Shock activation of green mixtures for SHS production
of Si–CSi–C composites
Sergey Skiba, Gh. G. PakSergey Skiba, Gh. G. Pak
XII International symposium on explosive production of new materials: science, technology, business and innovations
(EPNM-2014)
Cracow 2014
Si + C = SiC+Q
System Q, кДж/кg Tad, К,
Ti + B 2770 25005Ti + 3Si 1790 2350
Ti + C 2990 3070Tа + C 670 2550Si + C 73 1800
Methods of increase reactionary ability of Si-C system
SHS in additional electric field
SHS systems Si-C in the environment of nitrogen
Chemical activation of SHS process
Mechanical activation of initial mix
SHS with preliminary heating of a reactionary layer
Heat and combustion temperature for some SHS sytems
Increase of reaction ability
1 –electrical detonator; 2 – charge of ES; 3 – plate-piston; 4 – activated powder; 5 – container of conservation; 6 – plate-basic; 7 - ground; 8 –elements for fixation weld gap.
Parameters 1 2 3 4
Тhickness of plates-foundation, мм 12
Height of ES, мм 60 60 65 65Height weld gap, мм 2 3
23
Detonation velosity, м/s
3600
Percussion velosityдарения, м/s
600 670 700 750
Share of the reflected wave, % 20
Progress of SHS process
- - + +
SShock-wave activationhock-wave activation
Before activation
Microstructure of Si-C powder
After activation
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XII International symposium on explosive production of new materials: science, technology, business and innovations
(EPNM-2014)
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