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Gamma-alumina nanofibers of 7nm in diameter and aspect ratio ∼10 6 were doped with 10% of zirconia or alpha-alumina by in situ chemical liquid deposition (CLD) technique. Thermal behavior and decomposition kinetics of dopant nano-layers were conducted using simultaneous coupled thermal analysis (TG-DSC-FTIR) to optimize the processing conditions and suggest possible reaction mechanisms. SEM...
In this work, the microstructural features and mechanical properties of Co-free hardmetals doped by 3mol% yttria stabilized tetragonal zirconia and densified by means of conventional vacuum pressureless sintering as well as spark plasma sintering were studied. Influence of dispersed zirconia clusters on mechanical behavior and erosive and abrasive wear resistance of hardmetals with 6wt% of stabilized...
The aim of the current study was to investigate the effect of oxidation on abrasive wear behaviour of TiC based cermets at temperatures ranging from 20 to 900°C. Three types of material performance maps were constructed: oxidation rate maps, wear rate maps and maps showing the effect of oxidation on abrasion. Discussion on the performance of different cermet grades is supported by the SEM images combined...
The main aim of the present theoretical work is to determine numerical dependence between the geometrical parameter of maximum area of structural defect areamax (proposed by Y. Murakami, 1983) and surface fatigue of cemented carbides. The proposed relations allow making predictions of surface fatigue properties of cemented carbides (WC-Co hardmetals—with 10wt% Co and 15wt% Co binder; TiC-based cermets—with...
This work focuses on the abrasive wear performance of some carbide composites, WC-hardmetals and TiC-base cermets (in particular, composites prospective for metalforming). Wear tests were performed using the dry rubber-rimmed rotary wheel machine (modified ASTM G 65-94 method). The results were compared with those, obtained in ordinary erosion tests related to the mechanical properties and the structure...
The erosive wear resistance of cermets with different composition, structure and properties has been investigated. It has been shown that cermets erosive wear resistance cannot be estimated only by hardness, characterised by resistance to penetration. The differences in wear resistance between cermet materials with equal hardness level can be attributed to differences in their resistance to fracture...
TiC-base cermets are in advantage compared with WC-base hardmetals because of their lower friction coefficient and higher oxidation resistance. At the same time, the diversity of alloys based on TiC, wear and loading conditions contributes substantially to problems in material selection. Present research focuses on testing of TiC-based cermets of different composition in different wear conditions...
The influence of the structure of hardmetals of two classes, tungsten carbide-base cobalt bonded and titanium carbide-base steel bonded, in two different wear conditions, erosive and adhesive wear, has been investigated. It has been shown that the wear resistance is much more structure sensitive than any single mechanical property. The structure sensitivity of adhesive wear is much higher than that...
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