ly12铝合金中温钎焊技术的研究

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1、机械科学研究院哈尔滨焊接研究所硕士学位论文摘要本文采用中湿钎焊技术，利用改进型CsF。A1F3无腐蚀性钎剂配合Ag—A1一X—Y钎料、A1．Si-Y(1)钎料和A1．Si．Y(2)钎料实现了对LYl2铝会金懿中温钎爆连接。避免-rLYl2铝合金在锤焊过程中容易产生的母材易过烧、钎缝腐蚀等缺陷。在实现了对LYl2销合金中溢钎绰连接盼基础上，通过对LYl2铝合金中激钎焊工艺参数的研究，发现搭接薅积为60～70mm2，采用496～503℃加热保温15min，并采用随炉冷至450℃后空冷的冷却办法，接头躲力学性戆羧佳，满足锊缝鲍力学性熊麓要求。改进型Cs

2、F．A1F3无腐蚀性钎剂能很好的去除LYl2锅合金表面氧化膜，怒实现LYl2锅合金中温锊霹连接翰技术关键。通过对改进型CsF-A1F，无腐蚀性钎剡去除LYl2铝合金表殛的氧化膜机制的研究，发现了CsF是去膜关键化合物，提出改进型CsF．A1F3无腐蚀性钎刹其舂燕活性瓣原因与NH4F、Nil。A1F。及复合盐熔体等纯合物的存禚有关，它们的存在可提高改进型CsF．A1F3钎剂的去膜能力，而HF的生成粥是诱发和夯掰速反应、提高溶解去膜能力的关键。结合中温钎烘技术在AI／Cu管上的应用挪改进型CsF-A1F3无腐蚀性钎剂囱身的特点，提出了CsF．A1F3

3、无腐蚀性钎剂在其它行业同榉鼷有缳大的裂麓价值，应冤前景十分广阔。综合本文的全部研究工作，发现～及Al合金的中温钎焊技术具有广阔的应用前景。关键词：LYl2锚金金；CsF．A1F3钎剂；A1／Cu警；中温钎焊机械科学研究院哈尔滨焊接研究所硕士学位论文StudyonBrazingTechnologyforLYl2aluminumalloyatMiddle——rangeTemperatureABSTRACTThetechnologyforbrazingLYl2aluminumalloyatmiddle-rangetemperaturebymeansof

4、theimprovedCsF-A1F3non-corrosivefluxmatchingAg—A1一X-Y，A1-Si-Y(1)andA1-Si-Y(2)fillermetalispresentedinthisthesis．Thedefectsincludingtheover-heatedstructureofbasemetalandthelowercorrosionresistanceofbrazedseam，whichusuallytakeplaceduringbrazingprocess，couldbeeliminatedcompletel

5、y．AfterthesoundbrazedjointofLYl2alloyatmiddle-rangetemperatureisobtained，furtherdetailedanalysisofthebrazingparametersrevealsthattheoptimizedjointcanbeproducedatthebrazingtemperature496～503。C，dwelltime15minandthelaparea60～．70mm2followingwithcoolingto450。Cinthefurnaceandthento

6、roomtemperatureinair．Thebrazedjointmeetstheneedoftherequiredmechanicalproperties．ItisthecorepointtoaccomplishthebrazingLYl2alloywellatmiddle-rangetemperaturethattheimprovedCsF-A1F3non．corrosivefluxCanremoveeasilythecomplicatedoxidefilmonthesurfaceofLYl2aluminumalloy．Fromthere

7、searchonthemechanismoftheimprovedbrazingfluxCsF-A1F3removingtheoxidefilmofLYl2alloy，itisfoundthatthecompoundCsFplaysakeyroleinremovingtheoxidefilm．ThehighactivationofthebrazingfluxisrelatedtothepresenceofcompoundNH4F，NH4A1F4aswellasothermeltedsalts．Thatis，theabilitytoremoveth

8、eoxidefilmbytheIl枫撇科学礴究端蹬尔滚蜉接研究所硕士学位论文fluxcarlbeenhancedowingtotheim