Yılmaz Küçük

Application of Taguchi Method to Study Abrasive Wear Behavior of Ceramic-Coated Specimens with Plasma Technique.

Different types of ceramic powders were coated on the surface of middle carbon steel using a plasma method. Coated surfaces were tested experimentally with regard to their abrasive wear resistance. To evaluate test data obtained, an experimental design method, which is based on the Taguchi method, was used. By using the Taguchi method, influence of test parameters, such as normal load, abrasive grit size, and material on wear resistance of coatings by calculating signal-to-noise (S/N) ratio and analysis of variance (ANOVA), could be estimated. From analysis of test results, it was determined that load factor has the most effect on wear of coating.

Microabrasion Wear Behavior of VC and CrC Coatings Deposited by Thermoreactive Diffusion Technique

Thermal reactive diffusion (TRD) coating on a DIN 1.2367 die steel substrate was performed in a powder mixture consisting of ferrovanadium, ferrochromium, ammonium chloride, alumina, and naphthalene at temperatures of 1000, 1050, and 1100°C for 2–4 h. The carbide layers were characterized using the microstructure, microhardness, X-ray diffraction, and chemical analysis. Wear scars were analyzed on scanning electron microscopy (SEM) micrographs with an energy-dispersive X-ray spectroscopy module. Depending on the coating process time and temperature, the thicknesses of the vanadium carbide and the chromium carbide layers formed on the substrate were obtained in a range from 7 to 30 μm and 5 to 17 μm, respectively. The maximum hardness values of vanadium carbide and chromium carbide layers were measured as 2537 and 1973 HV, respectively. The test samples coated using the TRD method were analyzed with regard to abrasive wear behavior using three different loads (1, 2, and 3 N) and speeds of 40, 80, and 160 rpm in fixed-ball micro-abrasion tests. Depending on the load and speed values applied, the grooving and rolling mechanisms were found to be predominant abrasion mechanisms on the worn surfaces.

Investigation of Abrasiveness Property of Blast Furnace Slag on Ceramic Coatings via the Abrasive Slurry Wear Method

In this study, the abrasiveness property of blast furnace slags emerging as a waste material in the production of crude iron was investigated. The abrasive slurry wear (ASW) method was used for experiments. For abrasiveness tests, oxides (Al2O3, Al2O3–13% TiO2, Al2O3–40%TiO2, Cr2O3), including ceramics, which were coated on the AISI 1040 medium carbon steel surface via the plasma spray-coating method, were used. The aim of this experimental investigation was to determine the effects of the same parameters, such as abrasive particle size, mud concentration, rotational speed, and sliding distance, on abrasiveness. The effects of the investigated parameters on abrasiveness are given in order of the most affected to the leastas rotational speed, coating materials, abrasive particle size, and sliding effects, respectively. Abrasion resistance was increased as a result of an increase in the hardness of coating for abraded material. According to sample scanning electron microscopy (SEM) micrographs, plastic defo...In this study, the abrasiveness property of blast furnace slags emerging as a waste material in the production of crude iron was investigated. The abrasive slurry wear (ASW) method was used for experiments. For abrasiveness tests, oxides (Al2O3, Al2O3–13% TiO2, Al2O3–40%TiO2, Cr2O3), including ceramics, which were coated on the AISI 1040 medium carbon steel surface via the plasma spray-coating method, were used. The aim of this experimental investigation was to determine the effects of the same parameters, such as abrasive particle size, mud concentration, rotational speed, and sliding distance, on abrasiveness. The effects of the investigated parameters on abrasiveness are given in order of the most affected to the leastas rotational speed, coating materials, abrasive particle size, and sliding effects, respectively. Abrasion resistance was increased as a result of an increase in the hardness of coating for abraded material. According to sample scanning electron microscopy (SEM) micrographs, plastic deformation and microcrack abrasion mechanisms were determined. It was determined that blast furnace slag has a characteristic that causes abrasion on ceramics coatings. In addition, it was observed that blast furnace slag has quite a high abrasion effect on substrates. The best wear resistance was observed in the coating of Cr2O3 and other magnitudes of wear resistance from high to low for coatings were determined as Al2O3, Al2O3–13% TiO2, and Al2O3–40%TiO2, respectively

Effect of the powder particle size on the wear behavior of boronized AISI 304 stainless steel

Abstract In this study, the AISI 304 steel specimens were boronized with nanoboron of the size of 10–50 nm and commercial Ekabor 3 powders (<1400 μm) at 950 °C to 1000 °C for 2 h and 4 h. Boronized steel specimens were characterized via SEM, microhardness and XRD analyses. Abrasive wear behavior of the specimens, boronized at different temperatures and treatment durations, were examined. The fixed ball micro-abrasion tests were carried out using the abrasive slurry, prepared with different SiC powder particle sizes on the boronized specimens at different rotational speeds. The specimens boronized with nanoboron powders exhibited a higher hardness and abrasive wear resistance than the samples boronized with the Ekabor 3 powders.