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Study on Preparation of New Type Coated TiH2 in Aluminum Production

Author: ZhangCongRong
Tutor: ZhaoKang
School: Xi'an University of Technology
Course: Materials Science
Keywords: Coated Vesicant Hydrogen Release Aluminum foam
CLC: TB383
Type: Master's thesis
Year: 2004
Downloads: 154
Quote: 0
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Abstract


Technical Difficulties - this study prepared for the melt foam legal system of aluminum foam blowing agent into the high temperature aluminum melt quickly release hydrogen, limits the the homogenization unit operation time, proposed to use chemical-coated TIH 2 foaming agent to prepare aluminum foam, the main research the TiH 2 chemical foaming agent coated. Prepared surface coated Al 2 O 3 , the SiO 2 and composite coated Al 2 O 3 and SiO 2 of TiH 2 coated foam. Orthogonal experiment, the optimum parameters of the various coating process. Morphology observed by scanning electron microscopy (SEM) coated foaming agent; spectrometer coated foaming agent component test; using the the homemade the hydrogen releasing experimental device test TIH 2 coated hydrogen release characteristics of the blowing agent; to use coated foaming agent aluminum foam prepared in the laboratory. Experimental results show that: 1) coated Al the 2 O 3 of the optimum process parameters: of NaAlO 2 concentration of 0.06 mol / L, AL 2 (SO 4 ) 3 concentration of 0.01 mol / L, temperature 35 ° C, the titration rate to 60 ml / h, with vigorous stirring, titration the system PH value 5.2) coated SiO 2 optimal parameters: the Na 2 the SiO 3 concentration for 1 mol / L, HCl concentration for 2 mol / L, a temperature of 85 ° C, the titration rate as 60 ml / h, with vigorous stirring, titration system PH value of 9.3) coated TiH 2 hydrogen releasing performance major changes, single-coated Al 2 O 3 of TIH 2 will start to release hydrogen delay of about 60 seconds, single covered SiO 2 TiH 2 will begin to release hydrogen delayed for up to 70 seconds or so, first coated SiO 2 coated Al 2 O 3 the TIH 2 began to release hydrogen time of 75 seconds, the first coated Al 2 O 3 and then coated SiO 2 Ti H 2 postponed the hydrogen release time up to 90 seconds. To postpone the hydrogen release is better than the single-layer coated Al of coated SiO 2 of the TIH 2 2 O 3 of TiH 2 , the first coated Al 2 O 3 and then coated SiO 2 the TIH 2 < / sub> to postpone the hydrogen releasing effect. 4) Encapsulated the TIH 2 blowing agent can be prepared the holes more uniform aluminum foam, which TiH 2 composite coating prepared bubble Xi'an University of Technology Master's degree paper hole aluminum foam is more uniform. 5) to study the mechanism of chemical-coated: PH value of to control TIHZ suspension in about 5, through non-nucleation in TIH: A12O3 coating layer; control system pH value of about 9, available 510: film coated. 6) Analysis of the role of the cladding layer on the delayed release hydrogen, it is the result of the combined effect of the three aspects: the cladding layer delaying the process of heat conduction, coated slow TIH: the speed of the decomposition reaction, the coated hydrogen The diffusion of atoms to prevent escape play a role. Keywords: coated hydrogen releasing aluminum foam blowing agent

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