In order to develop a new type of contact cable with high strengthand high electrical conductivity, Cu-Cr alloy series were selected asmaterials and cu-Cr alloy castings were produced by means ofdirectional solidifica...In order to develop a new type of contact cable with high strengthand high electrical conductivity, Cu-Cr alloy series were selected asmaterials and cu-Cr alloy castings were produced by means ofdirectional solidification continu- ous casting (DSCC) process. theresults show that the fibrillar strengthening phase, β-Cr, orderlyarranges among the copper matrix phase along the wire direction; andmicrostructure of in-situ composite forms, which retains the basicproperty of good conductivity of the copper matrix and meanwhileobtains the strengthening effect ofβ-Cr phase.展开更多
A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All t...A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All thereactions proceed smoothly and soluble polymers of high molecular weights(M_w up to 3.8×10~4)are obtained in high yields(up to 97%).展开更多
The development and application of domestic spinel and high-alumian/spinel(including corun-dum/spinel and calcined-bauxite/spinel) castables were disucssed in this paper,It expounded the tech-nical characters and virt...The development and application of domestic spinel and high-alumian/spinel(including corun-dum/spinel and calcined-bauxite/spinel) castables were disucssed in this paper,It expounded the tech-nical characters and virtues of high grade and medi-um grade spinel and the importance of the develop-met and successful application of calcined-bauxite/spinel castalbes.Because of the technical and eco-nomical feasibility,the developement and application of spinel and high-alumina/spinel castables,in which domestic refractory workers play an important role ,have been flurishing.展开更多
文摘In order to develop a new type of contact cable with high strengthand high electrical conductivity, Cu-Cr alloy series were selected asmaterials and cu-Cr alloy castings were produced by means ofdirectional solidification continu- ous casting (DSCC) process. theresults show that the fibrillar strengthening phase, β-Cr, orderlyarranges among the copper matrix phase along the wire direction; andmicrostructure of in-situ composite forms, which retains the basicproperty of good conductivity of the copper matrix and meanwhileobtains the strengthening effect ofβ-Cr phase.
基金This project was supported by the Research Grants Council of Hong Kong(Nos.603304,604903HKUST6085/02P).
文摘A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All thereactions proceed smoothly and soluble polymers of high molecular weights(M_w up to 3.8×10~4)are obtained in high yields(up to 97%).
文摘The development and application of domestic spinel and high-alumian/spinel(including corun-dum/spinel and calcined-bauxite/spinel) castables were disucssed in this paper,It expounded the tech-nical characters and virtues of high grade and medi-um grade spinel and the importance of the develop-met and successful application of calcined-bauxite/spinel castalbes.Because of the technical and eco-nomical feasibility,the developement and application of spinel and high-alumina/spinel castables,in which domestic refractory workers play an important role ,have been flurishing.
