present the findings of a study on the polishing performance of two kinds of WC material, with and without the binder, using a semi-rigid (SR) bonnet polishing tool. A series of experiments were performed on a 6-DOF robotic polishing instrument to investigate the material-removal characteristics, surface integrity and sub-surface damage after polishing. The results demonstrate that the SR bonnet polishing tool successfully reduced the surface roughness of WC with and without the binder to the nanometric level, though the lowest surface roughness was obtained on binder-less WC. No obvious sub-surface damage was observed under SEM inspection, while the processing efficiency was greatly improved owing to the high material removal rate of the tool. Based on our analysis of key polishing parameters and corresponding surface integrities, the effect of the binder on the polishing performance is explained, which offers excellent guidance for WC polishing.

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“…So, by varying the amount of cobalt, the required hardness and toughness characteristics can be obtained [ 3 ]. Tungsten cobalt cemented carbide inserts have a wide range of applications, mainly for cutting cast iron, non-ferrous metals, and their alloys [ 4 ]. However, the binder itself is much softer than the cemented carbides, so that increase of the cobalt binder content weakens the overall mechanical properties of the cutting tool, and does not improve its wear resistance [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Cobalt-Free Nanostructured WC Cutting Inserts for Machining of a TiC/Fe Composite

et al. 2021

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The paper presents results of investigations on the binderless nanostructured tungsten carbide (WC) cutting tools fabrication and performance. The scientific novelty includes the description of some regularities of the powder consolidation under electric current and the subsequent possibility to utilize them for practical use in the fabrication of cutting tools. The sintering process of WC nanopowder was performed with the electroconsolidation method, which is a modification of spark plasma sintering (SPS). Its advantages include low temperatures and short sintering time which allows retaining nanosize grains of ca. 70 nm, close to the original particle size of the starting powder. In respect to the application of the cutting tools, pure WC nanostructure resulted in a smaller cutting edge radius providing a higher quality of TiC/Fe machined surface. In the range of cutting speeds, vc = 15–40 m/min the durability of the inserts was 75% of that achieved by cubic boron nitride ones, and more than two times better than that of WC-Co cutting tools. In additional tests of machining 13CrMo4 material at an elevated cutting speed of vc = 100 m/min, binderless nWC inserts worked almost three times longer than WC-Co composites.

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Chemical mechanism of chemical mechanical polishing of tungsten cobalt cemented carbide inserts

Cited by 9 publications

References 14 publications

Advances in Nano-finishing of Optical Glasses and Glass Ceramics

Advances in Nano-finishing of Optical Glasses and Glass Ceramics

Effect of the Binder during Ultra-Precision Polishing of Tungsten Carbide Using a Semirigid Bonnet Tool

Feasibility of Cobalt-Free Nanostructured WC Cutting Inserts for Machining of a TiC/Fe Composite

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