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Online since: March 2023
Authors: Chen Kai Zhong
Studies have been carried out to improve the catalytic activity of graphene by reducing the oxygen content of graphene, grinding or heat treatment, adjusting the structure and surface properties of graphene.[39-42] At the same time, the change of the oxidation degree of graphene can also strengthen its catalytic activity, such as the preparation of reduced graphene oxide (RGO) and graphene oxide (GO).
[25] Tan CW, Tan KH, Ong YT, Mohamed AR, Zein SHS and Tan SH 2012 Environmental Chemistry Letters, 10(3) 265-73
[25] Tan CW, Tan KH, Ong YT, Mohamed AR, Zein SHS and Tan SH 2012 Environmental Chemistry Letters, 10(3) 265-73
Online since: June 2008
Authors: Pierre Fauchais, Ghislain Montavon
Other composites are also sprayed such as
MoB/CoCr [159] against erosion by molten Al-Zn alloy, Ni-Ti-C [160] which by SHS reaction
contain after spraying TiC, in a Ni rich solution plus NiTi, TiO2 and NiTiO3 and at last silicon
nitride based coatings [156] where the silicon nitride is imbedded in a complex oxide binder matrix.
At last, as with flame or gaseous fuel, HVOF SHS reactions can be produced upon spraying for example with SiO2/Ni/Al-Si-Mg powder resulting in composite materials of MgAl2O4, Mg2Si in AlSi matrix [182].
Cu base coatings containing large ceramic (Al2O3 and SiC particle larger than 150 µm) gave high abrasiveness for grinding stones and concrete [194].
At last, as with flame or gaseous fuel, HVOF SHS reactions can be produced upon spraying for example with SiO2/Ni/Al-Si-Mg powder resulting in composite materials of MgAl2O4, Mg2Si in AlSi matrix [182].
Cu base coatings containing large ceramic (Al2O3 and SiC particle larger than 150 µm) gave high abrasiveness for grinding stones and concrete [194].
Online since: May 2013
Authors: F.M.M. Pereira, A.S.B. Sombra
Self-Propagating High Temperature Synthesis (SHS) Technique
1.1.9.
Phases % Mass % Molar Rp (%) Rwp (%) SGOF DDW(%) BFO-100 100 100 13,73 17,77 1,09 1,07 BFO90 99,22 94,14 13,66 18,83 1,12 1,33 a-Fe2O3 0,78 5,88 BFO75 99,99 99,97 13,54 18,73 1,14 1,24 a-Fe2O3 0,01 0,03 BFO60 99,35 96,92 13,14 18,44 1,15 1,29 a-Fe2O3 0,65 3,08 BFO45 99,54 94,44 13,31 18,02 1,13 1,17 a-Fe2O3 0,46 5,56 BFO30 96,16 81,93 14,39 19,63 1,12 1,47 a-Fe2O3 3,84 18,07 BFO15 97,53 87,35 14,36 19,32 1,13 1,40 a-Fe2O3 2,47 12,65 SFO100 98,58 93,28 13,73 18,34 1,15 1,07 a-Fe2O3 1,42 6,72 According to Naiden et al. [56] this process not only finely dispersed dust as it can produce nanoscale sizes, after long time of grinding, but the synthesis of the compounds occurs by chemical reaction with activation energy too small due to the small particle size and energy of the milling process.
With 5% wt. carbon the propagation was unstable, and the front extinguished after 5 mm, but with 6.5–30 % wt. the propagation was stable throughout the reactants, with maximum temperatures of 900–1200 °C. 1.1.8 Self-Propagating High Temperature Synthesis (SHS) Technique.
Phases % Mass % Molar Rp (%) Rwp (%) SGOF DDW(%) BFO-100 100 100 13,73 17,77 1,09 1,07 BFO90 99,22 94,14 13,66 18,83 1,12 1,33 a-Fe2O3 0,78 5,88 BFO75 99,99 99,97 13,54 18,73 1,14 1,24 a-Fe2O3 0,01 0,03 BFO60 99,35 96,92 13,14 18,44 1,15 1,29 a-Fe2O3 0,65 3,08 BFO45 99,54 94,44 13,31 18,02 1,13 1,17 a-Fe2O3 0,46 5,56 BFO30 96,16 81,93 14,39 19,63 1,12 1,47 a-Fe2O3 3,84 18,07 BFO15 97,53 87,35 14,36 19,32 1,13 1,40 a-Fe2O3 2,47 12,65 SFO100 98,58 93,28 13,73 18,34 1,15 1,07 a-Fe2O3 1,42 6,72 According to Naiden et al. [56] this process not only finely dispersed dust as it can produce nanoscale sizes, after long time of grinding, but the synthesis of the compounds occurs by chemical reaction with activation energy too small due to the small particle size and energy of the milling process.
With 5% wt. carbon the propagation was unstable, and the front extinguished after 5 mm, but with 6.5–30 % wt. the propagation was stable throughout the reactants, with maximum temperatures of 900–1200 °C. 1.1.8 Self-Propagating High Temperature Synthesis (SHS) Technique.
Online since: November 2012
Authors: Viktors Mironovs, Andrej Shishkin, Dmitry Goljandin, Vijacheslav Lapkovsky
A waste of composite material (CM), containing boron-tungsten fibre and aluminium matrix (CM Al-W-B) is investigated. A method of grinding has been used for processing of Al-W-B CM waste. This method has been carried out in several stages in order to obtain a powder with determined particle size. The milled material contains aluminium matrix alloy, boron and tungsten. The morphology of CM Al-W-B particles is described. The mechanism of disintegration and relationship between energy spent for disintegration, and a degree of milling of CM Al-W-B powder, are described. Possible applications of Al-W-B composite powder as a source material for obtaining a new composite ceramics by self-propagating high-temperature synthesis (SHS) are noted.