铝熔体与氢的相互作用

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1、山东大学硕士学位论文ABSTRACTItiswellknownthatthequalityofaluminumalloyshasmuchtodowiththehydrogencontentinthealloys.The叮dehydrogenationofaluminumalloysisthenhighimportancetostudy.Inthisthesis,aseriesofexperimentshavebeenmadetostudytherelationbetweenhydrogenandaluminummelts.Theoreticala

2、nalysisbasedontheseexperimentshasbeenalsogivenhereinorderthatamacroscopicrelationbetweenhydrogenandaluminummeltscanberevealed,andthatagoodfoundationcanbelaidforfurtherstudyofdehydrogenationtechnology.Quantitativecorrelationsofhydrogencontentwithmeltingtemperature,meltingtime,

3、impuritiesandtheenvironmentalhumidityhavebeeninvestigated.SomeexperimentalmethodslikedehydrogenationtechnologyunderavacuumcircumstanceandthecombineddehydrogenationtechnologyofgaseousnitrogentogetherwithSDJ一1fluxhavebeenexclusivelydiscussed.Theexperimentsindicatethathydrogenco

4、ntentinthealuminummeltswillincreaseastemperatureincreasesandtheincrementwillnotbesohigh.Theimpuritieswillhoweverdecreaseastemperatureincreases.Thecontentofhydrogeninmeltswillincreasewhenthemeltingtimeisprolonged.Inspectionontherelationbetweenimpuritiesandhydrogencontentinmelt

5、sdeducesthatmostofhydrogenentersthemeltsbywayofimpurities.Ahighimpuritycontentcorrespondsalwaystoahighhydrogencontentinmoltenaluminumalloys.Itisalsofoundintheexperimentsthathigherhumidityandoverheatingwillincreasethecontentofhydrogen,山东大学硕士学位论文especiallytheinfluenceofhumidity

6、.Uponthisfact,meltingaluminumalloysinvacuumisstudied.Withvacuityincreasing,thecontentofhydrogeninaluminummeltswilldecreaseanditwillreachafairlylowlevel.Similarly,nitrogenandSDJ一1fluxcanalsoreducethecontentofhydrogeninaluminummeltsandobtainasatisfactoryeffectofdehydrogenation.

7、Thediffusionofhydrogenandoxidescomprisesalsoanimportantpartofthispaper.Thedehydrogenationprocessisalsoexploredfromatheoreticalview.Aprincipleoftheseparatingspeedofdehydrogenationisgiven.Throughexperimentalandtheoreticalanalysis,amacroscopicconceptisproposedhere,i.e.parameterR

8、for`HydrogenResistance'，whichgivesagooddescriptionofmacroscopicmovem