摘要
以Mn S粉体为原料,通过热压烧结方法制备Mn S陶瓷。研究了烧结温度和时间对样品相对密度、显气孔率、室温显微硬度、物相组成、微观结构以及样品变形的影响。结果表明,在不同烧结温度和保温时间条件下,Mn S陶瓷的物相均未发生改变,仍为纯相α-Mn S;但提高烧结温度或延长保温时间,Mn S烧结样品的相对密度增加、显气孔率减小、颗粒间结合越发紧密,显微硬度只有小幅改变,Mn S圆柱体陶瓷最佳烧结温度为1 255℃,保温时间为30 min。Mn S高温流变应力随应变的增加而增大,受应变速率、变形温度影响较大。
The hot compressed specimens of MnS with the size of 10 mm in diameter and 15 mm in length were prepared by hot pressed sintering with MnS powder as raw material. The relative density, apparent porosity and the Vickers hardness at room temperature were measured by the Archimedes method and the Vickers indentation method. The phase constituent of the specimens was analyzed by X-ray diffraction, and the microstructures were characterized by scanning electron microscopy. The special experimental apparatus was developed to determine the high temperature stress-strain curves of MnS on the Gleeble-3500 thermal-mechanical simulator. The results show that the phase of MnS specimens prepared at different sintering temperatures and insulation time does not change, which appears a pure phase of a-MnS. However, the relative density of MnS specimens increases, the apparent porosity decreases and the combination ability of powder improves with the increase of sintering temperature and insulation time. The MnS cylinder specimens could be prepared at optimal sintering temperature of 1 255 ℃ and insulation time of 30 min. The high-temperature flow stress of MnS, which is affected by strain rate and sintering temperature, increases with the increase of strain.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第9期1271-1276,共6页
Journal of The Chinese Ceramic Society
基金
河北省高等学校创新团队领军人才培育计划(LJRC012)资助
关键词
硫化锰
热压烧结
烧结条件
热变形
应力应变曲线
manganese sulfide
hot pressed sintering
sintering conditions
hot deformation
stress-strain curve
