Particulate Composites: Particulate Composites I
Sponsored by: MS&T Organization
Program Organizers: Ivi Smid, Penn State; James Foley, Los Alamos National Laboratory; Ravi K. Enneti, Global Tungsten and Powders Corporation
Wednesday 10:00 AM
October 19, 2011
Room: C115
Location: Greater Columbus Convention Center
Session Chair: Ivi Smid, Penn State
10:00 AM
Advanced Powdermetallurgical Technologies to Manufacture Metal Matrix Composites: Thomas Weissgaerber1; Thomas Hutsch1; Thomas Schubert1; Bernd Kieback1; 1Fraunhofer Institute IFAM Dresden
Powder Metallurgy offers the possibility to combine a large variety of materials. That’s why new properties and combination of properties can be achieved and materials which cannot be prepared my melting technology can be obtained. In addition to conventional pressure less sintering several pressure assisted techniques were developed in the past to manufacture composites having new composition or improved properties due to unique microstructures.The paper will focus on metal-carbon composites with interesting thermo physical, damping or mechanical properties. The carbon source can be graphite, diamond or carbon nanofibers. Fast sintering technologies like spark plasma sintering can be used to avoid undesired reactions between the constituents or to tailor the reaction to obtain new microstructures and properties. In case of carbon nanofibres subsequent forming operation can lead to 1D orientation of fibres and consequently to anisotropic properties.
10:40 AM
The Effects of Sand Size on the Abrasion Resistance of Alloys and Tungsten Carbide-Based MMC Overlays: Gary Fisher1; Tonya Wolfe1; John Wolodko1; 1Alberta Innovates - Technology Futures
Typically, standard alloys do not have the wear resistance properties necessary to combat the aggressive wear and corrosive conditions prevalent throughout the oil sands mining process. For production-critical components, it is common to apply tungsten carbide-based metal matrix composite (WC-MMC) overlays to extend equipment life and prevent unplanned outages. The performance of composite overlays is very much dependent on the wear-environment. This paper will discuss how the interactions between abrasive conditions and the mechanical and structural properties of the WC-MMCs are key in determining the resultant levels of performance. Such information can lead to a better selection of materials and subsequent extended component life.
11:00 AM Student
Comparative Evaluation of Tensile Bond Strength & Microleakage of Prime & Bond NT & Gluma Comfort Bond: An In-Vitro Study: Abhishek Kirpal1; Rahul Bhola1; Sonya Kirpal2; Vinod Gujral2; 1School of Dentistry; 2EnviroHealth Research Labs
The objective of the study was to comparatively evaluate the tensile bond strength and microleakage of Prime & Bond NT and Gluma Comfort Bond. Sixty teeth were taken and randomly divided into two groups, Group A for tensile bond strength and Group B for microleakage testing. Group A was further divided into two groups, Group I (Prime & Bond NT) and Group II (Gluma Comfort Bond). In this study, it was concluded that the tensile bond strength of Group I was higher than that of Group II. Prime & Bond NT showed lower microleakage at both gingival and occlusal margins. Both intra and inter group comparisons showed higher values for microleakage at gingival margins as compared to occlusal margins. In-vitro testing suggests better bonding properties and less microleakage for Prime & Bond NT over Gluma Comfort Bond.
11:20 AM Cancelled
Preparation of Octahedral Silver-Copper Alloy Powders: Qunyan Wei1; Depeng Zhao1; Jienan Qiu1; Hong Guo1; 1Yunnan university,School of Chemstry Science and Technology
The paper used polyethylene glycol as a solvent and reducing agent, appropriate organic template to control the powders morphology. The scanning electron microscopy (SEM) pictures of the powders displayed that octahedral crystal silver-copper alloy powders have been obtained, The influences of silver-copper molar ratio, reaction temperature and the organic template on the orienting growth of the particles has been discussed .
11:40 AM Break