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中国材料大会2012

作者： Jiansheng Yao Dingzhong Tang Xiaoguang Liu Chengbo Xiao Xin Li Chunxiao Cao Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

ISBN: (纸本)9783037856086;3037856084

The interfacial reactions between ceramic moulds and DZ417G and DZ125 superalloys were investigated. The microstructure and composition of the interface region were observed by optical microscope, X-ray diffraction and scanning electron microscope with energy dispersive spectroscopy. The results showed that （Al1-xCrx）2O3 solid solution phase with pink color was formed from the dissolution of Cr2O3 and Al2O3 and vapour phase, which was transferred to the reaction surfaces. The reaction layer thicknesses of DZ417G and DZ125 alloys were about in the range of 40-50μm. The interface reaction product between DZ417G alloy and ceramic mould was TiO2 and the product between DZ125 alloy and ceramic mould was HfO2 .

关键词： DZ417G superalloy DZ125 superalloy ceramic moulds Interface reaction

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Microstructure and mechanical properties of TiAl castings produced by zirconia ceramic mould

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China Foundry 2011年第4期8卷 371-375页

作者： Chen Yanfei Xiao Shulong Tian Jing Xu Lijuan Chen Yuyong School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Owing to their low density and attractive high-temperature properties, gamma titanium aluminide alloys (TiAl alloys, hereafter) have significant potential application in the aerospace and automobile industries, in which these materials may replace the heavier nickel-based superalloys at service temperatures of 600-900℃. Investment casting of TiAl alloys has become the most promising cost-effective technique for the manufacturing of TiAl components. ceramic moulds are fundamental to fabricating the TiAl casting components. In the present work, ceramic mould with a zirconia primary coat was designed and fabricated successfully. Investment casting of TiAl blades and tensile test of specimens was carried out to verify the correctness and feasibility of the proposed method. The tensile test results indicate that, at room temperature, the tensile strength and the elongation are about 450 MPa and 0.8%, respectively. At 700℃, the tensile strength decreases to about 410 MPa and the elongation increases to 2.7%. Microstructure and mechanical properties of investment cast TiAl alloy are discussed.

关键词： investment casting TiAl alloys ceramic moulds zirconia

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