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H13钢表面激光熔覆NiFeBSi-Si_3N_4合金的组织及腐蚀性能 被引量:10
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作者 张春华 张松 +1 位作者 张宁 H.C.Man 《金属热处理》 CAS CSCD 北大核心 2006年第9期49-51,共3页
利用连续波CO2激光器分别在H13钢表面激光熔覆N iFeBSi-Si3N4和N iFeBSi合金,考察了Si3N4对N iFeB-Si合金组织及腐蚀性能的影响。采用光学显微镜、扫描电子显微镜、X射线衍射仪及动电位极化技术对熔覆层的组织及腐蚀性能进行研究。结果... 利用连续波CO2激光器分别在H13钢表面激光熔覆N iFeBSi-Si3N4和N iFeBSi合金,考察了Si3N4对N iFeB-Si合金组织及腐蚀性能的影响。采用光学显微镜、扫描电子显微镜、X射线衍射仪及动电位极化技术对熔覆层的组织及腐蚀性能进行研究。结果表明,N iFeBSi-Si3N4合金激光熔覆层与H13钢基体形成了良好的冶金结合,改性层呈细密的枝晶状组织,无孔洞裂纹等缺陷。与N iFeBSi合金相比,N iFeBSi-Si3N4合金激光改性层在工业用脱膜剂介质中腐蚀电位正移,腐蚀电流密度下降,抗孔蚀能力提高。 展开更多
关键词 激光熔覆 nifebsi-si3n4合金 H13 组织 电化学腐蚀
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Novel PtPd alloy nanoparticle-decorated g-C_3N_4 nanosheets with enhanced photocatalytic activity for H_2 evolution under visible light irradiation 被引量:7
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作者 Nan Xiao Songsong Li +5 位作者 Shuang Liu Boran Xu Yandong Li Yangqin Gao Lei Ge Guiwu Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第3期352-361,共10页
PtPd bimetallic alloy nanoparticle (NP)-modified graphitic carbon nitride (g-C3N4) nanosheet photocatalysts were synthesized via chemical deposition precipitation. Characterization of the photocatalytic H2 evolution o... PtPd bimetallic alloy nanoparticle (NP)-modified graphitic carbon nitride (g-C3N4) nanosheet photocatalysts were synthesized via chemical deposition precipitation. Characterization of the photocatalytic H2 evolution of the g-C3N4 nanosheets shows that it was significantly enhanced when PtPd alloy NPs were introduced as a co-catalyst. The 0.2 wt% PtPd/g-C3N4 composite photocatalyst gave a maximum H2 production rate of 1600.8 μmol g^–1 h^–1. Furthermore, when K2HPO4 was added to the reaction system, the H2 production rate increased to 2885.0 μmol g^–1 h^–1. The PtPd/g-C3N4 photocatalyst showed satisfactory photocatalytic stability and was able to maintain most of its photocatalytic activity after four experimental photocatalytic cycles. In addition, a possible mechanism for the enhanced photocatalytic activity was proposed and verified by various photoelectric techniques. These results demonstrate that the synergistic effect between PtPd and g-C3N4 helps to greatly improve the photocatalytic activity of the composite photocatalyst. 展开更多
关键词 g-C3n4 nanosheets PtPd alloy nanoparticles H2 evolution PHOTOCATALYSIS
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Wettability of CuNi-Ti Alloys on Si_3N_4 and Interfacial Reaction Products 被引量:1
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作者 Chuangeng WAN Huaping XIONG and Zhenfeng ZHOU (Dept. of Materials Science and Engineering, Jilin University of Technology, Changchun 130025, China)(To whom correspondence should be addressed) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1996年第3期219-222,共4页
Based on the alloy Cu55Ni45 (at pct), holding the proportion of Cu to Ni in constant and in the temperature range of 1233~1573 K, the wetting angles of CuNi-0~56 at pct Ti alloys on Si3N4 have been measured by the ses... Based on the alloy Cu55Ni45 (at pct), holding the proportion of Cu to Ni in constant and in the temperature range of 1233~1573 K, the wetting angles of CuNi-0~56 at pct Ti alloys on Si3N4 have been measured by the sessile drop method. With the increase of Ti content, the wetting angles decreased. The equilibrium wetting angle was 5° when Ti content ≥32 at pct.In the case of same Ti content, the activity of Ti in CuNiTi alloy was weaker than that in CuTi alloy The cross-section of the CuNiTi-Si3N4 interface and the elements distribution were examined by scanning electron microscope with X-ray wave-dispersion spectrometer, and the reaction products formed at the interface were determined by X-ray diffiaction analysis method. 展开更多
