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Leaching improvement of ceramic cores for hollow turbine blades based on additive manufacturing

Advances in Manufacturing 2019年第4期7卷 353-363页

作者： Wei-Jun Zhu Guo-Qiang Tian Yang Lu Kai Miao Di-Chen Li School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191People's Republic of China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong UniversityXi'an 710049People's Republic of China School of Aeronautical Engineering Zhengzhou University of AeronauticsZhengzhou 450046People's Republic of China

The precision casting method based on aluminabased ceramic cores is one of the main techniques used to manufacture hollow turbine *** manufacturing(AM)technology provides an alternate solution to fabricating ceramic cores quickly and *** the complexity of the structure increases and the strength of the material improves,the leaching process of the cores becomes more *** study proposes a compound pore-forming method to increase the porosity of ceramic cores by adding a preformed-pore agent and materials that convert to easy-to-corrode *** preformed-pore agents(e.g.,carbon fibers)can be burned off during sintering to form pores before the leaching,and the easy-to-corrode phases(e.g.,CaCO3,SiO2,^-A12O3)can be leached firstly to form pores during the leaching *** pores formed in the aforementioned two stages increase the contact area of the cores and leaching solution,thus improving the leaching *** the current study,the additive amount of the preformed-pore agent was optimized,and the effect of the easy-to-corrode phases on the comprehensive properties of the cores was then *** on this,the corresponding model was established.

关键词： Alumina-based ceramic core Leaching alkali solution Additive manufacturing(AM) Stereolithography

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Low-concentration sodium hydroxide solution injection in normal liver parenchyma of rabbits

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Hepatobiliary & Pancreatic Diseases International 2005年第2期4卷 285-290页

作者： Tian-An Jiang, Qi-Yu Zhao, Miao-Yan Chen and Shu-Sen Zheng Hangzhou, China Department of Ultrasonography, First Affiliated Hos- pital , and Distance Education Center , and Department of Hepatobiliary and Pancreatic Surgery, First Affilia- ted Hospital , Zhejiang University School of Medicine, Hang- zhou 310003, China Department of Hepatobiliary and Pancreatic Surgery First Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003 China.

BACKGROUND: Percutaneous ethanol injection has been widely used as a non-surgical therapy for liver cancer, but it has some shortcomings such as local diffusion and une- qual permeation. This study was designed to observe the volume, controllability and completeness of necrosis after injection of low concentration sodium hydroxide in the normal liver parenchyma so as to assess its possibility in treatment of liver cancer instead of ethanol. METHODS: Twenty-seven New Zealand rabbits were di- vided randomly into 9 groups (Aa, Ab, Ac, Ba, Bb, Bc, Ca, Cb, and Cc) by a 3 × 3 (three-by-three) factorial de- sign, each consisting of 3 rabbits. Group A was given sodi- um hydroxide solution at a concentration of 5%, while B at 2.5% and C at 1% in liver parenchyma. Each group re- ceived three doses of the solution: a (0.2 ml), b (0.5 ml) and c (1.0 ml). Then another 3 rabbits as side-effect group were dropped with sodium hydroxide solution in their liver lobe space. Liver and renal function changes in all the rab- bits were compared after injection with pre-injection. RESULTS: All the lesions were localized. At the concentra- tion of 2.5% and 5%, the lesion volume increased with the dose increased from 0.2 ml to 1.0 ml (P solution could control local complete necrosis in normal liver. With regard to safety, 2.5% alkali solution is considered promis- ing as a new agent for intratumoral injection therapy in- stead of ethanol.

关键词： alkali solution liver injection ultrasonography

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