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Effect of the withdrawal rate on the microstructure and thermal durability of a third-generation single crystal superalloy

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Progress in Natural Science:Materials International 2021年第3期31卷 493-500页

作者： Yunsong Zhao Mai Zhang Luyan Yang Yuanyuan Guo Jian Zhang Hui Lu Yanhui Chen Dingzhong Tang Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Institute of Microstructure and Property of Advanced Materials Beijing University of Technology

Single crystal Ni-based superalloys are the typical structural materials for high-pressure turbine blades,and their microstructure is critical in determining their mechanical *** withdrawal rate is a key parameter affecting the microstructure during the single crystal growth *** the present work the effect of the withdrawal rate on the microstructure of a third-generation single crystal superalloy containing 6.8 wt% Re has been investigated,and the creep resistance of the alloy *** results showed that increased withdrawal rate refined the dendritic structure,reduced dendritic arm spacing,promoted the growth of secondary tertiary dendrites and decreased solidification segregation with a reduced size of γ’ *** porosity density of the ascast alloy first decreased and then increased with the withdrawal rate,while the minimum porosity densityoccurred when the alloy was under the solidification condition of withdrawal rate of 4.5 mm/*** maximum creep rupture life of 326.4 h of the heat-treated alloys under the test condition of 1100℃/140 MPa also appeared at the alloys under the withdrawal rates of 4.5 mm/*** is believed that the minimum porosity density and reduced size of the γ’ phase may be the main reasons for the enhanced creep rupture life of the alloys with withdrawal rates of 4.5 mm/*** investigation provides theoretical support and a practical basis for the development of third-generation single crystal superalloys.

关键词： Nickel-based superalloy Withdrawal rate Microstructure thermal durability

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thermal stability and mechanical properties of thick thermal barrier coatings with vertical type cracks

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Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 29-35页

作者： Zhe LU Min-Sik KIM Sang-Won MYOUNG Je-Hyun LEE Yeon-Gil JUNG In-Soo KIM Chang-Yong JO School of Nano & Advanced Materials Engineering Changwon National University High Temperature Materials Research Group Korea Institute of Materials Science

The thermal stability and failure mechanism of thick thermal barrier coatings(TBCs) with and without vertical type cracks were investigated through the cyclic thermal exposure and thermal-shock tests. The TBC systems with thickness of about 2000 μm in the top coat were prepared by an air plasma spray(APS) on the bond coat of about 150 μm in thickness prepared by APS. The adhesive strength values of the as-prepared TBCs with and without vertical type cracks were determined to be 24.7 and 11.0 MPa, respectively, indicating the better interface stability in the TBC with vertical type cracks. The TBC with vertical type cracks shows a better thermal durability than that without vertical type cracks in the thermal cyclic exposure and thermal-shock tests. The hardness values of the as-prepared TBCs with and without vertical type cracks were found to be 6.6 and 5.3 GPa, respectively, which were increased to 9.5 and 5.5 GPa, respectively, after the cyclic thermal exposure tests. These results indicate that the vertical type cracks developed in the top coat are important in improving the lifetime performance of thick TBC in high temperature environment.

关键词： thermal barrier coating air plasma spray vertical type crack thermal durability

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Negative thermal Expansion up to 1000℃ of ZrTiO4-Al2TiO5 Ceramics for High-Temperature Applications

Negative Thermal Expansion up to 1000℃ of ZrTiO4-Al2TiO5 Ce...

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The 3～〔rd〕International Conference on High-Performance Ceramics(CICC-3)（2）

作者： Ik Jin Kim Hyung Chul Kim In Sub Han Christos G.Aneziris Institute for Processing and Application of Inorganic Materials（PAIM） Department of Materials Science and Engineering Hanseo UniversitySeosan city Chungnam Korea Institute for Processing and Application of Inorganic Materials（PAIM） Department of Materials Science and Engineering Hanseo UniversitySeosan city Chungnam Korea Energy Materials Research Team Korea Institute of Energy Research （KIER） Taejeon 305-343 South Korea Institute of Ceramic Glass and Construction MaterialsTechnical University of Freiberg Agricola strasse 17 09599 FreibergGermany

＜正＞ High temperature structural ceramics based on Al2TiO5-ZrTiO4 （ZAT） having excellent thermal-shock-resistance were synthesized by a reaction sintering. The ZAT ceramics sintered at 1600℃had a negative thermal expansions up to 1000℃and a much lower thermal expansion coefficient （0.3 -1.3 ×10-6 /K） than that of polycrystalline Al2TiO5 （1.5 ×10-6 /K）. These low thermal expansion are apparently due to a combination of microcracking caused by the large thermal expansion anisotropy of the crystal axes of the Al2TiO5 phase. The microstructural degradation of the composites after various thermal treatment for high temperature applications were analyzed by scanning electron microscopy, X-ray diffraction, ultrasonic and dilatometer.

关键词： Al2TiO5 ZrTiO4 negative thermal expansion thermal-shock-resistance thermal durability

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