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welding non-conformities]. 8. PN-EN ISO 9015-2:2016-04, Badania niszczące złączy spawanych metali – Badanie twardości – Część 2: Badanie mikrotwardości złączy spawanych łukowo [Destructive tests of the welded metal joints – Hardness testing – Part 2: Microhardness testing of the arc-welded joints]. 9. Woźny P., Błachnio J., Quality requirements regarding aircraft maintenance and repair service. Research Works of Air Force Institute of Technology, No. 35, 2014. 10. Woźny P., Qualitative analysis of maintenance and services carried out in a repair plant on the example of

References [1] Przybyłowicz K., Teoria i praktyka borowania stali. Wyd. Politechniki Świętokrzyskiej, Kielce, 2000. [2] Pertek A., The Structure Formation and the Properties of Boronized Layers Obtained in Gaseous Boriding Process, Dissertation no. 365, Publishing House of Poznan University of Technology, Poznan, 2001. [3] Uslu I., Comert H., Ipek M., Ozdemir O., Bindal C., Evaluation of borides formed on AISI P20 steel. Materials and Design, 28 (2007) 55 - 61. [4] Calik A., Simsek M., Karakas M.S., Ucar N., Effect of boronizing on microhardness and wear

i wybrane właściwości stali konstrukcyjnej. Journal of Research and Applications in Agricultural Engineering, 1 (2013) 147-150. [5] Uslu I., Comert H., Ipek M., Ozdemir O., Bindal C., Evaluation of borides formed on AISI P20 steel. Materials and Design, 28 (2007) 55 - 61. [6] Calik A., Simsek M., Karakas M.S., Ucar N., Effect of boronizing on microhardness and wear resistance of steel AISI 1050 and chilled cast iron. Metal Science and Heat Treatment, 56 (2014) 89 - 92. [7] Bartkowska A., Swadźba R., Popławski M., Bartkowski D.,Microstructure, microhardness, phase

):178-182. Virca, I. „Experimental studies on roughness and microhardness determination of some sintered parts, superficially treated with the optical radiation impulse“. Revista Academiei Forţelor Terestre, vol XV, nr. 4 (60), (Sibiu, 2010): 495-502. Virca, I. „The study of process sizes determining the durification of the sintered pieces with pulsed optiques radiations“, Revista de tehnologii neconvenţionale nr. 1, (Timişoara, 2004): 83-84. Virca, I. “The analyze of the final measures characterizing the durification process of the sintered pieces with pulsed optiques

., Jończyk. S., Szczepański A.: Automatic stand for NDT inspection using eddy current method. [in Polish]. Inżynieria Powierzchni 1 (2014), 57-62. 5. Babul T., Jończyk S., Samborski T., Włodarczyk S.: Detection of local inhomogeneity of the material and microstructure changes using eddy current method. [in Polish]. Przegląd Spawalnictwa 12 (2013), 25-28. 6. Babul T., Jończyk S., Samborski T.: Assessment of local defects in the microstructure - correlation measurements of eddy current and microhardness methods. [in Polish]. Przegląd Spawalnictwa 3 (2014), 11-17. 7. Dybiec M

. Laeknabladid. 2002;88:569-572. 24. Bamise CT, Ogunbodede EO, Olusile AO, Esan TA. Erosive potential of soft drinks in Nigeria. World J Med Sci, 2007; 2 (2):115-9. 25. West NX, Hughes JA, Addy M. The effect of pH on the erosion of dentine and enamel by dietary acids in vitro. J Oral Rehabil, 2001;28:860-864. 26. Attin T, Koidl U, Buchalla W, Schaller HG, Kielbassa AM, Hellwig E. Correlation of microhardness and wear in differently eroded bovine dental enamel. Arch Oral Biol, 1997;42:243-250. 27. International Organization for Standardization. ISO 750: 1998. Fruit and

Abstract

The aim of the study was to compare microhardness and wear resistance of ceramic-polymer composites with micro and nano-hybrid structure. For the studies commercial composites were used, containing filler particles of the same type but different sizes, nano-sized (Filtek Ultimate) and micro-sized (Filtek Z250) composites. Tribological testing was conducted using ball-on-disc micro-tribometer. Vickers testing method was applied for microhardness studies with the use of Futertech FM 700 device. It has been demonstrated that the wear of Filtek Ultimate is almost twice lower in comparison to wear of Filtek Z250 composite. It has been concluded that the use of filler nanoparticles significantly increased wear resistance of the material. Additionally, lack of correlation between material microhardness and wear resistance has been demonstrated.

Abstract

The article presents the impact of welding imperfections on the strength and microhardness of AW 5754 aluminium alloy welded joints executed with the TIG method. It presents the results of tomographic tests of welds. The results of strength and microhardness tests involving welds executed under various welding process parameters were shown. The impact of welding imperfections on the strength and microhardness of a welded joint was analysed. Based on analysing the relations between the r Pearson coefficient values and multiple correlation, significant relationships between strength, hardness and weld defects were evidenced. Furthermore, a very strong relation between the welding process parameters, welding imperfections, and weld strength and microhardness was shown.

Abstract

The article presents a method for optimizing technological parameters utilizing the G. Taguchi procedure. Optimization algorithm of controlled variables was presented in order to obtain the greatest value of nanohardness, microhardness and elastic modulus.

Abstract

A novel nonlinear optical crystal of potassium-boro-phthalate (KBP) was grown by a slow solvent evaporation technique. The crystalline nature and cell parameters were analyzed using X-ray diffraction (XRD) study. The presence of various functional groups was determined by Fourier transform infrared spectroscopy (FT-IR) spectral analysis. The linear optical properties were determined by UV-Vis-NIR spectral analysis. The dielectric constant and dielectric loss of KBP were measured in the frequency range of 500 Hz to 5 MHz at different temperatures. The mechanical properties of KBP single crystal were studied using Vickers microhardness tester. The linear and nonlinear optical properties of the grown crystals were studied to assess its suitability for device fabrication.