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| 1 | A Review on Binderless Tungsten Carbide: Development and Application显示文摘WC-Co alloys have enjoyed great practical significance owing to their excellent properties during the past decades.Despite the advantages,however,recently there have been concerns about the challenges associated with the use of Co,i.e.price instability,toxicity and properties degeneration,which necessitates the fabrication of binderless tungsten carbide(BTC).On the other hand,BTC or BTC composites,none of them,to date has been commercialized and produced on an industrial scale,but only used to a limited extent for specialized applications,such as mechanical seals undergoing high burthen as well as high temperature electrical contacts.There are two challenges in developing BTC:fully densifying the sintered body together with achieving a high toughness.Thus,this review applies towards comprehensively summarize the current knowledge of sintering behavior,microstructure,and mechanical properties of BTC,highlighting the densification improving strategies as well as toughening methods,so as to provide reference for those who would like to enhance the performance of BTC with better reliability advancing them to further wide applications and prepare the material in a way that is environment friendly,harmless to human health and low in production cost.This paper shows that the fabrication of highly dense and high-performance BTC is economically and technically feasible.The properties of BTC can be tailored by judiciously selecting the chemical composition coupled with taking into careful account the effects of processing techniques and parameters. | Jialin Sun Jun Zhao Zhifu Huang Ke Yan Xuehui Shen Jiandong Xing Yimin Gao Yongxin Jian Hejie Yang Bo Li | 2020 | Nano-Micro Letters2020，12，1： | 8 |
| 2 | Degradation of differently processed Mg-based implants leads to distinct foreign body reactions(FBRs)through dissimilar signaling pathways显示文摘Mg alloys have mechanical properties compatible with human bones.However,their rapid degradation and associated foreign body reactions in vivo significantly limit their application for human implants.In this study,three differently processed Mg alloys,pure Mg(PM),cold extruded Mg alloy AZ31(CE AZ31),and fully annealed AZ31 Mg alloy(FA AZ31)were comparatively investigated for their potential as implants using a rat model.All three implanted Mg alloys do not show any impact on hepato-and renal function,nor any signs of observable changes to vital organs.Proteomics analysis of tissues directly contacting the implants 2.5 months post implantation revealed that FA AZ31 activates very few inflammation and immune associated signaling pathways;while the CE AZ31 and PM produce more significant inflammatory responses as confirmed by cytokine array analyses.Further,FA AZ31 activated pathways for cell organization and development that may improve the recovery of injured tissues.Structurally,EBSD analysis reveals that the FA AZ31 alloy has a higher ratio of first-order pyramidal orientated(10–11){10–1–2}grain texture with a value of 0.25,while PM and CE AZ31 alloys have lower ratios of first-order pyramidal orientated texture with the values of 0.16 and 0.17,respectively.This is associated with recovery and recrystallisation during annealing which promotes grain texture which exhibits enhanced degradation behaviours and induces a more limited immune response in vivo.In conclusion,the FA AZ31 demonstrated better biocompatibility and corrosion resistance and is a promising candidate for metal-based degradable implants which warrants further investigation. | Xiaosong Liu Guoqiang Chen Xiongxiong Zhong Tianfang Wang Xiaohong He Weipeng Yuan Pingping Zhang Ying Liu Dongming Cao Shu Chen Ken-ichi Manabe Zhengyi Jiang Tsuyoshi Furushima Damon Kent Yang Chen Guoying Ni Mingyong Gao Hejie Li | 2023 | Journal of Magnesium and Alloys2023，11，6： | 0 |
| 3 | Enhancing corrosion resistance of ZK60 magnesium alloys via Ca microalloying: The impact of nanoscale precipitates显示文摘Enhancing corrosion resistance of Mg-Zn alloys with high strength and low cost was critical for broadening their large-scale practical applications. Here we prepared solutionized, peak-and over-aged ZK60 alloys with and without microalloying Ca(0.26 wt.%) to explore the effects of nanoscale precipitates on their corrosion behavior in detail via experimental analyses and theoretical calculations. The results suggested the peak-aged ZK60 alloy with Ca addition showed improved corrosion resistance in comparison with the alloys without Ca,owing to the contribution of Ca on the refinement of precipitates and increase in their number density. Although the precipitates and Mg matrix formed micro-galvanic couples leading to dissolution, the fine and dense precipitates could generate “in-situ pinning” effect on the corrosion products, forming a spider-web-like structure and improving the corrosion inhibition ability accordingly. The pinning effect was closely related to the size and number density of precipitates. This study provided important insight into the design and development of advanced corrosion resistant Mg alloys. | Wei Fu Hejie Yang Tianshu Li Jiapeng Sun Shengwu Guo Daqing Fang Weichao Qin Xiangdong Ding Yimin Gao Jun Sun | 2023 | Journal of Magnesium and Alloys2023，11，9： | 0 |
