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PREPARATION AND PROPERTIES OF BULK CERAMICS VIA PYROLYSIS OF POLYCARBOSILANE WITH ACTIVE FILLERS I. EVOLUTION PROCESS IN ACTIVE FILLER CONTROLLED PYROLYSIS 被引量:2
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作者 H.F.Hu, Z.H.Chen and C.J.Zhou Department of Material Engineering & Applied Chemistry, National University of Defense Technology, Changsha 410073,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期1111-1115,共5页
The pyrolytic process of polycarbosilane (PCS) with active fillers (Ti, TiH 2, TiB 2, Cr, CrSi 2) is investigated. The ceramic yields with active fillers reach over 100% in N 2 atmosphere, and no shrinkage occurs when... The pyrolytic process of polycarbosilane (PCS) with active fillers (Ti, TiH 2, TiB 2, Cr, CrSi 2) is investigated. The ceramic yields with active fillers reach over 100% in N 2 atmosphere, and no shrinkage occurs when 12vol% Ti, or 4vol% Cr, or 3vol% CrSi 2 is added into PCS. XRD patterns indicate that metal carbides and nitrides form by reacting with gaseous evolution and N 2. 展开更多
关键词 POLYCARBOSILANE active filler PYROLYSIS ceramic YIELD SHRINKAGE
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PREPARATION AND PROPERTIES OF BULK CERAMICS VIA PYROLYSIS OF POLYCARBOSILANE WITH ACTIVE FILLERS II.FLEXURAL STRENGTH AND ANTI-OXIDATIVE PROPERTIES OF ACTIVE FILLER/PCS DERIVED BULK CERAMICS 被引量:1
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作者 H.F.Hu,Z.H.Chen, and C.J.Zhou Department of Material Engineering & Applied Chemistry, National University of Defense Technology, Changsha 410073,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期1116-1118,共3页
The flexural strengths and oxidative resistant properties of the ceramics derived from polycarbosilane and active fillers (Ti, TiH 2, TiB 2, Cr, and CrSi 2) were measured and characterized. The introduction of acti... The flexural strengths and oxidative resistant properties of the ceramics derived from polycarbosilane and active fillers (Ti, TiH 2, TiB 2, Cr, and CrSi 2) were measured and characterized. The introduction of active fillers enhances slightly the flexural strengths, and further densification is required to obtain higher strengths. The oxidative resistant behaviors of the specimens with active fillers are, by means of weight gain in air, poorer compared with those without active fillers. 展开更多
关键词 POLYCARBOSILANE active filler flexural strength oxidative resistance
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Microstructure and properties of the joints of ZrO2 ceramic/ stainless steel brazed in vacuum with AgCuTi active filler metal 被引量:11
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作者 Liu Xu Huang Xiaomeng +2 位作者 Ma Huibin Shi Xiumei Qi Yuefeng 《China Welding》 EI CAS 2018年第2期52-56,共5页
