Table 4 - uploaded by Aleksandar Vencl
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The testing rig and appropriate testing procedure have been developed for the study of abrasive wear under normal vibration load of selected specimens. Specimens were made of spheroidal graphite cast iron microalloyed by various percent content of tin (Sn). Experimental results on the influence of the vibration velocity and Sn content upon wear hav...
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... results for wear parameters for each specimen at various vibration velocities are given in Table 4. Based on these results, appropriate diagrams are drawn for the dependences of wear rate on vertical vibration velocity w z (Fig. 3) and the dependences of wear rate on tin (Sn) percentage content in the spheroidal graphite cast iron (Fig. 4). ...
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... The tests were performed in the ambient air at room temperature. A schematic diagram of modified pin-on-drum tribometer is presented in figure 2 [4,6,7]. ...
The present paper considers wear of coatings deposited by HVOF (High velocity oxy-fuel) technology, under conditions of dry friction against abrasive surface accompanied with the action of vibrations perpendicular to the sliding axis. Results are obtained with four type coatings: two types with Ni matrix of composition 602P – without preliminary heating of the basic surface (the substrate) and after substrate heating up to 650°C in a chamber; coating WC-12Co with tungsten matrix and coating obtained by 1:1 proportion powder mixture of both compositions 602P and WC-12Co. Results about the thickness, hardness and coating' morphology are presented, as well as dependences of the wear and the relative wear resistance on vibration speeds in the interval 3.03 to 21.08 mm/s. New results are obtained about the nonlinear relationship between abrasive wear and vibration speed showing minimal wear for all specimens by 6.04 mm/s. It is found that lowest wear shows WC-12Co coating in the entire interval of vibration speed variation: 3.03 to 21.08 mm/s.
The obtained results are new in the literature; they are not presented and published by the authors.
... Numerous methods and technologies have been elaborated to promote the hardness of the surface layers and the coatings on them. Using this approach solved many issues, associated with prolonging the lifetime and promoting the reliability of the contact conjunctions in machines [13][14][15][16][17][18][19][20][21][22][23][24][25][26] . ...
The paper studies the ecological aspects of self-organisation effects in tribosystems, containing self-lubricating composite materials IPM 304 and IPM 305 in copper matrix in atmospheric medium at different normal loads. The measurements and expression of the self-organisation show low values of the coefficients of friction and wear of the contacting materials in the tribosystems. This effect is of great importance for the environmental protection because it leads to decrease of use of energy and material resources and also to decrease in the pollution of the environment with gaseous, liquid, solid components and heat from the internal combustion engines and the industrial machines. The self-organisation effects of the tribosystems are sensible towards the combinations of the contacting materials during friction - normal load, sliding rate, presence and properties of the lubrication material. It has been found out that the friction coefficient in tribosystems of self-lubricating composite materials: IPM 304 - Steel 45 and IPM 305 - Steel 45 decreases in a non-linear pattern and reached values which are typical for liquid friction - 0.05 and 0.08, respectively. These results are a proof that on micro level a self-organisation of the tribosystems occurs. For the tribo-system BrO1F1 - Steel 45 the dependence of the friction coefficient has the opposite dependence - its values increase to the range between 0.26 and 0.37 which are typical for dry friction.
The monograph “Advanced Tribological Coatings for Heavy-Duty Applications: Case Studies” reflects the last trend in solving wear problems. It presents a summary of the researches conducted by the authors in the past few years, concerning the tribological coatings designed for different heavy-duty applications under the impact loads and high temperatures and pressures, in abrasive, erosive and corrosive environment. Three different deposition techniques and various coating materials were used and discussed, i.e. electroless plating process for deposition of nickel composite coatings with different nanoparticles (diamond, SiC and BN) addition; gas metal arc welding (GMAW) technique for hardfacing of different ferrous-based coatings; and high velocity oxygen fuel (HVOF) spraying process for deposition of various superalloy coatings.
