(桂林電子科技大學(xué) 信息材料科學(xué)與工程系，桂林 541004)
摘 要: 用真空熱壓燒結(jié)法制備AlN/堇青石玻璃陶瓷復(fù)合材料。分析復(fù)合材料樣品的相對(duì)密度、抗彎強(qiáng)度和斷裂韌度與AlN含量及燒結(jié)溫度的關(guān)系，并對(duì)其顯微組織與力學(xué)性能進(jìn)行研究。結(jié)果表明：樣品的相對(duì)密度隨AlN加入量的增加逐漸下降；樣品的抗彎強(qiáng)度和斷裂韌度隨燒結(jié)溫度的升高而增加，隨AlN加入量的增加呈先升后降的變化趨勢(shì)；當(dāng)AlN體積分?jǐn)?shù)為0.40時(shí), 復(fù)合材料樣品的抗彎強(qiáng)度和斷裂韌性達(dá)到最大值，分別為212 MPa和3.04 MPa∙m1/2。XRD分析表明：AlN與堇青石玻璃未發(fā)生化學(xué)反應(yīng)，化學(xué)相容性好。斷口形貌和壓痕裂紋擴(kuò)展路徑的掃描電鏡觀察結(jié)果表明，復(fù)合材料的強(qiáng)化機(jī)制主要是載荷傳遞，增韌機(jī)制主要為裂紋的繞道偏轉(zhuǎn)、分叉和釘扎與顆粒的拔出
關(guān)鍵字: AlN顆粒；堇青石玻璃；復(fù)合材料；微結(jié)構(gòu)；力學(xué)性能
（Department of Information Materials Science and Engineering,Guilin University of Electronic Technology, Guilin 541004, China）
Abstract:AlN/cordierite glass-ceramic composites were prepared by vacuum hot-pressing process. The relative density, flexural strength and fracture toughness of the composites as a function of the content of AlN and sintering temperature were investigated. The mechanical properties and microstructure of the composites were also studied. The results show that the relative density of the samples decreases slowly with the addition of AlN. The flexural strength and fracture toughness of the samples increase with rising firing temperature. However, they increase firstly and then decrease with increasing AlN content. The flexural strength and fracture strength of the composites doped with 40%AlN(volume fraction) reach 212 MPa and 3.04 MPa∙m1/2, respectively. XRD analysis indicates that no chemical reaction occurs between the cordierite-based glass matrix and AlN particles, which suggests that the glass matrix have excellent chemical compatibility with AlN particles. The main strengthening mechanism is load transfer. And the main toughening mechanisms are deflexion, divarication and transfixion as well as AlN particles pulling out.
Key words: AlN particles; cordierite glass; composites; microstructure; mechanical properties
