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Abstract
Metal matrix composites were prepared by hot pressing (HP) and spark plasma sintering (SPS) techniques. Ball-milled ironbase powders were consolidated to near full density by these methods at 900°C. The physical and mechanical properties of the resulting composites were investigated. The specimens were tested for resistance to both 3-body and 2-body abrasion. The composites obtained by HP method (at 900°C/35 MPa) had higher density, hardness and resistance to abrasion than those obtained by SPS method.
Highlights
In recent years, there has been an increase in demand for metal and diamond tools used to treat natural stones, concrete, asphalt and abrasive ceramic materials
Stress-induced pressures overlap with the stresses resulting from the sintering process itself, thanks to which mass transport mechanisms are intensified
In comparison with the isostatic hot pressing method, the demand for electricity in the spark plasma sintering (SPS) process is about 20÷30% lower, which is very important for economic reasons
Summary
Metal matrix composites were prepared by hot pressing (HP) and spark plasma sintering (SPS) techniques. The method commonly used for consolidation of matrix materials in sintered metal-diamond tools is hot pressing (HP), which involves the simultaneous operation of high temperature and pressure, which ensures obtaining almost immediately porousless work rings/segments. The treatment of pressing a mixture of diamond powders, metals constituting the matrix and lubricants is carried out at a pressure of 100÷200 MPa. If the density of the paraffins is insufficient, hot isostatic pressing (HIP) or in-filtration can be used. In the SPS process, high material heating rates of up to 1000°C/min can be used This allows sintering of nanocrystalline powders without the effect of grain growth [6–13]. The main aim of the work was to examine the influence of various sintering techniques on selected physical, mechanical and MECHANIK NR 10/2018 tribological properties of the matrix material, which is an alternative to the commonly used Co-20% WC sinters
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