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摘要
Sialon powders with fibers were successfully prepared by using Si powder, Al powder and Al2O3 powder as raw materials and Ni powder as catalyst. Effects of temperature (1300~1450 °C) and content of Ni (0~7.5wt.%) on weight gain rate, phase composition and microstructure ofproducts were studied. The addition of Ni resulted in the increasing of the weight gain rate of the products by 1.3~3.9 times, which indicated Ni greatly promoted the degree of nitridation. Addition of Ni reduced the complete-nitridation temperature of Si over 100 °C as well as the synthesis temperature of Sialon. The appropriate content of Ni should be 1.25~2.5 wt.%, more than that would lead to the decrease of weight gain rate. Ni-containing spheres on the tips ofSialon fibers were found in the products, indicating that Ni promoted the formation of Sialon one-dimensional nanostructures through VLS mechanism. ? 2019 Editorial Office of Journal of Ceramics. All Rights Reserved.
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