本文對用SPS法通過熔融LiAlSiO4制備a-Si3N4和用簡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)。近來人們通過液相燒結(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

【文章頁數(shù)】：67 頁

【學(xué)位級別】：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：2963950

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