Planar nanogrinding of a fine grained WC-Co composite for an optical surface finish

Yin, Ling; Pickering, J.P.; Ramesh, K.; Huang, Han; Spowage, A.C.; Vancoille, E.

doi:10.1007/s00170-004-2056-0

Cited by 18 publications

(7 citation statements)

References 40 publications

(49 reference statements)

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“…Room-temperature plasticity, although not common, has been observed in crystalline b-SiC nanowires under tension and is attributed to the formation and motion of dislocations followed by transition to an amorphous state [15,16]. Here, we focus on understanding the room-temperature mechanical behavior of single-crystalline 6H-SiC (a polytype of aSiC), a hard (>25 GPa), stiff (elastic modulus >415 GPa), and high melting point (T m % 3000 K) solid subjected to uniaxial compression [17][18][19]. We show that small (<300 nm in diameter) 6H-SiC single crystals deform plastically at room-temperature under a compressive load, exhibiting a long-sought combination of mechanical properties, high yield strength (>7.8 GPa), and considerable ($10% strain) plastic flow before failure, indicative of ductility.…”

Section: Introductionmentioning

confidence: 98%

Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals

et al. 2014

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In situ transmission electron microscopy observations of uniaxial compression of sub-300 nm diameter, cylindrical, single-crystalline 6H-SiC pillars oriented along h0 0 0 1i and at 45°with respect to h0 0 0 1i reveal that plastic slip occurs at room-temperature on the basal {0 0 0 1} planes at stresses above 7.8 GPa. Using a combination of aberration-corrected electron microscopy, molecular dynamics simulations and density functional theory calculations, we attribute the observed phenomenon to basal slip on the shuffle set along h1 1 0 0i. By comparing the experimentally measured yield stresses with the calculated values required for dislocation nucleation, we suggest that room-temperature plastic deformation in 6H-SiC crystals is controlled by glide rather than nucleation of dislocations.

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Section: Introductionmentioning

confidence: 98%

Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals

et al. 2014

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“…Although a nanometrically level surface was attained in this process, the system was complex and heavily relied on the operator’s expertise. 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.…”

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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“…Although many advanced cutting tools and methods have been developed, much work remains before all the factors contributing to surface finish can be controlled, especially in view of the complex interactions of the various process factors [1,2]. Therefore, researchers are making efforts to understand the impacts of the process factors on the surface integrity and surface finish of various workpiece materials machined by various processes [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Neural-Network Predicting of Surface Finish or Cutting Parameters for Carbide and Diamond Turning Processes

Zhong

Khoo

Han

2007

Materials and Manufacturing Processes

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Turning experiments, measurements of surface roughness of the turned surfaces, and neural network computing were conducted to predict surface finish or cutting parameters for carbide and diamond turning processes. A systematic approach to obtain an optimal network was adopted with the consideration of the effects of the network architecture and activation functions on the prediction accuracy of neural networks. Analysis of variance was conducted to evaluate the significance of the effects of 3-and 4-layer networks with sigmoid and hyperbolic tangent activation functions. Trial networks were further generated for searching the optimal number of neurons in the hidden layers. The versatility of neural networks was further explored by retraining the networks by including a surface roughness parameter as one of the inputs and placing depth of cut and feed rate as the outputs, and the results were promising.

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Planar nanogrinding of a fine grained WC-Co composite for an optical surface finish

Cited by 18 publications

References 40 publications

Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals

Dislocation glide-controlled room-temperature plasticity in 6H-SiC single crystals

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

Neural-Network Predicting of Surface Finish or Cutting Parameters for Carbide and Diamond Turning Processes

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