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| 1 | Improvement of Coercivity and Corrosion Resistance of Nd-Fe-B Sintered Magnets with Cu Nano-particles Doping显示文摘Nd-Fe-B permanent magnets with a small amount of Cu nano-particles doping have been prepared by conventional sintered method.Effects of Cu content on magnetic properties,corrosion resistance,and oxidation properties of the magnets have been studied.It shows that the coercivity rises gradually,while the remanence decreases simultaneously with increasing Cu doping amount.Microstructure observation reveals that Cu element enriches mainly the Nd-rich phase.Autoclave test results show that the corrosion rate of the magnets decreases with increasing Cu content.After oxidation,the maximum energy product loss of the magnets with 0 and 0.2 wt% Cu nano-particles doping are 6.13% and 0.99%,respectively.Therefore,it is concluded that Cu nano-particles doping is a promising way to enhance the coercivity and corrosion resistance of sintered Nd-Fe-B magnets. | C.Sun W.Q.Liu H.Sun M.Yue X.F.Yi J.W.Chen | 2012 | Journal of Materials Science & Technology2012，28，10： | 7 |
| 2 | Effect of Nitrogen Content on Microstructures and Mechanical Properties of WB_2(N) Films Deposited by Reactive Magnetron Sputtering显示文摘In the present study,WB_2(N) films are fabricated on silicon and YG8 substrates at different N_2 pressures by reactive magnetron sputtering.The influence of N_2 partial pressure(P_(N2)) on the film microstructure and characteristics is studied systematically,including the chemical composition,crystalline structure,residual stress,surface roughness as well as the surface and the cross-section morphology.Meanwhile,nano-indentation and ball-on-disk tribometer are performed to analyze the mechanical and tribological properties of the films.The results show that the addition of nitrogen apparently leads to the change of the structure from(1 0 1) to(0 0 1) orientation then to the amorphous structure with the formation of BN phase.And the addition of nitrogen can greatly refine the grain size and microstructure of the films.Furthermore,the residual stress of the film is also found to change from tensile to compressive stress as a function of P_(N2),and the compressive stress increases with P_(N2),The WB_2(N) films with small nitrogen content,which are deposited at P_(N2) of 0.004 and 0.006 Pa,exhibit better mechanical,tribological and corrosion properties than those of other films.Further increase of nitrogen content accelerates the formation of BN phase and fast decreases the film hardness.In addition,the large N_2 partial pressure gives rise to the target poisoning accompanied by the increase of the target voltage and the decrease of the deposition rate. | Y.M.Liu D.Y.Deng H.Lei Z.L.Pei C.L.Jiang C.Sun J.Gong | 2015 | Journal of Materials Science & Technology2015，31，12： | 5 |
| 3 | Oxidation,Mechanical and Tribological Behaviors of the Ni/cBN Abrasive Coating-Coated Titanium Alloys显示文摘In order to improve the oxidation and wear resistance of blades tip of titanium alloys as well as the sealing performance of the gas turbine engine,a Ni/cBN abrasive coating was prepared on titanium alloys through composite electroplating.Oxidation,mechanical and tribological properties of the abrasive coating were investigated.Furthermore,the effect of the oxidation on the mechanical and tribological properties was also evaluated.Oxidation results revealed that the abrasive coating underwent slight oxidation within 700℃.Meanwhile,some intermetallic compounds,Ni3Ti,NiTi and NiTi2,were formed at the coating/substrate interface during oxidation.Due to the pinning effect of cBN particles and the different thermal expansion coefficients of the coating and substrate,the coating/substrate interface was cracked after oxidation at 700℃.Tensile results showed that the presence of coating reduced the strength of the alloy significantly at room temperature,while only marginal variations of the strength of the coated and uncoated specimens at elevated temperatures.Besides,the wear tests indicated that the coating had the excellent cutting ability and wear resistance,which can effectively protect the blades tip of titanium alloys.As the temperature increased,the wear resistance decreased due to the decrease in the mechanical properties of the Ni/cBN coating. | Y.D.Liu J.H.Liu W.S.Gu H.L.Li W.H.Li Z.L.Pei J.Gong C.Sun | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，7： | 4 |
