A novel approach to reduce in-service temperature in WC-Co cutting tools

Guimarães, Bruno; Fernandes, C.M.; Figueiredo, Daniel; Cerqueira, M. F.; Carvalho, Ó.; Silva, Filipe; Miranda, G.

doi:10.1016/j.ceramint.2019.09.299

Cited by 38 publications

(9 citation statements)

References 33 publications

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“…It should be noted that the electrical conductivity of WB2.5 alloyed with Mo or Re (≈2.5 × 10 6 S/m) is greater than the electrical conductivity of 304 stainless steel (1.45 × 10 6 S/m) and in the case of 24 at. % zirconium is similar to the electrical conductivity of WC-Co cemented carbides (4.76 × 10 6 S/m) [31]. Furthermore, the increased content of chromium decreased the electrical conductivity.…”

Section: Electrical Conductivitysupporting

confidence: 62%

“…For these materials, the addition of chromium reduces the electrical conductivity of the sintered compacts from 1.393 × 10 6 to 0.954 × 10 6 S/m. It should be noted that the electrical conductivity of WB 2.5 alloyed with Mo or Re (≈2.5 × 10 6 S/m) is greater than the electrical conductivity of 304 stainless steel (1.45 × 10 6 S/m) and in the case of 24 at.% zirconium is similar to the electrical conductivity of WC-Co cemented carbides (4.76 × 10 6 S/m) [31].…”

Section: Electrical Conductivitymentioning

confidence: 86%

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Properties of Spark Plasma Sintered Compacts and Magnetron Sputtered Coatings Made from Cr, Mo, Re and Zr Alloyed Tungsten Diboride

et al. 2021

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To enhance the properties of tungsten diboride, we have synthesized and characterized solid solutions of this material with chromium, molybdenum, rhenium and zirconium. The obtained materials were subsequently deposited as coatings. Various concentrations of these transition metal elements, ranging from 0.0 to 24.0 at.%, on a metals basis, were made. Spark plasma sintering was used to synthesize these refractory compounds from the pure elements. Elemental and phase purity of both samples (sintered compacts and coatings) were examined using energy dispersive X-ray spectroscopy and X-ray diffraction. Microindentation was utilized to measure the Vickers hardness. X-ray diffraction results indicate that the solubility limit is below 8 at.% for Mo, Re and Zr and below 16 at.% for Cr. Above this limit both diborides (W,TM)B2 are created. Addition of transition metals caused decrease of density and increase of hardness and electrical conductivity of sintered compacts. Deposited coatings W1−xTMxBy (TM = Cr, Mo, Re, Zr; x = 0.2; y = 1.7–2) are homogenous, smooth and hard. The maximal hardness was measured for W-Cr-B films and under the load of 10 g was 50.4 ± 4.7 GPa. Deposited films possess relatively high fracture toughness and for WB2 coatings alloyed with zirconium it is K1c = 2.11 MPa m1/2.

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Section: Electrical Conductivitysupporting

confidence: 62%

Section: Electrical Conductivitymentioning

confidence: 86%

Properties of Spark Plasma Sintered Compacts and Magnetron Sputtered Coatings Made from Cr, Mo, Re and Zr Alloyed Tungsten Diboride

et al. 2021

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“…Compared with materials that have properties such as high-speed steel, diamond, and ceramics, cemented carbide has not only good strength but also excellent toughness, good impact resistance, and thermal shock resistance, [1][2][3][4] which is one of the most widely used tool materials. WC-Cocemented carbide is widely used in the industrial field.…”

Section: Introductionmentioning

confidence: 99%

A New WC‐Based Tool Material with High Comprehensive Mechanical Properties

et al. 2022

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In this article, a new WC‐ Al2O3 composite tool material is successfully fabricated by vacuum hot‐pressed sintering process with high hardness and flexural strength as well as fracture toughness, which solved the problem of mutual restriction between hardness and toughness of existing WC‐Co composite tool materials. By adding Al2O3, the hardness of WC‐based cemented carbide tool is significantly improved, the flexural strength and fracture toughness are also improved. The fracture mode of WC‐Al2O3 composites is transgranular/intergranular mixed fracture mode due to the addition of Al2O3, and more fracture energy is consumed during crack propagation, thus improving the fracture toughness of WC‐ Al2O3 composites. When Al2O3 content is 5 wt%, the comprehensive mechanical properties of WC‐based cemented carbide is the best, with a fracture toughness of 12.3 ± 1.0 MPa· m1/2, a flexural strength of 1385 ± 65 MPa, and Vickers hardness of 22.8 ± 1.6 GPa. In this article, the sintering temperature and holding time are optimized. The WC‐ Al2O3 composite tool materials with excellent comprehensive mechanical properties are fabricated at low sintering temperature of 1450 °C by using appropriate original powder particle size. The hardness is improved while maintaining high flexural strength and high fracture toughness.

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“…The research of the cutting temperature in drilling thermo plastic polymers by Weinert [51] showed that low cutting speed and high feeds are helpful to realize favored tool temperature and to reduce heat impact zone. Guimaraes [52] improved the thermal conductivity of the tool by incorporating copper heat sinks in a designated position of the tool. Behera [53] found that coated tools reduce cutting force and cutting temperature to a large extent in dry machining of Inconel 825 compared to uncoated tools.…”

Section: Introductionmentioning

confidence: 99%

Machining temperature comparative analysis of end mill and novel tool in orbital drilling of CFRP composite

Kong

Gao

2021

Preprint

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Applying Carbon fiber-reinforced plastics (CFRPs) instead of traditional materials can improve the structural strength and reduce the weight of the spacecraft. However, the defects and the rejections still impede the wide application of CFRP for the contrasting thermo-mechanical properties of fibers and resin. A lower machining temperature can reduce burrs and delamination effectively. To study the cutting temperature of orbital drilling in CFRP, the processing temperature of the conventional orbital drilling (COD) was compared with the novel orbital drilling and reaming tool (ODR), and a heat transfer model considering the influence of convective heat transfer on cutting temperature was also proposed in this research, which can explain the reason of the novel tool with a lower cutting temperature. On the basis of the analysis of the kinematic mechanisms, a cutting force prediction model for the process of orbital drilling was presented. The three-dimensional, unsteady state, nonhomogeneous partial differential heat transfer equation in polar coordinates was established, and solved with the finite difference approach. The results show that the predictions of models are coincided to the experimental data, and ODR tool can reduce the processing temperature of orbital drilling effectively.

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A novel approach to reduce in-service temperature in WC-Co cutting tools

Cited by 38 publications

References 33 publications

Properties of Spark Plasma Sintered Compacts and Magnetron Sputtered Coatings Made from Cr, Mo, Re and Zr Alloyed Tungsten Diboride

Properties of Spark Plasma Sintered Compacts and Magnetron Sputtered Coatings Made from Cr, Mo, Re and Zr Alloyed Tungsten Diboride

A New WC‐Based Tool Material with High Comprehensive Mechanical Properties

Machining temperature comparative analysis of end mill and novel tool in orbital drilling of CFRP composite

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