The ZrO2 ceranfic was successfully jointed to stainless steel by vacuum brazing with active filler metal. The AgCuTi active filler metal was used and the joining was performed at a temperature of 850 ℃ for 10 rain. T... The ZrO2 ceranfic was successfully jointed to stainless steel by vacuum brazing with active filler metal. The AgCuTi active filler metal was used and the joining was performed at a temperature of 850 ℃ for 10 rain. The microstructures of the joints were characterized by metallographic microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). Metallographic microscopy analysis shows that the morphology of the cross section was a sandwich structure and the TiO is observed in the surface of ZrO2/ stainless steel. The diffusion and enrichment of the elements are the key roles in the brazing of ZrO2 ceramic and stainless steel. The formation of TiCu compounds inhibited the further diffusion of titanium into stainless steel or the ZrO2 ceramic to form TiO compound. In the experimental conditions, the average tensile strength is 80MPa for the joint of ZrO2 ceramic / AgCuTi/ stainless steel systems. A complete joint is formed between the ZrO2 ceramic and stainless steel with the leakage rate at the degree of 10 ^-12 Pa · m^3/s. 展开更多
关键词 ZrO2 ceramic AgCuTi active filler metal vacuum active brazing technique
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Dual-functional MnS_(2)/MnO_(2) heterostructure catalyst for efficient acidic hydrogen evolution reaction and assisted degradation of organic wastewater
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作者 Wen Kang Zhao Zi Qiang Ma +6 位作者 Jia Yu Zheng Chang Bao Han Kai Ling Zhou Ming Yang Hao De Cai Fang Yi Xia Hui Yan 《Journal of Energy Chemistry》 SCIE EI CSCD 2023年第12期215-224,I0007,共11页
The design and synthesis of non-precious metal dual-functional electrocatalysts through the modulation of electronic structure are important for the development of renewable hydrogen energy.Herein,MnS_(2)/MnO_(2)-CC h... The design and synthesis of non-precious metal dual-functional electrocatalysts through the modulation of electronic structure are important for the development of renewable hydrogen energy.Herein,MnS_(2)/MnO_(2)-CC heterostructure dual-functional catalysts with ultrathin nanosheets were prepared by a twostep electrodeposition method for efficient acidic hydrogen evolution reaction(HER) and degradation of organic wastewater(such as methylene blue(MB)).The electronic structure of Mn atoms at the MnS_(2)/MnO_(2)-CC heterostructure interface is reconfigured under the joint action of S and O atoms.Theoretical calculations show that the Mn d-band electron distribution in MnS_(2)/MnO_(2)-CC catalyst has higher occupied states near the Fermi level compared to the MnO_(2) and MnS_(2) catalysts,which indicates that MnS_(2)/MnO_(2)-CC catalyst has better electron transfer capability and catalytic activity.The MnS_(2)/MnO_(2)-CC catalysts require overpotential of only 66 and 116 mV to reach current density of 10 and 100 mA cm^(-2)in MB/H_(2)SO_(4) media.The MnS_(2)/MnO_(2)-CC catalyst also has a low Tafel slope(26.72 mV dec^(-1)) and excellent stability(the performance does not decay after 20 h of testing).In addition,the MB removal efficiency of the MnS_(2)/MnO_(2)-CC catalyst with a better kinetic rate(0.0226) can reach 97.76%,which is much higher than that of the MnO_(x)-CC catalyst(72.10%).This strategy provides a new way to develop efficient and stable non-precious metal dual-functional electrocatalysts for HER and organic wastewater degradation. 展开更多
