TY - JOUR
AU - Chen, Junhong
AB - An AlON–SiC–Al2O3 composite was successfully prepared by sintering the phenolic resin-bonded Al–Si–Al2O3 green body at 1700 °C in flowing nitrogen. The results show that the major phases of the samples after sintering are α-Al2O3, γ-AlON, and β-SiC. The reaction mechanism is as follows: At high temperatures, the phenolic resin is pyrolyzed to produce nanoscale, highly reactive residual carbon, which greatly reduced the stability of α-Al2O3 fine particles and also improves the wettability of Al(l) to α-Al2O3. After a good physical contact between Al(l) and α-Al2O3 is achieved, octahedral γ-AlON is formed by the aluminum thermal nitridation of α-Al2O3 fine particles at 1700 °C [Al(l)+C(s,resin)+Al2O3(s)+N2(g)→Al5O6N(s)+CO(g)\documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$ {\text{Al}}({\text{l}}) + {\text{C}}({\text{s}},{\text{resin}}) + {\text{Al}}_{2} {\text{O}}_{3} ({\text{s}}) + {\text{N}}_{2} ({\text{g}}) \to {\text{Al}}_{5} {\text{O}}_{6} {\text{N}}({\text{s}}) + {\text{CO}}({\text{g}}) $$\end{document}]. Then, the CO(g) released by the reaction is rapidly absorbed by the Si(l) in the system to form stable β-SiC phase, resulting in a decrease in PCO, which further promotes the formation and stability of γ-AlON. The Al2O(g) and Al(g) are the major gas phases in the system at 1700 °C, which further participated in the reaction of γ-AlON formation and makes γ-AlON grow in a step growth method. The γ-AlON and β-SiC stably coexist as reinforcing phases in the samples, forming an AlON-SiC-Al2O3 composite, which has a high cold crushing strength of 389–443 MPa. The reaction model is established.
TI - Formation mechanism of γ-AlON and β-SiC reinforcements in a phenolic resin-bonded Al–Si–Al2O3 composite at 1700°C in flowing N2
JF - Journal of Materials Science
DO - 10.1007/s10853-020-04450-8
DA - 2020-05-18
UR - https://www.deepdyve.com/lp/springer-journals/formation-mechanism-of-alon-and-sic-reinforcements-in-a-phenolic-resin-SyoolJZn2B
SP - 5772
EP - 5781
VL - 55
IS - 14
DP - DeepDyve
ER -