低温热压制备高硬度、高韧性Si_(3)N_(4)-SiC_(w)-ZrB_(2)陶瓷  被引量:1

High Hardness and High Toughness Si_(3)N_(4)-SiC_(w)-ZrB_(2) Ceramics Prepared by Low-Temperature Hot Pressing

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作  者:陈志伟 郭伟明[1] 罗嗣春 林华泰 CHEN Zhiwei;GUO Weiming;LUO Sichun;LIN Huatai(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区:[1]广东工业大学机电工程学院,广州510006

出  处:《硅酸盐学报》2022年第6期1527-1532,共6页Journal of The Chinese Ceramic Society

基  金:国家自然科学基金面上项目(5217020162)资助。

摘  要:通常低温热压烧结的Si_(3)N_(4)陶瓷具有较高的硬度和较低的断裂韧性;而高温热压烧结的Si_(3)N_(4)陶瓷具有较低的硬度和较高的断裂韧性。为了获得高硬度、高韧性Si_(3)N_(4)陶瓷,添加20%SiC_(w)(SiC晶须,体积分数)和2.5%ZrB_(2),在1500℃低温热压制备了Si_(3)N_(4)基陶瓷,开展其相组成、致密度、显微结构和力学性能研究,并与1800℃高温热压烧结Si_(3)N_(4)进行了对比研究。结果表明:SiC_(w)的引入阻碍了Si_(3)N_(4)低温致密化,致密度从97.9%降低到92.9%,Vickers硬度从20.5 GPa降低到16.4 GPa,断裂韧性从2.9 MPa·m^(1/2)增加到3.4 MPa·m^(1/2)。同步引入SiC_(w)和ZrB_(2),则促进α-Si_(3)N_(4)向β-Si_(3)N_(4)的相变,致密度仍在97.5%,硬度和韧性分别为20.7 GPa和5.1 MPa·m^(1/2)。与低温烧结Si_(3)N_(4)陶瓷相比,Si_(3)N_(4)-SiC_(w)-ZrB_(2)陶瓷的硬度未降低,而韧性大幅提升;与高温烧结Si_(3)N_(4)陶瓷相比,硬度大幅提升。通过结合SiC_(w)、ZrB_(2)以及低温热压,实现了高硬度、高韧性Si_(3)N_(4)基陶瓷的制备,有望进一步推动其在陶瓷结构件领域的应用。Low-temperature hot pressed Si_(3)N_(4) ceramics show a greater Vickers hardness and a lower fracture toughness,while high-temperature hot pressed Si_(3)N_(4) ceramics show a lower Vickers hardness and a higher fracture toughness.To prepare Si_(3)N_(4) ceramics with a great Vickers hardness and a high fracture toughness,a low-temperature hot pressed Si_(3)N_(4) ceramic was prepared via sintering at 1500℃with 20%SiC whisker(SiC_(w),in volume fraction)and 2.5%ZrB_(2).The phase composition,relative density,microstructure and mechanical properties of low-temperature hot pressed Si_(3)N_(4) ceramic were investigated,compared with high-temperature hot pressed Si_(3)N_(4) ceramics at 1800℃.The results show that the addition of SiC_(w) inhibits the densification of Si_(3)N_(4) ceramics sintered at 1500℃,and the relative density decreases from 97.9%to 92.9%,the Vickers hardness decreases from 20.5 GPa to 16.4 GPa,and the fracture toughness increases from 2.9 MPa·m^(1/2) to 3.4 MPa·m^(1/2).However,the addition of SiC_(w) and ZrB_(2) promotes the phase transition fromα-Si_(3)N_(4) toβ-Si_(3)N_(4).The relative density of Si_(3)N_(4)-SiC_(w)-ZrB_(2) reaches 97.5%,and the Vickers hardness and fracture toughness are 20.7 GPa and 5.1 MPa·m^(1/2),respectively.Compared with low-temperature hot pressed Si_(3)N_(4) ceramic,the fracture toughness of Si_(3)N_(4)-SiC_(w)-ZrB_(2) ceramic is improved without reducing the Vickers hardness.Compared with high-temperature hot pressed Si_(3)N_(4) ceramic,the hardness is greatly improved.The Si_(3)N_(4)-based ceramic with high hardness and toughness prepared via a low-temperature hot pressing with SiC_(w) and ZrB_(2) can have a promising application in ceramic structural parts.

关 键 词:氮化硅 碳化硅晶须 硼化锆 低温热压烧结 显微结构 力学性能 

分 类 号:TQ174.75[化学工程—陶瓷工业]

 

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