| 4 | High Temperature‐induced Changes in High Molecular Weight Glutenin Subunits of Chinese Winter Wheat and its Influences on the Texture of Chinese Noodles显示文摘 | Z.Deng J.Tian L.Zhao Y.Zhang C.Sun | 2008 | Journal of Agronomy and Crop Science2008，，4： | 1 |
| 5 | High Temperature‐induced Changes in High Molecular Weight Glutenin Subunits of Chinese Winter Wheat and its Influences on the Texture of Chinese Noodles显示文摘 | Z.Deng J.Tian L.Zhao Y.Zhang C.Sun | 2008 | Journal of Agronomy and Crop Science2008，，4： | 1 |
| 6 | Structure,mechanical and sliding wear properties of WC-Co/MoS2-Ni coatings by detonation gun spray显示文摘 | H.Du C.Sun W.G.Hua T.G.Wang J.Gong X.Jiang and S.W.Lee | | 0，，： | 1 |
| 7 | Hot Corrosion Behavior of Hf-Doped NiAl Coating in the Mixed Salt of Na_(2)SO_(4)+K_(2)SO_(4)at 900℃显示文摘The hot corrosion behavior of the NiAl coating and the 5Hf-NiAl coating induced by mixed salt at 900℃was investigated.Comparing with the NiAl coating,the 5Hf-NiAl coating exhibited superior hot corrosion resistance because the addition of Hf promoted the formation of protective oxide scale and reduced the growth rate of oxide scale.Therefore,internal sulfides were not present in the 5Hf-NiAl coating after hot corrosion for 140 h.Cr exhibited different distribution in the two coatings since the addition of Hf changed the hot corrosion process of the coating.Hf and Ti in the 5Hf-NiAl coating trapped and captured sulfur,preventing the penetration of sulfur into the coating.The hot corrosion mechanism of the two coating and the effects of Hf on this process were discussed in this work. | W.L.Zhang W.Li L.B.Fu X.Peng J.Sun S.M.Jiang J.Gong C.Sun | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，9： | 0 |
| 8 | STRUCTURE, MECHANICAL PROPERTIES AND THERMAL STABILITY OF DIAMOND-LIKE CARBON FILMS PREPARED BY ARC ION PLATING显示文摘Diamond-like Carbon (DLC) films have been prepared on Si(100) substrates by arc ion plating in conjunction with pulse bias voltage under H2 atmosphere. The depo sited films have been characterized by scanning electron microscopy and atomic f orce microscopy. The results show that the surface of the film is smooth and den se without any cracks, and the surface roughness is low. The bonding characteris tic of the films has been studied by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. It shows the sp3 bond content of the film deposited at -200V is 26.7%. The hardness and elastic modulus of the film determined by nanoindent ation technique are 30.8 and 250.1GPa, respectively. The tribological characteri stic of the films reveals that they have low friction coefficient and good wear- resistance. After deposition, the films have been annealed in the range of 350-7 00℃ for 1h in vacuum to investigate the thermal stability. Raman spectra indica te that the ID/IG ratio and G peak position have few detectable changes below 50 0℃. Further increasing the annealing temperature, the hydrogen can be released, the structure rearranges, and the phase transition of sp3 configured carbon to sp2 configured carbon appears. | Y.S.Zou J.D.Zheng J.Gong C.Sun R.F.Huang L.S.Wen | 2005 | Acta Metallurgica Sinica(English Letters)2005，18，3： | 0 |
| 9 | THE BAND STRUCTURE AND WORK FUNCTION OF TRANSPARENT CONDUCTING ALUMINUM AND MANGANESE CO-DOPED ZINC OXIDE FILMS显示文摘Al and Mn co-doped-ZnO films have been prepared at room temperature by DC reacti ve magnetron sputtering technique. The optical absorption coefficient, apparent and fundamental band gap, and work function of the films have been investigated using optical spectroscopy, band structure analyses and ultraviolet photoelectro n spectroscopy (UPS). ZnO films have direct allowed transition band structure, w hich has been confirmed by the character of the optical absorption coefficient. The apparent band gap has been found directly proportional to N2/3, showing that the effect of Burstein-Moss shift on the band gap variations dominates over the many-body effect. With only standard cleaning protocols, the work function of ZnO: (Al, Mn) and ZnO: Al films have been measured to be 4.26 and 4.21eV, respec tively. The incorporation of Mn element into the matrix of ZnO, as a relatively deep donor, can remove some electrons from the conduction band and deplete the d ensity of occupied states at the Fermi energy, which causes a loss in measured p hotoemission intensity and an increase in the surface work function. Based on th e band gap and work function results, the energy band diagram of the ZnO: (Al, M n) film near its surface is also given. | H.T.Cao Z.L.Pei X.B.Zhang J.Gong C.Sun L.S.Wen | 2005 | Acta Metallurgica Sinica(English Letters)2005，18，3： | 0 |
