The equilibrium distribution coefficients of 12 impurities （As,Fe,Ca,Co,Al,Cr,Cu,Mg,Mn,Ni,Pb,Zn） in phosphorus were obtained by measuring their effective distribution coefficients at zone travel rate of 3,5,10,15,an...The equilibrium distribution coefficients of 12 impurities （As,Fe,Ca,Co,Al,Cr,Cu,Mg,Mn,Ni,Pb,Zn） in phosphorus were obtained by measuring their effective distribution coefficients at zone travel rate of 3,5,10,15,and 20 mm·h-1 in the purification process with vertical zone-melting technique.The results indicate that the method is reliable.The equilibrium distribution coefficients are below 0.3 except arsenic.展开更多
Laser melting deposition was carried out to deposit a 1Cr12Ni2WMoVNb steel bar on a wrought bar of same material. Room-temperature tensile properties of the hybrid fabricated 1Cr12Ni2WMoVNb steel sample were evaluated...Laser melting deposition was carried out to deposit a 1Cr12Ni2WMoVNb steel bar on a wrought bar of same material. Room-temperature tensile properties of the hybrid fabricated 1Cr12Ni2WMoVNb steel sample were evaluated, and microstructure, fracture surface morphology, and hardness profile were analyzed by an optical microscope （OM）, a scanning electron microscope （SEM）, and a hardness tester. Results show that the hybrid fabricated 1Cr12Ni2WMoVNb steel sample consists of laser deposited zone, wrought substrate zone, and heat affected zone （HAZ） of the wrought substrate. The laser deposited zone has coarse columnar prior austenite grains and fine well-aligned dendritic structure, while the HAZ of the wrought substrate has equiaxed prior austenite grains which are notably finer than those in the wrought substrate zone. Besides, austenitic transformation mechanism of the HAZ of the wrought substrate is different from that of the laser deposited zone during the reheating period of the laser deposition, which determines the different prior austenite grain morphologies of the two zones. Microhardness values of both the laser deposited zone and the HAZ of the wrought substrate are higher than that of the wrought substrate zone. Tensile properties of the hybrid fabricated 1Cr12Ni2WMoVNb steel sample are comparable to those of the wrought bar, and fracture occurs in the wrought substrate zone during the tensile test.展开更多
通过研究组分、掺杂和晶体生长条件对材料温差电性能的影响,采用熔炼—区熔法研制出较均匀的高性能赝三元 p 型温差电材料 Te:(Sb_2Te_3)_0.75(1-x)(Bi_2Te_3)_(0.25(1-x))(Sb_2Se_3)(?)生长出的晶锭的85%的部分,温差电优值 z=2.9～3.3&...通过研究组分、掺杂和晶体生长条件对材料温差电性能的影响,采用熔炼—区熔法研制出较均匀的高性能赝三元 p 型温差电材料 Te:(Sb_2Te_3)_0.75(1-x)(Bi_2Te_3)_(0.25(1-x))(Sb_2Se_3)(?)生长出的晶锭的85%的部分,温差电优值 z=2.9～3.3×10^(-3)/K。其性能高于目前国内的赝二元材料,达到了国外的较高水平,用这种材料制作的温差电致冷器件获得了很好的致冷效果。展开更多
基金Supported by the Eleventh Five-year National Key Technology Research and Development Program of China (2007BAE58B01)
文摘The equilibrium distribution coefficients of 12 impurities （As,Fe,Ca,Co,Al,Cr,Cu,Mg,Mn,Ni,Pb,Zn） in phosphorus were obtained by measuring their effective distribution coefficients at zone travel rate of 3,5,10,15,and 20 mm·h-1 in the purification process with vertical zone-melting technique.The results indicate that the method is reliable.The equilibrium distribution coefficients are below 0.3 except arsenic.
基金financial supports from the Cheung Kong Scholars and Innovative Research Team Program of Ministry of Education (No. IRT0805)the National Basic Research Program of China (No. 2010CB731705)
文摘Laser melting deposition was carried out to deposit a 1Cr12Ni2WMoVNb steel bar on a wrought bar of same material. Room-temperature tensile properties of the hybrid fabricated 1Cr12Ni2WMoVNb steel sample were evaluated, and microstructure, fracture surface morphology, and hardness profile were analyzed by an optical microscope （OM）, a scanning electron microscope （SEM）, and a hardness tester. Results show that the hybrid fabricated 1Cr12Ni2WMoVNb steel sample consists of laser deposited zone, wrought substrate zone, and heat affected zone （HAZ） of the wrought substrate. The laser deposited zone has coarse columnar prior austenite grains and fine well-aligned dendritic structure, while the HAZ of the wrought substrate has equiaxed prior austenite grains which are notably finer than those in the wrought substrate zone. Besides, austenitic transformation mechanism of the HAZ of the wrought substrate is different from that of the laser deposited zone during the reheating period of the laser deposition, which determines the different prior austenite grain morphologies of the two zones. Microhardness values of both the laser deposited zone and the HAZ of the wrought substrate are higher than that of the wrought substrate zone. Tensile properties of the hybrid fabricated 1Cr12Ni2WMoVNb steel sample are comparable to those of the wrought bar, and fracture occurs in the wrought substrate zone during the tensile test.
文摘通过研究组分、掺杂和晶体生长条件对材料温差电性能的影响,采用熔炼—区熔法研制出较均匀的高性能赝三元 p 型温差电材料 Te:(Sb_2Te_3)_0.75(1-x)(Bi_2Te_3)_(0.25(1-x))(Sb_2Se_3)(?)生长出的晶锭的85%的部分,温差电优值 z=2.9～3.3×10^(-3)/K。其性能高于目前国内的赝二元材料,达到了国外的较高水平,用这种材料制作的温差电致冷器件获得了很好的致冷效果。
