Searched for: subject%3A%22Ceramic%255C%2Bmaterials%22
(1 - 20 of 21)

Pages

document
Simons, E.C. (author), Weerheijm, J. (author), Sluys, L.J. (author)
Alumina ceramic is often used in armour systems. This material is known to have a brittle response under tensile loading, while a ductile response is found when sufficiently high pressures are reached. During projectile impact a ceramic material experiences both tensile loading and high pressures, hence fails in both a brittle and ductile way....
article 2019
document
Carton, E.P. (author), Roebroeks, G.H.J.J. (author), Weerheijm, J. (author), Diederen, A.M. (author)
Research on armor ceramics created only limited success in its search for relations between mechanical properties and the ballistic efficiency of this class of materials. Also TNO performed research on this subject using a range of experimental test set-ups (mainly using small and mid-caliber rounds) and diagnostic tools on a range of ceramic...
conference paper 2018
document
Koivisto, A.J. (author), Kling, K.I. (author), Fonseca, A.S. (author), Brostrøm Bluhme, A. (author), Moreman, M. (author), Yu, M. (author), Costa, A.L. (author), Giovanni, B. (author), Ortelli, S. (author), Fransman, W. (author), Vogel, U. (author), Jensen, K.A. (author)
Nanoscale TiO2 (nTiO2) is manufactured in high volumes and is of potential concern in occupational health. Here, we measured workers exposure levels while ceramic honeycombs were dip coated with liquid photoactive nanoparticle suspension and dried with an air blade. The measured nTiO2 concentration levels were used to assess process specific...
article 2018
document
Khanbareh, H. (author), de Boom, K. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Tri-phase PZT-porous polyurethane (PU) composites are investigated with the aim of developing conformable, highly sensitive tactile sensors for application in Human-Machine Interactions. The main goal is to reduce the dielectric constant of the polymer matrix, and improve flexibility of traditional diphase piezo-composites, consisting of ceramic...
article 2017
document
Khanbareh, H. (author), de Boom, K. (author), Schelen, B. (author), Scharff, R.B.N. (author), Wang, C.C.L. (author), van der Zwaag, S. (author), Groen, P. (author)
The need for flexible, highly sensitive tactile sensors that can fit onto curved surfaces is driving the conformable sensor materials research in the field of human–machine interactions. Here we report a new type of compliant piezoelectric active composite, a micro-porous polyurethane-PZT material, capable of generating a voltage output upon...
article 2017
document
Khanbareh, H. (author), Hegde, M. (author), Bijleveld, J.C. (author), van der Zwaag, S. (author), Groen, P. (author)
High temperature ferroelectrics for thermally stable devices that can detect pressure and temperature are of great industrial interest. Here we describe composites of lead titanate (PT) particle-polyetherimide (PEI) polymers with stable dielectric and piezoelectric properties over a broad range of temperature and frequency. The reported...
article 2017
document
Shaji Karapuzha, A. (author), van der Zwaag, S. (author), Groen, W.A. (author)
Modern flexible and sensitive sensors based on polymer–ceramic composites employ lead zirconate titanate (PZT) granulates having the morphotropic phase boundary (MPB) composition as the piezo active ingredient, as this composition gives the best properties in fully ceramic piezoelectric sensors. In this study, the possibility of using PZT...
article 2016
document
Carton, E.P. (author), Roebroeks, G.H.J.J. (author), Weerheijm, J. (author), Diederen, A.M. (author), Kwint, M.E. (author)
Several specially designed experimental techniques including an alternative test method have been developed for the evaluation of ceramic based armor. Armor grade ceramics and a range of combined materials have been tested using 7.62 AP rounds. Using the energy method [12] the dwell-time and total energy absorbed from the AP core were determined...
conference paper 2016
document
Revel, G.M. (author), Martarelli, M. (author), Emiliani, M. (author), Gozalbo, A. (author), Orts, M.J. (author), Bengochea, M.T. (author), Guaita Delgado, L. (author), Gaki, A. (author), Katsiapi, A. (author), Taxiarchou, M. (author), Arabatzis, I. (author), Fasaki, I. (author), Hermanns, S. (author)
The paper describes the methodology followed for the development of new cool products in order to widen the range of existing solutions both including coloured (even dark) materials and extending the application also to building vertical components. Cool coloured ceramic tiles and acrylic paints for façades and roof membranes have been developed...
article 2014
document
Abadjieva, E. (author), Khoe, Y.S. (author)
The interaction of thin ceramic tiles with AP8 (WC core, 7,62 mm) at 1000 m/s velocity has been studied experimentally and numerically. “Thin” ceramic tiles refers here to ratio of the tile thickness (t) to the projectile diameter, (d), t/d@ 1, as they are both in the same order. The method applied to visualize the penetration dynamics has been...
conference paper 2013
document
