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oxidation resistance AND MECHANICAL PROPERTIES OF Ti_3Al-Nb-Mo-Si ALLOYS

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 577-582页

作者： SUN Yufeng CAO Chunxiao CAO Jingxia YAN Minggao (Beijing Institute of Aeronautical Materials,Beijing,100095),P.R.China Beijing Inst of Aeronautical Materials Beijing China

In the present paper,the development of Ti3Al-Nb-Mo-Si alloys for high oxidation resistance is *** of weight gain of alloys with different Nb and Si addition is tested,the evaluation of comprehensive mechanical properties has been taken,include the room-temperature and 700℃ tensile properties,thermal stability,creep rupture and fracture toughness of the alloys,It has shown that the oxidation resistance and mechanical properties were significantly affected by the variation of Nb and Si *** composition with the best balance of properties is Ti-24Al-13Nb-1.5Mo-0.5Si and Ti-24Al-15Nb-1.5Mo,which is mush higher than that of Super,α_2 alloy (Ti-25Al-10Nb-3V-1Mo).

关键词： Ti_3Al alloy oxidation resistance mechanical properties

Effect of Ce+ Ion Implantation upon oxidation resistance of Superalloy K38G

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Journal of Rare Earths 2005年第1期23卷 63-67+3页

作者：钱余海,李美栓,多树旺,赵有明 Technology Center Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China Shenyang National (Laboratory) for Materials Sciences Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Shenyang National (Laboratory) for Materials Sciences Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Jiangsu Electric Power No.3 Construction Engineering Company Zhenjiang 212000 China

The oxidation behavior （isothermal and cyclic oxidation） of cast superalloy K38G and the effect of Ce+ion implantation with dose of 1×1017ions/cm2upon its oxidation resistance at 900 and 1000 ℃ in air were investigated. Meanwhile, the influence of Ce+implantation on oxidation behavior of K38G with pre-oxide scale at 1000 ℃ in air was compared. The pre-oxidation was performed at 1000 ℃ in static air for 0.25 and 1.5 h, respectively. It is shown that the homogeneous external mixture oxide of rutile TiO2+Cr2O3and non-continuous internal oxide of Al2O3are formed during the oxidation procedure in all the cases. The isothermal oxidation resistance and the cracking or spallation resistance of superalloy K38G implanted with Ce+by both of the two different implantation ways are not improved notably. This may be attributed to the mixed oxide composition characteristics and the blocking effect differences of Ce+segregation along the oxide grain boundaries on the transport process for different diffusing ions.

关键词： high temperature oxidation oxidation resistance ion implantation superalloy K38G rare earths

Fabrication and oxidation resistance of silicon nitride fiber reinforced silica matrix wave-transparent composites

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Journal of Materials Science & Technology 2019年第12期35卷 2761-2766页

作者： Xuejin Yang Bin Li Duan Li Changwei Shao Changrui Zhang Chunrong Zou Kun Liu Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense TechnologyChangsha 410073China School of Materials Sun Yat-sen UniversityGuangzhou 510275China Advance Interdisciplinary Technology Research Center Academy of Military ScienceBeijing 100010China Beijing Institute of Special Electromechanical Technology Beijing 100012China

Wave-transparent ceramic matrix composites for the high temperature use should possess excellent oxidation resistance. In this work, Si3N4f/SiO2 composites with different fiber content were fabricated by filament winding and sol gel method. The oxidation resistance was investigated by tracking the response of flexural strength to the testing temperature. The results show that the flexural strength and toughness of the composites with fiber content of over 37% can reach high levels at around 175.0 MPa and 6.2 MPa m^1/2, respectively. After 1 h oxidation at 1100℃, the flexural strength drops a lot but can still reach 114.4 MPa, which is high enough to ensure the safety of structures. However, when the oxidation temperature rises to 1200–1400℃, the flexural strengths continue to fall to a relatively low level at 50.0–66.4 MPa. The degradation at high temperatures is caused by the combination of over strong interfacial bonding, the damage of fiber and the crystallization of silica matrix.

