Relevant bibliographies by topics / Wollastonite composites

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Wollastonite composites'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Wollastonite composites"

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Cortés-Hernández, Dora A., Sergio Ortega, and Akemi A. Nogiwa-Valdez. "Apatite Formation on Zirconia Based Composites." Key Engineering Materials 309-311 (May 2006): 445–48. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.445.

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Bioactive Mg-PSZ composites were developed by using wollastonite ceramics either as a constituent of the composite formulation or as a bioactive bed during the biomimetic treatment in simulated body fluids. The zirconia composites were prepared by uniaxial pressing of powder mixtures and sintered at 1550oC in air. Wollastonite containing zirconia/alumina composites were also sintered at 1350oC. The composites were immersed in SBF for 7 days on a bed of wollastonite powder and then re-immersed in 1.5SBF for 7 days. Tests were also performed with no wollastonite bed. A highly bioactive surface was observed on the Mg-PSZ/CaSiO3 and Mg-PSZ/Al2O3 composites. A homogeneous apatite layer was detected on the Mg-PSZ/CaSiO3 composites immersed for only 7 days in SBF. No apatite was formed on the Mg-PSZ/Al2O3/CaSiO3 composite. During the sintering mechanism at either 1550 or 1350oC small amounts of aluminosilicate phases are formed. These phases inhibited the apatite formation.
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Yang, Ming Shan. "The Reinforcement of Acicular Wollastonite on Polypropylene." Advanced Materials Research 92 (January 2010): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amr.92.283.

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The wollastonite/PP composites were manufactured by twin-screw extruder and the effects of compatabilizer, feeding method and screw configuration on the properties of wollastonite/PP composites were investigated in this paper. The dispersion of fibrous wollastonite in PP matrix was determined by scanning electron microscope (SEM). The results showed that the strength, toughness and flowability of the composite were simultaneously guaranteed by using three different types of PP resins, and the interfacial adhesion was improved greatly by adding the compatabilizer of PP-g-MAH, which increases the comprehensive properties of wollastonite/PP composite. The fibrous dispersion of wollastonite in PP matrix was achieved by using of side feeding and the weak-shear screw configuration, which reaches the good reinforcing effect.
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Hemra, Khanthima, Takaomi Kobayashi, Pavadee Aungkavattana, and Sirithan Jiemsirilers. "Enhanced mechanical and thermal properties of fly ash-based geopolymer composites by wollastonite reinforcement." Journal of Metals, Materials and Minerals 31, no. 4 (December 16, 2021): 13–25. http://dx.doi.org/10.55713/jmmm.v31i4.1230.

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The present study investigated the mechanical and thermal properties of geopolymer composite. The geopolymer composite was prepared by mixing fly ash and wollastonite with the alkaline activator, which was 6 M KOH:K2SiO3 in a mass ratio of 1:1 and a solid:liquid mass ratio of 3:2. The compressive strength at 28 days of geopolymer was 33.3 MPa and possessed the highest strength of 38.3 MPa when 30 wt% wollastonite was added. The flexural strength presented differently whereby it increased from 2.1 MPa to 6.8 MPa. It increased remarkably up to 200% with the addition of 50 wt% wollastonite. The geopolymer composites were exposed to high temperatures at 800℃ to 1100°C for 2 h. Cracks were reduced since 20 wt% wollastonite was added. A high percentage of wollastonite presented excellent thermal stability. The total weight loss of the geopolymer composite at temperatures of 30℃ to 1400°C was minimized. It decreased from 25% to 12% when 50 wt% wollastonite was added, and the dilatometric data resulted in a dimensional change of almost zero. The phase development of the geopolymer composites at high temperatures showed the crystallization of leucite, kalsilite, calcium silicate, calcium aluminium silicate, and calcium aluminium oxide, which were the high temperature stable phases. The results indicated that wollastonite reinforced fly ash-based geopolymer composites are promising for use in high temperature applications.
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Wang, Cai Li, Shui Lin Zheng, and Huai Fa Wang. "Evaluation of Mechanical Properties of Polyamide 6(PA6) Filled with Wollastonite and Inorganic Modified Wollastonite." Applied Mechanics and Materials 217-219 (November 2012): 522–25. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.522.

