Characterization of Minerals, Metals, and Materials: Composites
Sponsored by: TMS Extraction and Processing Division, TMS: Materials Characterization Committee
Program Organizers: Shadia Ikhmayies, Al Isra University; Bowen Li, Michigan Technological University; John Carpenter, Los Alamos National Laboratory; Jian Li, CanmetMATERIALS; Jiann-Yang Hwang, Michigan Technological University; Sergio Monteiro, Military Institute of Engineering ; Firrao Donato, Collegio Universitario, Italy; Mingming Zhang, ArcelorMittal Global R&D; Zhiwei Peng, Central South University; Juan P. Escobedo-Diaz, UNSW Australia; Chenguang Bai, Chongqing University; Eren Kalay, METU; Ramasis Goswami, Naval Research Laboratory; Jeongguk Kim, Korea Railroad Research Institute

Thursday 8:30 AM
March 2, 2017
Room: 31A
Location: San Diego Convention Ctr

Session Chair: Jiann-Yang Hwang, Michigan Technological University; Marcos Fernandes, USP; Jean Margem, UENF UNIVERSITY STATE NORTHERN RIO DE JANEIRO

8:30 AM  
Study on Mechanical Property of Porous Titanium by Adding Powder TiB2: Lu TengFei1; 1College of Materials Science and Engineering,Chongqing University
    Porous Ti/TiB matrix composites with porosity of 40 have been successfully prepared by powder metallurgical technology(PMD) using urea as spacer. The green samples were heated under 450℃ for 1.5h to completely remove urea and then sintered in the high vacuum furnace under 0.1Pa at 1200℃ and held at that point for 2h. Compressive behavior of final products with different content of TiB2 was investigated. The yield strength and Young’s modulus were in the range of 120-180MPa and0.3-0.9GPa respectively. The results manifested that the compressive strength of porous Ti/TiB matrix composites could be effectively improved Because of the existence of TiB.

8:50 AM  
Portland Cement-Fique Fibers Composites: Henry Colorado1; Frederico Muylaert Margem2; Sergio Monteiro3; 1Universidad de Antioquia; 2Universidade Estadual do Norte Fluminense Darcy Ribeiro; 3Military Institute of Engineering, IME
    Fique fiber is a green renewable resource with traditional uses such bags, art, and ropes. Other interesting applications such as materials reinforcement are not fully been developed. In this investigation, fique fibers from Colombia were added as long unidirectional fibers to ordinary Portland cement paste. Weibull statistics on the strength of the samples not only carried out over the composites but also in the fibers itself are presented. Optical and scanning electron microscopy, and density tests are also presented. Preliminary thermal and water stability tests are also presented.

9:10 AM  
High Thermal Conducting Composites Using Percolation Theory: Kenji Monden1; 1Denka Co., Ltd.
    Thermal solution composites are made by incorporating dense inorganic fillers with high thermal conductivity into resin. The influence of percolation cannot be ignored in composite materials with high volume fraction of fillers. When percolation by random filling is assumed, the thermal conductivity of composite materials is expressed by the following formula : λcm0(Vf-Vp)k ( Vf > Vp ). Here, k is the critical index, Vp is the percolation threshold volume fraction, λm is the thermal conductivity of resin and λ0 is the effective thermal conductivity of filler. In the case of irregular AlN filler with average particle size 45μm, λ0 becomes 20Wm-1K-1. If the thickness of the interfacial region can be lowered, an effective thermal conductivity of the filler grows larger. The BN constitute the matrix of composite by causing percolation without interfacial region, high thermal conductivity of 55-100Wm-1K-1 has been achieved.

9:30 AM  
Sorption Characteristics of Low Density Polyethylene/Kola Nut Composite: Genevive Onuegbu1; Gerald Onyedika1; Martin Obidiegwu1; 1Federal University of Technology, Owerri
    The effect of kolanut(KN) filler and compatibilizer (maleic anhydride) contents on the transport of toluene through low density polyethylene(LDPE) and low density polyethylene composite were studied at the temperatures 400C,600C and 800C .The kolanut powdered used was ground to 25µm particle size. 0-5Wt% of kolanut powder and 0-2.5Wt.% of compatibilizer were mixed with 200g of low density polyethylene in an injection moulding machines. The injected polyethylene and polyethylene/kolanut composites (LDPE/KN) were taken for sorption test. The sorption data obtained for low density polyethylene and kolanut powder filled low density polyethylene at the different temperature investigated were expressed as the molar percentage uptake (%Qt) of toluene per gram of the kola nut composites.

9:50 AM Break

10:05 AM  
Tensile Behavior of Epoxy Matrix Composites Reinforced with Pure Ramie Fabric: Caroline Gomes de Oliveira1; Janine Feitosa de Deus1; Ygor Macabu de Moraes1; Marcos Vinícius Fonseca Ferreira1; Frederico Margem Muylaert2; Sérgio Neves Monteiro3; Luiz Gustavo Xavier Borges2; 1UENF - Universidade Estadual do Norte Fluminense; 2Faculdade Redentor; 3IME - Instituto Militar de Engenharia
    Recently, the natural fibers have been studied as alternative reinforcement material to the use of synthetic fibers. Aiming to improve the properties of natural fibers composites, it is investigated the use of natural fibers fabrics, since they provide multidirectional reinforcement and enables the introduction of a larger fiber volume fraction. In this work, it was investigated the tensile behavior of the epoxy matrix composites reinforced with different volume fractions of Ramie fabrics. The specimens were made by cutting the fabric in the mold format and then pressing the fabric with liquid resin to garantee a total impregnation. Finally, the fabric layers were placed into the mold with the liquid resin and catalyst. They were cured for 24 hours and then tested. The results revealed a decrease in the tensile resistance with the increase of fabric volume fraction, probably due to the delamination effect caused by the fabric.

