Experimentation Investigation of Hard facing Layer by MMAW on Alloy Steel

The wearing of metal parts might be defined as a gradual decay or breakdown of the metal. When a part becomes so deformed that it cannot perform adequately, it must be replaced or rebuilt. While the end results of wear are similar, the causes of wear are different. It is essential to understand the wear factors involved before making a hard surfacing product selection. It would be easy to select a surfacing alloy if all metal components were subjected to only one type of wear. However, a metal part is usually worn by combinations of two or more types of wear. This makes an alloy selection considerably more complicated. A hard surfacing alloy should be chosen as a compromise between each wear factor. The initial focus should centre on the primary wear factor and then the secondary wear factor(s) should be examined. For example: upon examining a worn metal part, it is determined that the primary wear factor is abrasion and the secondary wear factor is light impact. The surfacing alloy chosen should have very good abrasion resistance but also have a fair amount of impact resistance. Keywords: Welding, Hard Facing Electrodes, Alloys, Afrox 300.

Process Simulation and Abrasion Behavior of Jet Electrodeposited Ni–TiN Nanocoatings

In this work, we study jet-electrodeposited Ni–TiN composite nanocoatings (CNCs) for improving abrasion resistance as a function of various nozzle diameters. In addition, COMSOL software is utilized to simulate the process of jet electrodeposition, particularly the influence of spraying speed and pressure of the electrolyte on the abrasion resistance of coatings. Optimization of the nozzle diameter to obtain uniform and high-performance coatings showed that a Φ7 mm nozzle diameter generated the optimum spraying speed and spraying pressure, which results in good micro-hardness and abrasion resistance of the Ni–TiN CNCs. Under these conditions, the 45 steel substrates are coated with a compact layer of uniform and nano-sized TiN particles, which are responsible for the high abrasion resistance of our Ni–TiN CNCs. Our study may motivate researchers to study jet electrodeposition in order to obtain abrasion-resistant coatings.

Effect of the Treatments of the Surface on Mechanical Performance of Concrete Containing Chemical Admixtures

The aim of this paper is to investigate two different concrete mixes, one with Limestone Powder (LSP) and the other with Ground Granulated Blast-Furnace Slag (GGBS), both mixes containing superplasticizer, in order to analyse their compressive strengths at 7 and 28 days, their abrasion resistance and slip resistance. The two mixes are treated with two different surface protection finishers, applied on the surface after the concrete has cured and analysis of how these finishers affect the abrasion resistance and slip resistance of the concrete is discussed.

Evaluation of the mechanical resistance of rheophores of the means of initiation for explosive’s materials, on the basis of the resistance to abrasion determined with the OPVA 10 specialized equipment

The scientific paper presents the synthesis of research results undertaken to develop the technical and methodological infrastructure for assessing the safety of means of initiating explosives, on the abrasion resistance of rheophores of electric detonators, in order to increase the safety of their use. The state-of-the-art OPVA 10 equipment is used to test the ability of rheophores insulation to withstand the abrasion forces that may occur during normal use. This equipment with a programmable automatic ensures the testing of the rheophores of the electric detonating staples to determine the abrasion resistance under the operating conditions provided by the harmonized European standard EN 13763-4 and the technical specification of the manufacturer, the operating temperature of this equipment being between 10 ÷ 30 °C ensuring at the highest level the fulfillment of the technical requirements imposed by the European and international regulations in the field.

Performance of Cleanroom Garment Fabrics When Processed in an Industrial Laundry, Comparing Irradiation and Autoclave Sterilisation

EU GMP Annex 1 requires that “reusable garments should be replaced based at a set frequency determined by qualification, or if damage is identified.” [1] In the UK, most cleanroom garments supplied to the pharmaceutical and healthcare sectors are washed and sterilised by gamma irradiation. This study compares cleanroom garment fabric performance across the lifespan of multiple fabrics. Previous research has shown that cleanroom garment fabrics terminally sterilised by gamma irradiation remain suitable for use for up to 50 processes, however, these studies often focus on a limited number of samples. This study uses a large sample set, analysing the performance up to 100 processes and compares the performance effects of gamma irradiation vs autoclaving, as an alternative sterilisation method. Multiple market leading cleanroom garment fabrics were washed and dried using a standard industrial cleanroom laundry process and sterilised by either gamma irradiation or autoclave. They were tested for particle barrier efficiency, abrasion resistance, pore size, and tensile strength as new, then at set process counts throughout their life, 10, 20, 30, 50, 70 and 100 processes. A process is equal to one wash/dry/sterilisation cycle. The results show that not all cleanroom garment fabrics deteriorate equally and that some market leading fabrics may not provide adequate performance throughout life, even if they are suitable when new. They also show that autoclaving is comparable with irradiation in durability and performance over a fabric’s life, in some cases performing better than irradiation above process counts of 50.

PERFORMANCE CHARACTERISTICS OF PAINT AND VARNISH MATERIALS FOR MARKING ROADS BASED ON LOCAL RAW MATERIALS

The aim of this work is to develop the technology of obtaining high-performance paintwork materials for road markings on the basis of local raw materials. The existing paint and varnish materials (paintwork materials) for road markings have been studied. Samples of paint and varnish materials for use as road markings were obtained under laboratory conditions. Laboratory and operational tests were conducted to determine the main quality indicators of the paint and varnish materials. As a result of monitoring the condition of road markings for two months it was found that the alkyd-based paintwork material retains its properties (color, adhesion, abrasion resistance) during the observed period and can be recommended as a coating for road markings.