H13 hot work tool steels are subject to high wear and surface deformation. For this reason, it is important to coat H13 steels and to protect the surface forms with lubricants that can be used in the working environment. This study aimed to increase the wear resistance of H13 hot work tool steel by boronizing and to use nano-silver-doped lubricants under working conditions. The boronizing process was carried out at 700, 800, and 900 °C for 2, 4, and 8 h in a nano-boron powder atmosphere. Wear tests were conducted under dry conditions and with nano-silver-doped colloidal suspension prepared with three different ligands. Analyses of the experimental results examined the parameters of friction coefficient, weight loss, microhardness and surface roughness. Ultra-violet (UV), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive x-ray (EDX) spectroscopy, x-ray diffraction (XRD) and 3D topography methods were used for visual and elemental analysis of the surfaces. According to the experimental results, an average coating thickness of 26.5 μm and hardness value of 2001 HV were obtained under conditions of 900 °C for 4 h. The nano-silver-doped colloidal suspension prepared with gelatin yielded 52% better friction coefficient, 88% better weight loss and 51.42% better surface roughness results than the dry wear conditions. It was determined that nano-silver-doped colloidal suspensions prepared with different ligands exhibited different characteristics in the wear environment.
Given the added need for eco-friendly material, environmental scientists are constantly on the look-out for new solutions. In this respect, biodegradable polymer proved to be a promising one. The Selfix material, being a bioplastic, is biodegradable and, unlike other plastic products, can be considered feasible for the industry as a smart material capable of biodegrading at the end of its life cycle. Using Selfix, waste paper can be re-used, thus eliminating the need for recycling and helping to reduce the CO 2 emissions. The present paper develops 3D models with Selfix material to offer benefits such as easy-cutting and sticking properties in a way that can be educational for children. We examine the mechanical properties of this material using tensile testing, laser-cutting, CNC milling, surface roughness and also scanning electron microscope or SEM.
In this study, it was investigated whether the load strength of bio plastic (PLA) specimens produced in a three-dimensional printer can be increased by applying the temperature and dwell time variables were applied, by performing 9 different experiments. ASTM D638 standard procedure is adopted for evaluating the tensile behaviour of 3D-printed PLA test specimens. It was examined whether there was a change in the material structure and interpretation was made according to the results. Experimental studies primarily started with the production of samples with a 3D printer. In the first three samples, the temperature was kept constant at 100 ℃, then the fourth, fifth and sixth samples were kept under 150°C, The last three samples were kept at 200°C, and the waiting times were adjusted to 25, 50, and 75 minutes, respectively, for samples. Test samples 7, 8 and 9 could not withstand the high temperature, so the tensile test could be performed up to the number 6 sample. In order to investigate the changes in the heat treated samples, the tensile test was applied to the untreated sample and the remaining 6 samples. After testing the samples, yield strength, tensile strength, maximum tensile and modulus of elasticity values were compared. As a result of the test, positive results were observed in yield strength when the untreated sample was compared with the heat treated samples, which shows that the heat treatment has a positive effect on the samples, and also the effect of heat treatment led to an increase elasticity modulus, As per the effect on the bio plastic surface according to the graphs, the specimen roughness was found to vary depending on the temperature because temperature affects in surface roughness. In our attempts, investigations will have performed by Optical microscope analysis, Surface Roughness Measurement, and tensile testing and this will help us to explain properties of the samples and changes likely to occur in the course of the experiments. The aim of this research is improve the mechanical properties of bio plastic by thermal treatment.
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