<em>w</em>(Co)/<em>w</em>(Ni)对Ti(C,N)基金属陶瓷高温氧化和耐腐蚀性能的影响

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Abstract The effects of Co and Ni binder ratio on microstructure and properties in Ti(C,N) based cermets has been studied. The corrosion behaviors of cermets in high temperature and acid solution have been analyzed systematically. The results indicate that cermet with w(Co)/w(Ni) ratio of 1 has excellent mechanical properties, which TRS and hardness are 1 749 MPa and 93.8 (HRA), respectively. The corrosion resistant of cermets in H₂SO₄ acid solution increases obviously with adding Ni into binder phase, whereas the mass loss of T3 cermet with w(Co)/w(Ni) ratio of 1 is 0.074 5% after immersion for 120 h. The corrosion mechanisms of cermets in acid solution are the dissolution of binder phase and partly rim phases. The passive regions in anodic polarization curves appear combination with the decrease of w(Co)/w(Ni) ratio, which is proved that the increase of Ni content can promote the solid solution of the elements to the binder phase. The T3 cermet has excellent corrosion resistance, and the self corrosion current density is 3.356 6×10^-7A/cm². Finally, after oxidized in static air for 10 h under 900 ℃, the mass losses of all cermets with surface area of 2.5 cm² are lower than 1mg. Moreover, the corrosion behaviors of cermets in high temperature are the prior oxidation of binder phase and the oxidation of Ti, W-riched solid solution phases.

Key words： w(Co)/w(Ni) Ti(C,N) based cermet immersion corrosion electrochemical corrosion high-temperature oxidation

Received: 20 April 2018 Published: 12 July 2019

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	LIU Yi
	ZHANG Meimei
	KANG Xiyue
	LIN Nan
	YAN Yan
	QIU Song
	HUANG Jianhua
	HE Yuehui

Cite this article:

LIU Yi,ZHANG Meimei,KANG Xiyue, et al. Effects of w(Co)/w(Ni) ratio on high-temperature oxidation and corrosion resistant behavior in Ti(C,N)-based cermets[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(1): 27-36.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I1/27

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