共查询到18条相似文献,搜索用时 15 毫秒
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通过热重分析和差热分析并结合 X射线衍射技术对 Ir O2 +Ta2 O5 混合氧化物的热形成进行了研究。结果表明 :摩尔分数 x<2 5 %时 ,在混合氯盐体系 x H2 Ir Cl6 +(1- x)Ta Cl5 中 ,热解产物中的固溶体为β相 (β- Ta2 O5 中固溶了 Ir组元 ) ;x≥ 2 5 %时 ,生成的固溶体为固溶了 Ta组元的 Ir O2 金红石相 ,而且数量在两个以上 ;只有当 x≥ 42 .86 %时 ,其中的金红石相固溶体才是稳定的。 Ir和 Ta组元在热解过程中相互促进的作用强度顺序为 :x=5 .2 6 % x=6 6 .7%。在低 Ir含量 (x=5 .2 6 % )下或低 Ta含量 (x=6 6 .7% )体系中 ,在高温下主组元的热解受第二组元所抑制 相似文献
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制备条件对钛基IrO2+Ta2O5涂层阳极性能的影响 总被引:7,自引:0,他引:7
研究了基体喷砂处理,涂制母液溶剂体系,添加剂等制备技术对热分解法制备钛基IrO2 Ta2O5阳极组织结构,性能的影响,结果表明,基体经喷砂处理后与氧化物涂层间的结合力加大,其阳极寿命明显提高,采用有机溶剂制备的涂层表现出典型的裂纹形貌,且晶粒细化,增大了阳极的电化学活性表面,从而提高了阳极的析氧电催化活性,加入适量添加剂可以改善涂层的致密度,能够有效地抑制活性组元的溶解,并阻止电解液在涂层中的渗透,延长了阳极的使用寿命,实验表明,添加剂含量为0.7%时改善效果最为明显。 相似文献
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1.IntroductionTitaniumbasednoblemetalokidecoatingshavebeenwidelyinvestigatedsincethepast3oyears[l':].Inthisperiod,variousmirtures,compositiollswerepreparedanddifferentmulti-coatingprocessesweredevelopedaselectrodematerialsinelectrochemicalfieId.Inbinaxysystems,thecoatingsof7Omol%IrO2 3Omol%Ta2O5wereverifiedtopossessthemaximumactivityanddurabilityforoxygenevolutio.[3'4],Iroz Taosdepositshavebeenstudiedentensively;ThehighstabilityofthisbinarymixturecouldbeattributedtotheformationofIro2baseds… 相似文献
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对IrO2/Ti、SnIrO2/Ti、引进阳极3种涂层阳极的组织、结构、电化学性能、抗钝化性能进行了研究,并着重分析了Sn元素在涂层中所起的作用,结果表明添加Sn的IrO2/Ti阳极具备优异的电催化及抗钝化性能的结论,可作为硫酸中使用的电极材料. 相似文献
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采用Pechini方法制备不同Sn含量的Ti/IrO2-Ta2O5-SnO2纳米氧化物阳极,并运用SEM、EDX、XRD等分析手段和析氧电位、循环伏安、强化电解等方法对阳极的表面形貌、微观结构和电化学性能进行研究。结果表明,制备的氧化物涂层由(IrSn)O2固溶体和非晶态的Ta2O5构成,组成与名义成分基本一致。随着Sn含量的增加,氧化物涂层表面裂纹增多。Sn的加入使Ti/IrO2-Ta2O5-SnO2氧化物阳极的析氧电位升高,稳定性降低。 相似文献
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LI Ying WANG Xiaotian JIN Zhihao Xi''''an Jiaotong University Xi''''an China SHl Guoshun Beijing Measuring Analysing Center.Beijing China 《金属学报(英文版)》1992,5(12):516-520
The effect of subzero treatment on the microstructure and mechanical properites of Y_2O_3-ZrO_2 ceramic have been investigated by TEM,X-ray diffraction and test of mechanicalproperties.It was shown that the microstructre of 3Y-PSZ after subzero treatment byliquid nitrogen exhibits very long and parallel laths of m-phase and some microcracksaround the larger and finer lath of m-phase may be discovered.Suitable subzero treatmentcan improve the strength and toughness of Y-PSZ efficiently because of decreasing thestability of t-phase and incresing the amount of t-m transformation when exerting astress.However,when the time of subzero treatment exceeds,the over aging effect mayarise.which can decrease the strength and toughness of the material. 相似文献