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Some novel composites were prepared with polyamide 6(PA6) filled with wollastonite particles and wollastonite inorganic modified by aluminium silicate composite materials (WIMS) as fibrous fillers. Subsequently, these composites were investigated for tensile, charpy notched impact, bending strength, bending modulus and heat distortion temperature, and the mechanism of PA6 reinforced by WIMS was discussed through SEM photos of wollastonite and WIMS and the current two most popular equations: Pukanszky equation and Nielsen equation.The results show that the PA6 products filled with WIMS have superior mechanical properties(tensile strength 71.65Mpa, bending strength 106.61Mpa, bending modulus 3258.22Mpa) than that of uncoated wollastonite and pure PA6, and the heat distortion temperature increases by 88.6°C than pure PA6 and 17.2°C than wollastonite. Inorganic modification of wollastonite can improve the joint interface between wollastonite and PA6, thus improving their mechanical properties.
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Javed, Khalid, Farah Kanwal, Saadat Anwar Siddiqi, Shahid Atiq, Waheed Mushtaq, and Khalil Ahmed. "Facile Synthesis and Characterization of Wollastonite Polyindole Composites to Study their Electrical Conductivity Behaviour." Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences 62, no. 2 (August 9, 2019): 67–75. http://dx.doi.org/10.52763/pjsir.phys.sci.62.2.2019.67.75.

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In this work pure polyindole and its composites with wollastonite have been prepared by using anhydrous ferric chloride (FeCl3) as an oxidizing agent. Wollastonite (CaSiO3) was prepared by sol gel method using citric acid, calcium nitrate and tetraethylorthosilicate (TEOS) for the synthesis of composites. Particle size of the synthesized wollastonite was 58.8 nm. Effect of wollastonite weight percentages ranging from 1-25% of the polyindole in polyindole wollastonite (PIn/CaSiO3) composites was studied. Chemical structure was elucidated for polyindole/wollastonite (PIn/CaSiO3) composites and wollastonite (CaSiO3) was done through Fourier transform infra red spectroscopy (FTIR), which revealed successful fabrication of polyindole/wollastonite (PIn/CaSiO3) composites and wollastonite (CaSiO3) particles. Scanning electron microscopic technique was used for surface morphological studies. Thermal stability of the composites was examined through thermogravimetry. Four probe method was used to measure DC-conductivity of the samples. Composites showed DC conductivity in the range, 3.71´10-7 Siemens per centimeter.
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Amarababu, B., and V. Pandu Rangadu. "Synthesis and Characterization of Mineral Wollastonite Particulate Filled Vinyl-Ester Resin Composites." International Letters of Chemistry, Physics and Astronomy 37 (August 2014): 91–102. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.37.91.

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In the present research presents influence of coupling agent 1 % triethoxymethyl silane sprayed on to the wollastonite particulate powder before it dispersed into the vinylester/composites. Firstly two different composites were developed in which wollastonite is filled with vinylester resin and same wollastonite was sprayed with coupling agent 1 % triethoxymethyl silane then filled with vinylester resin. The particle functionalization with a bi-functional coupling agent 1 % triethoxymethyl silane was observed to have a significant effect on the curing process and subsequent physical properties of the composites. Wollastonite functionalization favors the composite fabrication with a lower curing temperature as compared to the as-received particle filled vinyl ester resin composites. Thermogravimetric analysis showed an increased thermo-stability in the particles functionalized filled vinyl ester resin composites as compared to the unmodified particle filled counterparts. The uniform particle dispersion and the chemical bonding between filler and vinyl ester resin matrix were found to contribute to the increased thermal stability and enhanced tensile strength and modulus.
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Amarababu, B., and V. Pandu Rangadu. "Synthesis and Characterization of Mineral Wollastonite Particulate Filled Vinyl-Ester Resin Composites." International Letters of Chemistry, Physics and Astronomy 37 (August 6, 2014): 91–102. http://dx.doi.org/10.56431/p-ycy6bl.

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In the present research presents influence of coupling agent 1 % triethoxymethyl silane sprayed on to the wollastonite particulate powder before it dispersed into the vinylester/composites. Firstly two different composites were developed in which wollastonite is filled with vinylester resin and same wollastonite was sprayed with coupling agent 1 % triethoxymethyl silane then filled with vinylester resin. The particle functionalization with a bi-functional coupling agent 1 % triethoxymethyl silane was observed to have a significant effect on the curing process and subsequent physical properties of the composites. Wollastonite functionalization favors the composite fabrication with a lower curing temperature as compared to the as-received particle filled vinyl ester resin composites. Thermogravimetric analysis showed an increased thermo-stability in the particles functionalized filled vinyl ester resin composites as compared to the unmodified particle filled counterparts. The uniform particle dispersion and the chemical bonding between filler and vinyl ester resin matrix were found to contribute to the increased thermal stability and enhanced tensile strength and modulus.
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Panin, Sergey V., Qitao Huang, Vladislav O. Alexenko, Dmitry G. Buslovich, Lyudmila А. Kornienko, Filippo Berto, Svetlana A. Bochkareva, Iliya L. Panov, and Natalya V. Ryabova. "Design of Wear-Resistant UHMWPE-Based Composites Loaded with Wollastonite Microfibers Treated with Various Silane Coupling Agents." Applied Sciences 10, no. 13 (June 29, 2020): 4511. http://dx.doi.org/10.3390/app10134511.

