等離子體活化燒結(jié)過程的機(jī)理與應(yīng)用

1、等離子體活化燒結(jié)過程的機(jī)理與應(yīng)用摘要等離子體活化燒結(jié)是一種燒結(jié)時(shí)間短、燒結(jié)溫度低的固結(jié)方法，它融等離子體活化、熱壓和電阻加熱為一體。它通過等離子體活化顆粒表面和快速升溫來提高粉末的燒結(jié)性，從而實(shí)現(xiàn)快速燒結(jié)。本論文對(duì)目前主要燒結(jié)方法和等離子體活化燒結(jié)法的新應(yīng)用進(jìn)行了綜述，分析了等離子體活化燒結(jié)法的優(yōu)點(diǎn)和研究方向，確定了機(jī)理研究的路徑。研究了等離子體活化燒結(jié)設(shè)備和工藝路線?；罨薟CCoA1203WCCu粉，對(duì)比了活化前后材料微觀結(jié)構(gòu)的異同

2、，分析了原因，提出了等離子體活化模型，主要包括三個(gè)模型，同普通電阻加熱燒結(jié)相比，等離子體活化具有特殊的效果。采用等離子體活化燒結(jié)法燒結(jié)了A1203Zr0:納米粉和WCCo以及Cu粉，該方法在工藝參數(shù)和產(chǎn)品性能方面均優(yōu)于傳統(tǒng)燒結(jié)、微波燒結(jié)和微波等離子體燒結(jié)法。在機(jī)理探討上，主要從熱力學(xué)和動(dòng)力學(xué)入手，分析了等離子體活化燒結(jié)的本質(zhì)。關(guān)鍵詞:等離子體活化燒結(jié)，納米級(jí)A1203，納米級(jí)ZrOzCuWCCoMechanismApplicationo

3、fPlasmaActivatedSinteringProcessingStudent:IiboZhangSupervis:Prof.JinhuiPTNGFacultyofMaterialsMetallurgicalEngineeringKunmingUniversityofScienceTechnologyAbstractPlasmaActivatedSintering(PAS)isashttimehightemperaturedens

4、ificationprocessbasedonthreemaincontributions:plasmagenerationpressureapplicationresistancesintering.Itisanewrapiddensificationprocessthathasthepotentialtominimizethegraingrowthbyenhancingparticlesinterabilitythroughpart

5、iclesurfaceactivationrapidheating.InthispapermajsinteringprocessingNev.%applicationofplasmaactivatedsinteringhavebeenreviewed.Theadvantagesthedirectionofresearchofplasma‘a(chǎn)ctivatedsinteringhavebeenanalyzed.Theresearchmeth

6、odofmechanismhasbeendetermined.Theequipmentprocessingofplasmasinteringwereinvestigated.昆明理工大學(xué)碩士學(xué)位論文(縮寫本)“.......................................................93.13實(shí)驗(yàn)方案.”“””””””””””””””””““““““““..…，.”””“….“:.““.””.”.””

7、”““”..“..““......…….“...….3.2實(shí)驗(yàn)結(jié)果與分析.””””””””””””“”””“”“..“:.””””””””“..”“….”””””””””“”““:.”““….….“..…103.3機(jī)理模型的提出.””..”””””:.”””””””..“”““二“..“.“，..…”””””..““““…“…”…”.”.”二”..””:.”:.””…1l3.3.1電流流經(jīng)顆粒模型.“.…“..““….“..….””””

8、””:.“““““….”””””””””““:.”:.“:.“““““….….I13.32活化粉末粒子對(duì)模型二”.”.”:.”.”””””..”“““““….””””.”:.””””“......……”..……”113.33多點(diǎn)放電模型............….….””..”..”””””””””““….“.….”””””””””“““““““.”“““..“.“““““:..1233.4脈沖電壓的獨(dú)特活化效果.”””.”””””“.

9、...…“.，.…””””””””“..““..“:.“二“.......................134活化燒結(jié)材料.““..“““““.”..“””“”..”””“….”””””“””..”….….“”””””””””””“”“”..”:.“...….“..“..….“”……134.I燒結(jié)材料的用途和性質(zhì)..“..“.”““““““:.”…””””””:.”””“:.“““……”….”:.”””.””””””二””..”:..

10、144.2納米級(jí)Al眾的燒結(jié)及其性能二“….””..””.”””””””““..”“”“..””:.””””””””””””””””””””1442.I不同顆粒尺寸氧化鋁的相對(duì)理論密度隨時(shí)間的變化關(guān)系二”...........................14422相對(duì)密度與維氏硬度之間的關(guān)系…….””””””:.“:.““:.““““.“..“.....….…““...…“““.巧423冊(cè)中燒結(jié)方法的比較“.............

11、..................................................................................................1542.4燒結(jié)后微觀結(jié)構(gòu)分析.”””””””””””..““….“:.“..“”..….”””..”一””””””””””............…….154.3WC6%Co的燒結(jié)..”..“..….….”“””””“:.”““““”..“.

12、.““:.””””:.”.””””.”””””::..”.”…”….“.…”.164.3.1成形壓力與相對(duì)密度的關(guān)系.“”“..““..…””:.”””..”:.。.””二””””””””””””.……，.””….…16432燒結(jié)時(shí)間與相對(duì)密度和洛氏硬度的關(guān)系....一””..”二”...二”............……“.““..….“.164.4WC10%Co燒結(jié)，.“““””..“.”””..””””””””””.””””””””

13、.””“”””“:.”.””.”””“….””””””””””..””.….174.5WC15%Co的活化燒結(jié).””:.“””..”.，“”“…””..””..”二””..”..”””””””.”””””..............….…””:.184.6WC20%Co的活化燒結(jié)................................................................................

14、....................................194.7納米級(jí)西q的燒結(jié)..............................................................................................................................204.7.1等離子體活化燒結(jié)與微波等離子體燒結(jié)納米z的比較...............