镍和铬对Mo_2FeB_2基金属陶瓷高温抗氧化性能的影响  

Effects of Ni and Cr on Resistance to High-Temperature Oxidation property of Mo_2FeB_2 Based Cermets

作　　者：李玉柱[1] 赵文广[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010

出　　处：《机械工程材料》2011年第10期91-94,共4页Materials For Mechanical Engineering

摘　　要：利用真空液相烧结技术制备了加入不同质量分数镍和铬的三元硼化物Mo2FeB2基金属陶瓷,用XRD和SEM分析了其组成和结构,用能谱仪分析了粘结相和硬质相的化学成分,并研究了其在750℃时恒温氧化增重随时间的变化。结果表明:Mo2FeB2基金属陶瓷的氧化动力学遵循抛物线规律;金属陶瓷中镍质量分数从6%增加至10%时,氧化增重逐渐变大,抗高温氧化能力恶化;金属陶瓷中添加铬后,氧化增重不明显,并且随着铬含量的增加高温抗氧化能力先降后升。Mo2 FeB2 based cermets with different contents of Ni and Cr were prepared by vacuum liquid phase sintering technology. The composition and structure of cerrnets were analyzed by means of X-ray diffracomer and scanning electron microscopy. The chemical composition of bonding phase and hard phase were analyzed by energy disperse spectroscopy. The variation of constant temperature oxidation weight gain with time was studied at 750℃. The results show that the oxidation kinetics of the Mch Fet32 based cermets obeyed the parabola rule. The oxidation weight gain increased gradually and the high-temperature oxidation resistance worsened when the content of Ni increased from 6wt% to 10wt%. After adding Cr to cermets, the oxidation weight gain was unobvious and high- temperature oxidation resistance raised a little with increase of the content of Cr.

关 键 词：三元硼化物 金属陶瓷 镍 铬 高温氧化 

分 类 号：TG146.1[一般工业技术—材料科学与工程]