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high temperature oxidation treated 3D printed anatomical WE43 alloy scaffolds for repairing periarticular bone defects:In vitro and in vivo studies

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Bioactive Materials 2024年第2期32卷 177-189页

作者： Bingchuan Liu Jinge Liu Chaoxin Wang Zhengguang Wang Shuyuan Min Caimei Wang Yufeng Zheng Peng Wen Yun Tian Department of Orthopaedics Peking University Third HospitalBeijing100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing100191China The State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Beijing AKEC Medical Co. Ltd.Beijing102200China School of Materials Science and Engineering Peking UniversityBeijing100871China

Reconstruction of subarticular bone defects is an intractable challenge in *** simultaneous repair of cancellous defects,fractures,and cartilage damage is an ideal surgical outcome.3D printed porous anatomical WE43(magnesium with 4 wt%yttrium and 3 wt%rare earths)scaffolds have many advantages for repairing such bone defects,including good biocompatibility,appropriate mechanical strength,customizable shape and structure,and *** a previous investigation,we successfully enhanced the corrosion resistance of WE43 samples via high temperature oxidation(HTO).In the present study,we explored the feasibility and effectiveness of HTO-treated 3D printed porous anatomical WE43 scaffolds for repairing the cancellous bone defects accompanied by split fractures via in vitro and in vivo *** HTO treatment,a dense oxidation layer mainly composed of Y2O3 and Nd2O3 formed on the surface of *** addition,the majority of the grains were equiaxed,with an average grain size of 7.4μ*** and rabbit experiments confirmed the non-cytotoxicity and biocompatibility of the HTO-treated WE43 *** the implantation of scaffolds inside bone defects,their porous structures could be maintained for more than 12 weeks without penetration and for more than 6 weeks with *** the postoperative follow-up period for up to 48 weeks,radiographic examinations and histological analysis revealed that abundant bone gradually regenerated along with scaffold degradation,and stable osseointegration formed between new bone and scaffold *** images further demonstrated no evidence of any obvious damage to the cartilage,ligaments,or menisci,confirming the absence of traumatic ***,finite element analysis and biomechanical tests further verified that the scaffolds was conducive to a uniform mechanical *** conclusion,applying the HTO-treated 3D printed porous anatomical WE43 scaffolds exhibited favorable repa

关键词： Periarticular bone defects 3D printing technology Magnesium alloy high temperature oxidation Osseointegration

high temperature oxidation Resistance of 9Ni Steel

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Journal of Iron and Steel Research International 2014年第10期21卷 956-963页

作者： Yi-zhi LIU Cai-fu YANG Feng CHAI Tao PAN Hang SU Institute of Engineering Steel Central Iron and Steel Research Institute

oxidation rates and scale/steel interface configuration of 9Ni steels were investigated at 1000--1 250 ℃ in air. The results revealed that Cu addition caused high temperature oxidation resistance to deteriorate. high tempera ture oxidation rates increased and scale/steel interface configuration became complicated due to Cu addition. Scale/ steel interface appeared to be network above certain temperature. temperature required to form network scale/steel interface dropped more than 100 ℃ for 1.5% Cu-containing steel. （Fe,Ni,Cu）x Oy in inner oxidation layer dissocia ted to Fe-Ni-Cu phase and released active oxygen which can react with base steel easily. So the inner oxidation layer became the second source of oxidizing agent besides atmosphere. Internal stress at austenite grain boundary caused local oxide to fragment. So the scale/steel interface appeared to be network. Liquid Si-rich phase formed at sufficient ly high temperature. Penetration of the liquid Si-rich phase along austenite grain enhanced austenite grain oxidizing.

关键词： 9Ni steel high temperature oxidation scale/steel interface Thermo-Calc calculation

Effect of Si on high temperature oxidation of 30Cr13 stainless steel

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Journal of Iron and Steel Research International 2017年第5期24卷 561-568页

作者： Hong-huan Mao Xing Qi Jing Cao Li-cong An Yi-tao Yang School of Materials Science and Engineering Shanghai University Shanghai 200072 China

The effect of Si on the high temperature oxidation behavior of the 30Cr13 martensitic stainless steels was investigated. The underlying mechanism was further discussed by oxidation kinetics curves, scanning electron microscopy （SEM） and X-ray diffraction （XRD） analysis. It was ob- served that the addition of Si can significantly reduce the mass gain per unit area and the oxidation rate of the experimental steels. With the increase of Si content, the film surface composed of the wheat-like oxides turned into the small granular oxides after oxidation for 120 h. The SiO_2 film formed on the metal substrate inhibited the outward diffusion of the metal cation and the inward diffusion of the oxygen anion; thus, the high temperature oxidation resistance was enhanced.

