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1、河南科技大學(xué)畢業(yè)設(shè)計(jì)(論文)ZnO-TiO2納米粉體和微波介質(zhì)陶瓷的制備及性能研究摘要低溫共燒陶瓷技術(shù)(LTCC)的核心是研制能與高導(dǎo)電率Ag或Cu電極共燒的微波介質(zhì)陶瓷。目前國(guó)內(nèi)外研究最多、最常用的低溫化方法是摻加適當(dāng)?shù)难趸锘虻腿埸c(diǎn)玻璃等燒結(jié)助劑、選擇固有燒結(jié)溫度低的微波介質(zhì)陶瓷材料、采用納米粉粒促進(jìn)燒結(jié)溫度的降低。近年來,由于ZnTiO3具有優(yōu)良的微波介電性能性能和相對(duì)較低的固有燒結(jié)溫度,因而其粉體的制備廣受關(guān)注,ZnO-TiO2系各種相轉(zhuǎn)變比較復(fù)雜,而且相的形成機(jī)理和數(shù)量多少對(duì)原料配比,燒成工藝及處理方法等因素非常敏感。ZnTiO3的制備方法眾多,可采用諸如So
2、l-Gel法、熔鹽法等液相工藝成功合成其單相粉末的研究也屢見報(bào)道,水熱條件合成ZnTiO3單相粉末的報(bào)道還未出現(xiàn)。與其他方法比較,水熱法具有粉體結(jié)晶良好,分散性好,純度高,顆粒均一,分布單一等優(yōu)點(diǎn),廣泛用于納米級(jí)粉體的合成。本文以TiCl4和ZnCl2為主要原料,采用水熱條件合成ZnO-TiO2復(fù)合氧化物,然后用傳統(tǒng)固相法合成偏鈦酸鋅(ZnTiO3)陶瓷粉末,并用XRD和SEM對(duì)其組織結(jié)構(gòu)和形貌進(jìn)行了表征。結(jié)果表明,水熱合成粉末粒度小活性大,在650℃煅燒就能合成ZnTiO3相,通過800℃煅燒可以轉(zhuǎn)變?yōu)榧兞絑nTiO3鈦鐵礦相,避免了Zn2Ti3O8相的生成。納米顆
3、粒能顯著降低陶瓷的燒結(jié)溫度,增加其反應(yīng)活性,提高其體積密度、介電性能、品質(zhì)因素,同時(shí)降低其介質(zhì)損耗,在1100℃燒結(jié)時(shí),其致密度可以達(dá)到4.196,陶瓷的微波介電性能為:介電常數(shù)εr=57.922,品質(zhì)因數(shù)Q﹒f=17574.87GHz,介電損耗tgδ=3.05×10-4,很有實(shí)用價(jià)值。關(guān)鍵詞:水熱法,固相法,鈦酸鋅,低溫共燒,介電性能21河南科技大學(xué)畢業(yè)設(shè)計(jì)(論文)ZnO-TiO2nano-powderandthemanufactureandpropertyresearchofmicrowavedielectricceramicsABSTRACTThekeytechn
4、ologyofLTCCisdevelopmentofmicrowavedielectricceramicswhichcanbeco-firedwithhigh-conductivitymetalelectrodesuchasAgorCu.Atnow,themostcommonlyusedtolowtemperaturemethodathomeandabroadisbyaddingappropriateoxideorlowmeltingpointglass,sinteringadditivesshouldchooseinherentlowsinteringtemperat
5、ureofthemicrowavedielectricceramicmaterialsandalsocanusenanometerpowdertopromotelowertemperature.Inrecentyears,duetotheZnTiO3withexcellentmicrowavethedielectricpropertiesoftheperformanceandrelativelylowinherentsinteringtemperature,sothepowderpreparationofthecontroversial,thephase’schange
6、ofZnO-TiO2ismorecomplex,andtheformationmechanismofthephaseandthenumberoftheratioofrawmaterials,firingtechnologyandprocessingparametersareverysensitive.ThepreparationmethodoftheZnTiO3numerous,canusesuchasSol-Gelmethodplasma-nitridingmethod,thesyntheticliquidprocesssuccessthestudyofsinglep
7、hasepowderrepeatedlyreported,waterheatconditionsynthesisZnTiO3single-phasepowderreportshadnotbeenheard,butothermethodismore,hydrothermalsynthesishasthepowdercrystallizationisgood,gooddispersion,highpurity,uniformparticles,suchasthedistributionofasingle,widelyusedinthesynt