Article ID Journal Published Year Pages File Type
144198 Advanced Powder Technology 2013 8 Pages PDF
Abstract

Mo5SiB2 (T2) was synthesized by sparking plasma sintering (SPS) under different heating rates and sintering temperatures. The powder mixture with a T2 composition (Mo–12.5Si–25B (at.%)) failed to produce the T2 single-phase alloy due to the volatilization of Si during SPS process. Extra 0.5 at.% Si added to this mixture offset the volatilization loss. It has been found that heating of the mixture at low heating rates favored the formation of binary phases in the solid state at medium temperatures. In this work, the T2 alloy with a fine-grained microstructure was obtained via a liquid–solid reaction when the mixture was heated fleetly to the temperatures above the silicon melting point at the rapid heating rate of 200 °C/min. The sintering temperature at 1500 °C for T2 synthesis is beneficial to enhance further densification, as well as to avoid abnormal grain growth at higher temperatures.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► SPS is an effective method to synthesize T2 alloys. ► Extra 0.5 at% Si added to the powder mixture can offset volatilization loss of Si. ► Rapid heating rates suppress the appearance of second phases. ► The optimum sintering temperature for the production of T2 alloys is 1500 °C.

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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