Papers by Author: Zhi Peng Xie

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Authors: Zhong Zhou Yi, Min Lu, Ke Shan, Nan Li, Feng Rui Zhai, Zhi Peng Xie
Abstract: The thermal barrier coating samples of different thickness with alumina coated zirconia and zirconia as coating materials were prepared on the surface of heat resistant alloy steel substrate after activation treatment with NiCoCrAlY as adhesive transition layer by plasma spraying method and spray gun quick spraying process. The bonding strength and thermal insulation property of two kinds of ceramic coating with the same thickness were compared by the test results of bonding strength, high temperature heat insulation and microstructure, and the relationship between the coating thickness and heat insulation effect were investigated. The results indicate that the structure and property of thermal barrier coating using nanoAl2O3 coated ZrO2-Y2O3 powder are superior to that using single zirconia powder. The thermal insulation property of the thermal barrier coating increased with the increasing of coating thickness, and the advantage is more obvious with temperature increasing.
Authors: Wei You Yang, Zhi Peng Xie, Hua Tao Wang, Guo Quan Liu, He Zhuo Miao, Li Nan An
Authors: Wei Lin, Xin De Bai, Yun Han Ling, Zuoz Hong Jiang, Zhi Peng Xie
Authors: Xian Feng Yang, Zhi Peng Xie, Lin Lin Wang
Abstract: An innovative processing route for fabricating porous zirconia ceramics has been developed based on traditional injection molding method. Azodicarbonamide (AC) was used as the foaming agents and mixed with the zirconia powder and conventional binders (polypropylene, ethylene/vinyl acetate, paraffin wax and stearic acid). There were three stages in the foaming course: (1) Small bubbles nucleated when AC decomposed into N2 and CO in the barrel. (2) Viscosity and pressure drop led to the growth of the bubbles when the melt feedstock was injected into the die cavity. (3) The porous structure was kept in the solidified body. The AC content and injection parameters were optimized to control the pore density and size. The porous green body was debinded at the heating-up rate of 0.5 °C /min to 450°C and sintered at 1550°C. Samples with porosity of 40%-50% and pore sizes from 200-250μm were prepared when the addition of AC was 0.3% by weight. The results showed that ceramic injection molding method was also suitable for fabricating the porous ceramics.
Authors: Hua Tao Wang, Zhi Peng Xie, Wei You Yang, Guo Quan Liu, Li Nan An
Abstract: A novel process with low cost to fabricate SiCN MEMS based on UV lithographic technique is present in this paper. The prepared MEMS are very promising to be used in high-temperature environments. By adding a photo initiator to the polysilazane precursor, the precursor becomes UV-sensitive and can be solidified upon exposure to UV light, which leads to the formation of UV photo lithographical patterns. Key issues of the fabrication process are investigated and various SiCN MEMS structures are fabricated by this technique.
Authors: Jing Tao Ma, Zhi Peng Xie, He Zhuo Miao, Bao Qing Zhang, Xu Ping Lin
Abstract: A new ceramic gelcasting system was developed in this paper. The rheological behavior of alumina suspension with an addition of polymer was examined. Particular attention is given to the flexural strength of green body prepared from gelcasting in the presence of polymer.
Authors: Jian Yi, Xiao Dong He, Yue Sun, Zhi Peng Xie, Wei Jiang Xue, Fen Yan Cao
Abstract: The sp3C doped SiC superhard nanocomposite films had been deposited on stainless steel (SS) substrates at different temperature by electron beam-physical vapor deposition (EB-PVD). The sp3C doped SiC film was studied by grazing incidence X-ray asymmetry diffraction (GIAXD), and X-ray photoelectron spectroscopy (XPS). The results of GIAXD showed that the sp3 doped SiC nanocomposite films were not perfect crystalline, which was composed with fine SiC nanocrystals, and a second phase very similar with diamond like carbon (DLC). XPS analysis showed that the excess C existing in films and turned from diamond into DLC from the surface to inner of film.
Authors: Yan Gao, Kang Ming Huang, Zhen Kun Fan, Zhi Peng Xie
Abstract: Water-soluble binder based injection molding of submicrometer-sized and stabilized zirconia was reported in this paper. The binder phase is chosen as the mixtures of polyethylene glycol, high-density polyethylene, polyvinyl butyral and stearic acid. Binder removal is accomplished by a two-steped process. The water-soluble constituent is firstly removed by dissolution in the water and the remaining is removed through the followed thermal treatment. The apparent viscosities of different kinds of feedstock were tested. The influences of water-leaching time and temperature on the efficiency of PEG removal were discussed.
Authors: Xin Gang Yu, Lan Yun Liu, Yan Bin Zuo, Zhi Peng Xie, Bo Lin Wu, Jin Long Yang, Jian Bao Li, Yong Huang, Lin Wang, Yi Gong
Abstract: A heated sprue device for ceramic injection moulding was used to research the defects in injection-moulded technical ceramics. By use of the heated sprue device, the problem of sprue solidification was resolved and the density of the injection moulding specimens was increased while the defects eliminated. The influence of the processing parameters on the defects of the injection molding specimens was investigated in detail by X-ray radiography camera and photograph. It turns that the sprue solidification time has much influence on the defects in injection-moulded technical ceramics. Reasons causing the results above were also analyzed. Based on the research, bars of 20mm in diameter without macroscopic defects and turbine blade of fine property with Si3N4/SiC(w) materials were prepared by injection moulding.
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