Papers by Keyword: TiSi₂

Abstract: TiSi2 (Titanium disilicide) has attracted great research interest due to its large silicon content, remarkably low electrical resistivity (about13–16μΩcm), good photocatalytic property, high temperature stability, and good corrosion resistance. It is an excellent electronic material and potential photocatalyst and high temperature structure material. In this work, TiSi2 was prepared by using the “chemical oven” enhanced self-propagating combustion method from the elemental powder compact. The mixture of Si and Ti (atomic ratio 3:5) were ignited as chemical oven. The composition of product was detected by XRD. Result shows the product is a single phase titanium disilicide with trace impurities. The maximum combustion temperature of Ti+2Si compact was up to 1472°C, which exceeds the lowest eutectic point (1330°C) of the Ti-Si binary mixture. Thus it can be predicted the formation of TiSi2 is primarily dominated by the solid-liquid mechanism, which includes dissolving solid reactants and precipitating silicide product. It could also be convinced by SEM photos of the combustion product and reacting zone of the compact.

Abstract: Titanium metal matrix composites were produced. The powder metallurgy route applied was a conventional route consisting of blending titanium matrix powder with different percentages of various titanium compounds, as reinforcement particles, followed by cold compaction in a uniaxial press with a floating matrix and a sintering process in a vacuum furnace. This work studied the different interactions between the titanium matrix and the various titanium compounds added. To evaluate these interactions microscopic techniques are used principally, optical and electronic microscopy, with EDX techniques. By microstructural analysis the reactivity between reinforcement and matrix particles was investigated, and any new phases that formed during the sintering process were evaluated. In addition, microhardness test were conducted to study the mechanical properties associated with the new phases, and to evaluate the relative strength or weakness of the interfacial zones.