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专利原文的题目 Method of producing composite material of carbon nanometer pipe/ nickel/ aluminum improving and toughening alumina radicel SciFinder中的题目 Preparation of alumina-based composite reinforced by in-situ synthesized carbon nanotubes, Ni and Al by using magnetic agitation, dewatering and calcining, pressing, and sintering
原文的摘要 SciFinder的摘要 The title process comprises: (1) adding nickel nitrate hexahydrate and Al powder in 1L deionized water by a wt. ratio of 0.127:1 to 1.24:1, and dropping 0.01-1 mol/L NaOH or 36% ammonia soln. under magnetic agitation to pH 7-12 to obtain Ni(OH)2/Al/Al(OH)3 ternary colloid under a wt. ratio of Ni:Al = 0.025:1 to 0.25:1 and Al:Al(OH)3 = 0.01:1 to 0.654:1, (2) dewatering at 150-300° and 150-350 mL/min nitrogen for 2-4 h, and calcining at 350-500° for 2-4 h to obtain NiO/Al/Al2O3 catalyst precursor powder, (3) paving in a quartz boat, aerating nitrogen, heating by 8°/min to 500-650°, reducing with 25-250 mL/min H2 for 1.5-4 h to obtain Ni/Al/Al2O3 catalyst, (4) aerating a mixt. of nitrogen and methane (vol. ratio = 6:1 to 12:1) by a flow rate of 420-780 mL/min, allowing reaction at 500-650° for 0.1-4 h, and cooling under 5-75 mL/min nitrogen to 20-25° to obtain carbon nanotubes/Ni/Al/Al2O3 composite powder, and (5) pressing at 20-25° and 350-1200 MPa for 30 s-2 min, sintering at 10-11-10-7 torr and 1000-1350° for 0.5-6 h, and re-pressing at 1250-2000 MPa for 30 s-2 min to give the title product, or pressing at 500-1000° and 100-1000 MPa for 2-12 h to give the title product. The composite powder can be well controlled of the ratios of Ni or Al to alumina, and solved of the dispersion problem of Al and carbon nanotubes. Carbon nanotubes has high bonding strength with the base to form net structure. • The process of preparing alumina-base composite material includes the following steps: dropping sodium hydroxide solution or ammonia water to solution with nickel nitrate hexahydrate and aluminum powder for reaction to produce Ni(OH)2/Al/Al(OH)3, dewatering and calcining the obtain ternary colloid to obtain NiO/Al/Al2O3, reducing the obtained NiO/Al/Al2O3 into Ni/Al/Al2O3, introducing mixed methane and nitrogen gas after stopping hydrogen introduction and reacting catalytically at certain temperature for several hours to obtain carbon nanotube /Ni/Al/Al2O3 composite powder with controllable carbon nanotube content, and final powder metallurgy and hot extruding to obtain carbon nanotube/Ni/Al/Al2O3 composite material.; The present invention has the advantages of well controlled proportion of Ni, Al and Al2O3, excellent dispersion of Al and carbon nanotube in the composite material, high comprehensive performance of the composite material, etc.