关键词 Hydrogen evolution reaction(HER) dual-functional electrocatalysts HETEROSTRUCTURE Catalytic activity Degradation of organic wastewater
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Direct active soldering of Al_(0.3)CrFe _(1.5)MnNi_(0.5) high entropy alloy to 6061-Al using Sn-Ag-Ti active solder 被引量:4
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作者 L.C.TSAO S.Y.CHANG Y.C.YU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第4期748-756,共9页
Al0.3CrFe1.5MnNi0.5 high entropy alloys(HEA)have special properties.The microstructures and shear strengths of HEA/HEA and HEA/6061-Al joints were determined after direct active soldering(DAS)in air with Sn3.5Ag4Ti ac... Al0.3CrFe1.5MnNi0.5 high entropy alloys(HEA)have special properties.The microstructures and shear strengths of HEA/HEA and HEA/6061-Al joints were determined after direct active soldering(DAS)in air with Sn3.5Ag4Ti active filler at 250°C for 60 s.The results showed that the diffusion of all alloying elements of the HEA alloy was sluggish in the joint area.The joint strengths of HEA/HEA and HEA/6061-Al samples,as analyzed by shear testing,were(14.20±1.63)and(15.70±1.35)MPa,respectively.Observation of the fracture section showed that the HEA/6061-Al soldered joints presented obvious semi-brittle fracture characteristics. 展开更多
关键词 high entropy alloy Sn3.5Ag4Ti active filler Al0.3CrFe1.5MnNi0.5 direct active soldering
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A General Strategy for Efficiently Constructing Multifunctional Cluster Fillers Using a Three-Fluid Nozzle Spray Drying Technique for Dental Restoration 被引量:1
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作者 Dan-Lei Yang Dan Wang +5 位作者 Hao Niu Rui-Li Wang Mei Liu Fei-Min Zhang Jie-Xin Wang Mei-Fang Zhu 《Engineering》 SCIE EI 2022年第1期138-147,共10页
Multifunctional fillers are greatly required for dental resin composites(DRCs).In this work,a spray dryer with a three-fluid nozzle was applied for the first time to construct high-performance complex nanoparticle clu... Multifunctional fillers are greatly required for dental resin composites(DRCs).In this work,a spray dryer with a three-fluid nozzle was applied for the first time to construct high-performance complex nanoparticle clusters(CNCs)consisting of different functional nanofillers for dental restoration.The application of a three-fluid nozzle can effectively avoid the aggregation of different nanoparticles with opposite zeta potentials before the spray drying process in order to construct regularly shaped CNCs.For a SiO_(2)–ZrO_(2) binary system,the SiO_(2)–ZrO_(2) CNCs