关键词 SI ni Wettability of Cuni-Ti alloys on Si3n4 and Interfacial Reaction Products TI
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Evaluation of the Properties of Si3N4/Si3N4 Joint Brazed Using a Filler Alloy Containing Pd
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作者 M. Naka Jie ZHANG Yu ZHOU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第z1期187-188,共2页
Si3N4 ceramic was jointed to itself using a filler alloy of Cu76.5Pd8.5Ti15, and the mechanical properties of the jointwere measured and analyzed. By using a filler alloy of Cu76.5Pd8.5Ti15, the SisN4/SisN4 joints wer... Si3N4 ceramic was jointed to itself using a filler alloy of Cu76.5Pd8.5Ti15, and the mechanical properties of the jointwere measured and analyzed. By using a filler alloy of Cu76.5Pd8.5Ti15, the SisN4/SisN4 joints were obtained bybrazing at 1373~1473 K for 0.9~5.4 ks under a pressure of 2×10-3 MPa. The effect of brazing parameters on theshear strength of the joint was investigated. When the brazing temperature and holding time is 1423 K and 5.4 ksrespectively, the maximum shear strength of the Si3N4/Si3N4 joint is obtained to be 198 MPa. 展开更多
关键词 SI3n4 ceramic Active brazing Ci-Pd-Ti FILLER alloy SHEAR strength
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非晶合金NiB/MCM-41催化合成3-(N-苄基)氨基-4-甲氧基乙酰苯胺
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作者 吕志果 辛全礼 +3 位作者 郭振美 李露 于世涛 宋湛谦 《精细化工》 EI CAS CSCD 北大核心 2007年第3期308-312,共5页
用负载型非晶合金NiB/MCM-41中孔分子筛催化剂将3-氨基4-甲氧基乙酰苯胺与苯甲醛缩合加氢制备3.(N-苄基)-氨基4-甲氧基乙酰苯胺,产物收率95%以上,比采用RaneyNi收率提高12%,较SiO2载体制成的催化剂收率提高5%。研究表明,中... 用负载型非晶合金NiB/MCM-41中孔分子筛催化剂将3-氨基4-甲氧基乙酰苯胺与苯甲醛缩合加氢制备3.(N-苄基)-氨基4-甲氧基乙酰苯胺,产物收率95%以上,比采用RaneyNi收率提高12%,较SiO2载体制成的催化剂收率提高5%。研究表明,中孔结构有利于减少体积较大分子的内扩散效应,发挥负载型非晶合金的高活性、选择性和稳定性。采用该催化剂合成3-(N-苄基)-氨基4-甲氧基乙酰苯胺的适宜条件为:催化剂中Ni负载量埘(Ni)=10%,n(AMA):n(BAD)=1:1.1,m(cat)/m(AMA)=2.5%,反应温度55~65℃,反应压力1.2MPa。 展开更多
关键词 3-(n-苄基)-氨基4-甲氧基乙酰苯胺 负载型非晶态合金催化剂 MCM-41中孔分子筛 3-氨基4-甲氧 基乙酰苯胺
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FeCo alloy@N-doped graphitized carbon as an efficient cocatalyst for enhanced photocatalytic H2 evolution by inducing accelerated charge transfer 被引量:6
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作者 Sibo Chen Yun Hau Ng +6 位作者 Jihai Liao Qiongzhi Gao Siyuan Yang Feng Peng Xinhua Zhong Yueping Fang Shengsen Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第1期92-101,I0004,共11页
Cocatalysts play important roles in improving the activity and stability of most photocatalysts.It is of great significance to develop economical,efficient and stable cocatalysts.Herein,using Na2CoFe(CN)6 complex as p... Cocatalysts play important roles in improving the activity and stability of most photocatalysts.It is of great significance to develop economical,efficient and stable cocatalysts.Herein,using Na2CoFe(CN)6 complex as precursor,a novel noble-metal-free FeCo@NGC cocatalyst(nano-FeCo alloy@N-doped graphitized carbon) is fabricated by a simple pyrolysis method.Coupling with g-C3 N4, the optimal FeCo@NGC/g-C3N4 receives a boosted visible light driven photocatalytic H2 evolution rate of 42.2 μmol h-1, which is even higher than