Low temperature bonding of LD31 aluminum alloys by electric brush plating Ni and Cu coatings

0Introduction Amongavarietyofbondingtechnologies,vacuum brazinghasbeenwidelyadoptedasareliablemethodfor joiningaluminumcomponents[1],whereintheAl Sialloys systemisrecognizedasthemostpopularfillermetals[2,3]. Althoughasoundjointcanbeachievedforcertainalumi…     

Fabrication of composite wire of lead coated on glass fiber by extrusion

1　INTRODUCTIONCoatingglassfiberwithleadproducesakindofnewcontinuouscomposite ,whichcanfindwideap plicationsinmanydifferentfields ,especiallyinthebatteryoftheEVsandHEVsthathasalreadybecomethemostimportantgoalinmostcountries[13] .Withakindofspecialtechnologythiskindofnewcompos itewirecanbeusedtoproducegridsofnewleadacidbatterythatisveryusefultotheEVsandHEVs .Thiskindofnewleadacidbatteryhasmanyadvan tages ,suchashigherspecificenergy ,lessinnerresis tance ,morequicklychargingcapabilityand…     

压入深度与膜厚对薄膜与基体复合硬度及弹性模量的影响

根据高华建的复合弹性模量模型，提出了用一个测点的载荷-位移曲线计算整个压入深度内薄膜和基体复合硬度分布的方法，探讨了压入深度与膜厚对硬度与弹性模量测量值的影响，指出可由膜-基复合性能反推膜本身的性能。     

弥散Gd_2O_3质点改性的新型复合铝化物涂层的氧化行为SCIEI

研究了Gd_2O_3质点及其添加量对涂层在空气中1100℃氧化行为的影响及作用机制。结果表明,NiAl涂层中加入Gd_2O_3质点后,极大地降低了涂层的氧化速率,显著提高了氧化膜的粘附性,比简单NiAl涂层具有更好的抗高温氧化性能。复合镀层经渗Al后,一部分Gd_2O_3质点仍弥散分布于涂层中,另一部分细小的亚微观质点在涂层/基体界面处富集,形成氧化物聚集带,聚集带具有扩散障作用。连续的聚集带更有效地抑制退化,提高涂层使用寿命。     

对涂料发展史及其系统的探讨

提出了涂料发展的三个时期与四个阶段的理论。同时指出,伴随涂料不断发展过程,发生了四次概念更新。在此基础上,提出了广义涂料概念和涂料大系统的新观点,以及建立涂涂层系统料新的理论体系的设想.     

“金属布”硬质复合涂层的微观组织及性能

用Ｘ射线衍射仪、扫描电镜、摩擦磨损试验等，研究了粉末冶金“金属布”及其钢表面改性技术在钢表面制备的ＷＣ－Ｎｉ系合金复合涂层的微观组织和性能。结果表明：该合金涂层中硬质相的体积含量可大于６０％；涂层的微观组织有两类：一种是在粘结相中均匀分布的碳化物与弥散分布的球状粘结相富集区构成的非均匀结构；另一种是碳化物和粘结相都均匀分布的均匀结构。碳化物分布区的硬度大于Ｈｖ１０７６，粘结相富集区的硬度在Ｈｖ９６７～Ｈｖ４５８之间。涂层与钢基体之间有几～几十微米的界面过渡区，形成剪切结合强度大于４００ＭＰａ的冶金结合。复合涂层的耐磨性明显优于调质Ｔ８工具钢。     

HVOF喷涂NiCr-Cr3C2过程中Laval管壁结瘤成因的探讨

围绕超音速火焰喷涂NiCr-Cr3C2涂层时在Laval管内壁产生结瘤的问题，在分析结瘤产物显微结构的基础上探讨了形成结瘤的原因。研究发现，结瘤产物具有层状组织结构，说明结瘤的形成机制与涂层形成机制相似；在HVOF喷涂时，导致Laval管内壁结瘤的原因主要包括：喷涂材料、喷涂粉末颗粒粒度、喷涂工艺参数、Laval管的内表面粗糙度。     

钢铁构件表面上的无机富锌涂层

阐述了无机富锌涂层的研究、发展、特性和应用，指出无机富锌涂层具有杰出的耐环境侵蚀性能、耐化学性、耐溶剂性、耐辐射性、耐热性，在恶劣腐蚀环境下它是钢结构件的最佳底涂层。     

铝电解槽TiB2涂层阴极技术

将含有ＴｉＢ２、碳纤维和热固性粘结剂的涂料，涂敷到铝电解槽的阴极基体上，制备出可润湿的阴极表面。经固化和碳化后，涂层和碳质基体材料的粘结力强，热膨胀匹配性好。每台硼化钛涂层阴极试验槽能节省ＮａＦ２５０～３００ｋｇ，试验槽的电流效率高出对比槽１．４４％，能耗降低１７５～２１１ｋＷ·ｈ／ｔＡ     

Formation of nanostructured YSZ/Ni anode with pore channels by plasma spraying

YSZ/Ni is the conventionally most used material for making the anode of a solid oxide fuel cell. Agglomerated nanostructured YSZ/NiO powders and plasma spray are applied to produce nanostructured YSZ/NiO coatings on porous support substrates. After reduction in an ambient atmosphere of 7% hydrogen and 93% argon at about 800 °C for 4 hours, a novel SOFC anode with nanostructured characteristics such as nano YSZ particles, nano Ni particles, nano pores and nano pore channels is produced. This new YSZ/Ni anode provides larger triple phase boundaries for hydrogen oxidation reactions. X-ray diffraction patterns of these YSZ/NiO coatings after 1 h of heat treatment at temperatures from 700 to 1100 °C are obtained and Scherrer analysis is conducted to study the effect of temperature on grain size. The results obtained from SEM, TEM, XRD and EDX measurements and analyses are presented in this investigation.