氫化鈦熱分解反應(yīng)動(dòng)力學(xué)與鋁合金熔體泡沫化過程研究

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1、摘要泡沫鋁合金在高技術(shù)和民用領(lǐng)域中有重要應(yīng)用。針對(duì)泡沫鋁合金制各的現(xiàn)存問題，需要揭示發(fā)泡劑氫化鈦的產(chǎn)氣規(guī)律，以供研究和控制鋁合金熔體的泡沫化過程，從而成功制備具有獨(dú)特性能的泡沫鋁臺(tái)金。本文制備了小孔徑(D<1film)、低孔隙率(65％

2、kJ／tool。利用這些理論，結(jié)合定溫預(yù)分解差譜技術(shù)，解疊了氫化鈦的科序升溫?zé)岱纸庾V線．首次求得了氫化鈦熱分解反應(yīng)動(dòng)力學(xué)參數(shù)和動(dòng)力學(xué)方程組。據(jù)此方程組，計(jì)算得到了在940／(時(shí)，氫化鈦的熱分解量對(duì)時(shí)間的天系線，它與鋁臺(tái)金熔體泡沫化過程相吻合．首次為研究和控制鍋臺(tái)金熔體泡沫化過程提供了理論依據(jù)。首次提出了測(cè)定鋁合金熔體泡沫孔結(jié)構(gòu)參數(shù)的“瞬時(shí)凍結(jié)”凝崩法。研究發(fā)現(xiàn)：在一定的攪拌時(shí)間內(nèi)。熔體泡沫的孔隙率保持恒定。在該攪拌時(shí)間范圍內(nèi)，當(dāng)攪拌時(shí)間短時(shí)，待分解的氫化鈦就多，制得的樣晶的孔隙率就大；當(dāng)攪拌時(shí)間長(zhǎng)時(shí)，待分解的氫化鈦就少，制得的樣品的孔隙率就小。據(jù)此規(guī)

3、律，成功地制得了小孔徑(D

4、9982001)、國(guó)家自然科學(xué)基金項(xiàng)目(No．504710

5、31，No．50081002)文中內(nèi)容請(qǐng)勿擴(kuò)散-I·東南大學(xué)博L學(xué)位論義ABSTRACTAIalloyfoamisakindofnewmaterialwhichhasimportantapplicationsinbothhigh-techandciviIfieldsFocountertheexistingprobleminpreparingAIalloyfoam，itisnecessarytorevealtheruleofhydrogenproductionfromthermaldecompositionoftitaniumhydride，which

6、furnishesthebasisforstudyingandcontrollingtheAIalloymeltfoamingprocess，thussuccessfullypreparingAIalloyfoamwithexcellentfeatures．Inthispaper,theAIalloyfoamwithsmallporediameter(D<1mm)lowporosity(65％<尸'<75％)issuccessfullyprepared．Atemperatureprogrammeddecomposition(TPD)apparatus

7、withmetaltubestructure，inwhichArisusedasthecarriergas，isestablished．Itiswe，YANGDonghui，HEDepingandYANGShangrun，whohavefirstlyrecordedtheTPDspectrumoftitaniumhydridebyusingtheTPDapparatusItisthefirsttocompletelyapplytherelatedtheoriesoftemperatureprogrammeddesorption，whichinclud

8、espectrogramsuperpositionmethod，consultingtablemethod(CTM)andisodesorptionratemethod，totemperatureprogrammeddecomposition，andtobroadentheapplicationrangeofCTMtothepeakmaximumtemperature厶=300-1100KandtheactivationenergyEa=100-740kJ／m01．TheTPDspectrumoftitaniumhydrideisseparateda

9、ndsimulatedintoindividualpeaksbyutilizingthesetheories