关键词： Metallic material Martensitic stainless steel high temperature oxidation oxidation kinetics

Interfacial Behavior of Sulfur and Yttrium in Yttrium Modified Ni _3Al Based Alloy IC6 during high temperature oxidation Process

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Journal of Rare Earths 2000年第2期18卷 124-127页

作者：肖程波韩雅芳 Beijing Inst Aeronaut Mat Beijing 100095 Peoples R China

The interfacial behavior of sulfur and yttrium in the yttrium modified Ni 3Al based alloy IC6 during oxidation at 1100 ℃ was analyzed by X ray line scan of electron probe microstructural analysis(EPMA). The results show that the migration and segregation of sulfur to the interface between oxide scale and the substrate at high temperature is retarded owing to the presence of yttrium. This is attributed to the desulfurization by yttrium in the melt and the trapping of sulfur by yttrium rich phases during oxidation, which leads to improving the coherence between oxide scale and substrate. Another reason of increasing the high temperature oxidation resistance of alloy IC6 by the addition of yttrium is that yttrium migrates to the grain boundaries of oxides during oxidation and hence improve their strength. This results in the transformation of the oxide scale spallation cracks from intergranular cracks for alloy without yttrium to transgranular ones for yttrium modified alloy.

关键词： rare earths sulfur yttrium Ni 3Al high temperature oxidation interfacial behavior

high temperature oxidation behavior of Ti(Al,Si)_3 diffusion coating on γ-TiAl by cold spray

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Transactions of Nonferrous Metals Society of China 2016年第4期26卷 1155-1162页

作者：王吉强孔令艳李铁藩熊天英中国科学院金属研究所沈阳110016

A Ti(Al,Si)3 diffusion coating was prepared on γ-TiAl alloy by cold sprayed Al?20Si alloy coating, followed by a heat-treatment. The isothermal and cyclic oxidation tests were conducted at 900 °C for 1000 h and 120 cycles to check the oxidation resistance of the coating. The microstructure and phase transformation of the coating before and after the oxidation were studied by SEM, XRD and EPMA. The results indicate that the diffusion coating shows good oxidation resistance. The mass gain of the diffusion coating is only a quarter of that of bare alloy. After oxidation, the diffusion coating is degraded into three layers: an inner TiAl2 layer, a two-phase intermediate layer composed of a Ti(Al,Si)3 matrix and Si-rich precipitates, and a porous layer because of the inter-diffusion between the coating and substrate.

关键词： Ti(Al,Si)_3 diffusion coating γ-TiAl alloy cold spray heat-treatment high temperature oxidation

Improving corrosion resistance of additively manufactured WE43 magnesium alloy by high temperature oxidation for biodegradable applications

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Journal of Magnesium and Alloys 2024年第3期12卷 940-953页

作者： Jinge Liu Bangzhao Yin Fei Song Bingchuan Liu Bo Peng Peng Wen Yun Tian Yufeng Zheng Xiaolin Ma Caimei Wang State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Department of Orthopaedics Beijing Tsinghua Changgung HospitalInstitute for Precision MedicineTsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China School of Materials Science and Engineering Peking UniversityBeijing 100871China Beijing AKEC Medical Co. Ltd.Beijing 102200China

Laser powder bed fusion(L-PBF)has been employed to additively manufacture WE43 magnesium(Mg)alloy biodegradable implants,but WE43 L-PBF samples exhibit excessively rapid *** this work,dense WE43 L-PBF samples were built with the relativity density reaching 99.9%.high temperature oxidation was performed on the L-PBF samples in circulating air via various heating temperatures and holding *** oxidation and diffusion at the elevated temperature generated a gradient structure composed of an oxide layer at the surface,a transition layer in the middle and the *** oxide layer consisted of rare earth(RE)oxides,and became dense and thick with increasing the holding *** matrix was composed ofα-Mg,RE oxides and Mg_(24)RE_(5) *** precipitates almost disappeared in the transition *** passivation effect was observed in the samples treated by a suitable high temperature *** original L-PBF samples lost 40%weight after 3-day immersion in Hank’s solution,and broke into fragments after 7-day *** casted and solution treated samples lost roughly half of the weight after 28-day *** high temperature oxidation samples,which were heated at 525℃ for 8 h,kept the structural integrity,and lost only 6.88%weight after 28-day *** substantially improved corrosion resistance was contributed to the gradient structure at the *** one hand,the outmost dense layer of RE oxides isolated the corrosive medium;on the other hand,the transition layer considerably inhibited the corrosion owing to the lack of ***,high temperature oxidation provides an efficient,economic and safe approach to inhibit the corrosion of WE43 L-PBF samples,and has promising prospects for future clinical applications.

