Abstract
The aim of this study was to demonstrate the advantages and the method of application of the SHS process in the manufacture of (NiAl/Ni3Al)/TiB2 composites. A comparison was made between sinters manufactured by FAST/SPS using two different routes to process the substrates, which formed the composite matrix. The evaluation criteria were based on measurements of selected physical, mechanical, and tribological properties, and on microstructure examinations. The evaluation has indicated a preferable method for the manufacture of composites, where the SHS reaction takes place during compaction of the powder mixture. This produces a sinter characterized not only by the high degree of sintering, and high values of the Young’s modulus and HV1 hardness, but also by the satisfactory resistance to tribological wear. Additionally, the use of this process saves energy and reduces product-making cost, owing to a less expensive technique of making individual substrates.
Highlights
ALLOYS based on NiAl phases are perceived as interesting materials for applications in the energy, manufacturing, automotive, and aerospace industries
This study focuses on the self-propagating high-temperature synthesis (SHS) of composites based on the NiAl intermetallic matrix (IMCs)
Owing to the reduced temperature and time of the process, the use of R/spark plasma sintering (SPS) saves energy, which is reflected in the lower manufacturing cost and better environmental protection
Summary
ALLOYS based on NiAl phases are perceived as interesting materials for applications in the energy, manufacturing, automotive, and aerospace industries. This is related to their potentially high operating temperature, as they are characterized by high thermal stability, including good mechanical properties at high temperature, relatively low density, satisfactory corrosion resistance, and resistance to oxidation.[1,2,3,4]. The high-temperature mechanical properties can be further improved when NiAl-based composites with evenly spaced, very hard ceramic particles are produced, e.g., TiB2, ZrB2, Al2O3, CeO2, ZrO2, or TiC.[5,6,7,8,9,10,11,12] It has been found that the reinforcing particles significantly improve the NiAl compressive strength at both room and high temperature
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