Y.G. Wang
,
Z.Q. Li
,
D. Zhang
金属学报(英文版)
The interfacial microstructure of ternary-boride-based hard cladding material (YF- 2) has been studied using scanning electron microanalyser (SEM), X-ray diffraction (XRD) and energy disperse spectroscopy (EDS). Results show that there are chemical reactions and elements diffusion in the interfacial zone, which make the interface bonding well and bonding strength ideal at the interface. The results gotten by studying of crack produced by Vickers indentation technique in the interfacial zone show that it is diffcult to produce crack in the interface, the crack length in the cladding layer is longer than that to the interface, the crack which propagate to the interface stops at the interface rather than propagates along the interface. This suggests negligible residual stresses have developed because of thermal expansion mismatch. The bonding strength of the interface is 550MPa, which has been gotten by cutting test. The result gotten by analyzing the fracture surface shows that the fracture occurs at the side of cladding layer, which conrms that the bonding strength at the interface is higher than that in the cladding layer.
关键词:
ternary boride
,
null
,
null
赵丽
,
周小平
表面技术
doi:10.16490/j.cnki.issn.1001-3660.2016.09.017
目的 研究感应加热对三元硼化物Mo2FeB2陶瓷涂层的组织和性能的影响.方法 首先使用氧-乙炔火焰在45#钢表面喷涂Ni60黏性底层,然后再采用反应火焰喷涂技术在黏性底层上制备三元硼化物金属陶瓷涂层,之后利用感应电流对三元硼化物涂层进行加热处理.通过X射线衍射检测、扫描电镜观察、结合强度试验、显微硬度测试和耐磨试验,分析评价感应加热处理后三元硼化物涂层的相组成、显微组织、结合强度、硬度和耐磨性.结果 感应加热处理后,金属陶瓷涂层仍然由Mo2FeB2与基体相α-Fe组成.三元硼化物涂层和Ni60涂层的孔隙与裂纹等缺陷基本消失,Ni60涂层与基体间的孔隙也基本消失.三元硼化物涂层与基体的平均结合强度为60.48 MPa,是未经加热处理的4.6倍.三元硼化物涂层的显微硬度比未经加热处理的涂层高300HV0.1,磨损率为0.83 mg/mm2,是未经加热处理涂层的68％.结论 感应加热处理后,三元硼化物涂层的相组成与未经加热涂层的相同.感应加热处理后,三元硼化物涂层及粘结底层的组织更加致密,结合强度、显微硬度和耐磨性均显著提高.
关键词:
感应加热
,
三元硼化物
,
金属陶瓷
,
涂层
王永国
,
李兆前
,
张荻
无机材料学报
用反应液相烧结法在1280℃下真空烧结成功制备出三元硼化物基金属陶瓷(TBBC),其硬度可达92.4HRA,密度为8.2g/cm3,热膨胀系数为8.0×10-6/K.用扫描电镜、X射线衍射和能谱对其微观结构进行了分析,结果表明:此种金属陶瓷是由三元硼化物基硬质相(MoFeCrNi)3B2和铁基粘结相α-Fe组成,硬质相和铁基粘结相分散均匀,硬质相占有相当大的比重,约占体积比的80％.磨损实验表明此种金属陶瓷具有良好的耐磨性.
关键词:
三元硼化物
,
cermet
,
microstructure