关键词： Si3N4f/SiO2 Fiber content oxidation resistance Mechanical property

Effects of Alloy Elements on oxidation resistance and Stress-Rupture Property of P92 Steel

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Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 129-138页

作者： Gang Liu Yu-Lai Xu Cai-Xiong Yang Xue-Shan Xiao Xi-Min Chen Xiao-Ke Zhang Xiang-Jun Meng Laboratory for Microstructures Institute of Materials Shanghai University Baosteel Special Materials Co. Ltd

Effects of alloy elements Cr, W, Ce, and Si on oxidation behavior at 750℃ in air and stress-rupture properties of P92 steel have been investigated. The proper increase in elements Cr, W, and Ce improved to varying degrees both oxidation resistance by either facilitating more protective Cr2O3 or modifying surface morphologies and stress-rupture life largely attributed to the formation of fine Laves phase. The excessive addition of Si significantly improved oxidation resistance of P92 steel, but dramatically impaired the stress-rupture life due to the formation and coarsening of Laves phase. The results indicate that proper additions of Cr, W, and Ce are beneficial for the comprehensive property of P92 steel.

关键词： P92 oxidation resistance Stress-rupture property Microstructure

Enhanced oxidation resistance of low-carbon MgO-C refractories with ternary carbides:a review

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Journal of Iron and Steel Research International 2022年第7期29卷 1052-1062页

作者： Chao Yu Bo Dong Yu-feng Chen Bei-yue Ma Jun Ding Cheng-ji Deng Hong-xi Zhu Jing-hui Di The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The demand for low-carbon MgO–C refractories is ever growing to meet the development of advanced steelmaking technologies and efficient energy ***,to improve the oxidation resistance and inhibit the weakness of low-carbon MgO–C refractories,antioxidants are *** application of ternary carbides that focused on improving the oxidation performance of MgO–C refractories has been explored,and the ternary carbides including Al_(4)O_(4)C,Al8B_(4)C_(7),Al_(4)SiC_(4),Ti_(2)AlC,Ti_(3)AlC_(2),and Ti_(3)SiC_(2)have been proved *** crystal structure,physical properties,oxidation behavior,and synthesis of these ternary carbides were summarized,and their oxidation mechanism in assisting antioxidation of MgO–C refractories was *** addition,the potential aspects related to the usage and development of ternary carbides in low-carbon MgO–C refractories were proposed.

关键词： Low-carbon MgO–C refractory Ternary carbide MAX phase oxidation mechanism oxidation resistance

Superior synergistic oxidation resistance of medium-entropy carbide ceramic powders rather than multi-phase carbide ceramic powders

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Journal of Advanced Ceramics 2024年第8期13卷 1223-1233页

作者： Jiachen Li Fanyu Lu Tao Li Yanqin Fu Junhao Zhao Junshuai Lv Yulei Zhang Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi'an 710072China

To date,some questions about medium-entropy carbide ceramics and the corresponding multi-phase carbide ceramics with the same cations and proportions remain *** oxidation behavior,do both have synergistic oxidation abilities and what role does entropy stabilization play in medium-entropy carbides?In this work,the oxidation behaviors of HfC-ZrC-TiC multi-phase carbide(HZT-MPC)and(Hf_(1/3)Zr_(1/3)Ti_(1/3))C medium-entropy carbide(HZT-MEC)powders were *** thermogravimetry(TG)oxidation,the TG curve of HZT-MPC had a bimodal ***"preferential oxidation"of HfC/ZrC occurred within HZT-MPC,followed by the formation of multi-phase oxides(HfO_(2),ZrO_(2),and TiO_(2)).The uneven compositional distribution slowed their solid solution reactions to form Ti-doped(Hf,Zr)O_(2) and(Hf,Zr)TiO_(4).The TG curve of HZT-MEC had a single peak.A uniform compositional distribution at the atomic scale promoted the rapid interdiffusion of oxides,forming Ti-doped(Hf,Zr)O_(2) and(Hf,Zr)TiO_(4) without ZrO_(2),HfO_(2),and TiO_(2) after TG ***,HZT-MEC had a higher onset oxidation temperature(To;470℃)than did HZT-MPC(430℃),and the TG single peak of HZT-MEC was between the TG bimodal peaks of ***,HZT-MEC showed superior oxidation resistance compared to HZT-MPC,which was attributed to the entropy stabilization effect of HZT-MEC suppressing the"preferential oxidation"of HfC/ZrC and the"delayed oxidation"of TiC,promoting the synergistic oxidation ability of multiple principal elements.