that of 1.0 wt% Pt modified g-C3N4 photocatalyst.Based on the results of density functional theory(DFT) calculations and practical experiment measurements,such outstanding photocatalytic performance of FeCo@NGC/g-C3N4 is mainly attributed to two aspects.One is the accelerated charge transfer behavior,induced by a photogene rated electrons secondary transfer performance on the surface of FeCo alloy nanoparticles.The other is related to the adjustment of H adsorption energy(approaching the standard hydrogen electrode potential) by the presence of external NGC thin layer.Both factors play key roles in the H2 evolution reaction.Such outstanding performance highlights an enormous potential of developing noble-metal-free bimetallic nano-alloy as inexpensive and efficient cocatalysts for solar applications. 展开更多
关键词 FeCo alloy nanoparticles COCATALYST n-doped graphitized carbon g-C3n4 Visible light Hydrogen evolution
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DCOIT复合Zn-Ni合金抗菌镀层的制备及其耐SRB腐蚀性能研究 被引量:3
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作者 翟晓凡 管方 +2 位作者 王楠 段继周 侯保荣 《表面技术》 EI CAS CSCD 北大核心 2019年第7期247-255,共9页
目的提高Zn-Ni合金镀层的耐微生物腐蚀性能。方法在硫酸盐电镀液中添加梯度浓度的4,5-二氯-N-辛基-4-异噻唑啉-3-酮(DCOIT),利用恒电流沉积方法,在碳钢表面阴极电沉积获得DCOIT复合Zn-Ni合金镀层。通过电沉积电位监测与电流效率计算评价... 目的提高Zn-Ni合金镀层的耐微生物腐蚀性能。方法在硫酸盐电镀液中添加梯度浓度的4,5-二氯-N-辛基-4-异噻唑啉-3-酮(DCOIT),利用恒电流沉积方法,在碳钢表面阴极电沉积获得DCOIT复合Zn-Ni合金镀层。通过电沉积电位监测与电流效率计算评价DCOIT对电沉积过程的影响,利用扫描电子显微镜、电子能谱、X射线晶体衍射等研究DCOIT对Zn-Ni复合镀层形貌、结构与Ni含量的影响,使用傅里叶红外吸收光谱和荧光显微观察法验证DCOIT的成功复合及复合镀层的抗菌性能,最后将DCOIT复合Zn-Ni合金镀层暴露于硫酸盐还原菌(SRB)中,监测菌液的pH与菌体浓度,同时计算镀层的腐蚀速率,并观察镀层的腐蚀形貌,评价复合镀层的耐SRB腐蚀性能。结果DCOIT在电沉积过程中会吸附在沉积表面,造成沉积电位负移,并略微降低了电流效率。DCOIT的添加显著改变了复合镀层的形貌、结构与Ni含量,其Ni含量与DCOIT的添加量呈线性增长关系,导致其晶体结构转变。DCOIT以有效形式存在于复合Zn-Ni合金镀层中,并显示出抗菌性能,DCOIT添加量为2mmol/L时,镀层中的复合量最高,抗菌性能最好。最后,DCOIT复合Zn-Ni合金镀层能有效抑制环境中SRB的生长与代谢,自身腐蚀速率减慢,耐蚀性能明显增强。结论DCOIT能够以有效形式复合于Zn-Ni合金镀层内部,并有效提高了镀层的抗菌性能,使其获得增强的耐SRB腐蚀性能。 展开更多
关键词 Zn-ni合金镀层 电镀层 4 5-二氯-n-辛基-4-异噻唑啉-3-酮 硫酸盐还原菌 抗菌 耐蚀
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[(CH_(3))_(4)N]_(2)Mn_(0.6)Zn_(0.4)Br_(4):Lead-free MnII-based hybrid halide with high photoluminescence quantum yield for backlight displays
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作者 Xiaoting Liu Jiapeng Yang +5 位作者 Wenya Chen Fan Yang Yihuang Chen Xiaojuan Liang Shuang Pan Weidong Xiang 《Nano Research》 SCIE EI CSCD 2023年第4期5894-5899,共6页
High efficient lead halide perovskites with wide-color gamut properties have emerged as new candidates for backlight displays.However,the toxicity of lead and the instability of halide perovskites greatly limit their ... High efficient lead halide perovskites with wide-color gamut properties have emerged as new candidates for backlight displays.However,the toxicity of lead and the instability of halide perovskites greatly limit their practical applications.Herein,the luminescent powders of[(CH_(3))4N]2MnBr_(4)and[(CH_(3))4N]MnBr3 were synthesized via a simple yet robust solvent evaporation method.[(CH_(3))4N]2MnBr_(4)with tetrahedral coordination Mn^(2+)and[(CH_(3))4N]MnBr3 with octahedral coordination Mn^(2+)show green at 517 nm and red emission peaks at 620 nm,respectively,originating from the^(4)T1-^(6)A_(1)transition of Mn^(2+).To enhance optical of manganese halide via effective alloying,Zn^(2+)-doped[(CH_(3))4N]2MnBr_(4)was successfully prepared,and the quantum efficiency of[(CH_(3))_(4)N]_(2)Mn_(0.6)Zn_(0.4)Br_(4)was as high as 65%.Furthermore,[(CH_(3))4N]2Mn0.6Zn0.4Br_(4)exhibits better optical and thermal stability compared to[(CH_(3))4N]2MnBr_(4).