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Pang H.,Dalian University of Technology | Tian P.,Dalian University of Technology | Wang J.,No 52 Institute Of China Ordnance Industry | Wang X.,Dalian University of Technology | And 2 more authors.
Materials Letters | Year: 2014

Basic magnesium carbonate/magnesium carbonate microstructured materials have been synthesized as by-products in a simulative flue gas absorption technology through a direct carbonation of Mg-based (brucite) slurry. A probable carbonation mechanism from brucite to magnesite is proposed via a couple of gas-solid reaction pathways. Experimental results demonstrate that the reactions undergo transitional basic magnesium carbonate carnations constructed by microflakes and then development of rhombohedral magnesium carbonate microstructured crystals with further incorporation of carbon dioxide. Furthermore, the carbonation parameters of brucite are also studied in detail. Since the novel approach is simple and has a high additional value in combination with the flue gas absorption technology, the process could bring significant progress for residue treatment in chemical CO2 capture. © 2014 Elsevier B.V. Source


Hou X.-M.,Baotou Vocational and Technical College | Chen X.-Y.,Baotou Beifang Benchi Heavy Duty Truck Co. | Liu S.-F.,No 52 Institute Of China Ordnance Industry
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

Tooth surface peeling of the coach driving screw bevel gear was analyzed by means of macroscopic fracture observation, hardness test, microstructure examination. The result shows that the main reason of early peeling is the exceeding contact stress at the top of tooth caused by abnormal contact at the tooth surface. The weakened grain boundary and the thinner carburized layer aggravate the early peeling. Source


Dong H.-C.,No 52 Institute Of China Ordnance Industry | Jin Y.,No 52 Institute Of China Ordnance Industry | Tian X.-T.,No 52 Institute Of China Ordnance Industry | Bai F.-Q.,No 52 Institute Of China Ordnance Industry | Tian T.,No 52 Institute Of China Ordnance Industry
Yejin Fenxi/Metallurgical Analysis | Year: 2014

A rapid method was proposed for determining Mn and Fe in nickel-copper alloy by inductively coupled plasma atomic emission spectrometry(ICP-AES) after the dissolution of sample with nitric acid. By selecting 259.940 nm and 257.610 nm as Fe and Mn analytical lines respectively and using calibration curve after matrix matching, the matrix and coexisting elements showed no interference under optimized instrument working parameters. The detection limits of the method were 0.006% for Mn, and 0.0001% for Fe. In determining Mn and Fe in nickel-copper alloy by this method, the results were consistent with the certified values. The relative standard deviations (RSDs) were 1.0% for Mn and 0.88% for Fe. Source

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