关键词： medium-entropy carbide multi-phase carbide synergistic oxidation ability oxidation resistance

Influences of Iridium and Palladium on oxidation resistance of PtAl Coating

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Acta Metallurgica Sinica(English Letters) 2021年第8期34卷 1120-1130页

作者： Ling-Yi Qian Jing Wang Yun-Shan Guo He Liu Ze-Bin Bao AECC Commercial Aircraft Engine Co. LtdShanghai 201108China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The overarching goal of present study is to investigate the effects of Ir and Pd additions on the oxidation behaviour of PtAl coatings. Prior to depositing standard PtAl coating, Ir layer was electroplated by IrBr 3 aqueous solution while Pd layer was prepared using electroless deposition. Comparing with normal PtAl coating, cyclic oxidation tests were carried out on both the Ir-and Pd-modified aluminide coatings. The results showed that Ir-modified PtAl coating exhibited better oxidation resistance than both Pd-modified and normal PtAl coatings because Ir partly served as diffusion barrier to reserve Al while Pd did not.

关键词： Thermal barrier coating PtAl coating oxidation resistance Iridium Palladium

Influence of Nb Ion Im plantation on oxidation resistance of High Tem perature Titaniu m Alloy at 650 ℃

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Rare Metals 1999年第3期18卷 161-166页

作者：惠松骁张翥萧今声袁冠森 GeneralResearchInstituteforNonferrousMetals

The oxidation rate of a high temperature titanium alloy in air at 650℃ could be decreased significantly by means of ion implantation of 3×10 16 and 3×10 17 ions/cm 2 Nb. The microstructure and alloy elements distribution in the oxidation scale of unimplanted and Nb implanted titanium alloy were investigated by using SEM, XRD and AES. The addition of Nb could reduce the number of point defects and decrease the solubility of oxygen in the alloy substrate. Therefore, the oxidation resistance of the alloy in air at 650℃ is remarkably improved.

关键词： High temperature titanium alloy oxidation resistance Ion implantation

Effect of Cerium on Microstructures and High Temperature oxidation resistance of An Nb-Si System In-Situ Composite

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Journal of Rare Earths 2007年第4期25卷 474-479页

作者：刘爱勤孙璐李树索韩雅芳 School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics

Nb-16Si-24Ti-6Cr-6A1-2Hf-xCe （x =0, 0.05, 0.1,02.5, 0.5, 1 （%, atom fraction）） in situ composites were prepared by arc melting The microstmcture and the effect of rare earth element cerium on 1250℃ oxidation resistance of the composites were investigated with scanning electron microscopy （SEM） and X-ray energy disperse spectrum （EDS）, as well as X-ray diffraction （XRD）. The experimental results showed that the high temperature oxidation resistance of the alloy was improved by adding a proper amount of cerium （Ce）. The effect of Ce was considered as the concurrent of the following three factors： first, the oxide of Ce formed in the interface reduced the internal oxidation rate; second, the lath shaped oxide containing Ce increased the cracking resistance and reduced the expansion of the oxide scale; and third, the decrease of the sificide volume fraction on account of Ce addition reduces the power of the sample resisting oxygen penetration.

关键词： oxidation resistance in-situ composite Nb-Si alloy rare earths