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The tribomechanical properties of the wear-resistant ultrahigh molecular weight polyethylene (UHMWPE)-based composites loaded with wollastonite microfibres silanized with various coupling agents (“KH-550”, “Penta-1006”, and “OTS”) were investigated. It was demonstrated that the mechanical properties of UHMWPE-based composites filled with various amounts of wollastonite (7–23 wt. %) increased by 1.3 times (yield strength) and by 1.8 times (elastic modulus), while the wollastonite silanization further improved yield strength by 9% in some cases. It was demonstrated that the composite loaded with 23 wt. % wollastonite silanized with the “KH-550” coupling agent possessed the maximum wear resistance under “moderate” conditions of tribological loading. Under “severe” conditions, the composites containing 23 wt. % wollastonite silanized with the less efficient “OTS” and “Penta-1006” agents showed the greatest wear resistance during dry sliding friction. Wear resistance significantly depended on filler weight fraction and the load–speed mode of the tribological tests. Based on the obtained experimental data on the mechanical (including impact toughness) and tribological properties of the UHMWPE-based composites loaded with wollastonite, the optimal compositions (the filler content and the type of the coupling agent) for two load–speed modes were designed using the developed computer algorithm. The composites provided the predefined high tribomechanical properties for operation in the metal-polymer friction units compared to neat polymer.
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Yuhaida, Ismail, Husseinsyah Salmah, Hanafi Ismail, and Zainuddin Firuz. "Tensile Properties of Wollastonite Filled High Density Polyethylene/Natural Rubber Composites." Applied Mechanics and Materials 754-755 (April 2015): 215–19. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.215.

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Wollastonite is one type of inorganic filler. The effects of wollastonite loading on tensile properties of wollastonite (WS) filled high density polyethylene (HDPE)/Natural Rubber (NR) composites was studied. The HDPE/NR/WS composites were prepared by using Brabender EC Plus at a temperature of 180 °C with rotor speed of 50 rpm for 10 min. It was found that the increasing of wollastonite loading had decreased the tensile strength and elongation at break, whereas the Young’s modulus of the HDPE/NR/WS composites had increased with the increasing of wollastonite loading.
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Abdul Karim, Ahmad Fikri, and Hanafi Ismail. "The effects of a compatibiliser on processing, tensile properties and morphology of polystyrene (PS)/styrene–butadiene rubber (SBR)/wollastonite composites." Polymers and Polymer Composites 26, no. 8-9 (October 2018): 454–60. http://dx.doi.org/10.1177/0967391118809436.

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Thermoplastic elastomer composites of polystyrene (PS) blended with styrene–butadiene rubber (SBR)–filled wollastonite were prepared using a laboratory scale internal mixer. The compatibiliser used in this study was maleic anhydride (MAH). The torque developments, morphology, and mechanical properties such as tensile strength, elongation at break, Young’s modulus and impact strength were studied. PS/SBR/wollastonite composites with the addition of MAH had higher torque than PS/SBR/wollastonite composites without MAH. Tensile strength, impact strength and elongation at break were reduced by increasing filler loading, both for composites with and without MAH. Composites with MAH had higher tensile strength but lower impact strength and elongation at break as compared with composites without MAH. The Young’s modulus increased with the wollastonite loading, whereas at a similar wollastonite loading, composites with MAH exhibited higher values of Young’s modulus than composites without MAH. Scanning electron microscopy on fracture surfaces showed better filler–matrix adhesion for composites with MAH.
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Dissertations / Theses on the topic "Wollastonite composites"

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Juhasz, Judith Agnes. "Development and characterisation of glass-ceramic apatite-wollastonite polyethylene composites." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619534.

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Stevens, Jason. "Material Properties of Wood Ash-Filled and Wollastonite-Filled Polyproplyene Wood Plastic Composites (WPCS)." Fogler Library, University of Maine, 2011. http://www.library.umaine.edu/theses/pdf/StevensJ2011.pdf.

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Archez, Julien. "Formulations de composites à base de liants basse température type géopolymère à base d'argilite et de différents renforts : réalisation d'une pièce par fabrication additive." Thesis, Limoges, 2020. http://aurore.unilim.fr/theses/nxfile/default/bd491a52-1855-4e0d-9b5b-6284748bb761/blobholder:0/2020LIMO0059_arch.pdf.

