Abstract
This work deals with preparation of intermetallic alloy TiAl15Si15 (wt. %) by powder metallurgy using Spark Plasma Sintering method. Ti-Al-Si alloys are known as materials with low density, relatively good mechanical properties in comparison with their density and good oxidation and corrosion resistance at elevated temperatures. Preparation of intermetallics by melting metallurgy is very problematic. Powder metallurgy using reactive sintering followed by suitable compaction seems to be a promising method. In this work, TiAl15Si15 alloy was prepared by reactive sintering, milling and by unique ultra-high pressure Spark Plasma Sintering within the framework of international cooperation in Krakow. For the comparison it was also prepared by conventional Spark Plasma Sintering. The results show that higher pressure of sintering decreases the porosity of compact sample and increases mechanical properties, especially hardness.
Highlights
High Pressure Spark Plasma Sintering is a unique method for preparation of many materials of poor sinterability, for example ceramic composites, refractory materials or superhard materials based on boron nitride or polycrystalline diamond
3 Results and discussion TiAl15Si15 alloy was prepared by reactive sintering, milling and Spark Plasma Sintering
All TiAl15Si15 alloys are characterised by Ti5Si3 silicides in TiAl matrix
Summary
High Pressure Spark Plasma Sintering is a unique method for preparation of many materials of poor sinterability, for example ceramic composites, refractory materials or superhard materials based on boron nitride or polycrystalline diamond. It is possible to sinter materials based on intermetallic alloys [1,2,3]. A high pulsed direct current flows through the powder material, which activates the sintering reaction. Micro-spark discharges occur in the spaces between powder particles, and plasma is generated [6,7,8]. These discharges remove absorbed gases and oxide films on powder particles.
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