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Influence of filler amount and content on the mechanical performance of joints bonded with metal powder filled adhesive

Kavak N. | Altan E.

Conference Object | 2014 | Materials Science Forum773-774 , pp.226 - 233

The objective of this study is to investigate the surface roughness that effect the capability of adhesive with adding aluminium powder and 63/37 Sn-Pb soft solder powder to the epoxy to increase the mechanical strength of joints. The adhesive strength of the joints was determined by utilizing the single-lap shear test. As seen from the experiments, the surface roughness has an important effect on the strength of adhesive bonded joints. Experimental results show that joints prepared by adhesive which was modified, adding in the amount of 5 wt% 63/37 Sn-Pb powder have more mechanical strength than joints compared to one which is prep . . .ared by adding aluminium powder with different ratios as 5, 25,50 wt%. © (2014) Trans Tech Publications, Switzerland Daha fazlası Daha az

Synthesis of multi-walled carbon nanotube-zirconia composite and bovine serum albumin adsorption characteristics

Bozgeyik K. | Kopac T.

Conference Object | 2017 | Materials Science Forum900 MSF , pp.27 - 31

Multi-walled carbon nanotube-zirconia composite (MWNT-ZrO2) was synthesized by a simple in situ chemical precipitation method. Adsorption of bovine serum albumin (BSA) from aqueous solution on the MWNT-ZrO2 composite was studied using batch technique at different pH and temperatures. The adsorption equilibrium and kinetic data were analzed using different models. The adsorption isotherm data could be described by both of the Langmuir and Freundlich adsorption models. Adsorption kinetics followed the pseudo-first-order rate model. MWNT loading improved the surface and the BSA adsorptive characteristics of zirconia. © 2017 Trans Tech . . .Publications, Switzerland Daha fazlası Daha az

Microstructural and mechanical properties of nano-yttria-oxide doped hydroxyapatite composites

Gunduz O. | Yetmez M. | Ekren N. | Kilic O. | Ben-Nissan B. | Oktar F.N.

Conference Object | 2018 | Materials Science Forum923 MSF , pp.89 - 92

Nowadays hydroxyapatite (HA) bioceramics are very important because increasing traffic accidents and ageing of the population. They can be produced from synthetic or natural sources with different production methods. The biggest negative issue of HA is being very brittle and unstable under pressure. Various materials are added for restoring these weaknesses, but there is not so much studies adding nano-ingredients for restoring the mechanical properties of HA. In this study, 5-10% nano-yittria-oxide is added to bovine derived HA (BHA) and to commercial synthetic (CSHA) as a control group. Physical and mechanical properties are exami . . .ned. Results show that adding of nano-ingredients are really helping to mechanical properties of HA. © 2018 Trans Tech Publications, Switzerland Daha fazlası Daha az

Modal stress analysis of a cracked woven composite beam under compression

Yetmez M.

Conference Object | 2018 | Materials Science Forum917 MSF , pp.316 - 320

In this study, modal stress analysis of carbon fiber plain weave cracked composite beams under compression is considered. General-purpose finite element code MSC. Marc is used for the finite element beam models. Before understanding the compression effect on the beam, dynamic characteristics of the models are compared with the experimental evaluations. Investigation of quasi-static and dynamic (equivalent von Mises stress and elastic strain energy density) behavior of the plain weave cracked beams with two different thicknesses under compression is examined numerically. Results are given in tabular and graphical form. © 2018 Trans T . . .ech Publications, Switzerland Daha fazlası Daha az

Vacuum heat treatment of MgO-densified pressureless sintered silicon nitride ceramics

Demir V. | Thompson D.P.

Conference Object | 2007 | Materials Science Forum554 , pp.107 - 112

Silicon nitride samples were pressureless sintered with up to 5 w/o MgO to give densities in the range 98-99% of theoretical. After pressureless sintering, selected samples were placed in a vacuum heat treatment furnace surrounded by a carbon bed in a carbon crucible at a pressure of less than 4×10 -4 mbar, and vacuum heat treated at different temperatures and times to remove grain-boundary glass. The results showed that this was substantially achieved at 1575°C for 3h and that increasing the time to 5 hours gave still further improvement. SEM images, EDX analysis and oxidation tests provided additional evidence for the removal of M . . .g from the samples Daha fazlası Daha az

Effect of repeated quenching heat treatment on microstructure and dry sliding wear behavior of low carbon PM steel

Güral A. | Tekeli S. | Özyürek D. | Gürü M.

Conference Object | 2007 | Materials Science Forum534-536 ( PART 1 ) , pp.673 - 676

The effect of repeated quenching heat treatment on microstructure and dry sliding wear behavior of low carbon PM steel was investigated. For this purpose, atomized iron powder was mixed with 0.3 % graphite and 1 % Ni powders. The mixed powders were cold pressed and sintered at 1200°C for 30 min under pure Ar gas atmosphere. Some of the sintered specimens were intercritically annealed at 760°C and quenched in water (single quenching). The other sintered specimens were first fully austenized at 890°C and water quenched. These specimens were then intercritically annealed at 760°C and re-quenched in water. The martensite volume fraction . . . in the double quenched specimens was higher than that of the single quenched specimen. Wear tests were carried out on the single and double quenched specimens under dry sliding wear condition using a pin-on-disk type machine at constant load and speed. The experimental results showed that the wear coefficient effectively decreased in the double quenched specimen Daha fazlası Daha az

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