3Ni2組成的外層,Al3Ni2內層及富Al的互擴散層,Ce、Y元素主要集中在共滲層的外層,起到細化晶粒及促滲的作用。固體粒子沖蝕結果表明：Al-Ce-Y共滲顯著的提高了DZ125合金在小攻角下的抗固體粒子沖蝕性能,沖蝕機理為犁削和切削損傷；隨著攻角的增大,Al-Ce-Y共滲層的沖蝕率逐漸增大,沖蝕機理向脆性斷裂和疲勞破壞轉變,當攻角為90度時,其沖蝕率高于DZ125基體。"/>

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DZ125合金表面Ce-Y改性鋁化物滲層的組織及抗沖蝕性能
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北方民族大學 材料科學與工程學院,表面工程研究所 太原理工大學,北方民族大學 材料科學與工程學院,表面工程研究所 太原理工大學,北方民族大學 材料科學與工程學院,北方民族大學 材料科學與工程學院

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寧夏自然科學基金重點項目(NZ16083)


Microstructure and Solid Particle Erosion Behavior of Ce-Y jointly modified Aluminide Coatings Prepared on DZ125 alloy by Pack Cementation Process
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School of material science engineering,Beifang University of Nationalities,,School of material science engineering,Beifang University of Nationalities,,School of material science engineering,Beifang University of Nationalities,School of material science engineering,Beifang University of Nationalities

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    摘要:

    通過擴散滲法在DZ125合金表面制備了Ce-Y聯(lián)合改性鋁化物滲層,分析了共滲層的結構及相組成,并對其組織形成機理和抗沖蝕性能進行了研究。結果表明：1000℃/2h下所制備的Al-Ce-Y共滲層具有多層結構,由外向內依次為NiAl和少量Al3Ni2組成的外層,Al3Ni2內層及富Al的互擴散層,Ce、Y元素主要集中在共滲層的外層,起到細化晶粒及促滲的作用。固體粒子沖蝕結果表明：Al-Ce-Y共滲顯著的提高了DZ125合金在小攻角下的抗固體粒子沖蝕性能,沖蝕機理為犁削和切削損傷；隨著攻角的增大,Al-Ce-Y共滲層的沖蝕率逐漸增大,沖蝕機理向脆性斷裂和疲勞破壞轉變,當攻角為90度時,其沖蝕率高于DZ125基體。

    Abstract:

    Al and Y modified aluminide coatings were prepared by pack cementation process at 1000℃ for 2 h. The microstructure and constituent phases of the co-deposition coatings were studied, the formative mechanism and erosion behavior of the coating were also analysed. The results show that the coating prepared by co-depositing Al-Ce-Y at 1000℃ for 2 h have a multiple layer structure: an outer layer composed of NiAl and a little Al3Ni2 , a middle layer composed of Al3Ni2 and a Al-rich inter-diffusion zone. Y and Ce mainly existed in the outer layer, which plays the role of reducing the grain size and promoting permeation. The solid particle erosion resistance of DZ125 alloy with Al-Ce-Y coating was significantly increased at the small impact angle, and then the erosion rate of Al-Ce-Y coatings increased with the increasing of impact angles, and the erosion mechanism shift from plough and cutting damage to brittle fracture and fatigue failure. The erosion rate of Al-Ce-Y coating is higher than that of DZ125 matrix when the impact angle at 90°.

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李涌泉,唐賓,耿桂宏,林乃明,侯俊峰,秦春. DZ125合金表面Ce-Y改性鋁化物滲層的組織及抗沖蝕性能[J].稀有金屬材料與工程,2017,46(11):3388~3393.[Li Yongquan, Tang Bin, Geng Guihong, Lin Naiming, Hou Junfeng, Qin Chun. Microstructure and Solid Particle Erosion Behavior of Ce-Y jointly modified Aluminide Coatings Prepared on DZ125 alloy by Pack Cementation Process[J]. Rare Metal Materials and Engineering,2017,46(11):3388~3393.]
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  • 收稿日期:2016-09-09
  • 最后修改日期:2016-11-18
  • 錄用日期:2016-12-07
  • 在線發(fā)布日期: 2017-12-13
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