Stepwise synthesis of a Zr–C–Si main chain polymer precursor for ZrC/SiC/C composite ceramics

Low valence state Cp2Zr(ii) was firstly obtained by a redox reaction of Cp2ZrCl2 with reductive Mg, which subsequently copolymerized with (CH3)2Si(CH2Cl)2 to form a Zr–C–Si main chain polymeric precursor of polyzirconosilane (PZCS).

Review on Manufacturing of Metal Foams

Metal foams possess excellent physical and mechanical properties. This paper reviews the common manufacturing process of metal foams. Various ways used to produce metal foams based on metal properties are described. The manufacturing process follows four primary routes: liquid state, solid state, ion or vapour processing. Liquid-state processing produces porosity to liquid or semi-liquid metals, and solid-state foaming produces metal foams with metal powder as starting material. For ion and vapour processing methods, metals are electro-deposited onto a polymer precursor. The polymer precursor is removed by chemical or heat treatment to produce metal foams. The advantages and limitations of each manufacturing process are also described.