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Thermodynamic analysis on preparation of fibrous NiO precursor powders with oxalate precipitation process ZHAN Jing(湛 菁), ZHANG Chuan-fu(张传福), LI Tie-jing(李铁晶), WU Jian-hui(邬建辉) (School...-coordinated Ni(NH3)2+n(n=1, 2, …, 6) and the morphology of NiO powder precursor is fibrous; when pH is below 8.0, nickel ion directly reacts with C2O2-4 and the morphology of NiO powder precursor......
Shape-controlled synthesis of novel precursor for fibrous Ni-Co alloy powders ZHAN Jing1, 2, ZHOU Di-fei1, ZHANG Chuan-fu1 1. School of Metallurgical Science and Engineering, Central South... in the precursor. A fibriform precursor is a complicated ammonia-containing nickel-cobalt oxalate. The uniform shape-controlled fibrous precursor is obtained under the following optimum conditions: ammonia......
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and compact fiber into loose and curved fiber with rough surface. Key words: precursor; fibrous nickel powder; precipitation transformation; thermal decomposition 1 Introduction In recent years, nickel... particles. However, the fibrous precursor particles with good dispersion keep fibrous with good dispersion after decomposition, meaning that the final product inherits the morphology of precursor. It can......
Solidification and remelting of Al through Al2O3 fibrous preform under centrifugal force HU Guo-xin(胡国新), LIU Jian-ju(刘建局), ZHANG Li-xiang(张利祥), TIAN Qin-wei(田芩蔚) School of Mechanical and Power... infiltration dynamics and the material thermodynamics. Key words: fibrous preform; centrifugal infiltration casting; solidification; remelting; heat transfer 1 Introduction Due to the increasing use......
Thermodynamic analysis on synthesis of fibrous Ni-Co alloys precursor and Ni/Co ratio control ZHAN Jing1, 2, HE Yue-hui1, ZHOU Di-fei2, ZHANG Chuan-fu2 1. State Key Laboratory for Powder... with fibrous morphology can be obtained. Key words: thermodynamic analysis; nickel-cobalt alloy; nickel-cobalt oxalate precursor; predefined Ni/Co ratio; fibre-shape 1 Introduction As important......
Surface Modification of Natural Fibrous Brucite with Stearic Acid曹曦,传秀云,ZHOU Shuhui,HUANG DubinSchool of Earth and Space Sciences,Peking University摘 要:Fibrous brucite,a kind of brucite with unique structure and physical properties,was modified with stearic acid as a surface modifier.In order to investigate the mechanism of surface modification......
THE INFLUENCE OF PRECURSOR VARIABLES ON THE PHASE FORMATION, MICROSTRUCTURE AND TRANSPORT PROPERTY OF Bi-2223/Ag TAPES J.M.Yoo1,J.W.Ko1,C.H.Jiang2,G.W.Qiao2 (1.Materials Engineering Dept., Korea... prepared with spray-died powders, which are of differentparticle sizes and phase assemblages by varying the annealing time in pure oxygen.Longer time annealing degraded the reactivity of precursor......
Structural characteristics,dispersion,and modification of fibrous bruciteXi Cao,Xiu-yun ChuanKey Laboratory of Orogen and Crust Evolution of the Education Ministry of China,School of Earth and Space Sciences,Peking University摘 要:Fibrous brucite has very unique structure and physical properties.Brucite fibers were exfoliated into single nanofibers......