Abstract
Test specimens with nominal compositions MoSi2, (Mo0.9Ti0.1)Si2, (Mo0.8Ti0.2)Si2, (Mo0.7Ti0.3)Si2, (Mo0.6Ti0.4)Si2, (Mo0.5Ti0.5)Si2 and (Mo0.4Ti0.6)Si2 were prepared by combustion synthesis. The combustion mode, propagation velocity of combustion wave, combustion temperature and product structure were investigated. Specimens MoSi2, (Mo0.9Ti0.1)Si2, (Mo0.8Ti0.2)Si2, (Mo0.7Ti0.3)Si2, underwent spontaneously self−propagating combustion synthesis. However, the (Mo0.6Ti0.4)Si2 and (Mo0.5Ti0.5)Si2 specimens required a sustainable energy supply to complete the combustion synthesis reaction. There was no combustion synthesis reaction in specimen (Mo0.4Ti0.6)Si2. The combustion wave propagated along a spiral trajectory from top to the bottom of the specimen compacts in a layer by layer mode. The propagation velocity of the combustion wave reduced with the addition of titanium. The X-ray diffraction analysis showed that the Cllb-MoSi2 and C40-(Mo,Ti)Si2 type phases were formed during combustion synthesis. The intensity of diffraction peaks of C40-(Mo,Ti)Si2 phase increased with Ti content.
Highlights
Molybdenum disilicide is a cheap, non−toxic and environmentally benign intermetallic
We have investigated the effect of the alloying of Ti on the combustion synthesis of MoSi2
This study presents an experimental investigation on the combustion synthesis characteristics of MoSi2, (Mo0.9Ti0.1) Si2, (Mo0.8Ti0.2)Si2, (Mo0.7Ti0.3)Si2, (Mo0.6Ti0.4)Si2, (Mo0.5Ti0.5) Si2 and (Mo0.4Ti0.6)Si2 powder compacts
Summary
Molybdenum disilicide is a cheap, non−toxic and environmentally benign intermetallic It is regarded as a competitive high temperature structural material owing to its high melting point of 2303K, excellent oxidation resistance up to 1873K, moderate density of 6.24g·cm−3, low thermal expansion coefficient of 8.1×10−6 K−1, good thermal and electrical conductivities of 50 W·m−1·K−1 and 21.5×10−6 Ω·cm, respectively[1,2,3,4,5]. The room temperature fracture toughness and high temperature strength of MoSi2 can be improved by alloying and composite approaches[1,2,3,4,7,8]. The combustion synthesis characteristics of the alloys with the nominal composition of MoSi2, Mo(Si0.9Ti0.1)[2], Mo(Si0.8Ti0.2)[2], Mo(Si0.7Ti0.3)[2], Mo(Si0.6Ti0.4)[2], Mo(Si0.5Ti0.5)[2], Mo(Si0.4Ti0.6)[2] are reported. The combustion mode, propagation velocity of combustion wave, combustion temperature and product structure will be discussed
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