Solid phase synthesis and formation mechanism of SrB6powder are studied systematically i n this paper.X-ray diffraction and scanni ng electron microscopy analysis show that interaction in the SrCO3-B4C-C system intend...Solid phase synthesis and formation mechanism of SrB6powder are studied systematically i n this paper.X-ray diffraction and scanni ng electron microscopy analysis show that interaction in the SrCO3-B4C-C system intended to strontium hexaboride formation belongs to solid p hase processes and passes through the stages of transit ion phases Sr3B2O6,SrB2O4 formation etc.The optimal technolo gy of strontium hexaboride synthesis i s holding time of 2.5h at 1400℃under 10-2Pa vacuums.The shape of B4C powder decide that of SrB6.展开更多
The potential of powder metallurgy processing for the manufacture of Al?SrB6 composites was explored. Al4Sr particles fractured extensively during the ball milling of Al?15Sr/Al?4B powder mixtures. There was no intera...The potential of powder metallurgy processing for the manufacture of Al?SrB6 composites was explored. Al4Sr particles fractured extensively during the ball milling of Al?15Sr/Al?4B powder mixtures. There was no interaction between the Al4Sr and AlB2 compounds across the section of the aluminium grains in the as-milled state. SrB6 formed, when the ball milled powder blends were subsequently annealed at sufficiently high temperatures. Ball milling for 1 h was sufficient for SrB6 to become the major constituent in powder blends annealed at 700 °C while it took 2 h of ball milling for powder blends annealed at 600 °C. Higher annealing temperatures and longer ball milling time encouraged the formation of the SrB6 compound while the latter made a great impact on the microstructural features of the Al?SrB6 composite. The SrB6 compound particles were much smaller and more uniformly distributed across the aluminium matrix grains in powder grains ball milled for 2 h before the annealing treatments at 600 °C and 700 °C.展开更多
文摘Solid phase synthesis and formation mechanism of SrB6powder are studied systematically i n this paper.X-ray diffraction and scanni ng electron microscopy analysis show that interaction in the SrCO3-B4C-C system intended to strontium hexaboride formation belongs to solid p hase processes and passes through the stages of transit ion phases Sr3B2O6,SrB2O4 formation etc.The optimal technolo gy of strontium hexaboride synthesis i s holding time of 2.5h at 1400℃under 10-2Pa vacuums.The shape of B4C powder decide that of SrB6.
文摘The potential of powder metallurgy processing for the manufacture of Al?SrB6 composites was explored. Al4Sr particles fractured extensively during the ball milling of Al?15Sr/Al?4B powder mixtures. There was no interaction between the Al4Sr and AlB2 compounds across the section of the aluminium grains in the as-milled state. SrB6 formed, when the ball milled powder blends were subsequently annealed at sufficiently high temperatures. Ball milling for 1 h was sufficient for SrB6 to become the major constituent in powder blends annealed at 700 °C while it took 2 h of ball milling for powder blends annealed at 600 °C. Higher annealing temperatures and longer ball milling time encouraged the formation of the SrB6 compound while the latter made a great impact on the microstructural features of the Al?SrB6 composite. The SrB6 compound particles were much smaller and more uniformly distributed across the aluminium matrix grains in powder grains ball milled for 2 h before the annealing treatments at 600 °C and 700 °C.
