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Featured researches published by Aiju Li.


Journal of Wuhan University of Technology-materials Science Edition | 2017

Structural and regulating characteristics of adjustable annulus-clearance nozzle used in supercritical fluid precipitation

Yanpeng Qu; Yan Liu; Songming Liu; Weiqiang Wang; Aiju Li

A new type of adjustable nozzle with an annulus clearance between the surfaces of a revolved solid and the matched hole was analyzed, which contained matching parts, regulating parts, guiding elements, and sealing part. The general regulating function of the adjustable nozzle was derived and the regulating and matching characteristics were also analyzed. Through the analysis, it was concluded that the matching-profile curve of either the revolved body or matched hole should be chosen as a straight line in order to keep the linear regulating feature. Moreover, the multi-annulus-clearance nozzle was designed, and some experiments were carried out on preparing budesonide particles with the nozzle. According to the experimental results, it was proved that the annulus nozzles is practical in preparing micro-particles by supercritical fluid precipitation method.


ASME 2011 Pressure Vessels and Piping Conference: Volume 6, Parts A and B | 2011

Study on the Microstructure of 20 Steel With Strain Aging

Mengli Li; Weiqiang Wang; Aiju Li

20 steel thick-wall high-pressure pipes are widely used in chemical industry in China, but brittle fracture accidents of them happen frequently in recent years. The strain aging steel pipes in this research were artificially made in the laboratory and naturally occurred in fabrication or service. The microstructure of strain aging in samples taken from the unused pipes and the accident pipes caused directly or mainly by strain aging were observed with optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results show that: (1)uniform ferrite and pearlite with uniform lamellar structure can be achieved with normalizing; lamellar pearlite fractures and distorts while a large number of dislocation cells, micro-holes or cracks appear in material after strain aging; and broken distorted pearlite changes to uniform spherical structure after stress relieving; (2) both the samples taken from unused and accident pipes which strain aging artificially in the laboratory and naturally in fabrication or service have the same characteristics as following: the basic changes of microstructure after strain aging cannot be observed with optical microscopy, but can be observed with scanning electron microscopy and transmission electron microscopy.Copyright


ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference | 2010

Analysis on Layer Cracking of Urea Reactors

Mengli Li; Weiqiang Wang; Yan Liu; Aiju Li; Mingda Song; Shugen Xu; Yuliang Cui; Xiao Yuan

A destructive explosion of a multilayered urea reactor on Mar. 21, 2005 in Shandong Province, China resulted in huge losses. About 10 urea reactors were scrapped in inspection and assessment after the explosion for the reason of layers severely cracking. Three scrapped urea reactors including the explosive reactor were anatomized layer by layer and 12 cracking reactors, and others were investigated for further study. Cracking morphology was observed in detail. Taking account of application conditions, the layer cracking can be divided into four categories: 1) severe cracking from the outmost layer inward, 2) severe cracking from the innermost layer outward, 3) randomly cracking from the outmost layer inward, or the innermost layer outward, or the middle layer, and 4) slight cracking. The reason for the layer cracking is SCC which is proved by means of visual observing the characteristics of the reactor cracking, metallographic experimenting on the samples taken from the cracking regions in the reactor and analyzing the corrosion products in the clearances between layers, the clearances of the cracks, and spills from air vent. The authors analyzed factors which caused different cracking categories from material, stress and media, gave advice on the leak detection of urea reactors: either the quality and flow of the leak detection steam should be strictly controlled, or better leak detection method should be used.Copyright


Surface & Coatings Technology | 2007

Fabrication and adhesive properties of thin organosilane films coated on low carbon steel substrates

Guoli Li; Xueming Wang; Aiju Li; Weiqiang Wang; Liqiang Zheng


Journal of Materials Processing Technology | 2007

Influence of thermal curing on the fabrication and properties of thin organosilane films coated on low carbon steel substrates

Xueming Wang; Guoli Li; Aiju Li; Zuoguang Zhang


Engineering Failure Analysis | 2005

Fatigue and brittle fracture of carbon steel process pipeline

Aiju Li; Weiqiang Wang; Xueming Wang; Dong Zhao


Archive | 2010

Method for determining defects of multilayer binding vessel by acoustic emission

Huaixiang Cao; Xuedong Chen; Zhichao Fan; Aiju Li; Qingling Li; Mingda Song; Weiqiang Wang; Junfei Wu; Shugen Xu; Tiecheng Yang


Engineering Failure Analysis | 2009

The explosion reason analysis of urea reactor of Pingyin

Weiqiang Wang; Aiju Li; Yanyong Zhu; Xiaojing Yao; Yan Liu; Zhonghe Chen


Engineering Failure Analysis | 2010

Failure analysis of the brittle fracture of a thick-walled 20 steel pipe in an ammonia synthesis unit

Haoxuan Cui; Weiqiang Wang; Aiju Li; Mengli Li; Shugen Xu; Huadong Liu


Archive | 2009

A simplification method of defects in multilayered vessels detected by acoustic emission detection

lt; strong gt; Weiqiang lt Wang; Huadong Liu; Mingda Song; Aiju Li

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