constructed using a three-fluid nozzle maintained their excellent mechanical properties((133.3±4.7)MPa,(8.8±0.5)GPa,(371.1±13.3)MPa,and(64.5±0.7)HV for flexural strength,flexural modulus,compressive strength,and hardness of DRCs,respectively),despite the introduction of ZrO_(2) nanoparticles,whereas their counterparts constructed using a two-fluid nozzle showed significantly decreased mechanical properties.Furthermore,heat treatment of the SiO_(2)-ZrO_(2) CNCs significantly improved the mechanical properties and radiopacity of the DRCs.The DRCs containing over 10%mass fraction ZrO_(2) nanoparticles can meet the requirement for radiopaque fillers.More importantly,this method can be expanded to ternary or quaternary systems.DRCs filled with SiO_(2)-ZrO_(2)-ZnO CNCs with a ratio of 56:10:4 displayed high antibacterial activity(antibacterial ratio>99%)in addition to excellent mechanical properties and radiopacity.Thus,the three-fluid nozzle spray drying technique holds great potential for the efficient construction of multifunctional cluster fillers for DRCs. 展开更多
关键词 Multifunctional cluster fillers Three-fluid nozzle spray drying Mechanical properties Antibacterial activity Radiopacity Dental resin composites
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Effects of pyrolysis temperature and fillers on joining of ceramics via silicone resin 被引量:1
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作者 所俊 陈朝辉 +1 位作者 郑文伟 韩卫敏 《中国有色金属学会会刊:英文版》 EI CSCD 2005年第6期1322-1327,共6页
The joining of graphite, ceramic SiC and C_f/SiC composites via preceramic silicone resin(SR) at high temperature (8001400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and a... The joining of graphite, ceramic SiC and C_f/SiC composites via preceramic silicone resin(SR) at high temperature (8001400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and active fillers were especially discussed. The results show that the curing process of SR was accomplished by consuming Si—OH. The temperature of 1200℃ is the appropriate treating temperature for graphite and SiC ceramic, and the temperature of 1400℃ is suitable for C_f/SiC composites. Inert filler SiC powder(5%, mass fraction) has much positive influence on the shear strength of the joints. Active filler nano Ai, Si powder can greatly improve the properties of the joints treated at high temperature. The improvement is over 700%. 展开更多
关键词 有机硅树脂 热解温度 填充物 陶瓷基复合材料
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Bimetallic active site nuclear-shell heterostructure enables efficient dual-functional electrocatalysis in alkaline media 被引量:1
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作者 Yu Cheng Xi Zhou +3 位作者 Qin-Min Pan Li-Fang Zhang Yu-Feng Cao Tao Qian 《Rare Metals》 SCIE EI CAS CSCD 2023年第9期3024-3033,共10页