| 4 | 3D printed porous titanium filled with mineralized UV-responsive chitosan hydrogel promotes cell proliferation and osteogenesis in vitro显示文摘The modification of 3D printed porous titanium(Ti),especially for the internal pore structure,is critical and has received more attention to promoting its osteogenesis for clinical use.Ultra-violet(UV)responsive chitosan(CSMA),as an injectable filling material,was firstly incorporated into porous Ti,and then CSMA was in-situ mineralized by carbon oxide(CO_(2))diffusion(CSMA/CaCO_(3)).Their physical-chemical and biological properties were investigated in vitro.CaCO_(3) crystals within CSMA hydrogels were successfully deposited into pores of porous Ti,which exhibited favorable biocompatibility.Ti implants filled with CSMA/CaCO_(3) promoted adhesion and proliferation of bone mesenchymal stem cells(BMSCs).Moreover,Ti implant filled CSMA/CaCO_(3) hydrogels could increase alkaline phosphatase(ALP)activities,up-regulate osteopontin(OPN)and osteocalcin(OCN)expression levels,and enhance extracellular mineralization.3D printed porous Ti filled with mineralized UV-responsive chitosan hydrogel could promote proliferation and osteogenesis of BMSCs,and have great potential for the modification of porous Ti implants in bone tissue engineering. | Jiazhao Yang Fan Liu Changshun Zhou Hejie Li Gaolin Yang Shiyuan Fang In-Seop Lee Yi Liu Hao Bai Cen Chen | 2023 | Journal of Materials Science & Technology2023，，11： | 0 |
| 5 | Relaxor ferroelectric properties of 85PZN–15BT transparent ceramic at low temperatures显示文摘Dielectric,hysteresis(P–E)loops and TSDC properties of transparent 85PZN–15BT ceramic over150–150℃ were investigated.The sample was found to exhibit a strong relaxor behavior and a relatively small remanent polarization.TSDC studies showed that there existed an electric field-dependent peak in the p versus T.Such interesting features were attributed to the electric field-induced transition and coexistence of polar nanoregion,long-range ordered polar region and nonpolarizable BZN-rich region. | Lizhu Huang Wei Zhao Wei Ruan Heji Yang Jiangtao Zeng Guorong Li | 2013 | Journal of Advanced Dielectrics2013，3，3： | 0 |
| 6 | Partial portacaval shunt with H-grafts to treat portal hypertension显示文摘Partial portosystemic shunts have been popularized because of a reported low rate of mortality and morbidity(especially encephalopathy,liver failure and occlusion).The results of partial portacaval shunts[small-diameter expanded polytetrafluoroethylene(ePTFE)H-graft portacaval shunt]were retrospectively reviewed to evaluate the clinical efficacy in the treatment of portal hypertension.Forty-three patients with portal hypertension were treated by small-diameter H-graft of ePTFE portacaval shunt from May 1995 to April 2006.Thirty-three had externally ringed grafts and ten had non-ringed ones.Ten had grafts of 10 mm in diameter and 33 had grafts of 8 mm.The left gastric artery and coronary vein were ligated in all the cases.Six had pericardial devascularization and splenectomy was performed in 42.An average decrease of free portal pressure(FPP)from(33.24 P4.78)cmH2O before shunting and(13.65P5.65)cmH2O after shunting was observed.The portal blood flow was reduced by one-third of that before shunt.Thirty-eight patients survived and no upper gastro-intestinal rebleeding occurred in the follow-up period(50.5 months in average).Two were out of contact.Color Doppler ultrasonography and/or portography revealed the shunts were patent in 38 cases and were occluded in three cases(3/41,7.3%).Encephalopathy developed in five cases(5/41,12.2%).Partial(small-diameter ePTFE H-graft)portacaval shunting can reduce the portal pressure effectively.Majority of the hepatic flow from the portal vein can be maintained adequately.The shunts with reinforced grafts can keep a higher rate of patency.The morbidity of encephalopathy was lower than those with total shunt.The partial portacaval shunt is effective in preventing recurrent variceal bleeding. | XU Geliang HU Hejie LI Jiansheng YANG Shugao CHAI Zhongpei XU Rongnan | 2007 | Frontiers of Medicine2007，1，3： | 0 |
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