摘要
研究了不同烧结温度对纳米WC-6Co复合粉烧结的影响.采用CSS-44100型万能材料实验机进行抗弯强度测试.材料的硬度通过HR-150A型洛氏硬度仪测量.分别在S-3400N型扫描电镜的背散射电子和二次电子模式下观察试样的显微组织形貌和断口形貌.结果表明:当烧结温度在1460℃时,晶粒分布均匀,材料的孔隙率最低.随烧结温度的升高,材料的抗弯强度和硬度先增加后降低.当在1460℃烧结时,较低的孔隙率和显微组织分布均匀导致材料有较高的抗弯强度.随烧结温度的继续增加,晶粒聚集长大现象严重,孔隙率增加,导致材料的抗弯强度大幅降低.当烧结温度在1460℃时,材料有较高的硬度和断裂韧性.
The effect of sintering temperature on the sintering of nano WC-6Co powder was studied.The transverse rupture strength(TRS) of the cemented carbide was tested by CSS-44100 universal material machine. The hardness(HRA) was measured by HR-150 A Rockwell hardness tester. The microstructures and fracture surface morphology were observed by S-3400 N scanning electron microscopy(SEM) in backscattered electron(BSE) mode and secondary electron(SE) mode, respectively. The results showed that when the sintering temperature was 1460℃, the grain was distributed uniformly, and the porosity was the lowest. The TRS increased firstly and then decreased with increasing of sintering temperature. The TRS was the highest sintering in 1460℃, which was resulting from the smallest porosity and homogeneous microstructure. As the sintering temperature continued to increase, the aggregation of the grain occurred, and the porosity increased, which resulted in decreasing of TRS. The hardness and fracture toughness(K1C) of the cemented carbide was higher sintering in 1460℃.
出处
《宁德师范学院学报(自然科学版)》
2016年第1期45-49,共5页
Journal of Ningde Normal University(Natural Science)
基金
福建省科技厅资助项目(2013H0036
2014H0037)
福建省龙岩市科技局资助项目(2013LY92)