微量Y和Si掺杂对MoAlB陶瓷显微组织和力学性能的影响  

Effects of trace Y and Si doping on the microstructure and mechanical properties of MoAlB ceramics

作　　者：刘亚坤 坚永鑫 孔寒冰 齐泓钧 黄国胜[2] 何培培 LIU Yakun;JIAN Yongxin;KONG Hanbing;QI Hongjun;HUANG Guosheng;HE Peipei(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266237,China;Henan SF Diamond Co.,Ltd.,Zhengzhou 450048,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室,青岛266237 [3]河南四方达超硬材料股份有限公司,郑州450048

出　　处：《粉末冶金材料科学与工程》2023年第4期329-337,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(52105208);海洋腐蚀与防护重点实验室开放研究基金项目(JJ-2021-725-02)。

摘　　要：以MoB粉、Al粉、Y粉和Si粉为原料,利用干磨和真空热压方法,制备掺杂微量Y和Si的MoAlB陶瓷块体,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)及能谱仪(EDS)等对其物相组成和显微组织进行表征,进而测试陶瓷的硬度、断裂韧性、抗弯强度及抗压强度,研究不同掺杂元素对MoAlB陶瓷显微组织和综合力学性能的影响。结果表明:MoAlB陶瓷主要由MoAlB、Al_(8)Mo_(3)和Al_(2)O_(3)相组成,掺杂微量Si和Y元素后,均有新相产生。掺杂Si元素可有效细化MoAlB晶粒,而掺杂Y元素后MoAlB晶粒尺寸略微增大。MoAlB陶瓷具有良好的抗损伤容限,掺杂Si元素有利于提高MoAlB陶瓷的硬度,而掺杂Y则会导致其硬度略微降低。掺杂Si元素有利于提高MoAlB陶瓷的断裂韧性和抗弯强度,而掺杂Y元素会略微降低陶瓷的抗弯强度和断裂韧性;掺杂Y和Si均对提高MoAlB陶瓷的抗压强度发挥积极作用,掺杂Si元素强化效果更好。MoB,Al,Y and Si powders were used as raw materials to prepare MoAlB ceramics with trace Y and Si doping by dry milling and vacuum hot pressing methods.The phase composition and microstructure of the sample were characterized and analyzed by X-Ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The hardness,fracture toughness,bending strength and compressive strength of the ceramic were tested to study the effects of different doping elements on the microstructure and comprehensive mechanical properties of MoAlB ceramics.The results show that the MoAlB ceramics are mainly composed of MoAlB,Al_(8)Mo_(3) and Al_(2)O_(3) phases,and new phases are produced after doping with trace Si and Y.The doping of Si element can effectively refine the MoAlB grains,while the MoAlB grain size slightly increases after doping with Y element.MoAlB ceramics have good tolerance to damage.The hardness of MoAlB ceramics increases by doping Si and decrease by doping Y.The fracture toughness and bending strength of MoAlB ceramics increase by doping Si,while the bending strength and fracture toughness of ceramics decrease slightly by doping Y.Both Y and Si doping have a positive effect on improving the compressive strength of MoAlB ceramics,and Si doping has a better strengthening effect.

关 键 词：MoAlB 真空热压 元素掺杂 显微组织 力学性能 

分 类 号：TF124[冶金工程—粉末冶金]