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Fabrication and Characterisation of Bronze Pads and Comparison with Commercial Bronze Pads

100%
Demir A.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 4
880-882
EN
CuSn10 pre-alloyed bronze with iron and graphite powders were mixed, pressed and sintered for the bronze pad fabrication. The powder mix was pressed under pressure in the range of 100-600 MPa and sintered at temperatures between 780-850°C. The optimum compression was at 500 MPa and the optimal sintering temperatures was 730°C. 2 wt.% of graphite addition was sufficient to adjust the friction and wear properties of produced bronze pad samples. Optical microscope and SEM images showed that a homogenous powder mix was achieved. The produced bronze samples and the commercial ones were compared and beneficial properties of them were determined. The wear behaviours of both the produced friction materials and the commercial pads were examined. The coefficient of friction and wear rates were determined. The sintered bronze samples and the commercial bronze pads have exhibited similar wear behaviour, although the commercial one have contained ceramic particles.
2
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Surgical treatment of nictitans gland prolapse and cartilage eversion accompanying the nictitating membrane (third eyelid) rotation in cats

71%
Demir A., Altundağ Y., Demir A., Altundağ Y.
Polish Journal of Veterinary Sciences
|
2020
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vol. 23
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issue 4
3
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Single Pulse Laser Ablation of AISI 316L Stainless Steel Surface Using Nd:YAG Laser Irradiation

51%
Demir P., Kacar E., Akman E., Demir A.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 2
439-441
EN
The interaction of single-pulse Nd:YAG laser, operating at 1064 nm wavelength and 6 ns pulse duration, with AISI 316L stainless steel target surface was investigated experimentally and theoretically. Surface modification of stainless steel using laser irradiation was studied by observing the effects of varying incident laser pulse intensities on surface morphology. Surface structure of laser treated stainless steel was determined by optical microscopy and profilometry analyses. Numerical calculation by heat transfer equation was performed for single laser pulse irradiation. The results, obtained by theoretical and experimental processes, of the interaction between single-pulse Nd:YAG laser irradiation and AISI 316L stainless steel target surface are reported.
4
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The Effect of Reinforcement Ratio on the Wear Behaviour of AlB_2 Flake Reinforced Metal Matrix Composites

51%
Kayikci R., Savaş Ö., Koksal S., Demir A.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
590-592
EN
Aluminium-boride composites (Al-AlB_2) having two different volume fractions of reinforcing (AlB_2), namely 4.0 and 10.0 per cent have been produced through synthesizing boron by reaction of boron oxide (B_2O_3) with liquid aluminium. Friction and wear characteristic of the composites have been investigated under dry sliding condition and results compared with pure aluminium. The wear rate increases with normal load and sliding speed and is significantly lower with the composites when compared to that of monolithic material. The coefficient of friction increased with increasing volume fraction of AlB_2 reinforcement phase. The wear rate, however, decreased with increasing volume fraction of AlB_2.
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