Vapour-Deposited Materials

MekU-Fluorocarbon Based Energetic Materials, First Edition. Ernst-Christian Koch. 

Being an anisotropic material, Enerfoil shows a combustion rate strongly dependent on the respective geometrical configuration. 

The hazard data for Enerfoil , are given in Table 16.2. From this, it becomes obvious that these materials are actually less sensitive than the commonly produced granular Magnesium/Teflon/Viton (MTV) materials (see chapter 19). 

Al (Protective coating) Mg Vapour deposited PIPE film Mg Al 

An intended application, although never commercially realized, was in fire transfer lines referred to as Flashtrack [12]. In a particular example, three 45 tm thick PTFE tapes with a coarse 16 (Am thick Mg coating on both sides would be cut into 2 mm wide strips and were confined in a 4 mm inner diameter Viton tube. After heat shrinking of the tube, it was read for use. The loading density was 1 g pyrolant per meter. When the tube is ignited, the pyrolant deflagrates with a velocity of the order of 100 m s but leaves the tube intact 

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Appendix C Chemical Vapour Deposition Materials and Their Corresponding Precursors... 

C. Duty, D, Jean and W, J. Lackey, Laser Chemical Vapour Deposition Materials, Modelling, and Process Control, Inter. Mater. Rev., 46, 271-287 (2001). 

Mitsui Mining Smelting Co., Ltd. (MMS) is a general non-ferrous metal enterprise which originated its business from mining and smelting. At present, its spectrum of business activities covers not only the production of zinc, lead, copper and other materials but also it has extended its applications to the production of rolled copper products, synthetic chemical products, electric circuit materials (electrolytic copper foil), PVD (physical vapour deposition) materials, battery materials, ceramics, rare metals, rare earth and automotive components. 

For direct neutron imaging both IP-ND with inherently present neutron converter material (Gd oxide) or common IP in combination with Gd metal or vapour deposited... 

A situation which is frequently encountered in tire production of microelectronic devices is when vapour deposition must be made into a re-entrant cavity in an otherwise planar surface. Clearly, the gas velocity of the major transporting gas must be reduced in the gas phase entering the cavity, and transport down tire cavity will be mainly by diffusion. If the mainstream gas velocity is high, there exists the possibility of turbulent flow at tire mouth of tire cavity, but since this is rare in vapour deposition processes, the assumption that the gas widrin dre cavity is stagnant is a good approximation. The appropriate solution of dre diffusion equation for the steady-state transport of material tlrrough the stagnant layer in dre cavity is... 

This approach is an alternative to quantitative metallography and in the hands of a master gives even more accurate results than the rival method. A more recent development (Chen and Spaepen 1991) is the analysis of the isothermal curve when a material which may be properly amorphous or else nanocrystalline (e.g., a bismuth film vapour-deposited at low temperature) is annealed. The form of the isotherm allows one to distinguish nucleation and growth of a crystalline phase, from the growth of a preexisting nanocrystalline structure. 

The alkoxides and aryloxides, particularly of yttrium have excited recent interest. This is because of their potential use in the production of electronic and ceramic materials,in particular high temperature superconductors, by the deposition of pure oxides (metallo-organic chemical vapour deposition, MOCVD). They are moisture sensitive but mostly polymeric and involatile and so attempts have been made to inhibit polymerization and produce the required volatility by using bulky alkoxide ligands. M(OR)3, R = 2,6-di-terr-butyl-4-methylphenoxide, are indeed 3-coordinate (pyramidal) monomers but still not sufficiently volatile. More success has been achieved with fluorinated alkoxides, prepared by reacting the parent alcohols with the metal tris-(bis-trimethylsilylamides) ... 

Incorporation of nitrogen into the carbons prepared via chemical vapour deposition (CVD) or into the carbon nanotubes yields highly graphitised materials with excellent structure ordering. For example, ordered mesoporous carbons containing 7.0-8.8 wt,% N have been obtained by the CVD method, using the SBA-12, SBA-15, MCM-41, MCM-48, and HMS materials as matrices and acetonitrile as carbon precursor [1],... 

Applications involving ring transfer or loss. The kinetic lability, volatility, and Lewis acidity of heavy alkaline earth metallocenes have been the properties most important to their applications. The gas-phase decomposition of volatile metallocenes is useful in the preparation of thin films of alkaline earth-containing materials and in doping semiconductors. Reviews are available on the use of group 2 organometallic compounds as precursors for chemical-vapour deposition (CVD).2 3... 

Disordering on surfaces Layers on materials Vapour deposition, laser surface melting, ion beam modification... 

In a review by Gonsalves el al. (2000), techniques for the fabrication of nano-structured materials are outlined. Synthesis from corresponding organo-metal precursors of nano-structured metals (Fe, Co, Ni) and alloys (Fe-Co, Pt-Pd, and special steels) are discussed and various methods considered such as thermal decomposition, ultrasonic irradiation, chemical vapour deposition, laser pyrolysis and reduction. 

Mattevi, C., H. Kim, and M. Chhowalla, A review of chemical vapour deposition of graphene on copper. Journal of Materials Chemistry, 2011. 21(10). 

Chen, Z., et al., Three-dimensional flexible and conductive interconnected graphene networks grown by chemical vapour deposition. Nature Materials, 2011.10(6) p. 424-428. 

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