| 摘要: |
| Ag-Cu钎料中的Mn优先渗透1Cr18Ni9Ti不锈钢上的氧化膜,同钎剂一样与不锈钢表面氧化物相作用,使氧化物变得可以被熔融钎料渗透。钎料熔化时富Mn-Cu熔液超前于主体钎料沿氧化物-钢界面流布。母材金属在富Mn-Cu熔液中的溶解使氧化膜剥离、破碎,为主体钎料的大规模铺展准备了条件。作为Mn氧化反应的结果,真空炉中氧化性气体(主要是O2和H2O)的分压明显降低。 |
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| THE FUNCTION OF MANGANESE IN FILLER METAL IN THE VACUUM BRAZING OF STAINLESS STEEL |
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Zhang Yiqi, Wu Ximeng
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Beijing Aeronautical Manufacturing Technology Research Institute
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| Abstract: |
| As an addition agent to the silver-copper brazing alloy,manganese penetrates with precedence through the oxide film on 1Cr18Ni9Ti stainless steel,and acts as a flux to make steel oxide permeable to the molten filler metal.When melting does occur, the Mn/Cu rich liquid precedes the bulk of molten filler metal and flows along the oxide/steel interface.The dissolving of base metal in Mn/Cu rich liquid makes the oxide film to be easily stripped and broken down,and paves the way for spreading of molten bulk filler metal on a large scale.As a result of manganese oxidations the residual partial pressures of the oxidizing gases in vacuum,mainly oxygen and aqueous vapour,are reduced obviously. |
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