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Ce travail s’inscrit dans le cadre du projet Cigéo (Centre industriel de stockage géologique de déchets radioactifs) et étudie des voies d’optimisation pour les chemisages des alvéoles de stockage des déchets radioactifs de haute activité (HA). Des matériaux composites à matrice et renforts inorganiques sont une des voies d’innovation envisagées en alternative aux matériaux métalliques pour la réalisation du chemisage. L’utilisation de matériaux de type géopolymères renforcés par des éléments non organiques pourrait répondre aux critères souhaités. L’ajout de wollastonite et de fibres de verre à une matrice géopolymère a tout d’abord permis de contrôler la viscosité et de l’adapter à une mise en forme par coulage ou par fabrication additive tout en assurant une tenue mécanique satisfaisante du matériau consolidé. Des résistances mécaniques en compression et en flexion allant respectivement jusqu’à 101 MPa et 20 MPa ont pu être obtenues. Pour tester la solution extrudée à l’échelle ½, un système d’impression 3D a ensuite été développé. Une tête d’extrusion spécifique a été conçue et intégrée à une cellule robotique 6 axes. Le contrôle et l’identification des paramètres d’impression et des paramètres matériaux ont finalement permis la maitrise du pilotage du procédé et l’impression de structures en composite géopolymère à l’échelle ½ (ɸ = 35 cm)
This work is part of the Cigéo project (geological industrial disposal for radioactive wastes) and focuses on studying alternative materials for the elaboration of the lining of the high-level radioactive waste storage cells. Composites materials with inorganic matrix and reinforcements are one of the innovations being considered as an alternative to replace metallic materials in the lining. The use of geopolymers reinforced with inorganic elements could meet the desired specifications. The insertion of wollastonite and glass fibers to a geopolymer matrix allowed to control viscosity suitable for shaping by casting and additive manufacturing while ensuring the mechanical strength of the consolidated material. This allows obtaining flexural and compressive strengths going up to 101 MPa and 20 MPa, respectively. To shape the extruded solution at a half scale, a 3D printing system was then developed. A specific extrusion head has been designed and integrated into a 6-axis robotic cell. The control and identification of printing and materials parameters make it possible to control the process and to print geopolymer composite structures at half scale (ɸ = 35 cm)
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Kleczewska, Joanna. "Material aspects of exploitation of dental composites based on dimethacrylate resins." Thesis, Tours, 2011. http://www.theses.fr/2011TOUR4023/document.

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L’objectif de cette étude est de comprendre comment la morphologie des composites dentaires basés sur la résine diméthacrylate peut influer sur les propriétés des prosthèses dentaires. Les expériences ont été menées selon deux directions I ) Analyse des échantillons commerciaux 2) préparation des composites avec des nouveaux renforcements. La morphologie, le comportement tribologique et les propriétés mécaniques des couches superficielles ont été déterminés. Certains composites montrent une résistance à l’abrasion accrue pendant la première heure des mesures tribologiques. Ceci indique l’existence d’une couche superficielle de nature différente que le corps. Ce morphologie bimodale conduit à un meilleur arrangement des particules renforçant, résultant en une résistance à l’usure important et une ténacité élevée.Wollastonité est une alternative intéressante comme renforçant. L’ajout des agents bactéricide est efficace contre S. mutans, mais les propriétés mécaniques de ce composites doivent être améliorés
The aim of this study was an attempt to clarify, how the morphology of dimethacrylate-based dental composite affects the properties of dental fillings. The experiments were carried out bidirectionally: I). The analysis of commercial samples; 2). Preparation ofhome made composites with using of new fillers.Morphology, tribological behavior. mechanical properties of surface layer and bactericidal action of composites were characterized. Some composites exhibit an increased resistance to abrasion during the first hour of tribological measurements. It proves the existence of the “surface layer” of a different nature than the bulk of material.The ‘bimodal’ morphology favors the best packing of filler particles in the matrix, resulting in higher wear resistance and fracture toughness of composites. Wollastonite is an interesting alternative to the commonly used fillers. Addition of bactericidal agents is effective against S. mutans, however, mechanical characteristics of these composites require fine-tuning
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Ponsot, Inès. "Glasses and Glass-Ceramic Components from Inorganic Waste and Novel Processing." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424636.

