简介:采用纯Cu粉、Cu-2Zn粉、Cu-2Fe粉、Cu-2Zn-2Fe粉等4种不同成分的渗铜剂,以Fe-Cu-C烧结钢为基体,在1120~1150℃、保温30min工艺下渗铜,研究不同成分渗铜剂的熔渗性能及其对渗铜烧结钢力学性能的影响。结果表明:同其它3种渗铜剂相比,Cu-2Zn-2Fe渗铜剂渗铜性能最好,烧结钢渗铜后表面质量均匀一致、无溶蚀现象;上下表面硬度基本一致,较未渗铜烧结钢提高了约60%;4种渗铜剂渗铜的烧结钢冲击韧性为13.7~14.0J/cm^2,较未渗铜的提高2倍以上;在渗铜剂中,Fe元素可以降低渗铜剂熔体活性、增加黏度;Zn元素可以降低渗铜剂熔体黏度、增加其活性。
简介:目的:确定中药抗溃疡性结肠炎生物黏附剂中所选用促渗剂的种类及其用量。方法:采用大鼠在体灌流模型处理灌肠液,并采用HPLC法测定秦皮甲素在灌肠液中的含量。结果:0.5%,1%,2%,3%,4%,5%的薄荷脑作为促渗剂时,秦皮甲素的吸收度分别为0.015742,0.022566,0.016520,0.014586,0.012946,0.012818μg.mL-1.cm-1;0.5%,1%,2%,3%,4%,5%的冰片作为促渗剂时,秦皮甲素的吸收度为0.015664,0.016067,0.013753,0.012597,0.011899,0.011449μg.mL-1.cm-1。结论:薄荷脑和冰片对灌肠Ⅰ号中秦皮甲素都有较强的促渗透作用,1%薄荷脑及1%冰片对秦皮甲素的促透作用最明显。两药比较,薄荷脑的促透效果更强。
简介:中原油田属高温高盐油藏,常规三次采油技术难以满足提高采收率的要求。以非一阴离子两性表面活性剂为主剂的驱油剂与原油可形成超低界面张力,与储层流体适应性好。当表面活性剂用量为0.3%时,驱油剂吸附量小于1.5mg/g,耐温100℃,抗盐20×10。mg/L(ca。^2++Mg^2+含量6000mg/e)。注入0.2PV表面活性剂,可提高采收率7.88%。该驱油剂可以在中原油田大规模应用。
简介:摘要:本文结合企业实际生产,对生产出的铁路混凝土梁预埋钢构件的耐蚀性能及机械性能进行测试,结果表明,在有多元合金共渗层后,铁路混凝土梁预埋钢构件的耐蚀性能得到了极大的改善,并使铁路混凝土梁预埋钢构件的免修期得以延长,从而降低了桥梁的养护工作量,降低了养护成本,消除了安全隐患。
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简介:AnomalousLeakageCurrentinSilicon0xynitrideThinFilmsGrownbyMicrowaveExcitedNitrogenPlasmaNitridation.Applicationoftheexplosivemethodforcreatingnitrogenlayers;Brightplasmanitridingofferriticsteelwithseveralalloyingelements;Cleaningasthemostimportantsteptowardssuccessfulheattreatment
简介:Developmentandpracticalapplicationofborideasengineeringceramics;Developmentandpracticalapplicationofborideasengineeringceramics;Effectofboronmicro-alloyingonmicrostructureandmechanicalpropertiesoffine-grainedCM247LCsuperalloy;Effectsofmetallicelementsonthermoelectricpropertiesofsiliconborides
简介:[篇名]ActivatedMigrationSintering,[篇名]Activationofsteelsurfacesbyoxynitriding,[篇名]Activescreenplasmanitridingtechnology,[篇名]AdvancedPlasmaNitridingforAluminumandAluminumAlloys,[篇名]Ananti-corrosionandwear-resistingcompoundingnitridedlayeronprecisepressedpartsofsoftsteels,[篇名]Anexperimentalstudytocorrelatewaterjetimpingementerosionresistanceandpropertiesofmetallicmaterialsandcoatings,[篇名]AnInfluenceofSonBombardingontheEffectsofNitridinginD.C.GlowDischargePlasma。