Hydrogen,as a green and clean next-generation fuel,is a key to achieving the goal of carbon neutrality.Constructing an electrocatalyst with bifunctional hydrogen evolution and oxygen evolution activity in the same ele... Hydrogen,as a green and clean next-generation fuel,is a key to achieving the goal of carbon neutrality.Constructing an electrocatalyst with bifunctional hydrogen evolution and oxygen evolution activity in the same electrolyte is a key technology for producing hydrogen via water splitting.Herein,a bimetallic active site catalyst,which possessed an edge-riched MoS_(2)nanoflakes array vertically growing on cubic CoS_(2),forming a nuclear-shell heterogeneous configuration,termed CSC-Mo S_(2)@Co S_(2).was reported The optimal CSC-Mo S_(2)@Co S_(2)-24 possessed good dualfunctional electrocatalytic activity(hydrogen evolution(HER),10 m A·cm^(-2)@241.5 m V and oxygen evolution(OER),10 m A·cm^(-2)@350 m V).Especially,CSC-Mo S_(2)@CoS_(2)-24 exhibited an extremely high mass activity for HER,and only required an overpotential of~550 m V when reaching a large current density of 1422 m A·mg^(-1),which was20.6-fold that of the bulk CoS_(2)(69 m A·mg^(-1)),as well as exhibiting stability of up to 100 h.The good electrocatalytic performance was attributed to the nuclear-shell heterostructure of Mo S_(2)@CoS_(2)hybrid could bring critical synergies,improving efficient mass transfer and electron transfer processes between Co S_(2)and Mo S_(2),which collaboratively promoted the electrocatalytic kinetics.It is foreseeable that the method proposed in this work will have guiding value for the preparation of dual-functional electrocatalysts with multi-interface heterostructures by assembling layered sulfides on cubic sulfides. 展开更多
关键词 dual-functional electrocatalysts Nuclearshell cubic heterostructure Edge-riched Bimetallic active site Strong interaction
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钎焊温度对BNi-2非晶钎料钎焊1Cr18Ni9Ti不锈钢组织和性能的影响 被引量:1
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作者 田晓羽 张志伟 +4 位作者 周晨 赵连清 田洋光 付伟 宋晓国 《焊接学报》 EI CAS CSCD 北大核心 2024年第6期61-67,共7页
采用BNi-2非晶钎料成功钎焊了1Cr18Ni9Ti不锈钢,通过扫描电子显微镜及能谱仪对不同钎焊温度下钎焊接头的界面微观组织进行了表征及分析,并对钎焊接头的抗剪强度进行了测试,探究了钎焊温度对接头界面组织及力学性能的影响.结果表明钎焊... 采用BNi-2非晶钎料成功钎焊了1Cr18Ni9Ti不锈钢,通过扫描电子显微镜及能谱仪对不同钎焊温度下钎焊接头的界面微观组织进行了表征及分析,并对钎焊接头的抗剪强度进行了测试,探究了钎焊温度对接头界面组织及力学性能的影响.结果表明钎焊接头的界面微观组织从钎缝中心到母材可以被分为3个区域,钎焊温度为1050℃时钎缝区主要为Ni基固溶体+Cr-B相,扩散区分布有Fe-Ni固溶体及细小条状的σ-FeCr相,晶间渗入区中奥氏体晶间处分布着σ-FeCr相及Cr-B相.随着钎焊温度的升高,B元素扩散速度不断加快,Cr-B相的晶间渗入程度加剧;钎缝中心的块状Cr-B相逐渐减小直至1150℃时消失,钎缝区组织均匀化.在温度的作用下,钎缝宽度呈现先减小后增大的趋势.而接头的抗剪强度呈先上升后下降的趋势;最大抗剪强度出现在1050℃时,约265 MPa;而接头的断裂形式主要以韧性断裂为主.利用阿伦尼乌斯方程得到了B原子的扩散活化能为8.18×10^(4)×nJ/mol,n为时间指数. 展开更多
关键词 钎焊 非晶钎料 微观组织 不锈钢 扩散激活能
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石墨与金属焊接技术研究现状
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作者 孔德浩 张铭雨 +3 位作者 季雨凯 韦勇 钟志宏 宋奎晶 《焊接》 2024年第1期73-80,共8页
石墨与金属焊接是实现材料性能优越化的有效途径。从介绍石墨与金属焊接技术需求和难点出发,重点综述了石墨与铝合金、铜合金以及其他合金钎焊、扩散焊连接领域的研究进展,总结了钎焊、扩散焊技术实现石墨与金属有效冶金结合的机理,分... 石墨与金属焊接是实现材料性能优越化的有效途径。从介绍石墨与金属焊接技术需求和难点出发,重点综述了石墨与铝合金、铜合金以及其他合金钎焊、扩散焊连接领域的研究进展,总结了钎焊、扩散焊技术实现石墨与金属有效冶金结合的机理,分析了活性钎料在钎焊过程中的作用以及润湿性研究成果,简单概括了石墨与金属的连接性能,最后指出了当前焊接存在的问题、钎焊和扩散焊技术未来的发展方向,为进一步深入研究及工程应用提供理论基础及技术支撑。 展开更多
