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Fabrication and Mechanical Properties of Mo-Al2O3 Cermets by Using Ultrafine Molybdenum and Nano-sized Alumina Powders

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Abstract

To improve the performance of Mo-based cermets, Mo-(Ni)-Al2O3 cermets were prepared with raw materials of nano-sized Al2O3 powder. The effects of Al2O3 and Ni additions on the densification behavior, microstructure, bending strength, and hardness of the Mo-(Ni)-Al2O3 cermets were experimentally analyzed. The results showed the content of Al2O3 had a great influence on the degree of densification of Mo-Al2O3 cermets at the sintering temperature of 1600°C. In addition, the Al2O3 particles were distributed evenly in the matrix of Mo-based cermets, which refined the grains of Mo and increased the hardness of cermets. Because of the weak interfacial bonding strength between Al2O3 ceramic phase and Mo metal phase, the bending strength decreased continuously with increasing Al2O3 content. However, Ni addition improved the wetting and adhesion of Al2O3 and Mo. With the addition of Ni, the relative density increased, and thus hardness and bending strength were improved.

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Acknowledgements

This work was financially supported by the State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, China.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Ben Chen, Zhi-Bo Li, Guo-Hua Zhang & Kuo-Chih Chou

  2. Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing, 100083, China

    Ben Chen, Zhi-Bo Li, Guo-Hua Zhang & Kuo-Chih Chou

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  1. Ben Chen
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  2. Zhi-Bo Li
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Correspondence to Guo-Hua Zhang.

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Chen, B., Li, ZB., Zhang, GH. et al. Fabrication and Mechanical Properties of Mo-Al2O3 Cermets by Using Ultrafine Molybdenum and Nano-sized Alumina Powders. JOM 73, 3451–3459 (2021). https://doi.org/10.1007/s11837-021-04848-y

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