In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow discharges.In 2019,a new Impurity Powder Dropper(IPD)system was installed and is unde...In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow discharges.In 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning technique.In the LHD,which is a large-sized heliotron device,an additional helium(He)glow discharge cleaning(GDC)after boronization was operated for a reduction in hydrogen recycling from the coated boron layers.This operational time of 3 h was determined by spectroscopic data during glow discharges.A flat hydrogen profile is obtained on the top surface of the coated boron on the specimen exposed to boronization.The results suggest a reduction in hydrogen at the top surface by He-GDC.Trapped oxygen in coated boron was obtained by boronization,and the coated boron,which has boron-oxide,on the first wall by B-IPD was also shown.Considering the difference in coating areas between B2H6 boronization and B-IPD operation,it would be most effective to use the IPD and B2H6 boronization coating together for optimized wall conditioning.展开更多
1.IntroductionBoronizing can evidently increase thesurface hardness and wear resistance of me-tallic materials[1].It is simple in technique,not expensive and widely used on tools,diesand some other parts which are eas...1.IntroductionBoronizing can evidently increase thesurface hardness and wear resistance of me-tallic materials[1].It is simple in technique,not expensive and widely used on tools,diesand some other parts which are easy towear.However the wear mechanism andbehaviour of boronized layer are not clearwhen abraded by mixed abradants such ascoal,hard mineral etc.[2,3].Several metallic materials commonly展开更多
The paper reports the deposition（by magnetron sputtering） and properties of polycrystalline boron nitride （BN） layers on commercial inoculating alloy wires. As is characterized by means of Fourier transform infra...The paper reports the deposition（by magnetron sputtering） and properties of polycrystalline boron nitride （BN） layers on commercial inoculating alloy wires. As is characterized by means of Fourier transform infrared（FTIR） spectroscopy, electron energy dispersive X-ray（EDX） spectroscopy and scanning electron microscopy（SEM）, the thin BN layers consist of hexagonal and orthorhombic BN phases and are smooth without cracks. Organism transfer- ring-circles experiments reveal that the adhesion between the BN layer and alloy wire is very good after tens of cycles. It is demonstrated that the BN layers covered wires are biomaterial lubricious and self-cleaning. As a result, BN layer would effectively enhance the function and efficiency of inoculating alloy wires, which could be widely ap- plied to bio-experimentation and biomedicine apparatuses.展开更多
基金supported by NIFS budgets,KOBF031,ULFF004,KUHR032partly supported by JSPS KAKENHI 18K04999+2 种基金JSPS-CAS Bilateral Joint Research Projects,“Control of wall recycling on metallic plasma-facing materials in fusion reactor”2019-2022,(No.GJHZ201984)the Chinese Academy of Sciences President’s International Fellowship Initiative Grant No.2024VMB0003 in FY2023the U.S.Department Of Energy under Contract No.DE-AC02-09CH11466 with Princeton University。
文摘In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow discharges.In 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning technique.In the LHD,which is a large-sized heliotron device,an additional helium(He)glow discharge cleaning(GDC)after boronization was operated for a reduction in hydrogen recycling from the coated boron layers.This operational time of 3 h was determined by spectroscopic data during glow discharges.A flat hydrogen profile is obtained on the top surface of the coated boron on the specimen exposed to boronization.The results suggest a reduction in hydrogen at the top surface by He-GDC.Trapped oxygen in coated boron was obtained by boronization,and the coated boron,which has boron-oxide,on the first wall by B-IPD was also shown.Considering the difference in coating areas between B2H6 boronization and B-IPD operation,it would be most effective to use the IPD and B2H6 boronization coating together for optimized wall conditioning.
文摘1.IntroductionBoronizing can evidently increase thesurface hardness and wear resistance of me-tallic materials[1].It is simple in technique,not expensive and widely used on tools,diesand some other parts which are easy towear.However the wear mechanism andbehaviour of boronized layer are not clearwhen abraded by mixed abradants such ascoal,hard mineral etc.[2,3].Several metallic materials commonly
基金Supported by the National Natural Science Foundation of China（Nos.51072066, 50772041）, the Specialized Research Fund for the Doctoral Program of Higher Education of China（No.20100061110083） and the New Century Excellent Talents in Univer- sities of China（No.NCET-06-0303）.
文摘The paper reports the deposition（by magnetron sputtering） and properties of polycrystalline boron nitride （BN） layers on commercial inoculating alloy wires. As is characterized by means of Fourier transform infrared（FTIR） spectroscopy, electron energy dispersive X-ray（EDX） spectroscopy and scanning electron microscopy（SEM）, the thin BN layers consist of hexagonal and orthorhombic BN phases and are smooth without cracks. Organism transfer- ring-circles experiments reveal that the adhesion between the BN layer and alloy wire is very good after tens of cycles. It is demonstrated that the BN layers covered wires are biomaterial lubricious and self-cleaning. As a result, BN layer would effectively enhance the function and efficiency of inoculating alloy wires, which could be widely ap- plied to bio-experimentation and biomedicine apparatuses.