关键词： Laser powder bed fusion Biodegradable magnesium alloy high temperature oxidation Corrosion resistance WE43.

Influence of high temperature oxidation on mechanical properties and in vitro biocompatibility of WE43 magnesium alloy fabricated by laser powder bed fusion

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Journal of Materials Science & Technology 2024年第12期179卷 26-39页

作者： Jinge Liu Shuyuan Min Zijun Mao Mengran Zhou Bingchuan Liu Dazhi Liu Fei Song Peng Wen Yun Tian Yufeng Zheng The State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Institute for Precision Medicine Tsinghua University Beijing Tsinghua Changgung HospitalBeijing 102218China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China School of Materials Science and Engineering Peking UniversityBeijing 100871China Tangshan Weihao Magnesium Powder Co. Ltd.Qian'an 064406China

Laser powder bed fusion(L-PBF)has been used to fabricate biodegradable Mg implants of WE43 alloy,but the degradation is too fast compared with the term bone *** studies show that high temperature oxidation(HTO)can successfully inhibit the degradation of WE43 *** this work,the influence of HTO on L-PBF samples of WE43 alloy was investigated regarding tensile,compressive,and abrasive resistance,as well as in vitro cytotoxicity,cell proliferation,hemolysis,and *** with the as-built L-PBF samples,HTO increased grain size and grain texture,stabilized and coarsened precipitates,and caused discontinuous static recrystallization in the *** oxide layer at the surface of the HTO samples improved surface roughness,hydrophilia,hardness,and abrasive *** tensile strength decreased slightly from 292 to 265 MPa,while the elongation substantially increased from 10.97%to 16.58%after *** in vitro cell viability,cell proliferation,hemolysis,and osteogenic effect were considerably enhanced due to the improvement of surface quality and the initial inhibition of excessive Mg^(2+)***,HTO is of great benefit to the surface performance,ductility,and biocompatibility of WE43 alloy fabricated by L-PBF for biodegradable applications.

关键词： Additive manufacturing Biodegradable metal Magnesium alloy WE43 high temperature oxidation

high temperature oxidation behavior of directionally solidified NiAl-31Cr-2.9Mo-0.1Hf-0.05Ho eutectic alloy

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Transactions of Nonferrous Metals Society of China 2012年第7期22卷 1582-1587页

作者：王振生谢亿郭建亭周兰章胡壮麒张光业陈志钢湖南科技大学机电工程学院湘潭411201 中国科学院金属研究所沈阳110016 湖南省电力公司科学研究院长沙410007

The isothermal oxidation behavior of NiAl-31Cr-2.9Mo-0.1Hf-0.05Ho directional eutectic alloy was investigated with the help of scanning electron microscopy and X-ray *** results revealed that a continuous Al2O3 scale was formed and owned excellent oxidation resistance in the temperature range of 900-1100°*** the temperature was up to 1150°C,the continuous Al2O3 oxide film *** rare earth element Ho distributed uniformly in the alloy and relatively high level of Al in Cr（Mo）phase are beneficial to the formation of continuous and compact Al2O3 *** the oxidation,a phase transformation fromθ-Al2O3 toα-Al2O3 existed on the surface of oxidation *** resulted in the abnormal oxidation mass gain happening when the alloy was oxidized at 1000°C or 1050°C.

关键词： intermetallic compounds NiAl high temperature oxidation directional eutectic alloy

Effect of Rare Earth Doping on the Tensile Properties of high temperature oxidation Coating

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Journal of Wuhan University of Technology(Materials Science) 2023年第6期38卷 1449-1456页

作者： ZHANG Shilei LI Shuai ZHAO Yuncai WANG Ximao LIU Cunyu School of Mechanical and Electrical Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

The failure process was characterized by complex diffusion of elements in the bonding layer,TGO growth and growth stress inside the *** studied the aluminum migration phenomenon of NiCoCrAlY and NiCoCrAlYHf coatings under high temperature oxidation,TGO growth characteristics,the microstructure and composition of the bonding layer,and integrates them into the description of the surface strain under coating *** experimental results show that the TGO growth rate of NiCoCrAIYHf coating is lower than that of NiCoCrAIY coating,and the formed TGO is *** high temperature oxidation,the cracking time of NiCoCrAIY coating is advanced,while the cracking time of rare earth doped coating is *** addition of rare earth elements can effectively inhibit the generation of spinel phase,improve the fracture toughness of TGO,refine the grains in the bonding layer,and increase the grain boundary strengthening by 29.1 MPa which is consistent with the experimental ***,the yield strength of the doped coating is improved and the crack time of the coating is delayed.

关键词： thermal barrier coating NiCoCrAIYHf thermal growth oxides high temperature oxidation surfacecrack