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Thanks to European environmental rules and regulations establishment, waste recycling has become a more and more relevant problematic. For manufacturing plants, especially those producing hazardous wastes, expenses linked to waste production have drastically increased over the last decades. In the proposed work, various hazardous and non-hazardous wastes, among: soda-lime and borosilicate glass cullet, cathode ray tubes glass, exhausted lime from fume abatement systems residues, sludge and slags from ferrous and non-ferrous metallurgy, and pre-stabilized municipal solid waste incinerators ashes are used to elaborate several compositions of glass-ceramics. High-temperature treatment (minimum 800 °C) associated to a Direct Sintering process (30 min) was an efficient way to stabilize chemically the final products. The impact of each waste on the final product’s mechanical properties was studied, but also their synergies between each other, when mixed together. Statistic mixture designs enabled to develop interesting products for modern building applications, such as porous tiles and lightweight panels destined to insulation, with a purpose of fulfilling multifunctional properties.
Grazie alle regole e normative ambientali europee istituite, il riciclaggio dei rifiuti è diventato una problematica sempre più rilevante. Per gli impianti di produzione, in particolare quelli che producono rifiuti pericolosi, le spese connesse allo smaltimento sono drasticamente aumentate negli ultimi decenni. Nel lavoro proposto, vari rifiuti, pericolosi o no, vengono utilizzati per elaborare diverse composizioni di vetroceramiche. Si distinguono rottami di vetro della produzione di finestre, di contenitori farmaceutici e di tubi catodici. I rifiuti non vetrosi invece sono calce esausta da residui di sistemi di filtrazione di fumi, scorie metallurgiche da leghe ferrose e non e ceneri da inceneritori. E' presentata nel presente lavoro la ricerca di un metodo di trattamento ad alta temperatura (minima 800 ° C) efficace per stabilizzare chimicamente il prodotto finale, tramite i diversi processi di sinterizzazione diretta, sinter-cristallizzazione e vetrificazione. Sono stati studiati gli effetti di ogni rifiuto sulle proprietà meccaniche del prodotto finale, ma anche le nuove funzionalità ottenute attraverso le sinergie risultanti dalla loro miscela. Miscele calibrate hanno permesso di sviluppare prodotti interessanti per applicazioni edilizie moderne, come le piastrelle porose e pannelli leggeri destinati all’isolamento.
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Garhwal, Astha. "Studies on pc/sebs and sebs-g-ma blands and pc/sebs-g-ma/wollastonite composites." Thesis, 2017. http://localhost:8080/xmlui/handle/12345678/7425.

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Melo, P., A.-M. Ferreira, K. Waldron, Thomas Swift, P. Gentile, M. Magallanes, M. Marshall, and K. Dalgarno. "Osteoinduction of 3D printed particulate and short-fibre reinforced composites produced using PLLA and apatite-wollastonite." 2019. http://hdl.handle.net/10454/17910.

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Yes
Composites have clinical application for their ability to mimic the hierarchical structure of human tissues. In tissue engineering applications the use of degradable biopolymer matrices reinforced by bioactive ceramics is seen as a viable process to increase osteoconductivity and accelerate tissue regeneration, and technologies such as additive manufacturing provide the design freedom needed to create patient-specific implants with complex shapes and controlled porous structures. In this study a medical grade poly(l-lactide) (PLLA) was used as matrix while apatite-wollastonite (AW) was used as reinforcement (5 wt% loading). Premade rods of composite were pelletized and processed to create a filament with an average diameter of 1.6 mm, using a twin-screw extruder. The resultant filament was 3D printed into three types of porous woodpile samples: PLLA, PLLA reinforced with AW particles, and PLLA with short AW fibres. None of the samples degraded in phosphate buffered solution over a period of 8 weeks, and an average effective modulus of 0.8 GPa, 1 GPa and 1.5 GPa was obtained for the polymer, particle and fibre composites, respectively. Composite samples immersed in simulated body fluid exhibited bioactivity, producing a surface apatite layer. Furthermore, cell viability and differentiation were demonstrated for human mesenchymal stromal cells for all sample types, with mineralisation detected solely for biocomposites. It is concluded that both composites have potential for use in critical size bone defects, with the AW fibre composite showing greater levels of ion release, stimulating more rapid cell proliferation and greater levels of mineralisation.
The research was funded in part by the UK EPSRC Centre for Doctoral Training in Additive Manufacturing and 3D Printing (EP/L01534X/1), the UK EPSRC Centre for Innovative Manufacture in Medical Devices (EP/K029592/1), and Glass Technology Services Ltd., Sheffield, UK.
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"Early-Age Drying and Cracking Properties of Wollastonite-Textile Reinforced Cement Paste Composites." Master's thesis, 2014. http://hdl.handle.net/2286/R.I.25871.

