Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 8    August 2013

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Frictional ignition of Ti40 fireproof titanium alloys for aero-engine in oxygen-containing media
Guang-bao MI1,2, Xu HUANG1, Jing-xia CAO1, Chun-xiao CAO1, Xiu-song HUANG2

1. Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys,
Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. National Center of Novel Materials for International Research, Tsinghua University, Beijing 100084, China

Abstract:The effect of friction pressure p and oxygen concentration xO on the fireproof performance of Ti40 titanium alloy was studied by frictional ignition test, the p—xO relationship quantitatively describing the fireproof performance of Ti40 was established and the fireproof mechanism of Ti40 was analyzed by SEM, XRD and EDS. The results show that the p—xO relationship of Ti40 obeys parabolic rule. The varying range of xO is about 25% while p varies within 0.1-0.25 MPa. When xO is ≥70%, Ti40 is ignited immediately at room temperature and develops into continual and steady burning, and the duration of burning is more than 10 s. The fireproof performance of Ti40 is better than TC4 while xO of Ti40 is at least 40% higher than TC4. When xO is low, the fireproof performance of Ti40 is more sensitive to p; when xO increases, it is more sensitive to xO. The forming of fused oxides of V2O5, TiO2 and Cr2O3 with strong inner interaction during friction is the basic reason of high fireproof performance of Ti40.

 

Key words: Ti40 fireproof titanium alloys; fireproof performance; fused oxides; fireproof mechanism; titanium fire

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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