• Kazior, Jan
• Sommitsch, Christof
• Hebda, Marek
• Buzolin, Ricardo Henrique
• Skałoń, Mateusz

Abstract

The following paper describes a new and eective method to obtain high-density sinters<br/>with simultaneously decreased distortions, produced by one press and sinter operation. This eect<br/>was achieved through the induced disappearance of the eutectic liquid phase. The study was carried<br/>out on AISI 316L stainless steel powder that was mixed with elemental boron and silicon nitride.<br/>Boron was used as a sintering process activator. The scientific novelty of this publication consists of<br/>the use of a silicon nitride as a solid-state nitrogen carrier that was intended to change the borides’<br/>morphology by binding boron. Based on the thermodynamic calculations, 20 blends of various<br/>compositions were tested for physical properties, porosity, microstructure, and mechanical properties.<br/>Moreover, phase compositions for selected samples were analyzed. It was shown that the addition<br/>of silicon nitride as a nitrogen carrier decreases the boron-based eutectic phase volume and both<br/>increases the mechanical properties and decreases after-sintering distortions. An explanation of the<br/>observed phenomena was also proposed.

Topics

• density
• morphology
• stainless steel
• Nitrogen
• nitride
• Silicon
• Boron
• porosity
• boride
• liquid phase
• sintering