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abstract: The main objective of this study is to investigate drying properties and plastic shrinkage cracking resistance of fresh cement-based pastes reinforced with fibers and textiles. Naturally occurring mineral wollastonite has been studied independently as well as in combination with AR-glass textile. A series of blended mixes with Portland cement and wollastonite nano-fibers were developed and tested under low vacuum conditions to simulate severe evaporation conditions and expedite the drying process causing plastic shrinkage cracks. Cumulative moisture loss, evaporation rates, and diffusivity were analyzed by means of a 2-stage diffusion simulation approach, developed previously in Arizona State University. Effect of fiber-matrix interaction on the transport properties of the composite were evaluated using the existing approach. Morphology of the cracked surface was investigated by the means of image analysis wherein length, width, area and density of the cracks were computed to help characterize the contribution of fiber and textile in the cracking phenomenon. Additionally, correlation between cumulative moisture loss and crack propagation was attempted. The testing procedures and associated analytical methods were applied to evaluate effectiveness of four wollastonite fiber sizes and also a hybrid reinforcement system with alkali-resistant glass (ARG) textile in improving shrinkage cracking related parameters. Furthermore, the experimental and analytical approach was extended to magnified version of the existing shrinkage testing set-up to study the size effect of these composites when subjected to matching drying conditions. Different restraining mechanisms were used to study the simulation of the cracking phenomena on a larger specimen. Paste and mortar formulations were developed to investigate size effect on shrinkage resistance of cementitious composites.
Dissertation/Thesis
Masters Thesis Civil Engineering 2014
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Mohan, Sharma Arathi. "Mechanical Behaviour, Water Absorption and Morphology of Wheat Straw, Talc, Mica and Wollastonite filled Polypropylene Composites." Thesis, 2012. http://hdl.handle.net/10012/6772.

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Polypropylene continues to be the mainstream choice thermoplastic for automotive applications. In many applications PP is filled with mineral fillers for improvement of properties. Biobased natural fillers or fibres are attractive materials to reduce the weight because of the low specific gravity of the biobased materials compared to the mineral fillers. Our group has done extensive research on the development of wheat straw fiber in thermoplastics in the past years. It is very important to understand the behaviour of single fillers on composites before studying the effects of mixing fillers or fibers (hybridization). The objective of this study is to evaluate and compare systematically the effects of wheat straw and mineral fillers in the polypropylene matrix. The study includes two types of wheat straw (WS) categorized based on their size (fine WS and medium WS) and three different types of natural minerals (Talc, Mica and Wollastonite). Three types of polypropylene (PP), Homopolymer PP, High Impact Copolymer PP and Homopolymer-Copolymer Blend PP, were investigated as the matrix. This study also evaluates the effect of combining two fillers (WS and mineral filler) in the hybrid composite. The fillers were formulated in three different percentages (20, 30 and 40wt %) and compounded via extrusion. Samples for all formulations were prepared by injection molding. The mechanical properties (flexural modulus and strength, tensile modulus and strength, impact strength), water absorption and density were measured. The properties of hybrid composites were evaluated by varying the amounts of two fillers at 10wt%-20wt%, 15wt%-15wt% and 20wt%-10wt% each, keeping the overall filler content constant at 30wt%. The effect of type of filler, filler size and filler content were critical in this work. The results obtained from this study indicated that filler type and filler content greatly influenced the mechanical properties and water absorption characteristics of the composites. The flexural modulus increased with increasing filler content. It was interesting to observe that though the impact strength decreased with the addition of fillers, increasing the filler content from 20 to 40 wt% did not affect the property. With respect to all fillers, wollastonite improved the mechanical properties significantly. Increasing the amount of WS content reduced the composite’s resistance to water absorption. Among mineral fillers, mica showed significantly higher percentage gain in weight with water absorption. Combination of fillers at varying percentages did not have any synergy effect on the mechanical behaviour of the composite. The percentage increase in weight with water absorption was observed to be increasing with increasing WS content in hybrid composites, but significantly lower than pure WS composites. The morphological study on WS composites revealed improved interaction of filler with homopolymer and polypropylene blend.
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Book chapters on the topic "Wollastonite composites"

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Zilles, Joerg Ulrich. "Wollastonites." In Encyclopedia of Polymers and Composites, 1–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37179-0_4-5.

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Yuan, Xiao Wen, Debes Bhattacharyya, and Allan Easteal. "Effect of Coupling Agents and Particle Size on Mechanical Performance of Polyethylene Composites Comprising Wollastonite Micro-Fibres." In Advances in Composite Materials and Structures, 265–68. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-427-8.265.

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Zilles, Joerg Ulrich. "Wollastonites." In Polymers and Polymeric Composites: A Reference Series, 1–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-37179-0_4-6.

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Yamaguchi, Seiji, and Takeshi Yao. "Development of Bioactive Alumina-Wollastonite Composite by Electrophoretic Deposition." In Bioceramics 17, 863–68. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-961-x.863.