关键词 石墨 钎焊 扩散焊 活性钎料
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明胶与葡聚糖复合膜的制备及其对冷藏扇贝品质的影响 被引量:1
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作者 樊凤娇 廖海露 +3 位作者 岳陈林瑞 陈彦初 陈银基 谢宏凯 《食品研究与开发》 CAS 2024年第10期117-126,共10页
为抑制脂质氧化和微生物繁殖,延长扇贝货架期,以肉桂醛和α-生育酚为抗菌和抗氧化剂,制备抗菌、抗氧化明胶-葡聚糖复合膜。扫描电镜证实明胶和葡聚糖兼容性较好,添加活性物质导致复合膜产生粗糙、不均匀和多孔的微观结构。X射线衍射和... 为抑制脂质氧化和微生物繁殖,延长扇贝货架期,以肉桂醛和α-生育酚为抗菌和抗氧化剂,制备抗菌、抗氧化明胶-葡聚糖复合膜。扫描电镜证实明胶和葡聚糖兼容性较好,添加活性物质导致复合膜产生粗糙、不均匀和多孔的微观结构。X射线衍射和红外光谱显示活性物质增强复合膜的结晶度和疏水性。随着活性物质添加量增加,复合膜的厚度、不透明度、抗氧化能力和抗菌能力显著增加,而水蒸气透过性、拉伸强度和断裂伸长率显著降低。相比于未包装和空白复合膜,1.5%活性复合膜显著提升冷藏扇贝贝柱的化学和微生物稳定性,延长其货架期6d。因此,添加双功能活性成分的明胶-葡聚糖复合膜可以作为一种有效包装材料,用于水产品冷藏品质的控制。 展开更多
关键词 明胶 葡聚糖 肉桂醛 Α-生育酚 双功能活性成分 复合膜 扇贝保鲜
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应变速率对炭黑填充丁苯硫化胶应力-应变行为的影响
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作者 朱连超 史文仓 《应用化学》 CAS CSCD 北大核心 2024年第7期959-965,共7页
橡胶材料的应力-应变行为是决定其应用性能的关键指标之一,不同使用条件特别是应变速率对橡胶材料的性能提出了不同的要求。从炭黑补强橡胶的角度出发,系统研究N330、N660和N774这3种炭黑填充丁苯硫化胶的应力-应变行为随应变速率的变... 橡胶材料的应力-应变行为是决定其应用性能的关键指标之一,不同使用条件特别是应变速率对橡胶材料的性能提出了不同的要求。从炭黑补强橡胶的角度出发,系统研究N330、N660和N774这3种炭黑填充丁苯硫化胶的应力-应变行为随应变速率的变化情况。实验发现,丁苯硫化胶的定伸应力均随应变速率增加而增加,且炭黑的补强性能越高定伸应力的增加幅度越大;对任一硫化胶,定伸应力的增长幅度均随应变的增加而减小;当应变达到某一临界值(如300%)时,应变速率对定伸应力增长幅度的影响趋于一致,与是否填充炭黑及炭黑的补强性能无关。在准静态的拉伸测试中,炭黑在橡胶基体中形成的网络化结构将随应变的增加而逐渐破坏,但破坏程度主要与应变大小有关而与应变速率无关。 展开更多
关键词 丁苯硫化胶 炭黑 应力-应变行为 表面活性 填料网络化
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弱碱激发条件下磷渣-水泥复合填料路用性能试验研究
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作者 殷源 林康 +1 位作者 曾卫新 程树范 《硅酸盐通报》 CAS 北大核心 2024年第7期2602-2611,共10页
将磷渣固化后作为路基或路面基层填料是固体废弃物资源化利用的有效途径,具有广泛的经济效益和社会价值。本文通过室内和现场试验,从强度和水稳性的角度分析了磷渣-水泥复合填料的路用性能,并通过具体工程案例论证了本文固化方案的可行... 将磷渣固化后作为路基或路面基层填料是固体废弃物资源化利用的有效途径,具有广泛的经济效益和社会价值。本文通过室内和现场试验,从强度和水稳性的角度分析了磷渣-水泥复合填料的路用性能,并通过具体工程案例论证了本文固化方案的可行性。试验结果表明,弱碱激发(pH=8.0)条件下磷渣混合料在压实、固化后可作为路基填料使用,但固化体强度形成较为缓慢,7 d抗压强度约为28 d的50%。经固化后的磷渣-水泥复合填料具备了一定的耐水性,水泥熟料掺量大于7%(质量分数)时,浸泡60 d后未出现影响完整性的破坏,固化体试样的软化系数随着水泥掺量的增加而下降。在保证强度的基础上,固化剂(Na_(2)SiO_(3))的使用可以减少水泥用量,提高磷渣固化方案的经济性;而过度碱激发(pH=10.0)虽然可以提高磷渣固化体的早期强度,但对28 d强度影响并不显著。现场的工程实践表明,本文提出的弱碱激发磷渣固化方法可以有效实现磷渣的资源化再利用,在公路路基和路面基层填筑工程中具有很强的可推广性。 展开更多
关键词 磷渣(磷石膏) 固体废弃物 碱激发 水泥固化 水稳性 路基填料 路面基层材料
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Application of Ag-Cu-Ti active metal composite filler in ceramic joining:a review
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作者 Yuhang Li Jun WANG +7 位作者 Ziyan SHEN Hangli Qian Wanliang Zhang Kaiyu Zhang Danqing Ying Qihang Zhou Chengshuang Zhou Lin Zhang 《Frontiers of Materials Science》 SCIE CSCD 2023年第4期1-35,共35页
As a structural and functional material with excellent properties,ceramics play an extremely important role in a wide range of industries,including life and production.To expand the range of applications for ceramic m... As a structural and functional material with excellent properties,ceramics play an extremely important role in a wide range of industries,including life and production.To expand the range of applications for ceramic materials,ceramics are often