10:25 AM  
Hemp Fiber Density Using the Pycnometry Technique: Lázaro Rohen1; Frederico Margem1; Sérgio Monteiro2; Anna Neves1; Carlos Vieira1; Janaina Vieira1; Dhyemila Mantovani1; Jean Margem3; 1State University of Northern of Rio de Janeiro; 2Military Institute of Engineering; 3ISECENSA
    The lower density of the lignocellulosic fibers such as the hemp fibers and the other natural ones is one of the characteristics that allow the scientists to obtain high levels of specific properties that when compared to the properties of ordinary reinforcements gives to the hemp fibers an advantage as a material with an expressive potential in the mechanical properties area. Then, the aim of this present work is to characterize the relative density of the hemp fiber related to the water using the pycnometry technique. This technique uses the pycnometer and it is divided in two steps. In the first step the correction factor and the moisture content of the fresh hemp fiber specimen and in the other step some weightings were done such as the dry specimen (g), empty pynometer (g), pycnometer + water (g) and pycnometer + water + specimen (g) using a digital balance with a precision scale of 0,001g of the bran INNERSCAN. Based on these measurement and calculations using some formulations already established in previous studies, the relative density of the hemp fiber found was around 1.393 g/cm³ and the moisture content around 7.1%.

10:45 AM  
Bending Tests in Polyester Composites Reinforced with Palf Fibers: Maria Carolina Teles1; Frederico Margem2; Sergio Neves3; 1State University of the Northern Rio de Janeiro; 2Faculdade Redentor; 3Instituto Militar de Engenharia
    Composites reinforced with long and aligned fibers are those which have the best mechanical performance compared to other types of composite.The Palf fiber, a relatively unknown lignocellulosic fiber with potential for composite reinforcement, still needs to characterize for possible engineer applications. In this work, polyester matrix composites incorporated with continuous and aligned Palf fibers were tested for their flexural behavior. Specimens with up to 30% in volume of fibers were bend-tested until rupture. The fractured samples were analyzed by SEM and the tests were done in the Instron machine. The results show that there is a linear relationship between the volume of fiber and the bending stress, in other word, the greater the amount of fiber, the greater bending stress .

11:05 AM  Cancelled
Influence of EB Radiation on the Mechanical Properties of Organic Bentonites-HIPS Nanocomposites: Francisco Mondelo Garcia1; Amanda Roban1; Giselle Colls1; Jesus Eduardo Ruiz2; Esperidiana Moura3; Maria das Graças Valenzuela4; Tania Moliner1; Jose Luis Valin Rivera5; Francisco Valenzuela-Diaz5; 1Instituto Superior Politecnico Jose Antonio Echeverria; 2Centro de Biomateriales Universidad de la Habana; 3Instituto de Pesquisas Energeticas e Nucleares; 4Universidade Federal do ABC; 5Universidade de Sao Paulo
    Bentonites are an important kind of clays having a wide range of applications. An important new use for bentonites is as fillers in polymer nanocomposites. In this work a Brazilian bentonite, from the state of Paraiba, was subjected to an organophilization treatment. Before and after the surface modification the bentonite was characterized by techniques such as XRD, IR, SEM, XRF and swelling capacity in different types of liquids. The organophilyzed bentonite presented high swelling in organic solvents. Nanocomposites of high impact polystyrene/organophilic clay , containing 5% of clay by weight, were prepared with a twin screw extruder and specimens were formed by injection. The nanocomposites before and after being subjected to electron beam irradiation were characterized by techniques such as XRD, IR, SEM, and TGA. The mechanical properties were evaluated by tensile strength and impact tests. Irradiated materials showed considerable increases in tensile strength.

11:25 AM  
Preparation and Characterization of Clay Exfoliation and Vegetal Fibre on Properties of Recycled Low Density Polyethylene (rLDPE): Amauche Achusim-Udenko1; Coida Renata2; Francisco Valenzuela-Diaz2; Gerald Onyedika1; Moura Esperidiana3; Martin Ogwuegbu1; Graca Valenzuela3; 1Federal University of Technology, Owerri; 2Universidade de São Paulo Escola Politenica; 3Instituto de Pesquisas Energetics e Nucleares _IPEN-CNEN/SP
    This work aims to incorporate Mgbee clay, vegetal fibre (Costus afer) in recycled low density polyethylene (rLDPE).The incorporation of clay and vegetal fibre in rLDPE was carried out using a twin screw extruder machine and the nano composites were obtained. The nano composites were characterized by the young modules test, tensile tests, bending test, XRD,SEM, DSC, and TG and other properties evaluated. The results of morphological and thermal properties showed a good interaction between the clay, and rLDPE as compared to neat rLDPE.