Name: JULIANA PRATES SOUZA
Publication date: 11/11/2024
Examining board:
Name |
Role |
|---|---|
| ADONIAS RIBEIRO FRANCO JÚNIOR | Examinador Externo |
| ANTONIO CESAR BOZZI | Presidente |
| MARCOS TADEU D AZEREDO ORLANDO | Examinador Interno |
Summary: There is an increasing demand in the industry for alloys with increasingly enhanced mechanical properties. Aiming at high-temperature applications, the Nb-Ni-WC-Cu alloy was developed in a previous study by spark plasma sintering (SPS) in three different nickel compositions (5%, 10%, and 15%) and sintered at three distinct
temperatures (1000°C, 1100°C, and 1200°C). The objective of this work was to investigate the micro-abrasive wear behavior of this alloy. For this, Vickers hardness tests and micro-abrasion tests were carried out using three abrasives: alumina (AlO), silicon carbide (SiC), and silica (SiO). The results indicated that increasing the
sintering temperature led to an increase in the hardness of the samples. The composition with 10% nickel sintered at 1100°C (M2 1100) showed the highest hardness (1345.80 HV). The micro-abrasion test was conducted in a fixed-ball configuration, with a load of 0.3 N and a rotation speed of 20 rpm, using an abrasive suspension with a concentration of 0.1 g/cm³ for AlO and SiC, and 0.35 g/cm³ for SiO. The best results regarding abrasive wear were obtained for the samples sintered at 1100°C, for all compositions. Through scanning electron microscopy (SEM), it was observed that the predominant wear mechanism was grooving for the AlO and SiO abrasives, and rolling and mixed mechanisms for the SiC abrasive.
Keywords: Niobium Alloys; Spark Plasma Sintering; Micro-abrasion;Wear Mechanisms