[(CH_(3))_(4)N]_(2)Mn_(0.6)Zn_(0.4)Br_(4)@CsPbBr_(1.2)I_(1.8)light conversion films with different green-to-red ratios are placed in backlight display devices,and their color gamut exceeds 106%of the National Television Standards Committee(NTSC)1953 standard,which is superior to the currently reported Mn-based perovskite.This work broadly shows that the[(CH_(3))_(4)N]_(2)Mn_(0.6)Zn_(0.4)Br_(4)will provide effective route to fabricate stable and high-performance lead-free liquid crystal displays. 展开更多
关键词 [(CH3)4n]MnBr3 [(CH3)4n]2Mn0.6Zn0.4Br4 stability Zn/Mn alloying backlight display
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Triethanolamine-mediated photodeposition formation of amorphous Ni-P alloy for improved H2-evolution activity of g-C3N4 被引量:9
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作者 Huogen Yu Jiachao Xu +2 位作者 Duoduo Gao Jiajie Fan Jiaguo Yu 《Science China Materials》 SCIE EI CSCD 2020年第11期2215-2227,共13页
Developing efficient,stable,and low-cost novel electron-cocatalysts is crucial for photocatalytic hydrogen evolution reaction.Herein,amorphous Ni-P alloy particles were successfully modified onto g-C3N4 to construct t... Developing efficient,stable,and low-cost novel electron-cocatalysts is crucial for photocatalytic hydrogen evolution reaction.Herein,amorphous Ni-P alloy particles were successfully modified onto g-C3N4 to construct the Ni-P/g-C3N4 photocatalyst through a simple and green triethanolamine(TEOA)-mediated photodeposition method.It was found that the TEOA could serve as an excellent complexing agent to coordinate with Ni2+to form[Ni(TEOA)]^2+complex,which can promote the rapid and effective deposition of amorphous Ni-P alloy on the g-C3N4 surface.Photocatalytic tests suggest that the hydrogen-evolution performance of gC3N4 can be greatly promoted through integrating amorphous Ni-P alloy.Especially,the Ni-P/g-C3N4(5 wt%)exhibits the superior H2-generation activity(118.2μmol h^-1g^-1),which is almost 35.8 times that of bare g-C3N4.Furthermore,the amorphous Ni-P alloy cocatalyst can also serve as the general hydrogen-production cocatalyst to greatly enhance the photocatalytic performance of traditional semiconductor materials such as Ti O2 and Cd S.Based on the present results,the mechanism of the amorphous Ni-P alloy as the high-efficiency electron transfer medium was proposed for the boosted H2-generation rate.The present facile route may broaden the horizons for the efficient development of highly active cocatalysts in photocatalytic field. 展开更多
关键词 photocatalysis H2evolution g-C3n4 amorphous niP alloy PHOTODEPOSITIOn
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Solid-Liquid State Bonding of Si3N4 Ceramics with Ceramic-Modified Brazing Alloy 被引量:6
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作者 杨俊 吴爱萍 +2 位作者 邹贵生 张德库 刘根茂 《Tsinghua Science and Technology》 SCIE EI CAS 2004年第5期601-606,共6页
