本文對(duì)用SPS法通過(guò)熔融LiAlSiO4制備a-Si3N4和用簡(jiǎn)單的溶膠凝膠法制備LiYO2進(jìn)行了研究。盡管具有高強(qiáng)度、低膨脹系數(shù)、耐高溫沖擊和耐化學(xué)腐蝕等優(yōu)良的熱力學(xué)性能,但是由于Si-N之間具有強(qiáng)的共價(jià)鍵從而導(dǎo)致低的擴(kuò)散系數(shù),致密化氮化硅的制備依然是一個(gè)不小的挑戰(zhàn)。近來(lái)人們通過(guò)液相燒結(jié)增加物質(zhì)的傳輸性制備了接近于理論密度的氮化硅陶瓷。然而,高成本的添加劑和高的燒結(jié)溫度限制了氮化硅基陶瓷的應(yīng)用。因此,高效低成本地制備燒結(jié)助劑和最終產(chǎn)物的后續(xù)研究成為了我們的主要課題。本論文中,我們用溶膠凝膠法制備了釔氧化鋰（LiYO2）,用固相法制備了硅酸鋰鋁（LiAlSiO4）,這兩種材料是中溫陶瓷燒結(jié)重要的添加劑材料。事實(shí)上LiYO2是一種具有碳吸附能力和防暴曬涂層應(yīng)用的環(huán)境友好型材料。它是用鋰含量高的前軀體制備的,相比于固相合成反應(yīng),這種前軀體可以在更加低的溫度下燃燒溶膠凝膠法制備的無(wú)定形粉末從而得到高純的LiYO2粉末。950℃保溫6小時(shí),Li（CH3COO）·2H2O和Y（NO3）3·6H2O的摩爾比為2以及1000℃保溫6小時(shí),Li（CH3COO）·2H2O和Y（NO3）3·6H2O的摩爾... 

【文章來(lái)源】：武漢理工大學(xué)湖北省 211工程院校 教育部直屬院校

【文章頁(yè)數(shù)】：67 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
中文摘要
Abstract
Chapter 1:Introduction and Literature Review
    1.1 Introduction
    1.2 Literature review
3N₄">        1.2.1 Crystal structure of Si₃N4

        1.2.2 Sintering and mechanical performance
            1.2.2.1 Particle rearrangement
            1.2.2.2 Solution-reprecipitation
            1.2.2.3 Final densification or solid-state sintering
    1.3 Objective of this study
    1.4 Contents of this study
Chapter 2:Experimental Techniques and Methods applied
    2.1 Raw and starting precursors materials
    2.2 Experimental methods
        2.2.1 Samples preparation
2">            2.2.1.1 Sol-gel preparation of LiYO₂

            2.2.1.2 Solid-state preparation of LiAlSiO₄ glass powder
4 glass">            2.2.1.3 Preparation of nano-powder of LiAlSiO₄ glass
3N₄/LiAlSiO₄ composite material">            2.2.1.4 SPS preparation of Si₃N₄/LiAlSiO₄ composite material
        2.2.2 Performance and structural characterization techniques
            2.2.2.1 X-ray diffraction
            2.2.2.2 Morphology and microstructure analysis
            2.2.2.3 Particle size distribution
            2.2.2.4 Thermal analysis
            2.2.2.5 Infrared spectroscopy
            2.2.2.6 Density
            2.2.2.7 Hardness and fracture toughness
4 and LiYO₂">Chapter 3:Preparation of Additives:LiAlSiO₄ and LiYO₂

    3.1 Sol-gel synthesis and characte rization of LiYO₂

        3.1.1 Experimental procedure
        3.1.2 Results and discussion
            3.1.2.1 Thermal characterization
2">            3.1.2.2 FT-IR characterization of LiYO₂

            3.1.2.3 XRD characterization
            3.1.2.4 SEM characterization
        3.1.3 Conclusion
4">    3.2 Solid-state preparation of LiAlSiO₄

        3.2.1 Experimental procedure
        3.2.2 Results and discussion
            3.2.2.1 Phase characterization
            3.2.2.2 Morphology and particle size distribution
        3.2.3 Conclusion
3N₄/LiAlSiO₄ Composite material">Chapter 4:SPS Sintering of Si₃N₄/LiAlSiO₄ Composite material
    4.1 Densification and mechanism
        4.1.1 Effect of temperature
        4.1.2 Effect of pressure
        4.1.3 Fracture surface
    4.2 Performance of sintered samples
3N₄">    4.3 Extent densification and the α/β transformation in Si₃N₄

    4.4 Influence of holding time
    4.5 Conclusion
Chapter 5:General Conclusion and Recommendations
    5.1 General conclusions
    5.2 Recommendations
References
SITUATION OF PAPER PUBLISHED DURING THE MASTER DEGREE PROGRAM
ACKNOWLEDGEMENT



本文編號(hào)：2963950

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