joined to metals and then used.Among the physical and chemical joining methods of ceramics to metals,the AMB method is efficient and simple,suitable for industrial applications,and has been a hot topic of research.However,due to the problems of residual stresses caused by the large difference in thermal expansion coefficients between ceramic and metal brazing,composite fillers have become a very worthwhile solution by regulating the physical properties of the brazing material and improving the weld structure.This review describes the wetting principle and application of Ag‒Cu‒Ti active metal filler in the field of ceramic joining,with emphasis on the current stage of composite filler,and discusses the influence on the former brazing properties and organization after the introduction of dissimilar materials. 展开更多
关键词 BRAZING composite filler residual stress active metal ceramic‒metal joints
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生物接触氧化耦合生物活性炭工艺处理高盐污水实验总结
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作者 杨菊 胡建东 +1 位作者 王刚 高会杰 《炼油技术与工程》 CAS 2024年第1期46-50,共5页
针对炼化企业废水盐含量高、稳定达标处理难、能耗高等问题,提出了生物接触氧化-生物活性炭工艺。通过梯度提高进水盐含量的方法成功驯化出耐盐菌,启动了生物接触氧化单元,池中生物挂膜良好,脱氮除碳效果显著,出水COD(化学需氧量)可稳... 针对炼化企业废水盐含量高、稳定达标处理难、能耗高等问题,提出了生物接触氧化-生物活性炭工艺。通过梯度提高进水盐含量的方法成功驯化出耐盐菌,启动了生物接触氧化单元,池中生物挂膜良好,脱氮除碳效果显著,出水COD(化学需氧量)可稳定控制在90 mg/L以下,总氮在15 mg/L以下。菌群分析结果表明,在高盐含量(高盐)废水环境中,接触氧化单元生物膜中菌群数量和多样性较接种污泥发生明显改变,主要功能菌为Thiovirga、Thauera、Flavobacterium、Gemmobacter、Hydrogenophaga等。在生物活性炭单元,通过耐盐高效菌剂与活性炭的有机结合,提高了该单元对进水COD波动的抗冲击能力,活性炭表面形成生物膜,系统运行稳定,可控制出水COD基本在60 mg/L以下,氨氮质量浓度在2 mg/L以下,总氮在15 mg/L以下。全流程以生物降解为核心,工艺流程短、运行成本低,为高盐污水的稳定达标处理提供了技术支撑。 展开更多
关键词 生物接触氧化 生物活性炭 炼化高盐污水 菌群结构 COD 氨氮 总氮 填料挂膜
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Research progress of nickel based filler for development of diamond tools 被引量:2
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作者 Cui Bing Liu Zhengwei Ding Zichao 《China Welding》 CAS 2021年第4期30-41,共12页
Owing to diamond excellent physical and chemical properties,so synthetic diamond abrasives are extensively used in manufacturing diamond tools are utilized in machining hard and brittle materials.The brazing technolog... Owing to diamond excellent physical and chemical properties,so synthetic diamond abrasives are extensively used in manufacturing diamond tools are utilized in machining hard and brittle materials.The brazing technology is exploited with strong bonding force between the diamond and substrate,which can realize metallurgical and chemical bonding between the filler metals and diamond abrasives.In this paper,the research reports on nickel-based fillers for brazing diamond grains at home and abroad in recent years are reviewed systematically,with emphasis on the influence of alloying elements and active elements on the properties of nickel-based fillers.The advantages and disadvantages of Cr,B,Si,P,Mn,Fe,Cu,W,C in nickel-based fillers and the negative effects of impurity elements were summarized.The shortcomings in the research and application of nickel-based fillers were pointed out,which provided theoretical guidance for further systematic research and development of related technologies. 展开更多
