The main objective of the present work is to determine effects laser processing on properties WC-Co electro-spark deposited (ESD) coatings steel substrates. Tungsten carbide have been applied substrates using a manual electrode feeder, model EIL-8A. beam (LBP) was performed an Nd:YAG fiber laser. microstructure and treated/melted were evaluated by means scanning electron microscopy (SEM), X-ray diffraction (XRD), surface geometric structure (SGS) roughness measurements adhesion,...

The aim of this work was to obtain a protective ZrO2 coating on diamond particles, which protect from oxidation and graphitization, enabling sintering at higher temperatures lower pressures than its thermodynamic stability in atmospheric conditions. coatings were obtained by mixing with zirconium oxidizing air or oxygen. Mixtures 80 wt% sintered SPS method 1250 °C 1450 °C. To stabilize the tetragonal structure ZrO2, 3 mol% Y2O3 added before milling process. composition powder phases,...

Six different commercial subsieve powders were used for examining the effects of particle characteristics on mean size and specific surface area. The measurements carried out using air permeability laser light diffraction techniques. experimental data indicate that both methods give similar results spherical powders. advantage systems over gas permeameters is ability to provide additional information distribution. Irregularly-shaped should be analysed by techniques relying permeametry area...

Recent trends in the technology, production and applications of diamond tooling are reviewed. The continuing fall price synthetic as volumes increase provides a strong incentive for companies to reduce cost matrix materials their manufacturing processes, with an accompanying need research these areas. Diamond wires cutting granite other rock continues grow application another focus technology advances.

Sintered diamond toolS -the PaSt, PreSent and FutureThe methods of making tools have undergone a remarkable development since the invention synthetic in mid-1950s.The current review summarises key historical, recent ongoing trends developments sintered tools.The report concentrates on used within stone construction industries which, being main consumers metal-bonded fabricated by powder metallurgy (P/M) technology, always fuelled advances tool design production technologies.

The objective of the present work was to determine suitability a new iron-based Mn–Cu–Sn matrix alloy for manufacture diamond-impregnated tool components. A number specimens were consolidated by hot press route from ball-milled powders. Density, microstructural features, phase composition, bending properties and hardness evaluated. results revealed excellent mechanical properties, including σ0.2 > 850 MPa in 3-point HK0.5 300. commercial Co-WC reference also produced comparison purposes....

Six different commercial powders, finer than 45 μm, were used for examining the effects of particle characteristics on mean size and specific surface area. The measurements carried out using most commonly air permeability- laser light diffraction (scattering) techniques. As permeability method has been as a benchmark decades in powder metallurgy (P/M) industry, physical phenomena that govern passage gas through bed under laminar flow conditions also presented. experimental data indicate both...

Abstract Today, wire sawing of natural stone is undergoing widespread commercialization. In addition to rock extraction and processing with single wires, composed a multitude diamond-impregnated beads mounted onto steel rope, this technology increasingly used for slabbing granite blocks on multi-wire machines. Evolving sophistication equipment dictates novel tool designs formulations. For technologists specifying bead compositions, it common habit instinctively follow the circular saw...

The main objective of the present work is to characterise microstructure and mechanical properties a new iron-base material which has been recently gaining ground in manufacture diamond impregnated tools as an economical substitute for cobalt alloys. Its density, hardness yield test have directly compared those hot pressed Cobalt Extra Fine (CoEF) powder. It shown that raw iron-663 bronze powder mix can be consolidated virtually pore-free condition by pressing at 880°C. Although...

The methods of making diamond impregnated cutting tools have undergone a fantastic development since the invention synthetic in 1950s. last five decades witnessed spectacular, >50fold, increase total consumption industrial diamond. Over this time, modern production techniques based on tooling been implemented into various areas activity enabling to do job faster, more accurately and at less cost. They revolutionised machinery processing stone construction industries, road repair, petroleum...

Abstract The work presents the possibility of substitution expensive, Co-WC powders, that have been traditionally used in production sintered diamond tools, with cheap iron-base counterparts manufactured by ball milling. It has shown ball-milled Fe-Ni and Fe-Mn powders can be consolidated to a virtually pore-free condition hot pressing at 900°C. as-consolidated materials are characterised high hardness, bending strength resistance 3-body abrasion.

The main objective of the present work was to determine influence laser treatment on microstructure, X-ray diffraction, microhardness, surface geometric structure and roughness, corrosion resistance tribological properties coatings deposited C45 carbon steel by electro-spark deposition (ESD) process. studies were conducted using WC-Cu electrodes produced powder metallurgy route. tests show that laser-treated are characterized higher resistance, roughness seizure which come at expense lower...

Abstract The possibility of the use inexpensive iron-base powders in production sintered diamond tools is again explored. Ball-milled Fe-Ni-Cu-Sn-C and Fe-Mn-Cu-Sn-C were consolidated to a virtually pore-free condition by hot pressing at 900°C. resultant materials are characterised combination high Knoop hardness, 260-440 yield strength, 780-1350 MPa, resistance abrasion. These properties can be significantly modified changing milling time.

Metal-bonded diamond impregnated tools are being increasingly used in the processing of natural stone, sawing and drilling concrete brickwork, road repair, petroleum exploration, production ceramics, cutting frozen foods, etc. Although main tool wear mechanisms seem to be well identified, scientific background is still inadequate extensive fundamental research has carried out better understand how performs actual applications. This work attempts address complex issues modelling abrasive...

The work presents the possibility of substitution expensive, wear resistant Co-WC powders, that have been traditionally used in production sintered diamond tools, with cheap iron-base counterparts manufactured by ball milling. It has shown ball-milled Fe-Ni-Cu-Sn-C powders can be consolidated to a virtually pore-free condition hot pressing at 900 ℃. as-consolidated material nanocrystalline structure and is characterised combination high hardness, mechanical strength excellent resistance...

In this work, Fe-Mn-Cu-Sn-C alloys were prepared by means of powder metallurgy (PM). Powder mixtures ball-milled for 8, 30 and 120 h densified to < 1% porosity using spark plasma sintering (SPS) at 900 °C 35 MPa. After consolidation, all samples the Fe characterized x-ray diffraction (XRD), scanning electron microscopy (SEM), hardness flexural strength tests. Resistance abrasive wear was evaluated in both three-body abrasion two-body The SEM observations revealed an evident dependence grain...

Abstract Why cobalt outperforms other matrix materials in its capacity for diamond retention cutting tools is considered. To this end loading conditions were modelled to establish the magnitude of stress and strain surrounding a working crystal. Only at 315 N did contact force Co result plastic 4-8%, which has destructive influence on retention. The field generated poorly performing Cu-40%Co-6%Sn under load 190 closely resembled that by Co. It postulated related yield strength work hardening...