Solid-liquid state bonding of Si3N4 ceramics with TiN-modified Ag-Cu-Ti brazing alloy was used'- to enhance joint strength. The effects of the TiN particles on the microstructures, interfacial reactions, and roo... Solid-liquid state bonding of Si3N4 ceramics with TiN-modified Ag-Cu-Ti brazing alloy was used'- to enhance joint strength. The effects of the TiN particles on the microstructures, interfacial reactions, and room-temperature properties of the joints were investigated. The results show that the TiN particles are gen- erally well dispersed in the Ag-Cu eutectic base and the interface between them is both clean and com-pact. Changes in the TiN volume fractions from 0 to 20% exert no noticeable effect on the interfacial reac-tion between Ag-Cu-Ti and the substrates. Other bonding parameters being constant, the TiN volume frac-tion in the filler material plays a key role in the joint properties. For TiN volume fractions below 20%, the joints are reinforced, especially joints with 5% and 20% TiN. The average shearing strength of joints with 5% TiN is 200.8 MPa, 30% higher than that of joints with no TiN (154.1 MPa). However, for TiN volumes frac- tions above 20%, the joint strengths decrease. 展开更多
关键词 solid-liquid state bonding Si3n4 ceramics ceramic-modified brazing alloy interracial reactions room-temperature properties of joints
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Microstructure and brazing mechanism of porous Si_3N_4/Invar joint brazed with Ag-Cu-Ti/Cu/Ag-Cu multi-layered filler 被引量:9
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作者 J.Zhang J.Y.Liu T.P.Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第4期713-719,共7页
Porous Si3N4 was brazed to Invar alloy in this study, and Ag-Cu-Ti/Cu/Ag-Cu multi-layered filler was designed to inhibit the formation of Fe2Ti and Ni3Ti intermetallic compounds. The effects of the brazing temperature... Porous Si3N4 was brazed to Invar alloy in this study, and Ag-Cu-Ti/Cu/Ag-Cu multi-layered filler was designed to inhibit the formation of Fe2Ti and Ni3Ti intermetallic compounds. The effects of the brazing temperature and the thickness of Cu interlayer on the microstructure and mechanical properties of brazed joints were investigated. The typical microstructure of the joint brazed with multi-layered filler was porous Si3N4/TiN + Ti5Si3/Ag-Cu eutectic[Cu[Ag-Cu eutectic/Cu-rich layer + diffusion layer/Invar. When the brazing temperature increased, the reaction layer at the ceramic/filler interface grew thicker and the Cu interlayer turned thinner. As the thickness of Cu interlayer increased from 50 to 150 μm, the joint strength first increased and then decreased. In this research, the maximum shear strength (73 MPa) was obtained when being brazed at 1173 K with a 100 μm Cu interlayer applied in the filler, which was 55% higher than that brazed with single Ag-Cu-Ti brazing alloy and had reached 86% of the ceramic. The release of residual stress and the barrier effect of Cu interlayer to inhibit the formation of Fe2Ti and Ni3Ti intermetallics played the major role in the improvement of joint strength. 展开更多
关键词 Porous Si3n4 Invar alloy BRAZInG MICROSTRUCTURE Mechanical properties
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铝合金表面三嗪二硫醇和硅烷纳米复合薄膜的制备及表征 被引量:5
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作者 王芳 王茜 +1 位作者 王亚斌 刘俊俊 《功能材料》 EI CAS CSCD 北大核心 2011年第3期432-435,共4页
通过电化学方法,在铝合金表面制备6-N,N-二丁基胺-1,3,5-三嗪-2,4-二硫醇单盐(DBN)的纳米聚合薄膜(PDB),然后采用自组装技术对铝合金表面PDB膜进行十六烷基三甲氧基硅烷化处理,形成疏水性的高分子纳米复合薄膜(CPDB)。通过循环伏安法解... 通过电化学方法,在铝合金表面制备6-N,N-二丁基胺-1,3,5-三嗪-2,4-二硫醇单盐(DBN)的纳米聚合薄膜(PDB),然后采用自组装技术对铝合金表面PDB膜进行十六烷基三甲氧基硅烷化处理,形成疏水性的高分子纳米复合薄膜(CPDB)。通过循环伏安法解释了DBN在铝合金表面的反应及PDB的生长过程,同时分析了CPDB膜的形成机理。借助傅里叶变换红外光谱仪(FT-IR)、X射线光电子能谱仪(XPS)、扫描电子显微镜(SEM)、接触角测量仪对铝合金表面薄膜的特性进行了表征。结果表明,PDB膜形成后铝合金表面的接触角从未镀膜的89.9°上升到124.3°,CPDB膜形成后接触角达135.8°;SEM和XPS测定表明该方法可以有效地在铝合金表面获得均匀致密的高分子纳米复合薄膜。 展开更多
关键词 铝合金 6-n n-二丁基胺-1 3 5-三嗪-2 4-二硫醇单盐 电化学聚合 硅烷化处理 纳米复合薄膜
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