关键词 nickel-based filler diamond tools active element reaction behavior
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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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一种固定化生物填料的制备及应用
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作者 李萍 刘佳 +3 位作者 鲁少杰 陶敏 韩月阳 梁文俊 《环境工程技术学报》 CAS CSCD 北大核心 2023年第6期2240-2247,共8页
采用固定化技术,以聚乙烯醇(PVA)、海藻酸钠(SA)联合构筑凝胶骨架,引入活性炭(AC)、CaCO_(3)和复合菌粉制备一种固定化生物填料(BM填料),对添加到BM填料中的AC进行粒径优化;以乙苯作为目标污染物,考察装填该填料的生物滴滤塔(BTF)对其... 采用固定化技术,以聚乙烯醇(PVA)、海藻酸钠(SA)联合构筑凝胶骨架,引入活性炭(AC)、CaCO_(3)和复合菌粉制备一种固定化生物填料(BM填料),对添加到BM填料中的AC进行粒径优化;以乙苯作为目标污染物,考察装填该填料的生物滴滤塔(BTF)对其去除效果。结果表明:当添加的AC为100目时,BM填料的比表面积达到57.46 m^(2)/g,机械强度最高,对乙苯的去除效果最好。理化性质分析表明,该填料内部为致密的三维网状结构,具有较好的亲水性与吸附性,表面存在大量—OH、—COO-等亲水基团,相同条件下对乙苯吸附量是聚氨酯海绵填料(PU填料)的2.9倍。同时该填料具有较好耐酸性,在pH降至1时依然保持高降解活性。装填BM填料的BTF可在6 d内完成挂膜;经过7 d停滞,去除率5 d可以恢复至100%;在进气乙苯浓度为800~900 mg/m^(3),停留时间(EBRT)为33 s时,仍可将乙苯完全去除。相较于PU填料,以BM为填料的BTF性能更优。 展开更多
关键词 固定化 填料 乙苯 生物滴滤 降解 活性炭
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钨/低活化钢钎焊用铁基非晶钎料与接头微结构
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作者 魏明玉 王建豹 +6 位作者 Jitendar Kumar 羌建兵 王英敏 刘天鸷 封范 练友运 刘翔 《核聚变与等离子体物理》 CAS CSCD 北大核心 2023年第2期132-139,共8页
为了连接W和CLF-1 RAFM钢,设计出由低活化元素组成的Fe-B-Si、Fe-B-Si-Sn、Fe-B-Si-Cr-(Sn)、Fe-B-Si-P-(Cr,Sn)、Fe-B-Si-Mn-(Ga,Sn)和Fe-B-Si-(Cr,Mn,Ga,Ta,Sn)系列Fe基非晶钎料,结合熔体快淬技术制备出非晶合金箔带,并对W/CLF-1 RAF... 为了连接W和CLF-1 RAFM钢,设计出由低活化元素组成的Fe-B-Si、Fe-B-Si-Sn、Fe-B-Si-Cr-(Sn)、Fe-B-Si-P-(Cr,Sn)、Fe-B-Si-Mn-(Ga,Sn)和Fe-B-Si-(Cr,Mn,Ga,Ta,Sn)系列Fe基非晶钎料,结合熔体快淬技术制备出非晶合金箔带,并对W/CLF-1 RAFM钢接头微结构进行了对比研究。采用X-射线衍射仪对箔带样品与焊缝进行了相鉴定;通过差热分析测量了非晶箔带的熔化温度和液相线温度;利用光学金相和电子探针分析了焊缝组织形貌和元素分布。结果表明,利用Fe-B-Si、Fe-B-Si-Cr和Fe-B-Si-Mn-Sn非晶钎料可获得结构完整的W/CLF-1钢接头;前两种钎料得到的焊缝组织基体相为α-Fe固溶体,而含Mn钎料形成的焊缝基体为马氏体组织;在高温钎焊过程中,这些Fe基非晶钎料中的高B含量促使FeWB、FeW2B2和Fe3B型金属间化合物在焊缝中形成,并有效地阻止了W元素向低活化钢基体长程扩散。所设计的低活化Fe基非晶钎料可用于W和低活化钢的连接和接头性能研究。 展开更多
关键词 低活化Fe基非晶钎料 钎焊 W/钢连接 偏滤器 第一壁
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3D-SiO_(2)-fiber中间层对SiC与Nb真空钎焊的影响
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作者 马蔷 王涛 +4 位作者 陈永威 何鹏 陈晓江 金晓 郑斌 《焊接学报》 EI CAS CSCD 北大核心 2023年第8期21-27,I0004,共8页
缓解异种材料钎焊接头残余应力过程中,针对颗粒增强相添加量少、团聚等问题,引入一种新型三维SiO_(2)短纤维编织,呈疏松、多孔结构的复合材料中间层(3D-SiO_(2)-fiber)辅助SiC陶瓷与Nb钎焊连接.采用SEM,XRD和电子万能试验机等对活性钎料... 缓解异种材料钎焊接头残余应力过程中,针对颗粒增强相添加量少、团聚等问题,引入一种新型三维SiO_(2)短纤维编织,呈疏松、多孔结构的复合材料中间层(3D-SiO_(2)-fiber)辅助SiC陶瓷与Nb钎焊连接.采用SEM,XRD和电子万能试验机等对活性钎料在3D-SiO_(2)-fiber中间层表面润湿性、接头微观组织和力学性能进行表征与分析.结果表明,当Ti元素含量从4.5%增加到6.0%,AgCu-Ti活性钎料在3D-SiO_(2)-fiber中间层表面润湿角从90°降低到3°,润湿性得到显著改善,且AgCu-Ti活性钎料浸入3D-SiO_(2)-fiber中间层深度不断增加;随着钎焊温度的提高(950~980℃)及保温时间(10~25 min)的延长,SiO_(2)短纤维与AgCu-6.0Ti活性钎料反应逐渐充分.该方法不仅保证SiO_(2)短纤维能够大量添加到合金钎料中,而且形成Cu_(3)Si,TiSi,α-Ti及Ti_(2)Cu颗粒相弥散分布于焊缝中,从而有效缓解钎焊接头残余应力,提高接头力学性能,实现陶瓷与金属复合构件的可靠连接. 展开更多
关键词 残余应力 复合材料中间层3D-SiO_(2)-fiber 活性钎料 微观组织 力学性能
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