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Bastan, F. E., O. Karaarslan, G. Erdogan, and F. Ustel. "Investigation of Bond Strength of Spray Dried Hydroxyapatite-Wollastonite Composite Powder After Plasma Spray." In Machining, Joining and Modifications of Advanced Materials, 79–86. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1082-8_8.

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"Wollastonite-Reinforced Polypropylene." In Handbook of Polypropylene and Polypropylene Composites, Revised and Expanded, 601–20. CRC Press, 2003. http://dx.doi.org/10.1201/9780203911808-23.

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Järvelä, P. K., P. A. Järvelä, J. C. Le Bell, and P. Törmälä. "EFFECT OF HUMIDITY AND TEMPERATURE ON THE PROPERTIES OF WOLLASTONITE FILLED POLYAMIDE 6." In Composites Evaluation, 222–28. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-408-02569-0.50031-3.

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Galea, N., P. Hamedanimojarrad, K. Vessalas, and P. Thomas. "Assessment of wollastonite microfibre on drying shrinkage behaviour of cement-based composites." In From Materials to Structures: Advancement through Innovation, 499–504. CRC Press, 2012. http://dx.doi.org/10.1201/b15320-87.

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Conference papers on the topic "Wollastonite composites"

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"Toughening of Cement Composites with Wollastonite Micro-Fibers." In SP-319: Reduction of Crack Width with Fiber. American Concrete Institute, 2017. http://dx.doi.org/10.14359/51700859.

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Yılmaz, Muhammed, Melih Savran, Mustafa Öncül, and Kutlay Sever. "Manufacturing and Modeling of Hybrid Polymer Composites by Using Multiple-nonlinear Regression Analysis." In International Students Science Congress. Izmir International Guest Student Association, 2021. http://dx.doi.org/10.52460/issc.2021.035.

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In this study, artichoke stem particles (AS) and wollastonite mineral (W) were used as an organic and inorganic fillers in order to improve the mechanical properties of polypropylene (PP). In this regard, PP-based composites containing AS and W were produced as non-hybrid and hybrid materials using a high-speed thermokinetic mixer. Mechanical properties of polymer composites were investigated by the tensile test. Experimental results reveal that the highest elastic modulus for PP-W and the highest tensile strength for PP were obtained while the lowest ultimate strain value was gained using PP-W-A. Then, multiple nonlinear regression analysis was employed to determine the effect of weight ratios of wollastonite mineral and artichoke stem particles in polypropylene on elastic modulus, tensile strength and ultimate strain. Experimental results were expressed second order (tensile strength), third order (elastic modulus) and fourth order (ultimate strain) mathematical models. The results show that the proposed models have well fitted with the experimental results. The coefficient of determination (R2) values were found between 0.95 and 1 in all models. Also, boundedness check control of the proposed models which gives information about whether models are realistic or not was carried out by calculating the maximum and minimum values produced by the relevant model.
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Vitorino, Fabrício de C., and Romildo D. Toledo Filho. "Uniaxial and Triaxial Stress-Strain Behaviour of Ductile Cement Pastes Reinforced With Wollastonite Microfibers." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11536.

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When an oil well is submitted to cyclic steam injection the heating process induces tensile stresses in the cement sheath due to the thermal gradient that take place leading to cement-steel debonding and/or cement cracking. Similar problem can occur if the cement sheath is submitted to high creep deformations coming from the adjacent rock (this is the case for example of oil exploration in salt domes). In both cases sheath cracking can result in loss of hydraulic isolation and consequently in excessive water production with undesired economic and environmental consequences. In order to deal with this challenging scenario oil well cementing systems of special properties (e.g. high tensile strength, low elastic modulus and elevated toughness) should be used as an alternative to conventional high compressive strength systems. In this study cement pastes of high ductility were developed using wollastonite micro-fibers as reinforcement. The mixtures were developed within the framework of the Compressive Packing Model [1] and wollastonite microfibers were added in volume fractions of 2.5, 5.0 and 7.5 %. Uniaxial and triaxial compressive tests were carried out to obtain the unconfined and confined stress-strain behavior of the composites. The crack initiation stress and strain and the fracture process of the pastes under unconfined stress will be reported in this paper. Triaxial tests were performed under confining pressures of 0, 600 and 1200 psi and the Mohr-Coulomb criteria assumed to determine the internal frictional angle and cohesion. The results show that the addition of wollastonite microfibers increased the compressive strength of the pastes keeping the same strain capacity of the matrix. The internal frictional angle was also increased with the increase in the fiber volume fraction. However, the cohesion of the paste was reduced with the fiber addition.
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Liu, X., Y. Xie, and C. Ding. "Bioactivity of Plasma Sprayed Calcium Silicate/ZrO2 Composite Coatings." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0393.

