Advanced Methods for Consolidation of Powder Materials by Impulse Electromagnetic Fields
Advanced technologies for the production of new materials and,in particular,nanostructured materials,using powder technologies require fundamentally new approaches for the formation and preservation of a given structural-phase state.Precision control of the state of materials in the process of consolidating powders of nanomaterials can be carried out using pulsed electromagnetic fields.The aim of the project is to study the effect of high-voltage and low-voltage pulsed electromagnetic fields in the technologies of powder consolidation.The experimental devices of spark-plasma sintering,flash-sintering,high-voltage consolidation and magnetic-pulse compaction are used in our laboratory for the production of advanced materials from metal powders,ceramic and composite powders.We can produce boron carbide,silicon carbide,uranium nitride,tungsten carbide-cobalt-diamond composites,tungsten heavy alloys,and others by electromagnetic methods of powder consolidation.Investigations into the welding of titanium and stainless steel have shown that application of a short high-voltage electric current pulse and pressure produces stronger welded joints composed of both similar and different metals of considerably different thickness.A combination of a short electric pulse with simultaneous high speed application of mechanical pressure in the weld zone causes high-speed deformation of the contact zone.The process of joint formation itself does not cause any appreciable diffusion during welding.Electric exploding of a tungsten carbide – cobalt material near-by high-speed steel surface forms on it a hardening coating.The essential structure properties of the formed coatings are determined by specifications of contact exploding electrode and the pulse current amplitude and duration.The hardening layers of tungsten carbide and pure nanocrystalline tungsten have been formed upon the surface of high-speed steel as a result of electric exploding.Experimental results to consolidation metal powders,ceramic and composites powders by electromagnetic methods presage fruitful results.
spark-plasma sintering flash-sintering high-voltage consolidation magnetic-pulse compaction
Grigoryev Evgeny
Merzhanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences ISMAN,Academician Osipyan str.,8,Chernogolovka,Moscow Region,142432,Russia
国际会议
北京
英文
496-501
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）