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探讨了两种不同的WC添加方式对Cr3C2基硬质合金组织与性能的影响。结果表明,与WC以单一碳化物形式在湿磨时加入相比,WC以Cr3C2—WC复式碳化物形式加入,制备的合金晶粒较细、抗弯强度较高。 相似文献
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Z.T.Yu ) L.Zhou) ) J.Deng) H.C.Gu) ) College of MaterialScience Engineering Xi’an Jiaotong University Xi’an China ) NorthwestInstitute for Nonferrous Metal Research P. O.Box Xi’an China 《金属学报(英文版)》1999,12(4):585-590
1.IntroductionTi2Al25Zr(singleαTialloy)anditstubeproducts,whichpossesseslowstrength,highplasticity,higherosionresistantandgoodweldabilityandsoon〔13〕.Itcanapplyinhightemperature,highpressureandseawaterenvironmentforlongterms.Soitespeciallyapplyto… 相似文献
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CHEN Zhaoyou TIAN Shouxin Luoyang Institute of Refractories Research Ministry of Metallurgical Industry Luoyang China 《金属学报(英文版)》1989,2(12):416-421
Simulative study on corrosion of Al_2O_3-C refractories by mold cover flux has been carried outby means of immersion method.The results show that there fractory exhibits best resistance tothe flux corrosion while the ratio of additive Al and Si is approximately equal to one.In addi-tion,ZrO_2-C specimens exhibit better corrosion resistance to mold cover.flux than Al_2O_3-Cspecimens. 相似文献
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以TiB2颗粒和SiC晶须对Al2O3陶瓷进行增韧补强,采用热压法同时了制备了Al2O3,Al2O3/TiB2和Al2O3/TiB2/SiCw三种陶瓷材料,研究了TiB2颗粒和SiC晶须对Al2O3陶瓷材料的力学性能和微观结构的影响。结果表明;因TiB2的加入可明显改善Al2O3。陶瓷材料的强度、硬度和韧性;而TiB2颗粒和SiC晶项协同对Al2O3进行增韧补强可使其断裂韧性显著提高。Al2O3/TiB2陶瓷材料的主要增韧机理有;TiB2粒子的针扎作用和使裂纹产生偏转;而Al2O3/TiB2/SiCw陶瓷材料的主要增韧机理有:晶须拔出、裂纹桥接和裂纹偏转。 相似文献
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本文采用现场浸棒法与实验室中频感应炉浸棒法对Al和Si含量不同的Al_2O_3-C材料以及ZrO_2-C材料进行了抗保护渣侵蚀试验。结果表明,Al和Si的加入量之比为1时,Al_2O_3-C材料抗保护渣侵蚀性最好,但还不及ZrO_2-C材料。 相似文献
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L.Z. Song S.Z. Song J. Zhao 《金属学报(英文版)》2006,19(2):117-123
A NiP/TiO2 composite film on carbon steel was prepared by electroless plating and sol-gel composite process. An artificial neural network was applied to optimize the prepared condition of the composite film. Corrosion behavior of the NiP/TiO2 composite film was investigated by polarization resistance measurement, anode polarization, ESEM (environmental scanning electron microscopy) and EIS (electrochemical impedance spectroscopy) measurements. Results showed that the NiP/ TiO2 composite film has a good corrosion resistance in 0.5mol/L H2SO4 solution. The element valence of the composite film was characterized by XPS (X-ray photoelectron spectroscopy) spectrum, and an anticorrosion mechanism of the composite film was discussed. 相似文献
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用动电位扫描法研究了有无外磁场时纯铁在Fe2(SO4)3和H2SO4+Fe2(SO4)3溶液中的阴极极化曲线,没有外加磁场时,Fe^3+还原反应与H^+去极化反应有相互促进作用,在单纯H2SO4溶液或单纯Fe2(SO4)3溶液中,外加0.4T磁场均加速铁的阴极过程,但不改变反应进行的机制;在H2SO4+Fe2(SO4)3溶液中磁场对铁阴极过程的加速作用是磁场对Fe^3+还原和对氢离子去极化反应作用 相似文献