Ceramic Cutting Tools

Whitney, Dow

doi:10.1016/b978-0-08-096527-7.00037-4

Cited by 24 publications

(31 citation statements)

References 77 publications

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“…The specific surface area (SSA) of product zirconia nanoparticles was determined by nitrogen adsorption at 77 K (Micromeritics Tristar 3000) after degassing in nitrogen at 200 °C for at least 1 h. The primary particle diameter was calculated as d p = 6/(ρ p SSA) assuming monodisperse spheres (BET-equivalent diameter) and employing a density of ρ p = 5.72 × 10 3 kg/m 3 for tetragonal zirconia . The powder crystallinity was determined by X-ray diffraction (XRD; Bruker D8 Advance, 40 kV, 40 mA, Cu Kα radiation, Bragg–Brentano geometry) in the range of 2θ = 20–70°.…”

Section: Methodsmentioning

confidence: 99%

Scale-up of Nanoparticle Synthesis by Flame Spray Pyrolysis: The High-Temperature Particle Residence Time

Gröhn

Pratsinis

Sánchez‐Ferrer

et al. 2014

Ind. Eng. Chem. Res.

141

109

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The scale-up of nanoparticle synthesis by a versatile flame aerosol technology (flame spray pyrolysis) is investigated numerically and experimentally for production of ZrO 2 . A three-dimensional computational fluid dynamics model is developed accounting for combustion and particle dynamics by an Eulerian continuum approach coupled with Lagrangian description of multicomponent spray droplet atomization, transport, and evaporation. The model allows the extraction of the high-temperature particle residence time (HTPRT) that is governed by the dispersion gas to precursor liquid mass flow ratio as well as the flame enthalpy content. The HTPRT is shown to control the primary particle and agglomerate size, morphology, and even ZrO 2 crystallinity in agreement with experimental data. When the HTPRT is kept constant, the production rate for ZrO 2 nanoparticles could be scaled up from ∼100 to 500 g/h without significantly affecting product particle properties, revealing the HTPRT as a key design parameter for flame aerosol processes.

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Section: Methodsmentioning

confidence: 99%

Scale-up of Nanoparticle Synthesis by Flame Spray Pyrolysis: The High-Temperature Particle Residence Time

Gröhn

Pratsinis

Sánchez‐Ferrer

et al. 2014

Ind. Eng. Chem. Res.

141

109

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“…Here, multiple charge effects might not be relevant as only the average mass for a given mobility diameter, d m , is extracted (please see Appendix 6.1 for an example calculation). From the density of tetragonal zirconia ( ρ = 5.72·10 3 kg/m 3 ) [17], the solid agglomerate or aggregate volume v is estimated from its measured mass. The number concentration is measured after the APM analyzer with a condensation particle counter (CPC, Model 3775, TSI Inc.).…”

Section: Methodsmentioning

confidence: 99%

Mass-mobility characterization of flame-made ZrO2 aerosols: Primary particle diameter and extent of aggregation

Eggersdorfer

Gröhn

Sorensen

et al. 2012

Journal of Colloid and Interface Science

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Gas-borne nanoparticles undergoing coagulation and sintering form irregular or fractal-like structures affecting their transport, light scattering, effective surface area and density. Here, zirconia (ZrO 2 ) nanoparticles are generated by scalable spray combustion, and their mobility diameter and mass are obtained nearly in-situ by differential mobility analyzer (DMA) and aerosol particle mass (APM) measurements. Using these data, the density of ZrO 2 and a power law between mobility and primary particle diameters, the structure of fractal-like particles is determined (mass-mobility exponent, prefactor and average number and surface area mean diameter of primary particles, d va ). The d va determined by DMA-APM measurements and this power law is in good agreement with the d va obtained by ex-situ nitrogen adsorption and microscopic analysis. Using this combination of measurements and above power law, the effect of flame spray process parameters (e.g. precursor solution and oxygen flow rate as well as zirconium concentration) on fractal-like particle structure characteristics is investigated in detail. This reveals that predominantly agglomerates (physically-bonded particles) and aggregates (chemically-or sinter-bonded particles) of nanoparticles are formed at low and high particle concentrations, respectively.

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“…With highly attractive properties, such as extremely high hardness, high fracture toughness and high degree of chemical inertness, PCD has been widely used as a tool material for machining difficult-to-machine materials such as glasses and ceramics as well as for drill bits in oil and gas exploration. 1–3 For these applications, three-dimensional (3D) features on the PCD tools with good dimensional accuracy and surface quality are required. Thus, developing an appropriate micromachining process for PCD tool fabrication is imperative.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the machining performance and surface integrity in laser milling of polycrystalline diamonds

Wang

Huang

2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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The increasing use of diamond cutting tools necessitates the development of compatible fabrication technologies for the diamond tools, especially for three-dimensional surfaces with micron scale accuracy and good surface quality. In this article, the formation mechanism of surfaces milled using a nanosecond pulsed laser on polycrystalline diamond and the effect of process parameters on the milling performance such as material removal rate and surface integrity are investigated based on a statistically designed experiment. It is shown that laser milling is a viable technology for three-dimensional processing of polycrystalline diamonds with good machining rates and acceptable surface quality. A microscopy analysis indicates that diamond graphitization can occur on the milled surfaces, and laser pulse energy and pulse overlap have a significant effect on the milled surface morphology. Characterization of the machined surface/ subsurface is conducted using Raman spectroscopy, and the relationships between damaged surface layer thickness and process parameters are discussed. It is found that an optimum pulse overlap together with moderate pulse energy may be used, while the scan overlap should be selected in the vicinity of its optimum value at around 50% for a good surface quality while maintaining a high material removal rate.

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Ceramic Cutting Tools

Cited by 24 publications

References 77 publications

Scale-up of Nanoparticle Synthesis by Flame Spray Pyrolysis: The High-Temperature Particle Residence Time

Scale-up of Nanoparticle Synthesis by Flame Spray Pyrolysis: The High-Temperature Particle Residence Time

Mass-mobility characterization of flame-made ZrO2 aerosols: Primary particle diameter and extent of aggregation

Analysis of the machining performance and surface integrity in laser milling of polycrystalline diamonds

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