According to the working environment of the polar glacier core drilling,a separatory funnel capillary viscometer which can be used for testing the viscosity of liquids under ultra-low temperature conditions was design...According to the working environment of the polar glacier core drilling,a separatory funnel capillary viscometer which can be used for testing the viscosity of liquids under ultra-low temperature conditions was designed. This viscometer has a simple structure and it is easy to operate,which can meet the testing requirements of different temperature conditions.The viscosity of the dimethyl silicone oil KF-96L-2.Ocs was measured under different temperatures using this designed viscometer,and it is found that the viscometer coefficient K changes linearly with temperature.This testing method has relatively high test accuracy and its relative error is less than 4%,which can be used to test the viscosity of the different liquids in ultra-low temperature conditions.展开更多
Fe-58at%Al alloy is undercooled up to 222 K (0.15TL) with the drop tube technique. It is found that there exists a critical undercooling about 185 K, beyond which a 揹endrite-equiaxed?growth morphology transition occu...Fe-58at%Al alloy is undercooled up to 222 K (0.15TL) with the drop tube technique. It is found that there exists a critical undercooling about 185 K, beyond which a 揹endrite-equiaxed?growth morphology transition occurs in FeAl intermetallic compound. This transition is character-ized by sharp decrease of its grain size. Once the undercool-ing exceeds 215 K, the peritectic transformation is sup-pressed completely and a fibrous structure is formed, which results from the cooperative growth of FeAl and FeAl2 com-pounds.展开更多
基金Supported Project of the Natural Science Foundations of China(No.41106158)
文摘According to the working environment of the polar glacier core drilling,a separatory funnel capillary viscometer which can be used for testing the viscosity of liquids under ultra-low temperature conditions was designed. This viscometer has a simple structure and it is easy to operate,which can meet the testing requirements of different temperature conditions.The viscosity of the dimethyl silicone oil KF-96L-2.Ocs was measured under different temperatures using this designed viscometer,and it is found that the viscometer coefficient K changes linearly with temperature.This testing method has relatively high test accuracy and its relative error is less than 4%,which can be used to test the viscosity of the different liquids in ultra-low temperature conditions.
文摘Fe-58at%Al alloy is undercooled up to 222 K (0.15TL) with the drop tube technique. It is found that there exists a critical undercooling about 185 K, beyond which a 揹endrite-equiaxed?growth morphology transition occurs in FeAl intermetallic compound. This transition is character-ized by sharp decrease of its grain size. Once the undercool-ing exceeds 215 K, the peritectic transformation is sup-pressed completely and a fibrous structure is formed, which results from the cooperative growth of FeAl and FeAl2 com-pounds.