Abadjieva, E. (author), Carton, E.P. (author)
The ballistic behavior of four different armor ceramic materials with thicknesses varying from 3 mm to 14 mm has been investigated. These are two types of alumina Al2O3 armor grades and two types of SiC armor grades produced by different armor ceramic producers. The ballistic study has been performed using the standard DoP technique with two...
conference paper 2013
document
van den Ende, D.A. (author), Maier, R.A. (author), van Neer, P.L.M.J. (author), van der Zwaag, S. (author), Randall, C.A. (author), Groen, W.A. (author)
In this work, the piezoelectric properties at high electric fields of dielectrophoretically aligned PZT - polymer composites containing high aspect ratio particles (such as short fibers) are presented. Polarization and strain as a function of electric field are evaluated. The properties of the composites are compared to those of PZT-polymer...
article 2013
document
Mikkenie, R. (author), Steigelmann, O. (author), Groen, W.A. (author), ten Elshof, J.E. (author)
The effect of Y2O3 concentration on the dielectric properties of ceramic disc capacitors and multilayer capacitors containing 50 dielectric layers with an approximate thickness of 3µm were investigated. The relative permittivity and temperature coefficient of capacity of multilayer capacitors at low and high applied field suggest that two types...
article 2012
document
Appleby-Thomas, G.J. (author), Hazell, P.J. (author), Stennett, C. (author), Cooper, G. (author), Herlaar, K. (author), Diederen, A.M. (author), TNO Defensie en Veiligheid (author)
WC-based ceramic metal composites (cermets) are of great importance in both armor and munition design due to the combination of properties imparted by the presence of two different phases. WC-Co cermets are of interest in this area due to the hardness and strength imparted by the WC phase while the cementing Co matrix acts to increase plasticity...
article 2009
document
TNO Industrie en Techniek (author), Peters, T.A. (author), Poeth, C.H.S. (author), Benes, N.E. (author), Buijs, H.C.W.M. (author), Vercauteren, F.F. (author), Keurentjes, J.T.F. (author)
Thin, high flux and highly selective cross-linked poly(vinyl)alcohol waterselective layers have been prepared on top of hollow fibre ceramic supports. The supports consist of an α-Al2O3 hollow fibre substrate and an intermediate γ-Al2O3 layer, which provides a sufficiently smooth surface for the deposition of ultra-thin PVA layers. Membranes...
article 2006
document
Meijerink, M.G.H. (author), Nieuwkoop, E. (author), Veninga, E.P. (author), Meuwissen, M.H.H. (author), Tijdink, M.W.W.J. (author), TNO Industrie en Techniek (author)
A capacitive pressure sensor was realized by means of a post-processing step on a low temperature co-fired ceramics (LTCC) substrate. The new sensor fabrication technology allows for integration of the sensor with interface circuitry and possibly also wireless transmission circuits on LTCC substrates to realize a truly autonomous sensor unit. A...
article 2005
document
van Elp, J. (author), Giesen, P.T.M. (author), van der Velde, J.J. (author), TNO Industrie en Techniek (author)
Using anodic bonding, a strong bond has been created between the ultralow expansion glass ceramic Zerodur® from Schott and an Al coated piece of ultralow expansion glass (ULE® from Corning). The bond strength has been tested using a tensile testing machine. The bond strength is comparable to the fracture strength of the ULE® material. Using...
article 2005
document
Bos, B. (author), Gorter, H. (author), Dortmans, L.J.M.G. (author), Technisch Physische Dienst TNO - TH (author)
In recent years, there has been much interest in the manufacturing of piezoceramic actuators by Solid Freeform Fabrication (SFF) methods, following developments in polymer and metal shaping. With these methods, actuator shapes can be realized that are impossible or very difficult to obtain by traditional ceramic shaping techniques. At TNO,...
article 2004
document
Kuchta, F.D. (author), Lemstra, P.J. (author), Keller, A. (author), Batenburg, L.F. (author), Fischer, H.R. (author), Technisch Physische Dienst TNO - TH (author)
In order to link the fundamental research field of polymer crystallization with the technical important field of composite materials polymer-layered silicate nanocomposites from polyethylene (PE) are prepared and their morphology and properties are investigated. The effect of an external confinement introduced by highly anisotropic silicate...
conference paper 1999
document
Kudyba-Jansen, A. (author), Almeida, M. (author), Laven, J. (author), van der Heijde, J.C.T. (author), Hintzen, H.T. (author), Metselaar, R. (author), TNO Industrie (author)
Properties of carbothermally prepared Ca-α-SiAlON and β-SiAlON powders and aqueous suspensions thereof were determined. The isoelectric points of Ca-α-SiAlON and β-SiAlON were 3·4 and 4·6. After addition of deflocculant, Dolapix CE64, the behaviour of both suspensions is nearly identical. The isoelectric points become 5·5 and 5·3, respectively....
article 1999
Searched for: subject%3A%22Ceramic%255C%2Bmaterials%22
(1 - 20 of 21)

Pages