| 10 | Microstructural evolution and mechanical properties of NiCrAlYSi+NiAl/cBN abrasive coating coated superalloy during cyclic oxidation显示文摘Cyclic oxidation behavior of Ni Cr Al YSi+Ni Al/c BN abrasive coating at 900°C and the mechanical properties of the coating-substrate system were investigated.Results indicated that elemental interdiffusion occurred between the coating and substrate,which caused the formation of interdiffusion zone(IDZ)and secondary reaction zone(SRZ)during aluminization,while their compositions and structures changed with oxidation.Al N interfacial layer formed at c BN/metallic matrix interface during aluminization,while it transformed into multilayer oxides during oxidation.Due to the microstructural evolution of these interfaces,the fracture behavior and bending toughness of the system changed greatly during three-point bending tests.Besides,the damage mechanisms were discussed. | Y.D.Liu J.Sun W.Li W.S.Gu Z.L.Pei J.Gong C.Sun | 2021 | Journal of Materials Science & Technology2021，，12： | 0 |
| 11 | Formation process and oxidation behavior of MCrAlY+AlSiY composite coatings on a Ni-based superalloy显示文摘An AlSiY coating and two MCrAlY+AlSiY composite coatings with different thickness of MCrAlY interlayer were prepared by arc ion plating(AIP)and vacuum annealing.The isothermal oxidation behavior of coatings at 1100℃ for 300 h was also investigated to characterize the microstructure evolution of coatings during annealing.The composite coatings exhibited a better high-temperature oxidation resistance at 1100℃ .The reason is that the addition of MCrAlY layer can greatly contribute to prevent the diffusion of refractory elements to the outer layer.The inhibition of Al inward diffusion can be much stronger,as the Si content increases in the outer layer during annealing. | S.M.Li L.B.Fu W.L.Zhang W.Li J.Sun T.G.Wang S.M.Jiang J.Gong C.Sun | 2022 | Journal of Materials Science & Technology2022，，25： | 0 |
| 12 | Oxidation Performance and Interdiffusion Behaviour of two MCrAlY Coatings on a Fourth-Generation Single-Crystal Superalloy显示文摘The oxidation behaviour of a fourth-generation single-crystal superalloy without coating and with two types of MCrAlY coatings at 1140℃was studied.The results showed that both coatings greatly improved the oxidation resistance of the superalloy,and the addition of Hf further improved the oxidation resistance by pinning the oxide layer into the coating.Before and after oxidation,obvious Cr and Al interdiffusion was detected.Inward Cr diffusion induces the precipitation of a topologically close-packed phase,while the diffusion of Al affects the structure of theγ/γ’phase,the solubility of refractory elements,and the formation of an interdiffusion zone. | K.J.Tan J.J.Liang X.G.Wang X.P.Tao J.Gong C.Sun Y.Z.Zhou X.F.Sun | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，4： | 0 |
| 13 | Microstructure and Properties of WB_(2)/Cr Multilayer Films with Different Bilayer Numbers Deposited by Magnetron Sputtering显示文摘The influence of the bilayer number on the microstructure,mechanical properties,adhesion strength and tribological behaviors of the WB_(2)/Cr multilayer films was systematically investigated in the present study.Five groups of WB_(2)/Cr films with the same modulation ratio were synthesized by magnetron sputtering technique.The crystalline structure of the films was determined by X-ray diffraction.The morphologies and the microstructure of the films were observed by scanning electron microscopy,atomic force microscopy and transmission electron microscopy.Furthermore,Nano indenter,scratch tester and ball-on-disc tribometer were used to evaluate the mechanical and tribological properties.As bilayer numbers varied from 5 to 40,the hardness increased first and then decreased with the maximum hardness of 33.9 GPa when the bilayer number is 30.The H/E^(*)and H^(3)/E^(*2)values calculated to evaluate the fracture toughness showed the similar changing trend with hardness.The adhesion strength reached the maximum of 67 N when the bilayer number is 30.The surface roughness and friction coefficient decreased with increasing bilayer number.The wear mechanism was also investigated,and the results suggested that the multilayer film with bilayer number of 30 exhibited the best wear resistance(1.78×10^(–7)mm^(3)/Nm),benefiting from the contribution of high hardness,fracture toughness and adhesion strength. | W.B.Shi Y.M.Liu W.H.Li T.Li H.Lei J.Gong C.Sun | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，4： | 0 |
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