期刊
RARE METALS
卷 39, 期 5, 页码 589-596出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01385-6
关键词
Transition metal; Sialon; Whiskers or fibers; Nitridation reaction; Flexural strength; Compression resistance
资金
- National Natural Science Foundation of China [51772140, 51862024]
- Natural Science Foundation of Jiangxi Province [20171ACB21033]
- Science and Technology Project of the Education Department of Jiangxi Province [GJJ170573]
- Graduate Innovation Special Fund of Nanchang Hangkong University [YC2018-S358]
Sialon ceramics were prepared by the nitridation of Si, Al and Al2O3 powders with the transition metals (Fe, Co, Ni) catalysts. The phase composition, microstructure and mechanical properties of specimens were studied. Compared with the catalyst-free specimen, the addition of Fe, Co and Ni greatly promoted the nitridation process of Sialon ceramics and improved the weight gain rate and mechanical properties of specimens. With the increased content of catalysts, the apparent porosity of the products decreased first and then increased, contrary to flexural strength and compressive strength. The specimen with 2.5 wt% Fe had the highest flexural strength 145.8 MPa, and it exhibited the highest compressive strength of 594.6 MPa when Co content was 2.5 wt%, whereas they were 71.9 and 78.7 MPa, respectively, when without catalyst.
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