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Abstract In this work, 30wt% calcium silicate, including wollastonite and dicalcium silicate, were mixed with 70wt% ZrO2, respectively. The composite powders were deposited onto Ti-6Al-4V substrates to prepare wollastonite/ZrO2 and dicalcium silcate/ZrO2 composite coatings using plasma spraying technology. The bioactivity of coatings was evaluated using simulated body fluid soaking test. After the composite coatings were soaked in simulated body fluid for a certain period, apatite was formed on the surface of the wollastonite/ZrO2 and dicalcium silcate/ZrO2 composite coatings. In addition, the ZrO2 in composite coatings may protect the calcium silicate in the coatings from dissolving in simulated body fluid.
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Ding, Chuanxian, Xuanyong Liu, and Xuebin Zheng. "Bioactivity and Biocompatibility of Plasma Sprayed Ceramic Coatings." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0215.

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Abstract Wollastonite and its composite coatings with zirconia and titania have been deposited by plasma spraying. The bioactivity of coatings was evaluated using a simulated body fluid soaking test. The fetal rat’s osteoblasts were seeded on the surface of the coatings to examine their biocompatibility. The SEM and XRD technologies were used to examine the morphologies, structure and composition of the surface of the coatings soaked in the simulated body fluid. The results obtained showed that carbonate-containing hydroxyapatite was formed on the surfaces of wollastonite, wollastonite/ZrO2 and wollastonite/TiO2 coatings, while was not formed on the surfaces of ZrO2 and TiO2, indicating the wollastonite improved the bioactivity of ZrO2 and TiO2 coatings. Osteoblasts are able to survive and proliferate on the surfaces of wollastonite, wollastonite/ZrO2 and wollastonite/TiO2 coatings. It is enough to prove that these coatings possess excellent biocompatibility.
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Liu, X., and C. Ding. "Cytocompatibility of Plasma Sprayed Bioceramic Coatings." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0600.

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Abstract In this paper, the Al2O3, ZrO2, TiO2, wollastonite, dicalcium silicate and their composite coatings were deposited onto Ti-6Al-4V substrates by an atmosphere plasma spray system. The rat osteoblasts were seeded onto the surface of the coatings to evaluate the growth behavior of osteoblasts on different implant materials. Scanning electron microscopy was used to observe the morphologies of the osteoblasts seeded on the surface of the coating for different time. The SEM observation indicated the osteoblasts are difficult to survive and proliferate on the Al2O3 coating surface. Osteoblasts can survive and proliferate slowly on the TiO2 and ZrO2 coating surface. Osteoblasts grow and proliferate very well on the surface of the wollastonite and dicalcium silicate coating, which present the two coatings possess excellent cytocompatibility. The addition of wollastonite and dicalcium silicate into ZrO2 and TiO2 can improve their cytocompatibility.
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Nied, Eric P., Jeffrey P. Bons, and Ryan K. Lundgreen. "Unpacking Inter-Mineral Synergies and Reactions During Dust Deposition in an Impingement Coolant Jet." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82304.

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Abstract This paper seeks to unpack the synergies that exist between minerals during deposition of the heterogeneous AFRL02 mixture in gas turbine engines and demonstrate that the contributions of each mineral cannot be considered independently of others. In each experiment, one gram of a mineral dust (0–10μm particle diameter distribution) was injected into an 894K, 57m/s coolant flow impinging normally on a Hastelloy X plate with a surface temperature of 1033K, 1144K, or 1255K. Capture efficiency measurements, deposit morphology analyses, and X-ray diffraction results are reported. Besides AFRL02, single mineral dusts, dual mineral dusts, and AFRL02-like dust blends lacking in one mineral were tested. The results of the experiments elucidate that the deposition behavior of single minerals indeed cannot explain the composite deposition of heterogeneous mixtures of minerals. For example, gypsum had the highest capture efficiency of any single mineral in ARFL02, and yet removing gypsum from AFRL02 counterintuitively raised the capture efficiency of that blend when compared to AFRL02. Quartz was found to erode albite deposits but stick to and build upon dolomite and halite deposits, even though quartz did not deposit significantly as a single mineral. Quartz also chemically reacted with gypsum and dolomite to form wollastonite and diopside, respectively. Finally, we found that the capture efficiency of each blend increased with plate temperature, but not according to the same trend. Results are interpreted through the lens of CaO-MgO-Al2O3-SiO2 eutectic chemistry, but the chemical pathways by which these eutectics come into existence is found to be of equal importance.
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